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storage-ring

       
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MOPCH004 Coherent Harmonic Generation Experiment on UVSOR-II Storage Ring laser, electron, undulator, klystron 50
 
  • M. Labat
    CEA, Gif-sur-Yvette
  • M.-E. Couprie
    SOLEIL, Gif-sur-Yvette
  • T. Hara
    RIKEN Spring-8 Harima, Hyogo
  • M. Hosaka, M. Katoh, A. Mochihashi, M. Shimada, J. Yamazaki
    UVSOR, Okazaki
  • G. Lambert
    RIKEN Spring-8, Hyogo
  • D. Nutarelli
    LAC, Orsay
  • Y. Takashima
    Nagoya University, Nagoya
  Harmonic Generation schemes on Free Electron Laser devices are very promising. The injection of a traditional laser source inside the first undulator leads to an efficient energy modulation of the electron bunch, and therefore, its spatial modulation, resulting in a more coherent light emission along the second undulator. Experiments have been performed on the UVSOR-II Storage Ring at Okazaki (Japan) with electrons stored at an energy of 600 MeV, and using a 2.5 mJ Ti:Sa laser at 800 nm wavelength, 1 kHz repetition rate, and 100 fs up to 2 ps pulse duration. The experimental setup is presented, including the transport alignment and synchronisation between the laser and the electron beam. The third harmonic at 266 nm has been characterised versus various parameters: current, RF cavity voltage, undulator gap, magnetic functions of the storage ring, and laser pulse duration. Those results are compared with theory via analytical models and simulations.  
 
MOPCH018 Macro-Pulse Generation in a Storage-Ring Free-Electron Laser: A Single-Particle Plus FEL Numerical Approach FEL, electron, simulation, ELETTRA 89
 
  • F. Curbis, E. Allaria, G. De Ninno
    ELETTRA, Basovizza, Trieste
  In a storage-ring free-electron laser (FEL), the onset and growth of intra-cavity power at the fundamental resonant wavelength is naturally accompanied by coherent emission at higher harmonics. Contrary to what happens in single-pass linac-based devices, the electron beam is re-circulated in the storage ring and the microbunching becomes thermalized. As a consequence, a correct theoretical understanding of the process requires a proper modelling of the turn-by-turn evolution of the electron-beam phase space, both inside the undulators (where the FEL interaction takes place) and along the ring. To simulate this process we have coupled an ad hoc modified version of the 3D numerical code Ginger (which models the FEL interaction) together with a linear one-turn map (which propagates the electron beam along the ring). We present our results and draw a comparison with previous simplified approaches. We also present the first benchmarking of experiments carried out with the ELETTRA storage-ring FEL.  
 
MOPCH053 Towards Sub-picoseconds Electron Bunches: Upgrading Ideas for BESSY II optics, radiation, electron, focusing 157
 
  • G. Wuestefeld, J. Feikes, P. Kuske
    BESSY GmbH, Berlin
  Sub-picoseconds bunches were achieved with the BESSY low alpha optics, and their lengths were measured using Fourier Transform spectroscopy*. To avoid the coherent synchrotron radiation instability, the current in these short bunches has to be limited to theμampere level. An upgrade of the BESSY II rf gradient to much larger values is suggested to overcome this low current limitation by two orders of magnitude. Intense, picoseconds long bunches could then be achieved already at the regular user optics. The resulting short and very intense electron bunches are useful for generation of short x-ray pulses and powerful THz-radiation. Expected parameters of bunch length and current are discussed.

*J. Feikes et al. "Sub-Picoseconds Electron Bunches in the BESSY Storage Ring", EPAC'04, Luzerne (Switzerland), July 2004.

 
 
MOPCH054 Plans for the Generation of Short Radiation Pulses at the Diamond Storage Ring DIAMOND, radiation, optics, synchrotron 160
 
  • R. Bartolini
    Diamond, Oxfordshire
  • M. Borland, K.C. Harkay
    ANL, Argonne, Illinois
  Diamond is a third generation light source under commissioning in Oxfordshire UK. In view of the increasing interest in the production of short radiation pulses, we have investigated the possibility to operate with a low-alpha optics, the use of a third harmonic cavity for bunch shortening and the implementation of a crab cavity scheme in the Diamond storage ring. The results of the initial accelerator studies will be described, including the modification of the beam optics, non-linear beam dynamics optimisation and choice of RF parameters for the crab cavity operation. The expected performance of these schemes will be summarised.  
 
MOPCH055 Circulation of a Short, Intense Electron Bunch in the NewSUBARU Storage Ring linac, injection, CSR, radiation 163
 
  • Y. Shoji, Y. Hisaoka, T. Matsubara, T. Mitsui
    NewSUBARU/SPring-8, Laboratory of Advanced Science and Technology for Industry (LASTI), Hyogo
  • T. Asaka, S. Suzuki
    JASRI/SPring-8, Hyogo-ken
  One new method is proposed which supplies synchrotron radiation light from a short and intense electron bunch. This method supplies a short and intense x-ray pulse and extremely strong coherent radiation in a long wavelength region to beam lines of a storage ring. SPring-8 linac supplied a short and intense 1.0 GeV electron beam to NewSUBARU storage ring. The electron bunch was compressed to 10ps (full width) from the normal condition (20ps full width) using ECS system. The pulse charge was 0.10nC/bunch and the energy spread was (±) 0.2 % (full width) at the injection point. The ring lattice was adjusted at a quasi-isochronous condition to keep the short bunch for many revolutions. The estimated linear and non-linear momentum compaction factors were -6·10-5 (the linear factor), 0.0 (the second order factor) and +0.9 (the third order factor). The bunch length was measured by a streak camera, and the coherent radiation was detected by a Shottky diode detector. The short bunch was successfully circulated for about 50 turns.  
 
MOPCH075 Internal Target Effects in the ESR Storage Ring with Cooling target, electron, simulation, ion 202
 
  • V. Gostishchev, K. Beckert, P. Beller, C. Dimopoulou, A. Dolinskii, F. Nolden, M. Steck
    GSI, Darmstadt
  • I.N. Meshkov, A.O. Sidorin, A.V. Smirnov, G.V. Trubnikov
    JINR, Dubna, Moscow Region
  The accurate description of beam-target effects is important for the prediction of operation conditions in terms of high luminosity and beam quality in the FAIR facility at GSI. Numerical models have been developed to evaluate beam dynamics in ion storage rings, where strong cooling in combination with a dense target is applied. First systematic benchmarking experiments were carried out at the existing ESR storage ring at GSI. The influence of the internal target on the beam parameters is demonstrated. Comparison of experimental results with simple models describing the energy loss of the beam particles in the target as well as with more sophisticated simulations with the BETACOOL code will be given.  
 
MOPCH076 Baseline Design for the Facility for Antiproton and Ion Research (FAIR) Finalized antiproton, ion, GSI, synchrotron 205
 
  • D. Krämer
    GSI, Darmstadt
  The baseline design for the future international facility FAIR has been worked out. The unique accelerator complex will provide high intensity ion beams ranging from antiprotons to uranium for nuclear matter and hadron physics studies. Radioactive beams are generated for nuclear structure and astrophysics experiments. Phase space compression utilizing stochastic and electron cooling allow for fundamental tests at highest precision. Centered around two fast ramping superconducting synchrotrons, ions are accelerated to a beam rigidity of up to 100 Tm and 300 Tm, respectively. Two dedicated storage rings serve for beam accumulation and cooling, providing unprecedented beam quality for experiments in the NESR and HESR storage rings. An overview of the layout of the accelerator complex and beam delivery systems is given. Ongoing R&D activities are reported; project status and international participation will be presented.  
 
MOPCH080 Design of the NESR Storage Ring for Operation with Ions and Antiprotons electron, ion, antiproton, injection 217
 
  • M. Steck, K. Beckert, P. Beller, C. Dimopoulou, A. Dolinskii, F. Nolden, J. Yang
    GSI, Darmstadt
  The New Experimental Storage Ring (NESR) of the FAIR project has two major modes of operation. These are storage of heavy ion beams for internal experiments and deceleration of highly charged ions and antiprotons before transfer into a low energy experimental area. The heavy ion beams can be either stable highly charged ions or rare isotope beams at an energy of 740 MeV/u selected in a magnetic separator. The antiprotons come with an energy of 3 GeV from the production target, they are pre-cooled and accumulated in a storage ring complex. The magnetic structure of the NESR has been optimized for large transverse and longitudinal acceptance by detailed dynamic aperture calculations. This will allow storage of multi-component beams with a large spread of charge to mass ratio, corresponding to a large spread in magnetic rigidity. Highest phase space density of the stored beams is provided by an electron cooling system, which for ions covers the full energy range and for antiprotons allows intermediate cooling during the deceleration process. For experiments with short-lived isotopes the cooling time and the time of deceleration will be optimized to a few seconds.  
 
MOPCH081 FLAIR: a Facility for Low-energy Antiproton and Ion Research antiproton, ion, emittance, CERN 220
 
  • C.P. Welsch, C.P. Welsch
    CERN, Geneva
  • H. Danared
    MSL, Stockholm
  To exploit the unique possibilities that will become available at the Facility for Antiproton and Ion Research (FAIR), a collaboration of about 50 institutes from 15 countries was formed to efficiently enable an innovative research program towards low-energy antimatter-physics. In the Facility for Low-energy Antiproton and Ion Research (FLAIR) antiprotons and heavy ions are slowed down from 30 MeV to energies as low as 20 keV by a magnetic and an electrostatic storage ring. In this contribution, the facility and the research program covered are described with an emphasis on the accelerator chain and the expected particle numbers. An overview of the novel beam handling, cooling and imaging techniques as they will be required across the facility is given.  
 
MOPCH093 Design of the Double Electrostatic Storage Ring DESIREE ion, vacuum, cryogenics, simulation 252
 
  • P. Löfgren, G. Andler, L. Bagge, M. Blom, H. Danared, A. Källberg, S. Leontein, L. Liljeby, A. Paal, K.-G. Rensfelt, A. Simonsson
    MSL, Stockholm
  • H. Cederquist, M. Larsson, S. Rosén, H.T. Schmidt, K. Schmidt
    FYSIKUM, AlbaNova, Stockholm University, Stockholm
  A double electrostatic storage ring named DESIREE is under construction at the Manne Siegbahn Laboratory and Stockholm University. The two rings will have the same circumference, 9.2 m, and a common straight section where merged beam experiments with ions of opposite signs will be performed. The whole structure will be contained in a single vacuum vessel resulting in a very compact design. In addition to its unique double ring structure it will be possible to cool DESIREE down to 10-20K using cryogenerators. This will reduce the internal vibrational and rotational excitations of stored molecules. A cold system will also result in excellent vacuum conditions where longer lifetimes of the stored beams can be expected. While the ion optical calculations have entered a final phase much of the work is now devoted to solve many of the mechanical and cryogenic challenges of DESIREE. In order to test the mechanical and cryogenic properties of for example insulators, vacuum seals, and laser viewports a small test system has been built. The test system is expected to provide valuable information for the final design of DESIREE.  
 
MOPCH164 Status of the Diamond Storage Ring Radio Frequency System DIAMOND, controls, pick-up, power-supply 445
 
  • M. Jensen, M. Maddock, S.A. Pande, S. Rains, A. F. Rankin, D. Spink, A.V. Watkins
    Diamond, Oxfordshire
  • J. Alex, M. Mueller
    Thomson Broadcast & Multimedia AG, Turgi
  • B. A. Aminov
    CRE, Wuppertal
  • M. Pekeler
    ACCEL, Bergisch Gladbach
  The installation and commissioning of the Diamond Storage Ring RF system is nearing completion. Diamond will initially operate with two RF high power amplifiers and two cavities. The key components in each RF system are a 300 kW amplifier implemented through the combination of four 80 kW IOTs, a 500 MHz superconducting cavity providing up to 2 MV of accelerating voltage and an advanced analogue IQ Low Level RF (LLRF) system to control the cavity frequency, voltage and phase. We present here an update on the recent installation and early commissioning results of the RF systems.  
 
MOPCH192 Operation of a Helium Cryogenic System for a Superconducting Cavity in an Electron Storage Ring cryogenics, controls, superconducting-magnet, electron 511
 
  • F. Z. Hsiao, S.-H. Chang, W.-S. Chiou, H.C. Li
    NSRRC, Hsinchu
  A 500 MHz superconducting cavity maintaining the energy of electrons in the storage ring of TLS light source started from the year 2005. A helium system dedicated to keep the niobium cavity at 4.5 K has begun its operation since the year 2003. The cryogenic system provides maximum refrigeration of 469 W or liquefaction rate of 134 l/hr. The constraint from the superconducting cavity leads to specific features of the cryogenic system. This paper presents the operation of the cryogenic system as the superconducting cavity at different conditions. The interaction in between the cryogenic system and the superconducting cavity and the constraints on the starting and shutdown of the cryogenic system are indicated.  
 
MOPCH196 Diamond Storage Ring Remote Alignment System alignment, survey, controls, DIAMOND 523
 
  • I.P.S. Martin, A.I. Bell, A. Gonias, N.P. Hammond, J. Kay, D. Wilson
    Diamond, Oxfordshire
  The 24 cell Diamond Storage Ring is 561.6m in circumference and is mounted on 72 support girders, the largest of which are 6m long and weigh 17 Tonnes. Each girder can be remotely positioned in 5 axes using a system of motorised cams. This system has been designed to enable the future remote realignment of the Storage Ring using beam based alignment techniques. The system is described in detail including the mechanical and electrical components of the system as well as a description of the alignment algorithms employed and how these have been incorporated into the control system.  
 
MOPLS042 Longitudinal Beam Stability for CESR-c feedback, luminosity, positron, synchrotron 634
 
  • R. Holtzapple, J.S. Kern, P.J.S. Stonaha
    Alfred University, Alfred, New York
  • B. Cerio
    Colgate University, Hamilton, New York
  • M.A. Palmer
    Cornell University, Laboratory for Elementary-Particle Physics, Ithaca, New York
  The Cornell Electron-Positron Storage Ring (CESR) operates at 1.9 GeV per beam for high energy physics collisions. To maintain high luminosity it is essential for the bunch trains to be longitudinally stable. Measurements of longitudinal stability with a single, multiple, and colliding trains have been performed using a dual sweep streak camera and are presented in this paper.  
 
TUOAFI03 Production of MeV Photons by the Laser Compton Scattering Using a Far Infrared Laser at SPring-8 laser, FIR, photon, electron 961
 
  • H. Ohkuma, M. Shoji, S. Suzuki, K. Tamura, T. Yorita
    JASRI/SPring-8, Hyogo-ken
  • Y. Arimoto
    Osaka University, Osaka
  • M. Fujiwara, K. Kawase
    RCNP, Osaka
  • K. Nakayama, S. Okajima
    Chubu University, Kasugai, Aichi
  In order to produce MeV gamma-ray by the Laser Compton scattering (LCS), a high power optically pumped Far Infrared (FIR) laser has been developed at SPring-8. In the case of the SPring-8 storage ring, the momentum acceptance is so large (± 200 MeV) that the scattered electron is re-accelerated, then the stored beam is not lost by the LCS process. The beam diagnostics beamline is used to inject a FIR laser beam against 8-GeV stored electron beam and to extract MeV gamma-ray produced by LCS. The FIR laser system, gamma-ray production system, and measured gamma-ray spectrum will be presented. Future plans will also be introduced. In order to produce higher intense gamma-ray, we are constructing new gamma-ray production system at another beamline.  
slides icon Transparencies
 
TUOBFI01 A Diagnostic Kicker System as a Versatile Tool for Storage Ring Characterisations kicker, diagnostics, controls, synchrotron 974
 
  • O. Dressler, J. Feikes, J. Kolbe
    BESSY GmbH, Berlin
  For the BESSY II Synchrotron Light Source two diagnostic kicker systems including current pulsers were developed, allowing vertical and horizontal deflection of the stored beam. Synchronised with the revolution trigger, simultaneous pulsing of the systems kicks the stored beam in any transverse direction with a repetition rate of up to 10 Hz allowing a wide range of storage ring investigations. Examples are dynamic aperture measurements and frequency map measurements. Special efforts were made to assure the demands of high amplitude and time stability for this kind of experiments. The technical concept of the systems and the controlling of the measurements are described.  
slides icon Transparencies
 
TUPCH003 Diagnostics and Timing at the Australian Synchrotron diagnostics, injection, synchrotron, kicker 995
 
  • M.J. Spencer, S. Banks, M.J. Boland, M. Clift, R.T. Dowd, R. Farnsworth, S. Hunt, G. LeBlanc, M. Mallis, B. Mountford, Y.E. Tan, A. Walsh, K. Zingre
    ASP, Clayton, Victoria
  The 3GeV Australian Synchrotron will begin operation in March 2007. This paper outlines the storage ring diagnostics systems and the injection timing system. The diagnostics system includes an optical beamline with streak camera, an x-ray beamline with pinhole array, a diagnostic straight with fast feedback kicker, stripline, direct current current transformer, and a four-fingered scraper. Over the 14 sectors there are 98 beam position monitors and 14 movable beam loss monitors. The timing system is based on a static injection system with the storage ring bucket to be filled targeted by delaying the firing of the electron gun.  
 
TUPCH008 Behavior of the BPM System During the First Weeks of SOLEIL Commissioning SOLEIL, instrumentation, electron, synchrotron 1007
 
  • J.-C. Denard, L. Cassinari, N. Hubert, N.L. Leclercq, D. Pedeau
    SOLEIL, Gif-sur-Yvette
  SOLEIL, a new synchrotron light source built near Paris in France, is pioneering a new high resolution electron Beam Position Monitor (BPM) system to achieve stability of the beams at the micron level, as required for the beamlines. The same BPM system allows also measurement of the beam position in turn-by-turn mode for various machine physics studies. The system combines the high stability characteristic of multiplexed input channels and the flexibility of a digital system. Instrumentation Technologies developed the Libera module upon SOLEIL proposals and requirements. The performances of the system evaluated after the Booster and the storage ring commissioning will be presented.  
 
TUPCH018 Fast Beam Dynamics Investigation Based on an ADC Filling Pattern Measurement CBM, synchrotron, controls, diagnostics 1034
 
  • J. Kettler, P. Hartmann, R.G. Heine, T. Weis
    DELTA, Dortmund
  A diagnostic tool to determine the longitudinal particle filling pattern has been installed at the 1.5 GeV electron storage ring DELTA. The instrument is PC-based using an ADC-conversion at a sampling rate of 2 GS/s and a nominal bandwidth of 1 GHz which is applied to the sumsignal of a single storage ring beam position monitor. By sampling over successive turns the resolution is enhanced by one order of magnitude allowing an easy access to the longitudinal particle distribution inside the ring. The data obtained turn-by-turn over hundreds of revolutions can be further analysed by FFT-techniques allowing a very fast detection (~ 1 s) of longitudinal coupled bunch mode (CBM) instabilities from the phase modulated spectrum. The application of the FFT to the amplitude modulated particle distribution moreover allows a "post mortem"-investigation of CBM induced beam loss. The paper will present the layout of the diagnostic system and will report on filling pattern measurements as well as on investigations of longitudinal CBM-instabilities.  
 
TUPCH044 Turn-by-turn Data Acquisition and Post-processing for the Diamond Booster and Storage Ring booster, betatron, DIAMOND, injection 1103
 
  • R. Bartolini, M.G. Abbott, I.P.S. Martin, G. Rehm, J.H. Rowland
    Diamond, Oxfordshire
  The Diamond booster and storage ring are equipped with Libera Electron Beam Position Processors with turn-by-turn capabilities. We describe here the turn-by-turn data acquisition system and the software used for post-processing the beam data. The signals from the Libera boxes are acquired and controlled with EPICS and then transferred to the MATLAB environment via the MATLAB Channel Access. Here they are post-processed using MATLAB capabilities and dedicated software linked to MATLAB. Examples of data acquired and measurements performed during Diamond booster and storage ring commissioning are reported.  
 
TUPCH045 First Use of Current and Charge Measurement Systems in the Commissioning of Diamond booster, linac, DIAMOND, injection 1106
 
  • A.F.D. Morgan, M.G. Abbott, G. Rehm
    Diamond, Oxfordshire
  This paper will discuss the results obtained from the charge and current measurement systems installed in Diamond during the commissioning stage of operation. The charge measurements are gathered from integrating current transformers and Faraday cups, while the current is measured using a DC current transformer in each ring. The measured beam parameters will be investigated, as well as how well the devices performed against expectations.  
 
TUPCH046 Performance of Global Diagnostics Systems during the Commissioning of Diamond booster, DIAMOND, injection, controls 1109
 
  • G. Rehm, M.G. Abbott
    Diamond, Oxfordshire
  This paper summarises data acquired with beam diagnostics systems distributed globally through Diamond's Linac, transfer paths, booster and storage ring. It shows results from the electron beam position monitors using their capabilities to monitor transient events, the booster ramp as well as stored beam. The performance derived from real beam measurements is compared to measurements obtained in the lab using signal and pulse generators. Other systems of widespread use are screens and synchrotron light monitors. Their performance and control system integration based on IEEE1394 camera technology is presented. Finally, first results from the fast and slow beam loss monitoring systems are described.  
 
TUPCH047 Diamond Optical Diagnostics: First Streak Camera Measurements injection, electron, synchrotron, DIAMOND 1112
 
  • C.A. Thomas, G. Rehm
    Diamond, Oxfordshire
  We present in this paper a first set of measurements of the six-dimensional phase-space of the electron beam in the Diamond storage ring. We recall the predicted performance and compare it with our first measurements. The two pinhole cameras measure the beam size, from which we retrieve the energy spread and the emittance of the beam in both horizontal and vertical directions. We have designed a robust and simple UV-visible beamline, to measure the electron bunch profile and length with a streak camera, and to measure the beam quality using a state-of-the-art single photon counting technique.  
 
TUPCH054 Upgrade of Signal Processing of the BPM System at the SPring-8 Storage Ring target, pick-up, synchrotron, acceleration 1130
 
  • T. Fujita, S. Sasaki, M. Shoji, T. Takashima
    JASRI/SPring-8, Hyogo-ken
  SPring-8 is a third generation synchrotron light source, which is operated stably with top-up mode and with optics of low emittance mode. Along with stabilization of electron beam orbit in the ring, upgrading of the BPM system has also been required. We have developed a new signal processing circuit for COD measurement with a target of a few microns of position resolution at 1 kHz band-width and a few hundreds per second to take beam position of all BPMs. In the new circuit, a multiplexing method is employed and the IF frequency is directory detected with a 2MSPS 16-bit ADC. The digitized signal is processed with DSP to obtain beam position. Analog components of the circuit are equipped in a temperature controlled cabinet in order not to be affected by fluctuation of ambient temperature. In this paper we report schematics and performance of the new circuit, e.g., dependence of position resolution on measurement band-width and long time stability, etc. In addition, we briefly describe possibility of fast orbit measurement as a further application of the circuit.  
 
TUPCH078 BPM Design for the ALBA Synchrotron impedance, booster, vacuum, pick-up 1190
 
  • F. Pérez, A. Olmos
    ALBA, Bellaterra
  • T.F. Günzel
    ESRF, Grenoble
  ALBA is a 3 GeV, low emittance, 3rd generation synchrotron light source that is in the construction phase in Cerdanyola, Spain. Vertical beam sizes down to a few microns will require beam stabilities on the submicron level. The BPM has to be designed in order to provide reliable and accurate beam position readings. Simulation and computational codes have been used to optimise, for a given vacuum chamber dimension, the BPM design. The optimisation has taken into account the usual sensitivity and intrinsic resolution parameters, but as well, the wakefield loss factor of the buttons. Due to the small vertical vacuum chamber dimension and the high design current, the beam power deposited in the buttons is becoming a concern due to the thermal deformation effects that can introduce errors at the submicron level. A compromise between a higher intrinsic resolution from one side, and a low power deposited by the beam in the buttons from the other, define the final buttons dimensions.  
 
TUPCH094 THz Diagnostic for the Femtosecond Bunch Slicing Project at the Swiss Light Source electron, SLS, laser, CSR 1229
 
  • V. Schlott, D. Abramsohn, P. Beaud, G. Ingold, P. Lerch
    PSI, Villigen
  Interaction of electron bunches with a femtosecond Ti:Sa laser beam along a modulator wiggler in the Swiss Light Source (SLS) storage ring results in an energy modulation of the electron beam on the length scale of the laser pulse. While high energy photon pulses (3 18 keV, ~ 100 fs long) are produced by an in-vacuum undulator (radiator) and used for time resolved experiments within the SLS femtosecond bunch slicing project, coherent synchrotron radiation (CSR) emitted by the adjacent bending magnet in the THz-regime is used for longitudinal slicing diagnostics and monitoring of slicing efficiency. This paper describes the simulation and layout of the THz-diagnostic beamline and presents first time and spectrally resolved measurements with the longitudinal slicing diagnostics, which has been set-up for the SLS “femto-slicing” project.  
 
TUPCH109 Ion-related Phenomenon in UVSOR/UVSOR-II Electron Storage Ring ion, vacuum, single-bunch, electron 1265
 
  • A. Mochihashi, K. Hayashi, M. Hosaka, M. Katoh, J. Yamazaki
    UVSOR, Okazaki
  • Y. Hori
    KEK, Ibaraki
  • Y. Takashima
    Nagoya University, Nagoya
  A vertical betatron tune shift depending on beam current under multibunch condition was observed in the UVSOR storage ring. Vertical tune increased as beam current decreased, and the slope of the tune shift depended on the condition of the vacuum in the ring. Such a change in vertical tune was explained by a change in the stability condition of trapped ions*/** with the beam current. Based on a theoretical model*** that gives density of the trapped ions the experimental results were discussed via analytic and tracking calculations. Both the effect from the residual gas ions generated by scattering between high energy electrons and molecules and that from dissociated ions that come from secondary ionization processes have been discussed. In quest of the ion-related phenomenon in single-bunch condition, precise tune measurement has been also performed in the UVSOR-II storage ring. The experimental results in the single-bunch condition have been discussed. Precise measurement of vacuum pressure in the beam duct is a key issue of the ion-related phenomenon. A design of vacuum pressure measurement system via detecting residual gas fluorescence will be introduced in the presentation.

*R. D. Kohaupt. DESY Internal. Bericht No.H1-71/2 (1971). **Y. Baconnier and G. Brianti. CERN Internal Report No.CERN/SPS/80-2(DI) (1980). ***A. Mochihashi et al. Jpn. J. Appl. Phys. 44 (2005) 430.

 
 
TUPCH110 Upgrade of Main RF Cavity in UVSOR-II Electron Storage Ring electron, optics, controls, vacuum 1268
 
  • A. Mochihashi, K. Hayashi, M. Hosaka, M. Katoh, J. Yamazaki
    UVSOR, Okazaki
  • H. Suzuki
    Toshiba, Yokohama
  • Y. Takashima
    Nagoya University, Nagoya
  The UVSOR electron storage ring, which is dedicated to a synchrotron radiation (SR) light source especially for VUV and Soft X-ray, has been improved at the beginning of 2003, and transverse emittance in the improved ring (UVSOR-II)* has been decreased from 165nm-rad to 60 and/or 27nm-rad. Users runs have been performed since September 2003 with 60nm-rad mode, and since then high brilliant SR beams have been supplied routinely for users. The 27nm-rad mode, however, was difficult to introduce to daily operation initially because Touschek lifetime was insufficient in such small emittance condition. To improve the beam lifetime and make full use of the SR beams, we have built new main RF cavity. The aim of the improvement was to increase momentum acceptance by increasing RF accelerating voltage; the previous cavity generated the voltage of 55kV, whereas the new one can generate 150kV in maximum without changing RF frequency (90.1MHz) and transmitter (20kW in maximum). The new cavity has been installed in the UVSOR-II in spring of 2005, and high power commissioning went on smoothly. Because of the improvement, from spring 2005 the UVSOR-II has switched the daily users run to 27nm-rad.

*M. Katoh et al., in this conference.

 
 
TUPCH129 Conceptual Design of a 3rd Harmonic Cavity System for the LNLS Electron Storage Ring electron, damping, synchrotron, CBM 1316
 
  • N.P. Abreu, O.R. Bagnato, R.H.A. Farias, M.J. Ferreira, C. Pardine, P.F. Tavares
    LNLS, Campinas
  The installation of a second RF cavity in the UVX electron storage ring at the Brazilian Synchrotron Light Laboratory (LNLS) at the end of 2003 brought about longitudinal instabilities driven by one of the HOMs of the new cavity. Even though the operational difficulties related to these unstable modes were successfully overcome by means of a combination of cavity tuning (using temperature and plunger adjustments) with phase modulation of the RF fields at the second harmonic of the synchrotron frequency, a more appropriate technique to avoid those problems is the use of higher harmonic cavities, which have the important advantage of providing damping of the longitudinal modes without increasing the energy spread, i.e., without compromising the longitudinal emittance. In this work we present the design of a passive higher harmonic cavity system optimized for operation at the LNLS storage ring. The parameters for a set of cavities as well as the analysis of some of the effects that they may introduce in the beam dynamics are presented. An overview of the technical aspects related to the project, construction and installation of the cavities in the storage ring is also presented.  
 
TUPCH132 Higher Order Mode (HOM) Damper of 500 MHz Damped Cavity for ASP Storage Ring coupling, insertion, synchrotron, damping 1325
 
  • J. Watanabe, K. Nakayama, K. Sato, H. Suzuki
    Toshiba, Yokohama
  • M. Izawa
    KEK, Ibaraki
  • A. Jackson, G. LeBlanc, K. Zingre
    ASP, Clayton, Victoria
  • T. Koseki
    RIKEN/RARF/CC, Saitama
  • N. Nakamura, H. Sakai, H. Takaki
    ISSP/SRL, Chiba
  TOSHIBA has delivered the storage ring RF system for the Australian Synchrotron Project(ASP). Two pairs of the 500MHz Higher Order Mode(HOM) damped cavities were applied for this system. Two on-centered and one off-centered dampers were attached for damping the longitudinal HOM impedance down to less than 20kOhm/GHz. In order to reduce the coupling of off-center damper for accelerating mode and improve cooling power of damper, New HOM damper was designed by optimizing SiC absorber structure and damper antenna length using HFSS code. The design and manufacture of the new HOM damper and the test are described.  
 
TUPCH141 New Developments for the RF System of the ALBA Storage Ring simulation, synchrotron, insertion, klystron 1346
 
  • F. Pérez, B. B. Baricevic, D. Einfeld, H. Hassanzadegan, A. Salom, P. Sanchez
    ALBA, Bellaterra
  ALBA is a 3 GeV, 400 mA, 3rd generation Synchrotron Light Source that is in the construction phase in Cerdanyola, Spain. The RF System will have to provide 3.6 MV of accelerating voltage and restore up to 540 kW of power to the electron beam. For that six RF plants, working at 500 MHz, are foreseen. The RF plants will include several new developments: 1) DAMPY cavity: the normal conducting HOM damped cavity developed by BESSY and based in the EU design; six will be installed. 2) CaCo: A cavity combiner to add the power to two 80 kW IOTs to produce the 160 kW needed for each cavity. 3) WATRAX: A waveguide transition to coaxial, specially designed to feed the DAMPY cavities due to the geometrical and cooling constrains. 4) IQ LLRF: The low level RF will be based on the IQ modulation/demodulation technique, both analogue and digital approach are being pursued. This paper describes the Storage Ring RF System and reports about the status of these new developments.  
 
TUPCH171 Calculation, Measurement and Analysis of Vacuum Pressure Data and Related Bremsstrahlung Levels on Straight Sections of the ESRF vacuum, ESRF, radiation, optics 1417
 
  • R. Kersevan, P. Berkvens, P. Colomp
    ESRF, Grenoble
  One of the major personal safety issues of modern synchrotron radiation (SR) light sources is the minimization of the exposure of beamline staff and users to high-energy bremsstrahlung (BS) radiation generated in the straight sections of the storage ring and entering the optics hutches of the beamlines. This is particularly important when insertion device (ID) narrow-gap chambers are installed, nowadays characterized by very low specific conductances. At the ESRF, this has led to the implementation of systematic measurements of BS levels and vacuum conditioning curves, in conjunction with the installation of non-evaporable getter (NEG)-coated ID chambers. A dedicated beamline is used to do on-axis measurements of the BS intensity during the initial conditioning period of newly installed NEG-coated ID chambers. This paper will show results of measurements and calculations performed throughout the years, and comment on the suitability from the radiation safety point of view of the installation of NEG-coated chambers in large numbers around the ring.  
 
TUPLS002 Dust Macroparticles in HERA and DORIS electron, vacuum, radiation, simulation 1486
 
  • A. Kling
    DESY, Hamburg
  Charged dust macroparticles are considered as sources of sudden beam lifetime breakdowns detected in many electron storage rings. This phenomenon is still observed in HERA, although the distributed ion pumps, which were previously identified as dust particle sources, have been removed. We report on the observations of trapped dust during the last period of electron operation and present a detailed model of dust macroparticle dynamics in the HERA e-ring and in DORIS with particular emphasis on stability and possible trapping processes.  
 
TUPLS004 How Einsteinian Tide Force Affects Beam in a Storage Ring KEK 1492
 
  • D. Dong
    IHEP Beijing, Beijing
  In this paper, we will introduce Einsteinian tide force into a storage ring, and discuss the beam characteristic in a storage ring, we can see that it is quite different from Newtonian tide force act on beam in a storage ring which we know very well. We also discuss the method to measure the beam instability in storage ring caused by these two different tide forces.  
 
TUPLS029 Optical Scheme of an Electrostatic Storage Ring quadrupole, lattice, simulation, ion 1553
 
  • V. Aleksandrov, Yu. Kazarinov, V. Shevtsov
    JINR, Dubna, Moscow Region
  • R. Doerner, H. Schmidt-Boecking, K.E. Stiebing
    IKF, Frankfurt-am-Main
  • A. Schempp
    IAP, Frankfurt-am-Main
  We consider the optical scheme of an electrostatic storage ring for low energy heavy ions/molecules* with special requirements to type of optical functions. Results of calculation are presented.

*C. P. Welsch et al. Proc. of PAC’03, 12-16 May 2003, Portland, Oregon, USA, p.1622.

 
 
TUPLS062 Cooling Rates at Ultra-low Energy Storage Rings electron, ion, simulation, antiproton 1633
 
  • C.P. Welsch, C.P. Welsch
    CERN, Geneva
  • A.V. Smirnov
    JINR, Dubna, Moscow Region
  Electrostatic low-energy storage rings have proven to be a highly flexible tool, able to cover experiments from a variety of different fields ranging from atomic, nuclear and molecular physics to biology and chemistry. Future machines will decisively rely on efficient electron cooling down to electron energies as low as some eV, posing new challenges to the cooler layout and operation. The BETACOOL code has already been successfully applied for the layout and optimization of a number of different electron coolers around the world. In this contribution, the results from calculations of the cooling rates at future low-energy machines equipped with an internal target like the Ultra-low energy Storage Ring (USR) at the Facility for Low-energy Antiproton and Ion Research (FLAIR) are presented.  
 
TUPLS063 Layout of the USR at FLAIR ion, electron, antiproton, positron 1636
 
  • C.P. Welsch, C.P. Welsch
    CERN, Geneva
  • M. Grieser, J. Ullrich, A. Wolf
    MPI-K, Heidelberg
  The Facility for Low-energy Antiproton and Ion Research (FLAIR) and a large part of the wide physics program decisively rely on new experimental techniques to cool and slow down antiprotons to 20 keV, namely on the development of an ultra-low energy electrostatic storage ring (USR). The whole research program connected with anti-matter/matter interactions is only feasible if such a machine will be realized For the USR to fulfil its key role in the FLAIR project, the development of novel and challenging methods and technologies is necessary: the combination of the electrostatic storage mode with a deceleration of the stored ions from 300 keV to 20 keV, electron cooling at all energies in both longitudinal and transverse phase-space, bunching of the stored beam to ultra-short pulses in the nanosecond regime and the development of an in-ring reaction microscope for antiproton-matter rearrangement experiments. In this contribution, the layout and the expected beam parameters of the USR are presented and its role within FLAIR described. The machine lattice and the cooler parameters are summarized.  
 
TUPLS077 Development of FFAG-ERIT Ring target, proton, emittance, simulation 1675
 
  • K. Okabe, M. Muto
    KEK, Ibaraki
  • Y. Mori
    KURRI, Osaka
  An intense neutron source with the emittance recovery internal target (ERIT) using the FFAG accelerator is under development. The design of the FFAG storage ring for this purpose will be presented.  
 
TUPLS136 Air Temperature Analysis and Improvement for the Technical Zone at TLS controls, vacuum, simulation, power-supply 1825
 
  • J.-C. Chang, J.-R. Chen, Z.-D. Tsai
    NSRRC, Hsinchu
  • M. Ke
    NTUT, Taipei
  This paper presents the air temperature analysis and control improvement for the technical zone, where many critical instrumentations of power supply, rf, vacuum and control apparatuses are located, at the Taiwan Light Source (TLS). The technical zone with circular shape is located on the core area of the storage ring. The diameter and height of the technical zone are 28.5m and 3m, respectively. Totally 13 temperature sensors are installed in this zone to online record the air temperature history. Because of insufficient cooling capacity and poor air circulation of the air-conditioning (A/C) system, the air temperature may reach to 30 degrees C, and spatial air temperature difference may be more than 7 degrees C. To cope with those problems, a computational fluid dynamics (CFD) code is applied to simulate the spatial temperature distribution. The A/C cooling capacity will be increased, and the air exit and exhaust distribution will be modified according to the simulated results.  
 
TUPLS137 Design of the Utility System for the 3 GeV TPS Electron Storage Ring controls, synchrotron, booster, synchrotron-radiation 1828
 
  • J.-C. Chang, J.-R. Chen, Y.-C. Lin, Y.-H. Liu, Z.-D. Tsai
    NSRRC, Hsinchu
  After 13-year operation of the Taiwan Light Source (TLS), National Synchrotron Radiation Research Center (NSRRC), had proposed to construct a new light sourc, Taiwan Photon Source (TPS) in the near future. TPS is preliminarily designed with 3.0 GeV in energy, 518.4m in circumference and 24 Double-Bend Achromat (DBA). This study designed the utility system, including the electrical power system, grounding system, de-ionized cooling water (DIW) system and air conditioning (AC) system for the TPS. Special considerations are focused on the stability of the electrical power and grounding system and temperature control of the DIW and AC systems. The power and cooling loads had been estimated according to each subsystem of the accelerator. Layouts of main utility equipment and piping system had also been preliminarily designed.  
 
WEXPA02 New Developments on RF Power Sources klystron, DIAMOND, linac, ESRF 1842
 
  • J. Jacob
    ESRF, Grenoble
  The classical generation of RF power with klystrons and tetrodes is evolving and changing to meet the demands of higher efficiency and simpler maintenance. Developments of IOT tubes for FEL, Energy Recovery Linacs and Storage Rings, together with solid state technology approaches and combination techniques for high power generation are opening new alternatives to the classical ones. An overview of the new concepts, designs and solutions applied to the new accelerators will be presented. Advantages and drawbacks of new versus classical technologies as well as strategies for the selection will be discussed.  
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WEOFI02 RF Phase Modulation Studies at the LNLS Electron Storage Ring damping, synchrotron, single-bunch, electron 1905
 
  • N.P. Abreu, R.H.A. Farias, P.F. Tavares
    LNLS, Campinas
  In this work we present a set of measurements of the effectiveness of RF phase modulation on the second harmonic of the RF frequency as a mechanism to damp longitudinal coupled-bunch instabilities. We also propose a theoretical model of the damping mechanism, in which the increase of the spread in synchrotron frequencies inside the bunches produced by phase modulation is responsible for damping the centroid dipolar coherent motion caused by an external excitation, which could be a Higher Order Mode (HOM) of the RF cavities driving the coupled bunch motion. We measured the coherent synchrotron oscillation damping of a single bunch under two circumstances, with and without phase modulation, and determined the amount of extra damping due to the modulation. With this experiment we could also measure the frequency of small oscillations around the stable islands formed by phase modulation and its behavior when the RF phase modulation amplitude and frequency are changed. We performed measurements of Beam Transfer Function (BTF) to observe the effects of phase modulation over the stable area for coherent oscillations and compared the results with a theoretical model.  
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WEPCH005 Advances in Beam Orbit Stability at the LNLS Electron Storage Ring synchrotron, vacuum, radiation, shielding 1924
 
  • L. Liu, R.H.A. Farias, M.J. Ferreira, S.R. Marques, F. Rodrigues, P.F. Tavares, R.P.C.C. Tenca
    LNLS, Campinas
  We describe recent efforts made at the Brazilian Synchrotron Light Source (LNLS) to improve beam orbit stability. The main driving force is the high positional stability required by some specific experiments and particularly by a high resolution undulator beamline which is being built at LNLS. Recent steps taken to improve orbit stability include the development of x-ray BPMs to measure the vertical position of the x-ray beam, analysis of RF BPM movement due to thermal load induced by synchrotron radiation after injection, new algorithms to deal with BPM electronics or control board false readings and revision and modification of their installations. In addition a weighted least squares method was developed to account for global correction while simultaneously privileging some local source point position. These upgrades are part of an ongoing work to improve beam orbit stability at LNLS.  
 
WEPCH012 Comparison of Betatron Function Measurement Methods and Consideration of Hysteresis Effects betatron, quadrupole, optics, injection 1945
 
  • O. Kopitetzki, D. Schirmer, G. Schmidt, K. Wille
    DELTA, Dortmund
  Two methods for determining the betatron functions in a storage ring were used to survey the linear optics at Delta. The fast orbit response analysis is used to gain betatron functions at the beam position monitors (BPMs) and dipole correctors. These are compared to betatron functions measured by the tune scan method which gives the beta functions in the quadrupoles. To improve the accuracy of the betatron functions obtained by the tune scan method a measuring procedure is introduced which considers the hysteresis effects in the quadrupole magnets. Systematic deviations in the beta functions measured between the two methods have been observed. The calibration errors of the BPMs can explain the observed deviations. With the orbit response analysis also the betatron phase advances between the measurement points can be calculated. Because these do not depend on the calibration errors, unlike the betatron functions, the differences between measurement and model can be determined more precise. A comparison of both methods with the optics model will be presented.  
 
WEPCH013 Electron Transport Line Optimization using Neural Networks and Genetic Algorithms injection, booster, synchrotron, electron 1948
 
  • D. Schirmer, T. Buening, P. Hartmann, D. Mueller
    DELTA, Dortmund
  Methods of computational intelligence (CI) were investigated to support the optimization of the electron transfer efficiency from the booster synchrotron BoDo to the electron storage ring DELTA. Neural networks and genetic algorithms were analysed alternatively. At first both types of methods were trained on the basis of a theoretical model of the transport line. After the training various algorithms were used to improve the magnet settings of the real transport line elements with respect to the electron transfer efficiency. The results of different strategies are compared and prospects as well as limitations of CI-methods to the application of typical optimization problems in accelerator operation are discussed.  
 
WEPCH018 Finite Elements Calculations of the Lattice and Ring Acceptance of the Heidelberg CSR CSR, quadrupole, lattice, ion 1960
 
  • H. Fadil, M. Grieser, A. Wolf, R. von Hahn
    MPI-K, Heidelberg
  A new Cryogenic Storage Ring (CSR) is currently being designed at MPI-K in Heidelberg. This electrostatic ring, which will store ions in the 20~300 keV energy range (E/Q), has a total circumference of 35.2 m and a straight section length of 2.8 m. The ring design was at first carried out with the optics code MAD in the first order approximation. Further investigation of the optics was performed with the finite elements electrostatic code TOSCA. The individual elements of the CSR (deflectors and quadrupoles) were calculated then a model of the entire ring was simulated with successful storage (tracking) of 20keV protons for many turns. The lattice parameters thus obtained were compared with the MAD results and show good agreement. The dynamic ring acceptance was also calculated for the standard operating point.  
 
WEPCH023 Longitudinal Coherent Oscillation Induced in Quasi-isochronous Ring synchrotron, power-supply, electron, closed-orbit 1972
 
  • Y. Shoji, Y. Hisaoka, T. Matsubara, T. Mitsui
    NewSUBARU/SPring-8, Laboratory of Advanced Science and Technology for Industry (LASTI), Hyogo
  Noise sources, which excite longitudinal coherent oscillation is discussed. Especially in a quasi-isochronous electron storage ring an identification of the noise sources is important to obtain an extremely short bunch. One possible source is a well-known rf noise in the acceleration field. The other is a magnetic field ripple, which changes a path-length for a revolution. The analytical formula for the longitudinal coherent oscillation is explained. It contains the path-length oscillation, which had never been considered. The third is a beam itself, probably be a coherent radiation loss. The driving term is not symmetric along the energy axis, then the oscillation amplitude depends on the higher order momentum compaction factor.  
 
WEPCH024 Matrix Formulation for Hamilton Perturbation Theory of Linearly Coupled Betatron Motion resonance, betatron, coupling, lattice 1975
 
  • M. Takao
    JASRI/SPring-8, Hyogo-ken
  Linear coupled motion in a circular accelerator was successfully parametrized through the transfer matrix approach, where normal mode Twiss and coupling parameters are defined as an extension of Courand and Snyder formulation. However it is not straightforward to assign analytical expressions to the coupling parameters. On the other hand the coupled motion was analytically solved by the Hamilton perturbation theory, which ingeniously describes the resonance phenomena. In the perturbation theory, however, the symplectic structure of the coupled motion is obscure in turn. Hence, for the purpose of combining both the theories with each other with keeping the respective virtues, we develop the matrix formulation based on the Hamilton perturbation theory. Since we have already known the solution of equation of motion, we can construct the transfer matrix in terms of the solution. Thus we formulate the betatron motion with linear coupling resonance in analytic and symplectic manner. As an application of the formulation, we investigate the two-dimensional beam ellipse in an electron storage ring.  
 
WEPCH052 Injection System for Kharkov X-ray Source NESTOR injection, alignment, quadrupole, lattice 2038
 
  • A.Y. Zelinsky, P. Gladkikh, I.M. Karnaukhov, A. Mytsykov
    NSC/KIPT, Kharkov
  During the last three years a Kharkov X-ray generator NESTOR is under design and construction in NSC KIPT. According to the design report, electrons are injected in the storage ring at 100 MeV and ramped up to final energy 225 MeV. Due to compact design of the ring the injection trajectory of the beam will pass through fringe field of a NESTOR bending magnet. It brings additional difficulties on design of an injection channel. In the paper the layout, results of design and calculations of NESTOR injector channel are presented. The channel consists of two bending magnets, five-lens, asymmetrical, objective and two-lens matching cell to compensate dispersion and focusing effects of a dipole magnet fringe field and injection system elements (inflector). Presented results shows that designed lattice provides matching of injected beam parameters with the storage ring acceptance, is stable to element alignment errors and is easy controlled. The final values of the channel lens gradients can be defined only after measurements of inflector field profile.  
 
WEPCH059 Linear Lattice Modeling of the Recycler Ring at Fermilab quadrupole, lattice, coupling, controls 2056
 
  • M. Xiao, V.P. Nagaslaev, A. Valishev
    Fermilab, Batavia, Illinois
  • V. Sajaev
    ANL, Argonne, Illinois
  The Recycler Ring at Fermilab is a fixed 8 GeV kinetic energy storage ring, by the use of permanent magnets in the ring lattice. It is a strong focusing FODO lattice made up of either two gradient magnets or two quadrupoles(in dispersion free straight sections). The magnetic properties of all magnets used were measured before installation and surveyed in place to minimize possible errors. Nevertheless, substantial differences are found in tunes and beta functions between the existing linear model and the real storage ring. It results in difficulties when tuning the machine to new lattice conditions. We are trying to correct the errors by matching the model into the real machine using Orbit Response Matrix(ORM) method. The challenge with ORM particular in this ring and the results are presented in this paper.  
 
WEPCH060 Linear and Nonlinear Coupling Using Decoupling Transformations coupling, quadrupole, lattice, sextupole 2059
 
  • A. Wolski, A. Sessler
    LBNL, Berkeley, California
  Linear coupling in a storage ring is conveniently analyzed in terms of transformations that put the single-turn map into block-diagonal form. Such a transformation allows us to define new variables, in which the dynamics are uncoupled. Thus, for example, the symplectic conditions are simply that the phase area in each of the uncoupled variables is preserved. In principle, a similar approach may be taken to nonlinear coupling; we discuss such an approach in this paper, giving some simple illustrations of the ideas, based on the well-known techniques of normal form analysis. We also discuss some obstacles to finding a nonlinear decoupling transformation in the general case.  
 
WEPCH075 Effect of Insertion Devices on Beam Dynamics of the Diamond Storage Ring Using Kick Maps injection, lattice, resonance, coupling 2092
 
  • B. Singh, A.I. Baldwin, R. Bartolini, I.P.S. Martin
    Diamond, Oxfordshire
  The effect of the all Phase-I Insertion Devices (IDs) on the beam dynamic of the Diamond storage ring has been investigated using the kick map modelisation of the IDs. Kick maps have been produced with high accuracy using the computer code RADIA, considering many longitudinal harmonics. The effect of IDs on the dynamic aperture, Touschek lifetime and injection efficiency in the low emittance lattice, was investigated considering both coupling errors and physical engineering apertures. Harmful resonances have been identified using Frequency Map Analysis (FMA) and full 6D tracking was performed to estimate the Touschek lifetime and the injection efficiency. Additionally, the kick maps have been used to generate feed-forward tables for compensation of linear optics distortion.  
 
WEPCH076 Renormalization Group Reduction of the Frobenius-Perron Operator resonance, betatron, sextupole, lattice 2095
 
  • S.I. Tzenov
    Universita' degli Studi di Salerno, Dipartimento di Fisica E.R. Caianiello, Baronissi
  The Renormalization Group (RG) method is adopted as a tool for a constructive analysis of the properties of the Frobenius-Perron Operator. The renormalization group reduction of a generic symplectic map in the case, where the unperturbed rotation frequency of the map is far from structural resonances driven by the kick perturbation has been performed in detail. It is further shown that if the unperturbed rotation frequency is close to a resonance, the reduced RG map of the Frobenius-Perron operator (or phase-space density propagator) is equivalent to a discrete Fokker-Planck equation for the renormalized distribution function. The RG method has been also applied to study the stochastic properties of the standard Chirikov-Taylor map.  
 
WEPCH085 Algorithms for Chromatic Sextupole Optimization and Dynamic Aperture Increase sextupole, dynamic-aperture, lattice, betatron 2116
 
  • E. Levichev, P.A. Piminov
    BINP SB RAS, Novosibirsk
  Strong chromatic sextupoles compensating natural chromaticity of a storage ring may reduce dynamic aperture drastically. In the case of several sextupole families, one can find a lot of ways to correct chromaticity, which provides different sizes of the dynamic aperture. Finding a solution that gives the largest dynamic aperture is an important task for the storage ring design and operation. The paper discusses several approaches to sextupole arrangement optimization in order to obtain a large dynamic aperture.  
 
WEPCH136 Monte Carlo Simulation Model of Internal Pellet Targets target, scattering, simulation, injection 2239
 
  • O.A. Bezshyyko, K.A. Bezshyyko, I.M. Kadenko, R.V. Yermolenko
    National Taras Shevchenko University of Kyiv, The Faculty of Physics, Kyiv
  • A. Dolinskii
    NASU/INR, Kiev
  • V.G. Ziemann
    UU/ISV, Uppsala
  We develop a numerical model of a pellet target and use it for Monte Carlo simulations of the interaction of a circulating beam with a pellet target. Real geometry details of the pellet beam and the beam are taken into account. We emphasize the role of tails of non-Gaussian distributions for transverse scattering and energy loss. These effects are especially important for simultaneous calculations of electron cooling, intrabeam scattering and target influence. Black-box algorithms for the generation of automatic nonuniform random variate distributions are used for the effective time averaging of scattering angle and energy loss distributions.  
 
WEPLS010 20 - 50 GeV Muon Storage Rings for a Neutrino Factory lattice, site, injection, sextupole 2415
 
  • G. Rees
    CCLRC/RAL/ASTeC, Chilton, Didcot, Oxon
  • C. Johnstone
    Fermilab, Batavia, Illinois
  • F. Meot
    CEA, Gif-sur-Yvette
  Muon decay ring studies are being undertaken as part of the International Scoping Study (ISS) for a Neutrino Factory. A racetrack and an isosceles triangle shaped ring are under design, initially for a muon energy of 20 GeV, but with an upgrade potential for 50 GeV. Both rings are designed with long straights to optimize directional muon decay. The neutrinos from the muon decays pass to one or two distant detectors; the racetrack ring has one very long production straight, aligned with one detector, while the triangular ring has two straights, each half as long, which can be aligned with two detectors. Lattice studies, injection, collimation, and RF system design for the large acceptance, high intensity rings are discussed and the performance of the two rings compared.  
 
WEPLS011 General Design Considerations for a High-intensity Muon Storage Ring for a Neutrino Factory site, injection, proton, target 2418
 
  • C. Johnstone
    Fermilab, Batavia, Illinois
  • F. Meot
    CEA, Gif-sur-Yvette
  • G. Rees
    CCLRC/RAL/ASTeC, Chilton, Didcot, Oxon
  Muon decay ring design, shielding, and compatibility with potential neutrino detector sites are a critical part of the International Scoping Study (ISS) for a neutrino factory. Two rings are under development: a racetrack and an isosceles-triangle ring initially for muon energy of 20 GeV, but upgradable to 50 GeV. Neutrinos from the muon decays in specially designed production straights can be directed to one or two distant detectors; the racetrack ring has one very long production straight, aligned with one detector, while the triangular ring has two straights, each half as long, aligned with two detectors. An initial site survey of accelerators and distant detectors has been made, along with the required tilt angles from the horizontal will be discussed here. (Lattice studies, injection, collimation, and RF system design are covered in a separate contribution to these proceedings.) Heating and activation effects of beam loss in the chamber walls and components will also be presented.  
 
WEPLS074 SESAME Magnets System dipole, quadrupole, sextupole, focusing 2553
 
  • S. Varnasseri
    SESAME, Amman
  In this paper the SESAME storage ring magnet system is described. The storage ring consists of 16 bending magnets with a maximum field of 1.455 T and vertical gradient of 2.79 T/m, 32 focusing quadrupoles with a maximum gradient of 16.92 T/m, 32 defocusing quadrupoles with a maximum gradient of 10.23 T/m, 32 focusing sextupoles with a maximum differential gradient of 200 T/m2 and 32 defocusing sextupoles with the maximum differential gradient of 300 T/m2. The horizontal/vertical correctors will be embedded inside focusing/defocusing sextupoles. For the quadrupole and sextupole, a design similar to ANKA has been adopted. The magnetic and electrical design of dipoles and correctors, field profile and higher order multipoles optimization will be presented.  
 
WEPLS080 Magnets for the Storage Ring ALBA quadrupole, sextupole, multipole, dipole 2562
 
  • M. Pont
    ALBA, Bellaterra
  • E. Boter, M.L. Lopes
    CELLS, Bellaterra (Cerdanyola del Vallès)
  The Storage Ring ALBA is a 3.0 GeV synchrotron light source under construction in Barcelona (Spain). The Storage Ring, has a circumference of 268.8 m and comprises 32 combined magnets, 112 quadrupoles, and 120 sextupoles. This paper will describe the design and the present state of these magnets. The combined magnet has a central field of 1.42 T and a large gradient of 5.65 T/m, since most of the vertical focusing happens at these combined magnets. The 112 quadrupoles have been designed for a maximum gradient of 22 T/m. The bore diameter will be 61 mm and the lengths range from 200 to 500 mm. Each quadrupole will be individually powered. The 120 sextupoles are divided in 9 families. There are two lengths of sextupoles 150 and 220 mm and the maximum sextupole gradient is 600 T/m2. The bore diameter is 76 mm. The sextupole magnets will also be equipped with additional coils for vertical steering, horizontal steering and quadrupolar skew correction.  
 
WEPLS115 Impedances in Slotted-Pipe Kicker Magnets kicker, impedance, vacuum, simulation 2649
 
  • F. Marhauser, O. Dressler, V. Duerr, J. Feikes
    BESSY GmbH, Berlin
  Storage ring slotted-pipe kicker magnets based on the DELTA design are foreseen for the Metrology Light Source (MLS) of the Physikalisch-Technische Bundesanstalt currently under construction near the BESSY site. Although the slotted pipe maintains the cross-section of the storage ring vacuum chamber, image currents have to bypass the slots generating wakefields. Actually modes with substantial impedances have been revealed by simulations and verified by measurements of a kicker model for the MLS.  
 
THXPA01 Overview of the Status of the Diamond Project DIAMOND, booster, vacuum, injection 2718
 
  • R.P. Walker
    Diamond, Oxfordshire
  The presentation will outline the status of the Diamond project including an overview of the major areas of technical challenge including reference to the physics issues and their impact on design and performance. The majority of the talk will present the status and challenges of first commissioning, outlining the current performance and the challenges in achieving operational status.  
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THXPA02 Overview of the Status of the SOLEIL Project SOLEIL, booster, vacuum, undulator 2723
 
  • J.-M. Filhol, J.C. Besson, P. Brunelle, M.-E. Couprie, J.-C. Denard, J.M. Godefroy, C. Herbeaux, V. Le Roux, P. Lebasque, A. Lestrade, M.-P. Level, A. Loulergue, P. Marchand, J.L. Marlats, A. Nadji, L.S. Nadolski, R. Nagaoka, B. Pottin, M.-A. Tordeux
    SOLEIL, Gif-sur-Yvette
  SOLEIL is a third generation synchrotron radiation source, under construction in France near Paris. The storage ring consists of a 357 m circumference ring, with 16 cells and 24 straight sections, out of which up to 21 will house insertion devices (ID). The optics features a low 3.7 nm.rad emittance at the 2.75 GeV operating energy, so as to provide high brilliance, from the VUV up to the hard x-ray domain. To reach a long lifetime, and beam position stabilities in the micron range, significant attention was paid at each design stage (optics, magnets, beam position monitors, vacuum and RF systems…), including on the design of the building, the construction of which is now complete. This resulted in some unprecedented approaches such as the intensive use of NEG coating vessels, or the development of a dedicated SC RF cavity and of 200 kW solid state RF amplifiers. The injector system (100 MeV Linac) and the 3 Hz full energy booster synchrotron have reached nominal operating conditions by fall 2005, while the ring commissioning should start by April 2006. Innovative ID's were designed and built so as to provide the best possible performances in a wide energy range (5 eV to 50 keV).  
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THOBFI03 Record-high Resolution Experiments on Comparison of Spin Precession Frequencies of Electron Bunches Using the Resonant Depolarization Technique in the Storage Ring electron, positron, radiation, polarization 2787
 
  • S.A. Nikitin, O. Anchugov, V.E. Blinov, A. Bogomyagkov, V.P. Cherepanov, G.V. Karpov, V. Kiselev, E. Levichev, I.B. Nikolaev, A.A. Polunin, E. Shubin, E.A. Simonov, V.V. Smaluk, M.V. Struchalin, G.M. Tumaikin
    BINP SB RAS, Novosibirsk
  The opportunity of performing an experiment on high precision comparison of the electron and positron anomalous magnetic moments following the VEPP-2M experiment is under study at the VEPP-4M storage ring. The record accuracy of 2x10-8 was obtained for comparison of spin precession frequencies in the experiment on resonant depolarization with simultaneously circulating electron bunches, two of them polarized and one unpolarized. It is the first time when the spreading of the spin precession frequency line (~5x10-7,) due to scattering of particle trajectories about the equilibrium orbit in a non-linear field of the storage ring, was presumably observed in experiments. We proposed and realized an RF scheme for controlled separation of the spin precession frequencies of two electron bunches; the first measurements using this scheme were made.  
slides icon Transparencies
 
THPCH031 Impedance and Beam Stability Study at the Australian Synchrotron impedance, synchrotron, higher-order-mode, resonance 2844
 
  • R.T. Dowd, M.J. Boland, G. LeBlanc, M.J. Spencer, Y.E. Tan
    ASP, Clayton, Victoria
  We present the preliminary results of an impedance study of the Australian Synchrotron storage ring. Beam stability thresholds have been determined and an overall impedance budget set. Broad-band impedance has been evaluted for various components of the vacuum chamber, using both analytical formulae and results from MAFIA simulations. Narrow band resonances have also been investigated, with particular attention paid to higher order modes in the RF cavities and their effect on multi-bunch instabilities.  
 
THPCH035 Characterisation of the EU-HOM-damped Normal Conducting 500 MHz Cavity from the Beam Power Spectrum at DELTA CBM, impedance, synchrotron, single-bunch 2856
 
  • R.G. Heine, P. Hartmann, T. Weis
    DELTA, Dortmund
  A HOM-damped prototype cavity developed in the framework of an EC collaboration has been installed into the Dortmund synchrotron light source DELTA. This paper reports on beam studies performed at beam energies of 1.5 GeV and 542 MeV in an attempt to get information on coupled bunch instability thresholds. In addition an evaluation of the longitudinal cavity impedance is presented, based on beam power spectra up to 3 GHz for different filling patterns of the storage ring by analysing the RF signal from the HOM-dampers.  
 
THPCH038 The PANDA Insertion Impedance in High Energy Storage Ring of FAIR impedance, insertion, CERN, vacuum 2865
 
  • E. Senicheva, A. Lehrach, D. Prasuhn
    FZJ, Jülich
  The PANDA insertion due to the special shape of the vacuum pipe creates a discontinuity. This was expected to be the main contribution in the impedance of the vacuum chamber. In this paper we present the results of computations dealing with this problem. From many published articles it is known that the reliability of the results depends on many factors and some time they differ from each other significantly. Therefore we have investigated the impedance of the PANDA insertion using different codes and methods, in particular, MAFIA, ABCI and the analytical estimation with the formula Yakoya recognized as a most successful theoretical estimation of the tapers. Besides, PANDA has two symmetrical T-shape insertions, which have been calculated by 3D MAFIA and compared with the results given by the diffraction theory. We have analysed the longitudinal and the transverse impedance.  
 
THPCH039 Beam Studies with Coherent Synchrotron Radiation from Short Bunches in the ANKA Storage Ring synchrotron, radiation, FIR, synchrotron-radiation 2868
 
  • A.-S. Müller, I. Birkel, S. Casalbuoni, B. Gasharova, E. Huttel, Y.-L. Mathis, D.A. Moss, P. Wesolowski
    FZK, Karlsruhe
  • C. J. Hirschmugl
    UWM, Milwaukee, Wisconsin
  In the ANKA storage ring it is possible to store bunches with RMS lengths of the order of 1 ps using a dedicated optics with reduced momentum compaction factor. For short bunch operation a beam energy of 1.3 GeV is chosen as a trade-off between low energy longitudinal instabilities and the increase in natural bunch length with energy. At this medium energy (the energy range of the ANKA storage ring is 0.5 to 2.5 GeV) steady state emission of coherent synchrotron radiation is observed by the ANKA-IR beamline below the threshold current defined by the micro-bunching instability. At lower beam energies where the natural bunch length is significantly shorter, bursts of coherent synchrotron radiation are detected in spite of the longitudinal oscillation. The far infrared spectrum is sensitive to the dynamics of the charge distribution generating the radiation. Measurements of the frequency spectrum of the infrared detector signal add information on bunch dynamics. This paper gives an overview of the studies performed at the ANKA storage ring.  
 
THPCH042 Numerical Estimations of Wakefields and Impedances for Diamond Collimators impedance, simulation, DIAMOND, injection 2877
 
  • S.A. Pande, R. Bartolini, R. T. Fielder, M. Jensen
    Diamond, Oxfordshire
  The storage ring of the Diamond light source will use two collimators, one in horizontal and one in the vertical planes in the injection straight to protect the IDs from the injection and Touschek losses. These collimators, in the form of tapered metallic intrusions in to the vacuum chamber, will generate considerable wake fields and will contribute to the overall machine impedance. In this paper we present the results of ABCI and MAFIA numerical simulations to estimate these effects.  
 
THPCH062 Collective Effects in the Storage Ring of Taiwan Photon Source impedance, insertion, insertion-device, damping 2928
 
  • P.J. Chou, C.H. Kuo, C.-C. Kuo, M.-H. Wang
    NSRRC, Hsinchu
  A new 3- 3.3 GeV synchrotron light source is proposed and named the Taiwan Photon Source (TPS). The TPS design has a natural horizontal emittance less than 2 nm-rad and low emittance coupling, which results in small beam size. The nominal bunch length in TPS storage ring is much shorter compared to the existing Taiwan Light Source, that makes the issue of parasitic heating more significant. Several small-gap insertion devices are planned to provide extremely bright x-ray photon beam. Those design features have impacts on collective beam instabilities. A preliminary study of collective effects in the TPS storage ring is presented.  
 
THPCH066 Transient Beam Loading in the DIAMOND Storage Ring DIAMOND, beam-loading, simulation, damping 2937
 
  • S. De Santis, J.M. Byrd
    LBNL, Berkeley, California
  • R. Bartolini
    Diamond, Oxfordshire
  Harmonic cavity systems have been installed on several 3rd generation light sources to lengthen the bunches and increase the Touschek lifetime. Apart from this beneficial effect, harmonic cavities are known to increase the transient beam loading in high-current machines, due to the presence of gaps in the fill pattern. The amplitude of this effect, which is substantially larger than that caused by the main RF system, can in turn produce considerable variations in bunch length and phase along the train, which result in a significant reduction of the lifetime increase. We have developed a tracking simulation, which we have applied to the analysis of the beam loading transients in Diamond, for the case of passive superconducting harmonic cavities. The influence of beam current, gap amplitude and harmonic cavity tuning on the final lifetime have been studied, as well as the effects of higher-order modes.  
 
THPCH108 Status of SOLEIL Control Systems controls, SOLEIL, ESRF, booster 3053
 
  • A. Buteau, P. Betinelli, L.S. Nadolski
    SOLEIL, Gif-sur-Yvette
  The SOLEIL light source is a 2.75 GeV third generation synchrotron radiation facility under construction near Paris Storage ring commissioning is scheduled for April 2006 and 10 BL operation for the end of 2006. This paper will describe the technical solution choosen for the control systems of accelerators and beamlines, and will give the status of the deployment. On the hardware side, the SOLEIL Controls team has implemented an industrial approach using PLCs, standard Motion Controlers and CPCI Systems. The details of our technical choices and architectures will be described in this paper. On the software side, the SOLEIL Controls team has worked closely with ESRF's one on the TANGO framework since 2002. A quick tour on the TANGO software components used for SOLEIL Controls will be detailed. On the supervision layer, SOLEIL has choosen Java as the core technology, using javabeans components provided by the TANGO toolkit within an industrial SCADA (GlobalScreen). These tools and components for Graphical User Interface development will be presented. At last, an overview of the deployment of these systems on our installation will conclude this document.  
 
THPCH109 Control Applications for SOLEIL Commissioning and Operation controls, SOLEIL, synchrotron, booster 3056
 
  • L.S. Nadolski, A. Buteau, J. Chinkumo, R.C. Cuoq, X. Deletoille, M.O. Ounsy, S. Petit, K.S. Saintin
    SOLEIL, Gif-sur-Yvette
  Synchrotron SOLEIL, the French third generation light source being commissioned in 2006, is the first facility using TANGO as a full control system. Control applications for operation and Beam Physics Dynamics have being developed using two major tools: the Matlab Middle Layer adapted from ALS and Spear3, and GlobalSCREEN, commercial SCADA software. Both tools are fully interfaced with the TANGO control system. In this paper, a sketch of the software architecture is shown. Then Storage Ring applications developed in house are presented. Finally configuration and database related applications (archiving, snapshot) are briefly described.  
 
THPCH112 High-level Software for Diamond Commissioning and Operation DIAMOND, booster, controls, quadrupole 3065
 
  • R. Bartolini, C. Christou, I.P.S. Martin, J.H. Rowland, B. Singh
    Diamond, Oxfordshire
  The Diamond accelerator complex is controlled with EPICS. While generic applications are provided by the EPICS toolkit, accelerator physics application for the commissioning and operation of the Diamond booster, storage ring and transfer line are mainly developed with MATLAB. The MATLAB Middle Layer tools developed at ALS and SPEAR3 have been extensively used and extended with many new applications. Experience using these tools during the commissioning of the Diamond booster, transfer lines and storage ring are reported.  
 
THPCH121 Development of Machine Interlock System HMI for PLS controls, vacuum, linac, injection 3086
 
  • B.R. Park, J. Choi, H.-S. Kang, J.-W. Lee, J.C. Yoon
    PAL, Pohang, Kyungbuk
  The Machine Interlock System (MIS) for the Pohang Light Source (PLS) is used for the monitoring and control of machine devices and equipments for operation and maintenance, and protects machine devices and equipments by interlock chain program at fault status. The MIS consists of one central system unit and seven remote local system units, and is implemented mainly using GE-FANUC's Programmable Logic Controller (PLC). Using information and data in the MIS, a human-machine interface (HMI) for the MIS is developed for the operator and system manager to efficiently control and monitor the MIS and also to log various event, trip, fault data automatically. Wonder's FactorySuite is used for the HMI development software. The HMI is developed under PC environments, which communicates with the MIS through RS-485 serial link.  
 
THPCH127 Development of MATLAB-based Data Logging System at Siam Photon Source controls, synchrotron, SPS, photon 3098
 
  • P. Klysubun, C. Netsai
    NSRC, Nakhon Ratchasima
  New data logging and retrieval systems are currently under development at Siam Photon Source. The systems are written entirely with MATLAB language and utilize two MATLAB toolboxes to handle data communications. The two toolboxes are Open Process Control Toolbox, which is used to carry out communications with Programmable Logic Controllers (PLCs) via Open Process Control Data Access (OPCDA), and Data Acquisition Toolbox, which handles communications with other systems via RS-232 and IEEE-488 interconnections. The interface with the database is handled by the MATLAB Database Toolbox. These MATLAB-based logging and retrieval systems enable accelerator physicists to easily import the logged data to accelerator modeling tools for studies of the accelerator optics. Beamline researchers and users can also write their own retrieval programs to access only the data they need. In this paper we describe the concept, the current status of the systems, and the planned improvements to be carried out in the future.  
 
THPCH130 Design and Implementation of Analog Feedback Damper System for an Electron-proton Instability at the Los Alamos Proton Storage Ring feedback, kicker, LEFT, impedance 3104
 
  • C. Deibele, S. Assadi, V.V. Danilov, S. Henderson, M.A. Plum, C. Sibley III
    ORNL, Oak Ridge, Tennessee
  • S. Breitzmann, S.-Y. Lee
    IUCF, Bloomington, Indiana
  • J.M. Byrd
    LBNL, Berkeley, California
  • J.D. Gilpatrick, R.J. Macek, R.C. McCrady, J.F. Power, J. Zaugg
    LANL, Los Alamos, New Mexico
  The PSR (Proton Storage Ring) at LANSCE has observed an E-P (electron-proton) instability. A wideband analog feedback damper system was designed and implemented that has shown it is possible to correct this instability. The damper system consists of two 180 degree hybrids, low level amplifiers, a delay line, comb filter, power amplifiers, and adjustable delay lines. The system bandwidth is about between 10-300 MHz, and was developed and implemented in stages showing improvement in the e-p threshold of the buncher voltage. The system takes advantage of fiber optic technology for delays as well as for the comb filter. A system description and some measurement results are presented.  
 
THPCH154 Development of Pulsed Laser Super-cavity for Compact High Flux X-ray Sources laser, electron, photon, target 3155
 
  • K. Sakaue, M. Washio
    RISE, Tokyo
  • S. Araki, Y. Higashi, Y. Honda, T. Taniguchi, J. Urakawa
    KEK, Ibaraki
  • M.K. Fukuda, M. Takano
    NIRS, Chiba-shi
  • H. Sakai
    ISSP/SRL, Chiba
  • N. Sasao
    Kyoto University, Kyoto
  Pulsed-laser super-cavity is being developed at KEK-ATF for the application of a compact high brightness x-ray source based on Laser Compton Scattering. We use a Fabry-Perot optical cavity with a pulsed laser. The cavity increases a laser effective power, and at the same time, stably makes a small laser spot in side the cavity. In addition, the pulsed-laser gives much higher peak power. Thus, this scheme will open up a new possibility for building a compact high-brightness x-ray source, when collided with an intense bunched electron beam. We are now planning to build such an x-ray source with a 50MeV multi-bunch linac and a 42cm Fabry-Perot cavity using pulse stacking technology. We actually finished construction of the 50MeV linac and will start its operation in the spring, 2006. Development of the pulsed-laser super-cavity and future plan of our compact x-ray source will be presented at the conference.  
 
THPCH168 RF Distribution System of the Diamond Master Oscillator synchrotron, DIAMOND, linac, booster 3188
 
  • A.V. Watkins, M. Jensen, M. Maddock, S.A. Pande, S. Rains, D. Spink
    Diamond, Oxfordshire
  A modular RF distribution system has been designed and built at Diamond Light Source to distribute the master oscillator (MO) signal. The system will deliver a low noise, phase stable 500 MHz signal to multiple points of use around the synchrotron facility. Providing phase stability and preserving noise performance over the distances required (up to 300m) have been the main design challenges. A modular approach provides future flexibility, and this paper describes each component, outlining design choices, components used, construction details and test results.  
 
THPCH179 High Power Cavity Combiner for RF Amplifiers simulation, electron, scattering, coupling 3215
 
  • F. Pérez, B. B. Baricevic, D. Einfeld, P. Sanchez
    ALBA, Bellaterra
  • J.P. Buge, M.L. Langlois, G. Peillex-Delphe
    TED, Thonon
  A new approach of RF power combination has been developed for the ALBA Storage Ring RF system: a three-port high power Cavity Combiner (CaCo). A prototype has been successfully built and tested in Thales Electron Devices, Thonon, France. The final goal is to combine the power of two 80 kW IOTs at 500 MHz in order to provide a total output power of 160 kW. In this paper, a summary of the analytical and simulation analysis of the expected behaviour is given. In basis of that, the decided geometric constraints and the final design configuration chosen for the prototype production are explained. Low power test results and matching, and finally the high power test performances, are shown. As a conclusion, the RF system of the ALBA Storage Ring will incorporate the CaCo concept to obtain the needed power per cavity from the combination of two IOTs.  
 
THPCH186 Magnetic Field Measurement and Fine-tuning of Kickers kicker, injection, synchrotron, synchrotron-radiation 3236
 
  • T.-C. Fan, C.-H. Chang, C.-S. Fann, C.-S. Hwang, F.-Y. Lin
    NSRRC, Hsinchu
  We have demonstrated an algorithm which promisingly can tune the pulse shape of current and magnetic field of kicker systems in-situ. This algorithm includes gap shimming of the ferrite magnets to adjust the pulse width of the excitation current and changing the resistance of the secondary coils to modify the pulse curvatures of each kicker. With the empirical formula derived from the systematic measurement on the magnetic field and the pulse current in laboratory, we can reduce the pulse-shape difference among the kicker magnets in the injection section of the storage ring, with no need to do anything on the pulsers and high voltage power suppliers. This approach can efficiently increase the injection efficiency which is demanding in the top-up injection mode adopted by many new facilities of synchrotron radiation.  
 
THPCH187 Analysis and Reduction Electromagnetic Interference to ICTs Caused by Pulsed Power Supply Excitation in NSRRC kicker, injection, electron, power-supply 3239
 
  • Y.-H. Liu, J.-C. Chang, J.-R. Chen, Y.-C. Lin
    NSRRC, Hsinchu
  The purpose of this paper is to eliminate the Electromagnetic Interference (EMI) from kicker power supply. Analyses of the EMI source and the propagation path are the beginning missions. The radiated and conducted EMI both affected the Integral Current Transformer (ICT) normal operation because of the space limitation for TLS in NSRRC. The ICT is to measure injection efficiency, thus, ICT located just behind the kickers and using the common girder. The EMI signals therefore are much higher than the electron beam currents, and the integral values of the sensor are not correct. For reducing and eliminating the interference of electromagnetic waves, a hybrid segregation and grounding method was used. The EMI wrapper was enclosed the ICT and its high frequency amplifier separately to prevent the radiated EMI from the space. The grounding paths provided the possible stray current dredge to the ground loop. It reduced the stray current spread to the subsystems next to the kickers. The EMI therefore reduced 99%, and the injection efficiency could be calculated successfully. The elimination of the EMI from kicker itself will be the next step in the future.  
 
THPLS002 X-ray and Optical Diagnostic Beamlines at the Australian Synchrotron Storage Ring diagnostics, synchrotron, controls, electron 3263
 
  • M.J. Boland, R.T. Dowd, G. LeBlanc, M.J. Spencer, Y.E. Tan, A. Walsh
    ASP, Clayton, Victoria
  Two diagnostic beamlines have been designed and constructed for the Australian Synchrotron Storage Ring. One diagnostic beamline is a simple x-ray pinhole camera system, with a BESSY II style pinhole array, designed to measure the beam divergence, size and stability. The second diagnostic beamline uses an optical chicane to extract the visible light from the photon beam and transports it to various instruments. The end-station of the optical diagnostic beamline is equipped with a streak camera, a fast ICCD camera, a CCD camera and a fill pattern monitor. The beamline design and some commissioning measurements are presented.  
 
THPLS003 When Less is More - Construction of the Australian Synchrotron synchrotron, injection, undulator, linac 3266
 
  • D. Morris
    ASP, Clayton, Victoria
  The Australian Synchrotron is a 3 GeV facility under construction next to Monash University in Melbourne. The project was launched in January 2003 and is scheduled for completion in March 2007. The funding of Aus$206M (about 125 MEuros) covers all costs associated with the site, building, accelerators and the first nine beamlines. The building contract was placed in July 2003 and completed in February 2005. Installation of the accelerators began in April 2005 and should be complete by May 2006. Commissioning of the injection system began in October 2005, and storage ring commissioning will begin mid-2006, with beamline commissioning beginning January 2007 and facility handover in March 2007. The project is being delivered with a staff of less than 50, which has meant that much of the detailed design work and project management for major systems (e.g., the injection system, RF system, support girders, vacuum vessels and front ends) has been performed by commercial suppliers under turn-key contracts. The presentation will discuss the main technical challenges, and results will be presented of the commissioning of the linac, booster and storage ring.  
 
THPLS007 Magnetic Measurements Results of the Dipoles, Quadrupoles and Sextupoles of the SOLEIL Storage Ring quadrupole, dipole, SOLEIL, sextupole 3278
 
  • P. Brunelle, C. Benabderrahmane, P. Berteaud, F. Briquez, A. Dael, L. Dubois, M. Girault, A. Madur, F. Marteau, A. Nadji, F. Paulin, J. Vétéran
    SOLEIL, Gif-sur-Yvette
  During the magnetic measurement campaign, from May 2004 to August 2005, the 326 electro-magnets of the SOLEIL Storage Ring have been characterized in terms of magnetic axis centering and field properties. For the dipoles, two types of measurements have been performed at SOLEIL: field mapping in the mid plan using a Hall probes bench, and field integral comparison with a reference magnet using a stretched wire bench. For the quadrupoles, a rotating coil bench has been built and optimized at SOLEIL in order to reach magnetic center and tilt angle adjustments within ± 25 μm and ± 0.1 mrad respectively. For the sextupoles, magnetic measurements have been performed by the SIGMAPHI Company. This paper will present the main features of the SOLEIL benches, the results of magnetic measurements in terms of reproducibility, field identity between magnets, magnetic axis centering, and harmonic content versus current. Moreover, the origin of some unexpected harmonic field components will be discussed, as well as the magnetic compensation scheme used to minimize some of them.  
 
THPLS009 First Results of the Commissioning of SOLEIL Storage Rings SOLEIL, injection, quadrupole, closed-orbit 3284
 
  • A. Nadji, J.C. Besson, P. Betinelli, P. Brunelle, A. Buteau, L. Cassinari, M.-E. Couprie, J.-C. Denard, J.-M. Filhol, P. Gros, C. Herbeaux, J.-F. Lamarre, P. Lebasque, M.-P. Level, A. Loulergue, A. Madur, P. Marchand, L.S. Nadolski, R. Nagaoka, B. Pottin, M.-A. Tordeux
    SOLEIL, Gif-sur-Yvette
  The commissioning of SOLEIL's storage ring will start in April 2006. The objective is to reach, within a first phase of two months, stable beam conditions at 100 mA in the multi-bunch mode that can be used for the commissioning of the beamlines. This is a challenging objective, especially because the SOLEIL's ring is incorporating some innovative techniques such as the use of a superconducting RF cavity, NEG coating for all straight parts of the machine and new BPM electronics. Prior to the start of the commissioning, some insertion devices and most of the insertion devices low gap vacuum vessels, including 10 mm inner vertical aperture vessels for the Apple-II type, will be installed on the ring. This paper will review the performances of all these equipment in presence of the beam. The results of the first commissioning runs will be presented.  
 
THPLS013 The Magnets of the Metrology Light Source in Berlin-Adlershof quadrupole, dipole, sextupole, octupole 3296
 
  • P. Budz, M. Abo-Bakr, K. Buerkmann-Gehrlein, V. Duerr, J. Kolbe, D. Krämer, J. Rahn, G. Wüstefeld
    BESSY GmbH, Berlin
  • I.N. Churkin, E.R. Rouvinsky, E.P. Semenov, S.V. Sinyatkin, A.G. Steshov
    BINP SB RAS, Novosibirsk
  • R. Klein, G. Ulm
    PTB, Berlin
  PTB, the German National Metrology Institute in close cooperation with BESSY II, is currently carrying out the project of constructing the low-energy "Metrology Light Source" (MLS) as a synchrotron radiation facility situated in the close vicinity of BESSY II. Construction of the MLS housing is in progress and nearly finished. The user operation is scheduled to begin in 2008. Dedicated to metrology and technology development in the UV and EUV spectral range, the MLS will bridge the gap that is existent since the shutdown of BESSY I. A 100 MeV microtron delivered by Danfysik A/S will provide the electrons for the MLS with a structure of asymmetric double bend achromat. The total circumference of the MLS is 48 m. The electron energy is ramped to the desired value between 200 MeV and 600 MeV. The MLS magnetic lattice, consisting of 8 bending magnets, 24 quadrupole magnets, 24 sextupole magnets and 4 octupole magnets, is laid out to facilitate this operation. The contract for the MLS magnets is awarded to the Budker Institute for Nuclear Physics. A description of the MLS magnets based on the results of the factory acceptance tests should be presented.  
 
THPLS014 Status of the Metrology Light Source microtron, injection, electron, synchrotron 3299
 
  • K. Buerkmann-Gehrlein, M. Abo-Bakr, W. Anders, P. Budz, O. Dressler, V. Duerr, J. Feikes, H.G. Hoberg, D. Krämer, P. Kuske, R. Lange, J. Rahn, T. Schneegans, D. Schueler, E. Weihreter, G. Wuestefeld
    BESSY GmbH, Berlin
  • R. Klein, G. Ulm
    PTB, Berlin
  For more than 25 years, the Physikalisch-Technische-Bundesanstalt (PTB) uses synchrotron radiation at the storage rings BESSY I and II for photon metrology in the spectral range of UV to x-rays. Since decommissioning of BESSY I (1999), there is a gap in the spectral range of UV and EUV wavelength due to the higher electron energy of BESSY II. Thus, in 2003, the Metrology Light Source (MLS), a low energy electron storage ring, was approved, as central instrument in the future Willy Wien Laboratory (WWL). Design, construction and operation of the MLS are realized by BESSY, based on the PTB requirements for a permanent accessible radiometry source, optimized for the spectral range between UV up to VUV. The MLS is tuneable in energy between 200 MeV and 600 MeV, designed for currents between 1pA up to 200mA. Civil construction of WWL in the close vicinity to BESSY is nearing completion. The first MLS components will be installed in spring 2006, commissioning of the 100MeV Microtron is scheduled for summer 2006, while commissioning of the storage ring will start in spring 2007. Regular user operation will begin in January 2008. A status and an overview on the construction of the MLS are  
 
THPLS017 Orbit Stability in the 'Low Alpha' Optics of the BESSY Light Source insertion, insertion-device, synchrotron, optics 3308
 
  • R. Müller, J. Feikes, P. Kuske, G. Wuestefeld
    BESSY GmbH, Berlin
  Running the light source during dedicated shifts in the so-called 'low alpha' mode, BESSY serves two major user groups: THz experiments take advantage of intense, coherent synchrotron radiation (CSR) generated by the short bunches. Time resolved experiments appreciate the very short, high intensity VUV and x-ray pulses in the ps range that help, e.g., prepare the high resolution, low intensity fs-slicing experiments. In the 'low alpha' mode, the sensitivity of the storage ring with respect to energy and horizontal orbit is increased by orders of magnitude while the user experiments require the same beam stability as in 'normal' mode. In this paper an overview of the operational conditions of this specific user mode, the stabilization measures taken, observations and available diagnostic results as well as the achievements and shortcomings of the adapted slow orbit feedback are given.  
 
THPLS019 The Metrology Light Source: an Electron Storage Ring Dedicated to Metrology electron, radiation, photon, synchrotron 3314
 
  • R. Klein, G. Ulm
    PTB, Berlin
  • P. Budz, K. Buerkmann-Gehrlein, J. Rahn, G. Wuestefeld
    BESSY GmbH, Berlin
  PTB, the German National Metrology Institute, in close cooperation with BESSY, is currently setting up a low-energy electron storage ring (200 MeV up to 600 MeV electron energy), the Metrology Light Source MLS, which will be dedicated to metrology and technology development in the UV and EUV spectral range which synchrotron radiation. The MLS has been designed by BESSY according to PTB specifications. User operation is scheduled to begin in 2008. Currently, the building, housing the storage ring, is nearly completed, and all major parts of the storage ring and the injection system have been ordered or have already been delivered. The MLS will be equipped with all the instrumentation necessary to measure the storage ring parameters needed for the calculation of the spectral photon flux according to the Schwinger theory with low uncertainty, enabling PTB to operate the MLS as a primary source standard. Moreover, calculations show, that the MLS is ideally suited for the production of coherent synchrotron radiation in the far IR and THz region. We give a status update on the construction, the instrumentation for the measurement of the storage ring parameters and calculations for a low-  
 
THPLS022 Radiation Dose Related to ANKA Operation Mode radiation, optics, emittance, injection 3323
 
  • I. Birkel, MH. Hagelstein, E. Huttel, A.-S. Müller, P. Wesolowski
    FZK, Karlsruhe
  Radiation doses in the ANKA hall are measured by area monitoring and Albedo dosimeters. In August 2004 the machine optics was replaced by a new optics with reduced emittance and higher brightness. Measurements of the beam lifetime and the related radiation doses show a strong correlation between the operation mode of the machine and the dose distribution in the hall.  
 
THPLS025 Diamond Light Source Vacuum Systems Commissioning Status vacuum, controls, DIAMOND, photon 3332
 
  • M.P. Cox, B. Boussier, S. Bryan, B.F. Macdonald, H.S. Shiers
    Diamond, Oxfordshire
  Diamond Light Source is a new 3 GeV light source currently being commissioned in the UK. The main vacuum systems are a 561.6 m circumference electron storage ring and a 158.4 m circumference booster ring. The storage ring target operating pressure is 1·10-9 mbar with 300 mA of stored beam after 100 A.h of beam conditioning. The booster ring target operating pressure is up to an order of a magnitude higher. Pumping is provided by discrete noble diode ion pumps, supplemented by titanium sublimation pumps and NEG cartridge pumps. Vacuum vessel construction is mainly from 316LN stainless steel. There is no in situ bakeout except for the 24 storage ring straights and the front ends. An ex situ bakeout process is used for the storage ring arcs followed by installation under vacuum. This paper reports results and experience from the construction and commissioning of the diamond vacuum systems.  
 
THPLS026 Front Ends at Diamond undulator, radiation, multipole, wiggler 3335
 
  • J. Strachan, D.G. Clarke
    CCLRC/DL, Daresbury, Warrington, Cheshire
  • H.C. Huang, J. Kay
    Diamond, Oxfordshire
  This paper describes the three different types of Front End that have been designed to transmit the intense synchrotron radiation generated by the undulator, multi-pole wiggler and bending magnet sources in the Diamond storage ring to the experiments. The functions of the main components and their location in the layout are described. The Finite Element Analysis that has been carried out to verify the performance under the high heat loads generated by Diamond is also described along with the limits on temperature and stress that have been employed in the design.  
 
THPLS027 Vibration Measurement at Diamond and the Storage Ring Response DIAMOND, ground-motion, synchrotron, site 3338
 
  • H.C. Huang, J. Kay
    Diamond, Oxfordshire
  Controlling and minimising the sources and transmission of vibration in Synchrotron Light Sources is an important factor in achieving the stability needed to generate the very brightest beams. This paper describes the equipment that has been used at Diamond to measure vibration and reports the results of measurements taken on the accelerator floor and on the girder structures carrying the Storage Ring. A description is given of the intensively piled foundations and a comparison is made between the measured response and the modelled response. The contribution to vibration from water and ventilation services is also discussed.  
 
THPLS028 Pulsed Magnets and Pulser Units for the Booster and Storage Ring of the Diamond Light Source booster, septum, kicker, injection 3341
 
  • V.C. Kempson, J.A. Dobbing
    Diamond, Oxfordshire
  • C.E. Hansen, N. Hauge, G. Hilleke
    Danfysik A/S, Jyllinge
  The Diamond booster and storage ring complex require ten pulsed magnet systems, five for the booster (injection and extraction) and five for the storage ring injection. Each has its own specific design criteria, although commonality of approach has been applied wherever possible. This paper describes the design principles and construction method for the various systems and presents the results of power supply tests and magnetic measurements. Finally, initial experience during the Diamond beam commissioning is discussed.  
 
THPLS033 Elettra New Full Energy Injector Status Report booster, ELETTRA, dipole, quadrupole 3356
 
  • M. Svandrlik, S. Bassanese, F.C. Cargnello, A. Carniel, K. Casarin, D. Castronovo, P. Craievich, G. D'Auria, R. De Monte, S. Di Mitri, A. Fabris, R. Fabris, M. Ferianis, A. Gambitta, F. Giacuzzo, M. Giannini, F. Iazzourene, G.L. Loda, M. Lonza, F.M. Mazzolini, D.M. Morelli, G. Pangon, C. Pasotti, G. Penco, L.P. Pivetta, L. Rumiz, C. Scafuri, G. Tromba, A. Vascotto, R. Visintini, D. Zangrando
    ELETTRA, Basovizza, Trieste
  The Elettra new full energy injector will be based on a 100 MeV linac pre-injector, a 2.5 GeV booster synchrotron and two new beam transfer lines. It will replace the existing 1.2 GeV linac injector and transfer line. Full funding was finally available in 2005, which allowed to start, or in some cases to re-start, the construction activities. The status of the project will be presented in this paper, in particular the progress of the fabrication of various components, like magnets, power supplies, vacuum chambers; also the status of the construction of the building and technical plants will be given. Results of recent optimization studies will also be outlined. The commissioning of the new injector is scheduled to start in Spring 2007, while the first ELETTRA operation for user's with the new full energy injector is expected for the last quarter of 2007.  
 
THPLS035 Next Generation Light Source Storage Ring at SPring-8 emittance, dynamic-aperture, sextupole, coupling 3362
 
  • K. Tsumaki, N. Kumagai
    JASRI/SPring-8, Hyogo-ken
  A linac-based XFEL and an ERL are widely accepted as next-generation light sources. But they still have many technologically difficult problems to overcome. In contrast, electron beams in a storage ring are very stable. Thus, we examined the possibility of the storage ring as a next-generation light source. We designed a storage ring with an energy of 6 GeV and a circumference of 1436 m. The ring consists of 24 ten-bend achromat cells and has a natural emittance of 83 pm·rad. The circumference is equal to that of SPring-8 storage ring and the cell length is two times, which enables us to replace the existing storage ring with this new one in the SPring-8 tunnel and use the photon beam-lines without constructing new ones. Particle tracking simulation showed that the horizontal dynamic aperture at the center of a straight section is -3.7 mm and +3.4 mm and that it can be increased to -6.6 mm and +10.0 mm by changing the sextupole strength for chromaticity correction while keeping zero chromaticity. In this paper, we describe the design and the dynamic aperture of the extremely low emittance storage ring at SPring-8.  
 
THPLS036 Results of the Straight-sections Upgrade of the Photon Factory Storage Ring undulator, vacuum, photon, factory 3365
 
  • T. Honda, S. Asaoka, W.X. Cheng, K. Haga, K. Harada, Y. Hori, M. Izawa, T. Kasuga, Y. Kobayashi, H. Maezawa, A. Mishina, T. Mitsuhashi, T. Miyajima, H. Miyauchi, S. Nagahashi, T. Nogami, T. Obina, C.O. Pak, S. Sakanaka, H. Sasaki, Y. Sato, T. Shioya, M. Tadano, T. Takahashi, Y. Tanimoto, K. Tsuchiya, T. Uchiyama, A. Ueda, K. Umemori, S. Yamamoto
    KEK, Ibaraki
  At the 2.5-GeV ring of the Photon Factory (PF), a large reconstruction of the lattice around the straight sections* has been accomplished in 2005. As a result, four short straight sections of 1.5 m have been newly created, and the lengths of the existing straight sections have been much improved. For example, the length of the longest straight section has been extended to 9 m from 5 m. The optics has been optimized for installing short-period narrow-gap (in-vacuum) undulators at the new straight sections. The reconstruction work on the ring was held from March to September 2005. In the range over two-thirds of the storage ring, all the quadrupole magnets and all the beam ducts have been renewed and rearranged. Commissioning of the storage ring was started from the end of September 2005 and continued for one month. The operation for the user experiment was resumed from the end of October on schedule. Though we made no in-situ baking after the installation for the beam ducts, the vacuum scrubbing by the synchrotron radiation is running very well. The product of the beam lifetime and the beam current exceeded 700 A min for the operation current 450 mA at the end of December 2005.

*S. Asaoka et al. "New Upgrade Project for the Photon Factory Storage Ring", AIP Conf. Proc. 705, p161 (2004).

 
 
THPLS043 Status of SESAME vacuum, dipole, lattice, power-supply 3383
 
  • G. Vignola, A. Amro, M. Attal, H. Azizi, A. Kaftoosian, F. Makahleh, M.M. Shehab, H. Tarawneh, S. Varnasseri
    SESAME, Amman
  An overview of the status of SESAME is presented. SESAME is a third generation light source facility, with an e-beam energy of 2.5 GeV, located in Allan, Jordan. The emittance is 26 nm.rad and 12 straights are available for insertion devices. The injector consists of a 22.5 MeV microtron and 800 MeV booster synchrotron, with a repetition rate of 1 Hz. The conceptual design of the accelerator complex has been frozen, and the engineering design is in progress. The phase I scientific program for SESAME has also been finalized, and it foresees 6 beam lines, including 2 IR ports. The construction of the SESAME building is in progress, and the beneficial occupancy is expected by the end of 2006. The completion of the accelerators complex construction is scheduled for the end of 2009.  
 
THPLS045 Construction Status of the SSRF Project power-supply, booster, vacuum, linac 3389
 
  • Z. Zhao
    SINR, Jiading, Shanghai
  • H. Ding, H. Xu
    SINAP, Shanghai
  The Shanghai Synchrotron Radiation Facility (SSRF), an intermediate energy third generation light source, is under construction at Zhang-Jiang Hi-Tech Park in Shanghai. Its main and auxiliary buildings are scheduled to be completed in October 2006, and this will be followed by the SSRF accelerator installations from October 2006 to March 2008. This paper presents the final design and the current construction status of the SSRF project.  
 
THPLS046 The Status of Instrumentation and Control for SSRF booster, linac, controls, diagnostics 3392
 
  • D.K. Liu
    SINAP, Shanghai
  The SSRF (Shanghai Synchrotron Radiation Facility) was started in December 25, 2004, and is located in the Zhang Jiang Hi-Teck park in Shanghai. During the past one year, the main structure is under construction and will be completed in the middle of next year on schedule. Various equipment is being processed and tested. The preliminary design of the control system, including various hardware and software, are completed, and some prototype of IOC with EPICS such as LINAC rf station, magnet station and beam diagnosis station, etc. have been already tested successfully. The digital power supply control will be adopted. Various beam instrumentation have been designed for diagnostics of the LINAC, booster and storage ring. The performance of the design, progress of the subsystem and preliminary test results of the prototype will be described in this paper in detail.  
 
THPLS048 Beam-optics Analysis and Periodicity Restoration in the Storage Ring of the Pohang Light Source quadrupole, optics, dynamic-aperture, focusing 3395
 
  • S.H. Shin, M. Yoon
    POSTECH, Pohang, Kyungbuk
  • E.-S. Kim
    PAL, Pohang, Kyungbuk
  The PLS is a third-generation synchrotron radiation source, which provides intense light from ultraviolet to soft x-rays. Similar to other light sources, the PLS is characterized by a small emittance in order to achieve a very high spectral brightness and stably circulating electron beam. To guarantee these characteristics, a thorough understanding of the linear optics has to be carried out, and many storage rings employ LOCO (Linear Optics from Closed Orbits) to analyse the linear optics. This paper will describe the LOCO implementation at PLS and the results.  
 
THPLS052 The Vacuum System for the Spanish Synchrotron Light Source (ALBA) vacuum, dipole, synchrotron, photon 3398
 
  • E. Al-Dmour, D. Einfeld, M. Q. Quispe, L. Ribó
    ALBA, Bellaterra
  ALBA will be a 3GeV, third generation synchrotron light facility to be built near Barcelona (Spain). The design phase of ALBA is almost completed and the main components have been ordered, which includes the vacuum chambers for the storage ring. Commissioning of the storage ring is foreseen to start at the end of 2008. The circumference of the storage ring of ALBA is 268.8 m, and it will be divided into 16 vacuum sections by ultra high vacuum (UHV) gate valves. The vacuum chamber will be made of stainless steel with an internal vertical aperture of 28 mm and 72 mm width. The vacuum chamber will be connected to an antechamber with a slot of 10 mm height and 20 mm width. The antechamber will have the discrete absorbers, which will absorb the unwanted synchrotron radiation. The pumping will be by sputter ion pumps (SIP) and NEG pumps, with an overall pumping speed from SIP of 57400 l/s. This will maintain an average dynamic pressure of around 1.0·10-9 mbar to achieve a beam lifetime > 15 hours at the designed current. No in-situ bakeout is foreseen, as the vacuum section will be conditioned ex-situ and installed under vacuum to the storage ring.  
 
THPLS053 Status of the ALBA Project synchrotron, booster, vacuum, insertion 3401
 
  • D. Einfeld
    ALBA, Bellaterra
  ALBA is a 3 GeV light source being built near Barcelona, Spain. ALBA is optimized for high flux density and a large number of available straight sections for insertion devices (3x8 m, 12x4.2 m) in a relatively small circumference of 268.8 m. The light source should be operational in 2010, including the operation of seven beamlines, including six insertion devices. The design of the lattice and of the major components of the accelerator complex (linac and booster, magnets, RF system, vacuum system) is finish and the procurement procedure has started for the large majority of them. The construction of the building will start in the first half of 2006. This report offers an overview of the status of the project, with special emphasis in the new developments.  
 
THPLS057 Injector Design for ALBA booster, linac, quadrupole, dipole 3413
 
  • M. Pont, G. Benedetti, D. Einfeld, A. Falone, U. Iriso, M.L. Lopes, M. Muñoz
    CELLS, Bellaterra (Cerdanyola del Vallès)
  • E. Al-Dmour, F. Pérez
    ALBA, Bellaterra
  • W. Joho
    PSI, Villigen
  The storage ring ALBA is a 3rd generation synchrotron light source under construction in Barcelona (Spain). The facility is based on a 3.0 GeV storage ring of 268.8 m circumference with a beam emittance under 5 nm.rad. Top-up operation is foreseen from the start. The injector complex for ALBA will consist of a 100 MeV linac and a full energy booster. The linac will be a turn-key system which has already been ordered to the industry and delivery is expected in the second half of 2007. The full energy booster will be placed in the same tunnel as the storage ring and will have a circumference of 249.6 m. The lattice of the booster is a modified FODO lattice providing an emittance as low as 9 nm.rad. The magnet system comprises 40 combined magnets and 60 quadrupoles. Chromaticity correction relies on the sextupole component built-in the combined magnets and the quadrupoles. In this paper a description of the booster design including the present status of the different components will be given.  
 
THPLS059 Status of the MAX IV Light Source Project undulator, linac, radiation, electron 3418
 
  • M. Eriksson, M. Berglund, K.I. Blomqvist, M. Brandin, T. Hansen, D. Kumbaro, L.-J. Lindgren, L. Malmgren, M. Sjöström, H. Svensson, H. Tarawneh, S. Thorin, E.J. Wallén, S. Werin
    MAX-lab, Lund
  • B. Anderberg
    AMACC, Uppsala
  The present development of the accelerator part of the MAX IV synchrotron radiation project is presented. The main features of the 3 GeV injector linac and the two storage rings operated at different electron energies to cover a broad spectral range of high brilliance undulator radiation are described in some detail. A third ring, the existing MAX III ring, is planned to be transferred to the new facility. The preparation of the injector linac to serve as a free electron laser source and the major sub-systems of the facility are also presented.  
 
THPLS062 Sub-picosecond X-ray Source FEMTO at SLS laser, SLS, undulator, wiggler 3427
 
  • A. Streun, A. Al-Adwan, P. Beaud, M. Böge, G. Ingold, S. Johnson, A. Keller, T. Schilcher, V. Schlott, T. Schmidt, L. Schulz, D. Zimoch
    PSI, Villigen
  The FEMTO source at the SLS (Swiss Light Source) employs laser/e-beam 'slicing' to produce sub-picosecond x-ray pulses for time resolved pump/probe experiments. The final design of the source, the status of construction and commissioning as well as the first experimental results will be presented.  
 
THPLS064 Design Concept of the Vacuum System for the 3 GeV Taiwan Photon Source vacuum, photon, simulation, electron 3433
 
  • G.-Y. Hsiung, C.K. Chan, C.-H. Chang, H.P. Hsueh, T.L. Yang
    NSRRC, Hsinchu
  • J.-R. Chen
    NTHU, Hsinchu
  The design concept of the vacuum system for the electron storage ring of the Taiwan Photon Source (TPS), 518.4 m in circumference, is described. The vacuum system for the synchrotron light source not only meets the specifications of an electron beam energy of 3 GeV and a beam current at 400 mA but also provides a safety factor of 1.7 (~ 500 mA) at 3.3 GeV at the upper bound. The vacuum system for the storage ring is built with consideration of the following features: (1) Large aluminum bending chambers to simplify the ultra-high vacuum (UHV) structure; (2) Absorbers located as far from the source as possible to reduce the heat load and associated yield of photon stimulated desorption (PSD) as well as the photoelectron; (3) Vacuum pumps located in the antechamber and closed to the absorbers to increase the localized pumping efficiency and to minimize the impedance of beam ducts; (4) Quantity of flanges and bellows is significantly reduced. Configuration of the pumps, results of the simulation for the pressure and thermal stress, and the criteria of the design will be discussed.  
 
THPLS074 Ground Vibration Measurement at NSRRC Site site, background, emittance, simulation 3454
 
  • D.-J. Wang, H.-P. Chang, J.-R. Chen, J.P. Wang, J. Wang
    NSRRC, Hsinchu
  For the future 3GeV TPS project in the NSRRC, ground vibration would be important for this low emittance machine. We have monitored the ground vibration under various experimental conditions at the NSRRC site. Sensors were installed in the bare site, underground 35 meters deep and ground of TLS storage ring, including an electricity shutdown in the NSRRC. From the collected data, we compare the effect about day and night, traffic effect, internal machine vibration propagation. Specific vibration sources and their propagations are also discussed.  
 
THPLS075 Progress in Development of Kharkov X-Ray Generator injection, quadrupole, electron, lattice 3457
 
  • A.Y. Zelinsky, V.P. Androsov, E.V. Bulyak, A. Dovbnya, I.V. Drebot, P. Gladkikh, V.A. Grevtsev, Yu.N. Grigor'ev, A. Gvozd, V.E. Ivashchenko, I.M. Karnaukhov, N. Kovalyova, V.P. Kozin, V. Lapshin, V.P. Lyashchenko, V. Markov, N.I. Mocheshnikov, V.B. Molodkin, A. Mytsykov, I.M. Necklyudov, F.A. Peev, O.V. Ryezayev, A.A. Shcherbakov, A. Shpak, V.L. Skirda, V.A. Skomorokhov, Y.N. Telegin, V.I. Trotsenko, O.D. Zvonarjova
    NSC/KIPT, Kharkov
  • A. Agafonov, A.N. Lebedev
    LPI, Moscow
  • J.I.M. Botman
    TUE, Eindhoven
  • R. Tatchyn
    SLAC, Menlo Park, California
  Over the past year the design, development and construction of NSC KIPT X-ray generator NESTOR has been in progress. NESTOR is a new type radiation source on the base of Compton scattering and a 40 - 225 MeV electron storage ring. Electrons are injected in the storage ring at 100 MeV and ramped up to final energy 225 MeV. It is supposed that stored electron beam current will be of about 200 mA. Along with use of Nd:Yag laser of 10 W average power which was developed by High-Q laser firm and optical resonator with accumulation gain of about 1000 it allows to provide X-ray radiation flux up to 1011 phot/s. NESTOR is the cooperative facility and is supported both as well Ukrainian government as NATO SfP project #977982. It is supposed that NESTOR will be in operation in the middle of 2007 year. The status of the project and main facility systems are described in the report.  
 
THPLS076 Status of RF Deflecting Cavity Design for the Generation of Short X-Ray Pulses in the Advanced Photon Source Storage Ring damping, radiation, impedance, KEK 3460
 
  • G.J. Waldschmidt, M. Borland, Y.-C. Chae, K.C. Harkay, D. Horan, A. Nassiri
    ANL, Argonne, Illinois
  The Advanced Photon Source (APS) at Argonne National Laboratory is exploring the possibility of using radio frequency deflection to generate x-ray radiation pulses on the order of 1 pico-second (Delta t - 70%) or less*. This scheme is based on a proposal by A. Zholents et al.** that relies on manipulating the transverse momenta of the electrons in a bunch by using an rf deflecting cavity to induce a longitudinally dependent vertical deflection of the beam. The beam will then travel through a number of undulators before arriving at a second set of deflecting cavities where the deflection is reversed such that the remainder of the storage ring is largely unperturbed***. Considerable effort has been expended on the design of a superconducting rf deflecting cavity operating in the S-Band at 2.8 GHz to address fundamental design issues including cavity geometry, deflecting voltage, rf power coupling, tuning, and damping of higher-order and lower-order modes. In this paper we present simulation results and analysis of an optimized superconducting rf deflecting cavity design for the APS storage ring.

*K. Harkay et al. Proceedings of 2005 PAC, Knoxville, TN, May 2005, p. 668. **A. Zholents et al. Nucl. Instrum. Methods, A425, 385 (1999). ***M. Borland and V. Sajaev. Proceedings of 2005 PAC, Knoxville, TN, May 2005, p. 3886.

 
 
THPLS078 Tests of a New Bunch Cleaning Technique for the Advanced Light Source injection, kicker, betatron, controls 3463
 
  • F. Sannibale, W. Barry, M.J. Chin
    LBNL, Berkeley, California
  A new bunch cleaning technique is being tested at the Advanced Light Source (ALS) of the Lawrence Berkeley National Laboratory. The new procedure allows for high purity, arbitrary filling patterns and is potentially compatible with standard user operation and with the incoming top-off injection mode. The description of the new system and the results of the first tests at the ALS are presented.  
 
THPLS079 Bunch Diffusion Measurements at the Advanced Light Source photon, injection, electron, lattice 3466
 
  • F. Sannibale, W.E. Byrne, C.-W. Chiu, J. Guo
    LBNL, Berkeley, California
  • J.S. Hull, O.H.W. Siegmund, A.S. Tremsin, J. Vallerga
    UCB, Berkeley, California
  In storage ring based synchrotron light sources, a long beam lifetime is usually a fundamental requirement for a high integrated brightness. The dynamic aperture and the momentum acceptance of lattices are carefully studied and maximized as much as possible for a long lifetime performance. On the other hand, large momentum acceptance and dynamic aperture increase the probability that a particle diffuses from one bunch to another. Diffusion can represent a severe limitation for those experiments where the samples have long relaxation times requiring empty buckets between bunches. At the Advanced Light Source (ALS) of the Lawrence Berkeley National Laboratory we have characterized the particle diffusion for the present lattice in order to evaluate its impact on a special user operation dedicated to these long relaxation time experiments and on the incoming top-off injection mode for the ALS.  
 
THPLS082 Status of the Top-off Upgrade of the ALS injection, radiation, brightness, undulator 3469
 
  • C. Steier, D. Robin, T. Scarvie
    LBNL, Berkeley, California
  In order to provide higher brightness and better stability, the ALS is being upgraded to top-off injection. One main part of the top-off modifications is an upgrade of the booster as well as extraction and injection elements and the transfer line for full energy. Further upgrades include new diagnostics, improved controls and timing system, and new radiation safety systems (monitors and interlocks).  
 
THPLS100 Four Matched Kicker Systems for the SOLEIL Storage Ring Injection, a Full Solid State Solution of Pulsed Power Supplies Working at High Current kicker, SOLEIL, vacuum, injection 3508
 
  • P. Lebasque, R. Ben El Fekih, C. Herbeaux, J.-P. Lavieville, J.L. Marlats
    SOLEIL, Gif-sur-Yvette
  The Top Up injection mode of the SOLEIL Storage Ring needs a very good matching of the four kicker magnet fields. But their implantation inside the straight section dedicated to SR injection imposed high level forces on each of the four kickers. This contribution describes the ceramic vacuum chambers and magnets design optimised to provide a very good identity of the four magnets. The pulsed power supplies, based on IGBT high voltage modules, designed to work at high current (5250 A-9000 V) could be located outside the SR tunnel. We highlight the specific development on all components specification and electrical scheme that permits to reach such a challenge. The electrical and magnetic measurement results are reported.  
 
THPLS101 Eddy Current Septum Magnets for Booster Injection and Extraction and Storage Ring Injection at Synchrotron SOLEIL septum, injection, booster, vacuum 3511
 
  • P. Lebasque, J. Da Silva, P. Gros, J.-P. Lavieville, A. Mary, D. Muller
    SOLEIL, Gif-sur-Yvette
  Eddy current thin septum magnets are used to inject or extract the electron beam to/from the Booster and to the Storage Ring of SOLEIL. Good transverse homogeneity in the gap for injected beam, and low leakage field on circulating beam is needed, as well as pulse stability. The Top Up injection mode of the Storage Ring needs a very low level of leakage field on the stored beam path. Operating currents are from 2000 A and 3000 A for Booster injection and extraction, to 5100 A for SR injection. This contribution will describe the magnets and the pulsed power supplies design. The electrical and magnetic measurement results will be presented, with a specific emphasis on the improvements needed to reduce the level of leakage field of the SR septum magnet.  
 
THPLS102 Optimisation of the Coating Thickness on the Ceramic Chambers of the SOLEIL Storage Ring kicker, injection, SOLEIL, vacuum 3514
 
  • P. Lebasque, L. Cassinari, J.P. Daguerre, C. Herbeaux, M.-P. Level, C. Mariette, R. Nagaoka
    SOLEIL, Gif-sur-Yvette
  The SOLEIL storage ring injection section integrates four matched injection kicker magnets, two diagnostics kicker magnets and a beam shaker, which need ceramic vacuum chambers with an inner titanium coating. For each utilisation (according with its field amplitude and its time or frequency domain), the coating thickness has been evaluated from the different points of view: field attenuation, beam deposited power, magnet excitation deposited power, and cooling efficiency. So we could determine the different coating thicknesses and tolerances needed according to the different magnetic field shapes. The realised ceramic chambers have adequate coating resistances, with in particular a low non-uniformity among the matched injection kicker magnets chambers.  
 
THPLS107 Possibility of the Beam Injection Using a Single Pulsed Sextupole Magnet in Electron Storage Rings injection, sextupole, electron, quadrupole 3526
 
  • Y. Kobayashi, K. Harada
    KEK, Ibaraki
  Recently, we succeeded in the beam injection using a single pulsed quadrupole magnet (PQM) at the Photon Factory Advanced Ring (PF-AR). The PQM enables us to inject the beam into the storage ring without the local bump by several pulsed dipole magnets. In addition, since the stored beam is not kicked when the beam passes through the magnetic center of the PQM, we can avoid the coherent beam oscillation, which is often produced by the unclosed local bump. It is important for the top-up injection in electron storage rings as synchrotron radiation sources. However, in the case of the PQM, we have the problem that the beam profile slightly changes turn-by-turn after the excitation of the PQM. In order to solve it, we investigated the possibility of the beam injection using a single pulsed sextupole magnet (PSM) instead of the PQM. Here, we will present the simulation of the beam injection using the PSM.  
 
THPLS110 Injection Scheme for TPS Storage Ring injection, kicker, septum, lattice 3535
 
  • M.-H. Wang, H.-P. Chang, C.-C. Kuo, G.-H. Luo
    NSRRC, Hsinchu
  Taiwan Photon Source(TPS), a 3~3.3 GeV synchrotron light source with full energy injection is proposed to be built at NSRRC in Taiwan. In this paper we report the design of injection scheme for TPS. The space allocation of the injection components, the bumper design, the aperture consideration and the injection dynamics of injected and stored beam will all be discussed. The particle tracking of first few turns of injection is performed to evaluate the injection efficiency with the errors caused by the time jitter and amplitude stability of injection kickers. The issue of constant current operation will be also addressed.  
 
THPLS114 "CAMSHAFT" Bunch Kicker Design for the ALS Storage Ring kicker, vacuum, pick-up, feedback 3547
 
  • S. Kwiatkowski, K.M. Baptiste, W. Barry, J. Julian, L. Low, D.W. Plate, G.J. Portmann, D. Robin
    LBNL, Berkeley, California
  ALS is a 1.9 GeV third generation synchrotron light source that has been operating since 1992 at Lawrence Berkeley National Laboratory. There are two typical modes of operation of the ALS storage ring. In multibunch mode, the ring is filled to a current of 400 mA in 276 consecutive bunches with a single "camshaft" bunch located in the middle of the 52 bucket gap (h=328). Twice each year, ALS operates in "two-bunch" mode for periods of two weeks delivering 20 mA of average beam current in two diametrically opposite bunches to a small group of users requiring light pulses at lower rates. We plan to build a fast kicker system that will supply single bunch light to users during multibunch operation by displacing the orbit of the camshaft bunch at a prescribed frequency (every N turns). Realization of this project will increase ALS beam availability to multibunch users by at least 10%. This paper will describe the hardware design (pulse generator and beam deflection device) and the test results of the prototype kicker unit.  
 
THPLS137 Insertion Devices for the MAX IV Light Source undulator, insertion, insertion-device, radiation 3607
 
  • E.J. Wallén, K.I. Blomqvist, B. N. Jensen, U. Johansson
    MAX-lab, Lund
  The foreseen insertion devices and expected brilliance for the MAX IV light source are presented. The planned MAX IV light source consists of three low emittance storage rings and a 3 GeV linac. The linac is used as a full energy injector. The three storage rings will be operated at 700 MeV, 1.5 GeV, and 3.0 GeV, which makes it possible to cover a large spectral range from IR to hard X-rays with insertion devices optimised for each storage ring.  
 
THPLS139 In-Achromatic Superconducting Wiggler in Taiwan Light Source: Installation and Test Results wiggler, cryogenics, vacuum, electron 3613
 
  • C.-H. Chang, C.-C. Chang, H.-P. Chang, H.-H. Chen, J.-R. Chen, T.-C. Fan, G.-Y. Hsiung, M.-H. Huang, C.-S. Hwang, J.C. Jan, F.-Y. Lin
    NSRRC, Hsinchu
  In order to increase more high flux x-ray photon beams for the Taiwan Light Source, the achromatic superconducting wiggler has been installed and tested in a 1.5 GeV storage ring. The 3.1 Tesla superconducting wiggler will be operated in a 4.5 K liquid helium cryogenic system. In this work, the operation experience and test results of the achromatic superconducting wiggler are described.