Keyword: booster
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MOXAA01 ALBA Synchrotron Light Source Commissioning storage-ring, linac, synchrotron, injection 1
 
  • D. Einfeld
    CELLS-ALBA Synchrotron, Cerdanyola del Vallès, Spain
  
  ALBA is a 3rd generation Synchrotron Light Source build in Barcelona, Spain. It is a 3 GeV Light Source with a circumference of roughly 270 m, an emittance of 4.4 nmrad and a design current of 400 mA. The storage ring has 24 straight sections from which 19 can be used for the installation of insertion devices, the rest will be used for injection, RF-cavities and diagnostic. The storage ring has been optimized for a high photon flux density for the users. The 3 GeV booster synchrotron with an emittance smaller the 10 nmrad is installed in the same tunnel. The pre injector is a 100 MeV Linac. The project started officially in 2004. The linac is operating since 2008, the booster since 2010 and the first commissioning phase for the storage ring will be finished in June 2011. This presentation gives an overview of the ALBA project with the emphasis on the results of the commissioning of the three accelerators Linac, booster synchrotron and storage ring.  
slides icon Slides MOXAA01 [8.891 MB]  
 
MOPC001 Linac Waveguide Upgrade at the Australian Synchrotron Light Source klystron, linac, controls, synchrotron 62
 
  • R.T. Dowd, G. LeBlanc, K. Zingre
    ASCo, Clayton, Victoria, Australia
  
  The Australian Synchrotron Light Source (ASLS) uses a 100 MeV linac as the start of the acceleration chain for the injector. The two main accelerating structures of linac are normally fed by independent pulsed klystrons. A recent upgrade to the waveguide system has allowed for a single klystron to power both accelerating structures. While this operation mode delivers a reduced total beam energy, the operation of only a single klystron results in less wear and enhanced robustness against klystron breakdown. Commissioning results of single klystron operation of the linac are shown and future benefits are detailed.  
 
MOPC005 352.2 MHz – 150 kW Solid State Amplifiers at the ESRF cavity, klystron, HOM, power-supply 71
 
  • J. Jacob, G. Gautier, M.L. Langlois, J.M. Mercier
    ESRF, Grenoble, France
  
  The ESRF has ordered seven 352.2 MHz – 150 kW Solid State Amplifiers (SSA) from the French company ELTA, with a design derived from the existing SSA developed by SOLEIL. The first four SSA will be commissioned by the end of 2011 and will be connected to the two booster cavities in Winter 2012 providing in total 600 kW in 10 Hz cycles. Thanks to anti-flicker capacitor banks with a total of 3 F in the 280 V DC power supply, up to only 350 kW will be drawn from the mains as compared to 1200 kW for the former klystron transmitter. The three remaining SSA will be received in 2012 and will feed three new single cell HOM damped cavities on the storage ring. The analysis of the market had shown that an alternative to klystrons needed to be investigated to guarantee the long term operation of the ESRF. SSA can be operated with a number of RF modules lost and are therefore intrinsically highly redundant. In parallel to the production by industry of this first batch of SSA, the ESRF is developing its own amplifier modules and proposing an alternative way to combine typically hundred RF modules using a single cavity combiner.  
 
MOPC020 Development of an S-band Multi-cell Accelerating Cavity for RF Gun and Booster Linac gun, cavity, linac, electron 110
 
  • T. Aoki, K. Sakaue, M. Washio
    RISE, Tokyo, Japan
  • A. Deshpande
    SAMEER, Mumbai, India
  • M.K. Fukuda, N.K. Kudo, T. Takatomi, N. Terunuma, J. Urakawa
    KEK, Ibaraki, Japan
  
  Funding: Work supported by JST Quantum Beam Program
We have been developing a photocathode rf gun. The rf gun with multi cell can produce a high energy electron beam, so it may be used for numerous applications such as medicine and industry. At Laser Undulator Compact X-ray source (LUCX), we have developed a compact X-ray source based on inverse Compton scattering. Using a multi cell rf gun will make possible for the X-ray source to use for such applications. S-band 3.5 cell rf electron gun which is 20 cm long can produce more than 10 MeV electron beam. According to the simulation, it is said that the emittance of 3.5 cell rf gun is as low as that of 1.6 cell rf gun. The electromagnetic design has been performed with the code SuperFish, and the particle tracing by Parmela. The new rf gun is already installed and produced a high quality electron beam with energy of more than 10 MeV. As a consequence of the substantial efforts of developing rf cavity, we decide to make a compact RF accelerating structure with more cell for achieving a smaller system. The measurement results of using the 3.5 cell rf gun, the design of 12 cell booster cavity, and current status of 12 cell cavity manufacturing will be presented at the conference. 		 
 
MOPC029 Development of Injector for Compact FEL Tera-hertz Source in CAEP gun, electron, FEL, simulation 131
 
  • W. Bai, M. Li, X. Yang
    CAEP/IAE, Mianyang, Sichuan, People's Republic of China
  
  This paper introducs the development of a injector for compact FEL tera-hertz source at Institute of Applied Electronics in China Academy of Engineering Physics (IAE/CAEP). The injector consist of a main accelerator for energy booster section and a multicavity thermionic-cathode rf gun with low back bombardment, with total length no more than one meter. Numerical simulation result shows that the back bombardment power is less for the thermionic-cathode rf gun of the injector and the main accelerator has a good performance, which can provide high quality electron beam with emittance about 10 pi mm mrad, energy about 7 MeV and energy spread about 1%. At present, the preliminary hot test experiment on the injector has been done. The test results indicate that the mainly tested parameters agree well with the theoretical design ones. The process of the preliminary hot test experiment on the injector is present in this paper.  
 
MOPC077 Commissioning of Multibunch Feedback Systems at the Fast Ramping Stretcher Ring ELSA kicker, synchrotron, cavity, feedback 250
 
  • A. Roth, F. Frommberger, N. Heurich, W. Hillert, M. Schedler, R. Zimmermann
    ELSA, Bonn, Germany
  
  Funding: Supported by German Research Foundation through SFB/TR 16 and by Helmholtz Alliance through HA-101.
At the Electron Stretcher Facility ELSA of Bonn University, an external beam of either unpolarized or polarized electrons is supplied to hadron physics experiments. The ELSA stretcherring operates in the energy range of 1.2 to 3.5 GeV and achieves a duty cycle of up to 80% using a fast energy ramp of 4 GeV/s. Under these conditions, an increase of the internal beam current from an actual value of 20 mA up to 200 mA is planned. Such an upgrade is mainly limited by the excitation of multibunch instabilities. As one active counteraction, we have installed state-of-the-art bunch-by-bunch feedback systems for the longitudinal, as well as for both transverse planes. The detailed setup with all main components and first results of the commissioning of the systems will be presented. In particular, the performance of the longitudinal feedback with a stabilized synchrotron frequency during the fast energy ramp will be discussed. 		 
 
MOPC127 Development of High RF Power Solid State Amplifiers at SOLEIL storage-ring, cavity, power-supply, klystron 376
 
  • P. Marchand, M.E. El Ajjouri, R. Lopes, F. Ribeiro, T. Ruan
    SOLEIL, Gif-sur-Yvette, France
  
  In SOLEIL, 5 solid state amplifiers provide the required 352 MHz RF power: 1 x 35 kW for the booster (BO) cavity and 4 x 190 kW for the 4 superconducting cavities of the storage ring (SR). Based on a design fully developed in house, they consist in a combination of a large number of 330W elementary modules (1 x 147 in the BO and 4 x 724 in the SR) with MOSFET transistors, integrated circulators and individual power supplies. After 5 years of operation, this innovative design has proved itself and demonstrated that it was an attractive alternative to the vacuum tube amplifiers, featuring an outstanding reliability and a MTBF > 1 year. In the meantime, thanks to the acquired expertise and the arrival of the 6th generation transistors, SOLEIL has carried out developments which led to doubling the power of the elementary module (700 W at 352 MHz and 500 MHz), while improving the performance in terms of gain, efficiency and thermal stress. This approach was also extended to frequencies from the FM to L band. The increasing interest for this technology has led SOLEIL to collaborate with several other laboratories and conclude a transfer of know-how with the French company, ELTA-AREVA.  
 
MOPC130 High Power Solid State RF Amplifier Proposal for Iran Light Source Facility (ILSF) cavity, rf-amplifier, storage-ring, simulation 385
 
  • R. safian
    IPM, Tehran, Iran
  • M. Jafarzadeh
    ILSF, Tehran, Iran
  
  Solid state RF amplifiers are being considered for an increasing number of accelerator applications. Their capabilities extend from a few kW of power to several hundred kilo watts and from frequencies less than 100 MHz to above 1 GHz. This paper describes the proposed general scheme for the high power solid state RF generator of the Iran light source facility (ILSF). The maximum expected power of the generator is 200 KW which is used for driving the storage ring cavities. Similar RF generator with lower output power can be used for driving the booster cavities.  
 
MOPO041 Preliminary Testing of TPS Timing System controls, gun, linac, EPICS 574
 
  • C.Y. Wu, Y.-T. Chang, J. Chen, Y.-S. Cheng, P.C. Chiu, K.T. Hsu, K.H. Hu, C.H. Kuo, C.-Y. Liao
    NSRRC, Hsinchu, Taiwan
  
  The timing system of Taiwan Photon Source (TPS) provides synchronization for electron gun, modulators of linac, pulse magnet power supplies, booster power supply ramp, bucket addressing of storage ring, diagnostic equipments, beamline gating signal for top-up injection. The timing system utilizes a central event generator to generate events and distribute them over optic fiber network, and decodes them at the event receivers. The system supports uplink functionality which will be used for the fast interlock system to distribute signals like beam dump and post-mortem trigger. The timing system has now been in operation for Linac of TPS. This paper presents prototype for the timing system of TPS.  
 
MOPS016 First Observations of Intensity-dependent Effects for Transversally Split Beams resonance, extraction, space-charge, coupling 631
 
  • S.S. Gilardoni, M. Giovannozzi
    CERN, Geneva, Switzerland
  
  During the commissioning of the CERN PS Multi-Turn Extraction (MTE) tests with different beam intensities were performed. The beam current before transverse splitting was varied and the properties of the five beamlets obtained by crossing the fourth-order horizontal resonance were studied. A clear dependence of the beamlets’ parameters on the total intensity was found, which is a first observation of intensity-dependent effects for such a peculiar beam type. The experimental results are presented and discussed in this paper.  
 
TUPC068 SOLEIL Beam Orbit Stability Improvements feedback, synchrotron, photon, power-supply 1156
 
  • N. Hubert, Y.-M. Abiven, F. Blache, F. Briquez, L. Cassinari, J.-C. Denard, J.-F. Lamarre, P. Lebasque, N. Leclercq, A. Lestrade, L.S. Nadolski
    SOLEIL, Gif-sur-Yvette, France
  
  The electron beam orbit stability has been significantly improved at synchrotron SOLEIL. Low frequency noise sources have been localized and identified: the fans installed on the storage ring to cool down the ceramic chambers of the kickers, shaker and FCT, were slightly wobbling the electron beam orbit at 46, 50, 54 and 108 Hz. The localization method and the solutions that will allow reducing the noise from 0.8 μm RMS down to 0.3 μm are presented. Besides, a new 160 m long beamline, NANOSCOPIUM, is being installed on a canted straight section. Its photon beam position stability requirements are very tight calling for the following improvements: addition of 2 more BPMs and fast correctors in the orbit feedback loops, new INVAR stands for BPM and XBPM integrating Hydrostatic Level System sensors. The paper is also discussing other projects that did or will contribute to improving the beam orbit stability: installation of 145 temperature sensors on the storage ring, a new analog feedforward correction system for insertion devices, and the use of the bending magnet X-BPM measurements in the slow and fast orbit feedback loops.  
 
TUPO028 Emittance Compensation Scheme for the BERLinPro Injector emittance, space-charge, solenoid, linac 1497
 
  • A.V. Bondarenko, A.N. Matveenko
    HZB, Berlin, Germany
  
  Following funding approval late 2010, Helmholtz-Zentrum Berlin officially started Jan. 2011 the design and construction of the Berlin Energy Recovery Linac Project BERLinPro. The initial goal of this compact ERL is to develop the ERL accelerator physics and technology required to accelerate a high-current (100 mA) low emittance beam (1 mm•mrad normalized), as required for future ERL-based synchrotron light sources. Given the flexibility ERLs provides, a short bunch operation mode will also be investigated. The space charge is the main reason of emittance degradation in injector due to rather low injection energy (7 MeV). The implementation of emittance compensation scheme in the injector is necessary to achieve such low emittance. Since injector’s optics is axially non-symmetric, the 2D- emittance compensation scheme* is proposed to be used. Other sources of emittance growth are also discussed.
* S.V. Miginsky, "Emittance compensation of elliptical beam", NIM A 603 (2009) 32. 		 
 
TUPO035 Beam Dynamics at the ALICE Accelerator R&D Facility linac, FEL, simulation, cavity 1512
 
  • F. Jackson
    STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
  
  Funding: Science and Technology Facilities Council
ALICE is an energy recovery accelerator which drives an infrared free electron laser (IR FEL), based at STFC Daresbury Laboratory. Beam dynamics are of primary importance for the operation of the IR FEL, to ensure sufficient peak current with minimal energy spread and transverse emittance. Measurements of beam parameters are presented and compared with particle tracking simulations. Of particular interest in the ALICE machine is the relatively long injection line where space charge and velocity bunching effects can be significant. 		 
 
TUPS064 Construction Status of the Utility System for the 3GeV TPS Storage Ring storage-ring, status, controls, power-supply 1683
 
  • J.-C. Chang, J.-R. Chen, Y.-C. Chung, C.K. Kuan, K.C. Kuo, J.-M. Lee, Y.-C. Lin, C.Y. Liu, I. Liu, Z.-D. Tsai
    NSRRC, Hsinchu, Taiwan
  
  The construction of the utility system for the 3.0 GeV Taiwan Photon Source (TPS) has been contracted out in the end of 2009. The whole construction of the utility system is scheduled to be completed in the end of 2012. Total budget of this construction is about four million dollars. The utility system includes the electrical power, cooling water, air conditioning, compressed air and fire control systems. The TPS construction site is located adjacent to TLS. Some areas of TPS and TLS are overlapped. Under tight schedule, limit budget and geographic constrains, it is a challenge to complete the utility system construction of TPS on time, on budget, and to specification. This paper presents some main issues and status of the utility system construction for the TPS storage ring.  
 
TUPZ004 The NICA Facility in Polarized Proton Operation Mode collider, proton, ion, injection 1804
 
  • A.D. Kovalenko, N.N. Agapov, Y. Filatov, V.D. Kekelidze, R.I. Lednicky, I.N. Meshkov, V.A. Mikhaylov, A.O. Sidorin, A. Sorin, G.V. Trubnikov
    JINR, Dubna, Moscow Region, Russia
  
  Basic goal of the planned NICA facility at JINR is focused on the studying of heavy ion collisions over the energy range √s ~ 4…11 GeV/u. Capabilities of the proposed scheme were carefully analyzed in this case and reaching of the desired average luminosity, L = 1·1027 cm-2 s−1 for gold-gold collisions at √s = 9 GeV/u, have been confirmed. The other important NICA research domain is the experiments with polarized proton beams at the highest possible energy, the highest luminosity and polarization degree as well. The main aim is to provide √s ~ 25 GeV and L ~ 1·1031 cm-2 s−1. The unsolved aspects of the problem are discussed, possible solutions are analyzed and necessary modifications of the NICA scheme are considered as well.  
 
WEPC025 Modeling Results of the ALBA Booster emittance, dipole, injection, quadrupole 2058
 
  • G. Benedetti, D. Einfeld, U. Iriso, J. Marcos, Z. Martí, M. Muñoz, M. Pont
    CELLS-ALBA Synchrotron, Cerdanyola del Vallès, Spain
  
  The 3rd generation light source ALBA is in the process of being commissioned. The full energy 3 GeV booster synchrotron was commissioned in the during 2010, ramping the beam from extracted from the LINAC from an energy of 110 MeV to the 3 GeV required for injection in the storage ring. The lattice is based in combined function bending magnets, providing a small emittance beam (< 12 nmrad) at extraction. This paper reviews the agreement between the optics modeling and the measures performed during the commissioning, with special regard to the optics measurement during the ramping process. The results from the magnetic measurement for the combined magnets while ramping are included in the model to explain the movement of the tunes during the ramp.  
 
WEPC038 Beam Line Design and Beam Measurement for TPS Linac linac, quadrupole, single-bunch, diagnostics 2091
 
  • K.L. Tsai, H.-P. Chang, C.-T. Chen, C.-S. Fann, K.T. Hsu, S.Y. Hsu, C.-Y. Liao, K.-K. Lin, H.M. Shih
    NSRRC, Hsinchu, Taiwan
  • K. Dunkel, C. Piel
    RI Research Instruments GmbH, Bergisch Gladbach, Germany
  
  A beam line for examining the beam quality of TPS (Taiwan Photon Source) linac was designed and constructed in NSRRC. Beam parameters, such as energy, emittance and charge etc., are verified by using the equipments setup in the beam line for this purpose. The lattice design and its manipulation for the parameter measurements are presented in this report. Preliminary results and the tools associating with the measurement are briefly described.  
 
WEPC115 A Global Optimization Approach Based on Symbolic Presentation of a Beam Propagator controls, focusing, quadrupole, induction 2280
 
  • S.N. Andrianov, A.N. Ivanov, M. Kosovtsov, E.A. Podzyvalov
    St. Petersburg State University, St. Petersburg, Russia
  
  It is known that modern systems of beam lines consist of huge control elements even in the case of small machines. The problem of the beam line design leads us to formulate this problem as a global optimization ones. This approach allows us defining a family of appropriate solutions. On the next steps a researcher should narrow this optimal solutions set using additional methods and concepts. The symbolic presentation of necessary information plays leading role on all steps of the suggested approach. The corresponding implementation presented in the paper allows us to find the optimal sets in parameters spaces in a proper way. The corresponding applied software was used for solution of some practical probems. The described ideology implies to use distributed and parallel technologies for necessary computing and will be integrated in the Virtual Accelerator concept.  
 
WEPO013 Septum and Kicker Magnets for the ALBA Booster and Storage Ring kicker, injection, vacuum, storage-ring 2421
 
  • M. Pont, R. Nunez
    CELLS-ALBA Synchrotron, Cerdanyola del Vallès, Spain
  • E. Huttel
    KIT, Karlsruhe, Germany
  
  At the ALBA Synchrotron light source 6 kicker and 3 septa magnets are installed for beam injection and extraction. A 100 MeV beam coming from the linac is injected on axis into the Booster. The full energy (3 GeV) beam is extracted from the booster and injected into the Storage Ring, where 4 kicker magnets bring the stored beam close to the septa. All septa are direct driven out-of-vacuum magnets with C shape iron laminated yoke. The magnets are excited by a full sine approx. 300 μs pulse length; the nominal field is 0.15/0.84/0.9 T (booster injection/extraction/storage-ring-injection). The stray field seen by the stored beam is less than 1 μT. The booster kicker magnets are in-vacuum magnets with C-ferrite yoke. The magnets are excited by a 0.4 μs flat top pulse; the nominal field is 0.03/0.04 T (booster injection/extraction). The storage ring kickers have a C-ferrite yoke and a 0.4 μm Ti coated ceramic vacuum chamber. The excitation is done by 6 μs half sine; the nominal field is 0.13 T. The paper will present the design of the elements and their magnetic characteristics. First results of their behaviour during commissioning will also be discussed.  
 
WEPS014 RF Systems and Bunch Formation at NICA collider, ion, cavity, injection 2511
 
  • A.V. Eliseev, I.N. Meshkov, A.O. Sidorin, G.V. Trubnikov
    JINR, Dubna, Moscow Region, Russia
  • O.I. Brovko
    JINR/VBLHEP, Moscow, Russia
  • G.Y. Kurkin, V.M. Petrov
    BINP SB RAS, Novosibirsk, Russia
  
  The NICA facility being constructed at JINR will consists of two synchrotrons (Booster and Nuclotron) and collider working at constant magnetic field. To reach required luminosity level the collider rings will be operated with short ion bunches. The bunch formation in the collider as well as longitudinal dynamics in all the rings is described. The parameters and preliminary design of RF systems are presented.  
 
WEPS017 Plans for the Upgrade of the LHC Injectors linac, injection, synchrotron, electron 2517
 
  • R. Garoby, S.S. Gilardoni, B. Goddard, K. Hanke, M. Meddahi, M. Vretenar
    CERN, Geneva, Switzerland
  
  The LHC Injectors Upgrade (LIU) project has been launched at the end of 2010 to prepare the CERN accelerator complex for reliably providing beam with the challenging characteristics required by the high luminosity LHC until at least 2030. Based on the work already started on Linac4, PS Booster, PS and SPS, the LIU project coordinates studies and implementation, and interfaces with the High Luminosity LHC (HL-LHC) project which looks after the upgrade of the LHC itself, expected by the end of the present decade. The anticipated beam characteristics are described, as well as the status of the studies and the solutions envisaged for improving the injector performances.  
 
WEPS019 Study of a Rapid Cycling Synchrotron to Replace the CERN PS Booster injection, extraction, linac, lattice 2523
 
  • K. Hanke, O. Aberle, M. E. Angoletta, B. Balhan, W. Bartmann, M. Benedikt, J. Borburgh, D. Bozzini, C. Carli, P. Dahlen, T. Dobers, M. Fitterer, R. Garoby, S.S. Gilardoni, B. Goddard, J. Hansen, T. Hermanns, M. Hourican, S. Jensen, A. Kosmicki, L.A. Lopez Hernandez, M. Meddahi, B. Mikulec, A. Newborough, M. Nonis, S. Olek, M.M. Paoluzzi, S. Pittet, B. Puccio, V. Raginel, I. Ruehl, H.O. Schönauer, L. Sermeus, R.R. Steerenberg, J. Tan, J. Tückmantel, M. Vretenar, M. Widorski
    CERN, Geneva, Switzerland
  
  CERN’s proton injector chain is undergoing a massive consolidation and upgrade program in order to deliver beams meeting the needs of the LHC Luminosity Upgrade. As an alternative to the upgrade of the existing Proton Synchrotron Booster (PSB), the construction of a Rapid Cycling Synchrotron (RCS) has been studied. This machine would replace the PSB and deliver beams to the LHC as well as to CERN’s rich fixed-target physics program. This paper summarizes the outcome of the feasibility study along with a tentative RCS design.  
 
WEPS020 Study of an Energy Upgrade of the CERN PS Booster injection, power-supply, extraction, emittance 2526
 
  • K. Hanke, O. Aberle, M. E. Angoletta, W. Bartmann, S. Bartolome, C. Bertone, A. Blas, J. Borburgh, D. Bozzini, A.C. Butterworth, C. Carli, P. Dahlen, T. Dobers, A. Findlay, R. Folch, N. Gilbert, J. Hansen, T. Hermanns, S. Jensen, P. Le Roux, L.A. Lopez Hernandez, E. Mahner, A. Masi, B. Mikulec, Y. Muttoni, A. Newborough, D. Nisbet, M. Nonis, S. Olek, M.M. Paoluzzi, S. Pittet, B. Puccio, V. Raginel, I. Ruehl, J. Tan, B. Todd, W.J.M. Weterings, M. Widorski
    CERN, Geneva, Switzerland
  
  CERN’s LHC injector chain will have to deliver beams with ultimate brilliance as the LHC is heading for increased luminosity in the coming years. In order to overcome bottlenecks in the injector chain, an increase of the beam transfer energy from the CERN Proton Synchrotron Booster (PSB) to the Proton Synchrotron (PS) has been investigated as a possible upgrade scenario. This paper gives an overview of the technical solutions and summarizes the conclusions of the feasibility study.  
 
WEPS023 A Possible RF System for CERN RCS cavity, synchrotron, injection, extraction 2532
 
  • M.M. Paoluzzi
    CERN, Geneva, Switzerland
  
  As part of the LHC Injectors Upgrade (LIU) program at CERN the possibility of replacing the PSB with a new Rapid Cycling Synchrotron (RCS) is considered. The requirements in terms of accelerating voltage (60 kV), frequency range (1.7 MHz – 9.5 MHz) and available space (4 m) make the RF system development quite challenging. The improved loss characteristics of the new FINEMET® type (FT3L) combined with a filter-like topology, allows achieving all the requirements. This paper describes the design of such a RF system.  
 
WEPS101 Lattice Design of a RCS as Possible Alternative to the PS Booster Upgrade lattice, quadrupole, injection, space-charge 2745
 
  • M. Fitterer, M. Benedikt, H. Burkhardt, C. Carli, R. Garoby, B. Goddard, K. Hanke, H.O. Schönauer
    CERN, Geneva, Switzerland
  • A.-S. Müller
    KIT, Karlsruhe, Germany
  
  In the framework of the LHC Injectors Upgrade (LIU) a new rapid cycling synchrotron as alternative to the PS Booster has been proposed. In this paper we present the lattice constraints and requirement as well as the current status of the RCS lattice design and beam dynamics studies.  
 
WEPS103 Design of a Rapid Cycling Synchrotron for the Final Stage of Acceleration in a Common Proton Driver for a Neutrino Factory and a Spallation Neutron Source Based on Megawatt Upgrades to ISIS proton, target, neutron, acceleration 2751
 
  • J. Pasternak
    STFC/RAL, Chilton, Didcot, Oxon, United Kingdom
  • L.J. Jenner, J. Pasternak
    Imperial College of Science and Technology, Department of Physics, London, United Kingdom
  
  Potential upgrades to the ISIS accelerators at RAL in the UK to provide proton beams in the few GeV and few MW range could be envisaged as the starting point for a proton driver shared between a short pulse spallation neutron source and the Neutrino Factory. The accelerator chain for the spallation neutron source, consisting of an 800 MeV H− linac and a 3.2 GeV rapid cycling synchrotron (RCS), is currently being designed and optimised. The design of the RCS for the final stage of acceleration, which would increase the final beam energy of the dedicated pulses to feed the Neutrino Factory pion production target is presented. The feasibility of the final bunch compression to the necessary nanosecond range is also discussed.  
 
WEPS105 A Common Proton Driver for a Neutrino Factory and a Spallation Neutron Source Based on Megawatt Upgrades to ISIS proton, neutron, linac, injection 2757
 
  • J.W.G. Thomason
    STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom
  • J. Pasternak
    Imperial College of Science and Technology, Department of Physics, London, United Kingdom
  
  The Rutherford Appleton Laboratory (RAL) is home to ISIS, the world’s most productive spallation neutron source. Potential upgrades of the ISIS accelerators to provide beam powers of 2 – 5 MW in the few GeV energy range could be envisaged as the starting point for a proton driver shared between a short pulse spallation neutron source and the Neutrino Factory. The concept of sharing a proton driver between other facilities and the Neutrino Factory is an attractive, cost-effective solution which is already being studied in site-specific cases at CERN and FNAL. Although in the RAL case the requirements for the Neutrino Factory baseline proton energy and time structure are different from those for a spallation neutron source, an additional RCS or FFAG booster bridging the gap in proton energy and performing appropriate bunch compression seems feasible.  
 
THPC023 Third Generation Light Source Project in Iran dipole, emittance, lattice, radiation 2954
 
  • J. Rahighi, E. Salimi, R. safian
    IPM, Tehran, Iran
  • M. Jafarzadeh, Kh.S. Sarhadi
    ILSF, Tehran, Iran
  
  The Institute for Research in Fundamental Sciences (IPM) is in charge of the establishing the Iranian Light Synchrotron Source Facility (ILSF). This facility will be a 3rd generation 3 GeV storage ring with a circumference of roughly 300 m. The injector will consist of a 150 MeV Linac and a full energy booster synchrotron. The storage ring has a four-fold symmetry with 4 long (7.88m), 16 medium (4.0 m) and 12 short (2.8 m) straight sections. Within the medium straight section there are mini beta values in order to get an optimized flux density for the users. The emittance is in the range of 3 nmrad. The booster synchrotron has a circumference of roughly 192 m with an emittance of roughly 31 nmrad. It is a separated function machine in order to have the maximum flexibility. For both machine it is foreseen to use a 500 MHZ RF-system with normal conducting cavities. The machine will be build in an international collaboration, in which the main components have to be supplied from international market. The conceptual design report should be finished in 2012, the commissioning of the machine is expected to be in 2020.  
 
THPC025 Booster Design for ILSF synchrotron, storage-ring, dipole, electron 2960
 
  • H. Ghasem
    IPM, Tehran, Iran
  • E. Ahmadi
    ILSF, Tehran, Iran
  • D. Einfeld
    CELLS-ALBA Synchrotron, Cerdanyola del Vallès, Spain
  
  A full energy 3 GeV booster synchrotron has been designed to boost electron beam to the target energy of 3 GeV for the proposed third generation synchrotron light source (ILSF) that will be constructed in Iran. The primary goal of the ILSF booster is to design a synchrotron which can deliver a small emittance (ε<30 nm-rad), while at the same time has a low cost in construction. In order to design lattice for the booster, two configurations for booster have been considered. In the first configuration, booster is designed based on locating in a separate tunnel as 3 GeV storage ring inside the ring and in the second configuration, the booster is optimized for placing inner to the ring with one shared wall as service area of ILSF storage ring. Several types of lattice with various circumferences have been explored for the booster synchrotron in each configuration and this paper presents results of linear and nonlinear optimization of the main designed lattice for booster in both configurations.  
 
THPC027 Top-up Operational Experience at Elettra storage-ring, injection, radiation, controls 2966
 
  • E. Karantzoulis, A. Carniel, S. Krecic
    ELETTRA, Basovizza, Italy
  
  Since May 2010 Elettra, the third generation Italian light source, operates regularly for users at both 2 and 2.4 GeV in top-up. In this paper the experience during more than a year of operation in top-up at both user energies is discussed and the machine up time statistics presented and compared with the before top up period.  
 
THPC031 Measurement of Longitudinal Dynamics of Injected Beam in a Storage Ring injection, storage-ring, simulation, synchrotron 2978
 
  • T. Watanabe, T. Fujita, M. Masaki, K. Soutome, S. Takano, M. Takao, K. Tamura
    JASRI/SPring-8, Hyogo-ken, Japan
  
  Experimental observation of longitudinal dynamics of injected beam in a storage ring has been demonstrated. Since the injected beam undergoes synchrotron oscillation in a longitudinal phase space, two projected values, i.e., a bunch duration and an energy spread, oscillate at twice the synchrotron frequency. At SPring-8, the initial energy spread (~0.126%) at the injection goes up and down until it reaches the equilibrium energy spread (~0.11%). If the injection timing should not be optimized, an asymmetrically enhanced oscillation could distort the injection efficiency. The observation of such an oscillation helps make sure that no significant injection loss occurs. More importantly, the scheme is expected to enable us to observe non-linear longitudinal dynamics of ultra-short bunches injected from the XFEL linac; the bunches are in near future going to be transferred from the linac to the storage ring via 600-meter long transports, in which strong coherent synchrotron radiation and other high peak-current effects will not be ignorable. Experimental results obtained by a dual-scan streak camera and other devices as well as numerical simulations will be presented.  
 
THPC037 Accelerators of the Central Japan Synchrotron Radiation Facility Project (II) storage-ring, synchrotron, electron, linac 2987
 
  • N. Yamamoto, M. Hosaka, A. Mano, H. Morimoto, K. Takami, Y. Takashima
    Nagoya University, Nagoya, Japan
  • Y. Hori
    KEK, Ibaraki, Japan
  • M. Katoh
    UVSOR, Okazaki, Japan
  • S. Koda
    SAGA, Tosu, Japan
  • S. Sasaki
    JASRI/SPring-8, Hyogo-ken, Japan
  
  Central Japan Synchrotron Radiation (SR) Facility Project is making progress for the service from FY2012. The construction of SR building is almost completed in the Aichi area of Japan, and the installs of accelerators will start in a few week. The key equipments of our accelerators are an 1.2 GeV compact electron storage ring that is able to supply hard X-rays and a full energy injector for top-up operation. The beam current and natural emittance of the storage ring are 300 mA and 53 nmrad. The circumference is 72 m. The magnetic lattice consists of four triple bend cells and four straight sections. The bending magnets at the centers of the cells are 5 T superconducting magnets and the critical energy of the SR is 4.8 keV. The injector consists of a 50 MeV linac and a booster synchrotron with the circumference of 48 m. To save construction expenses, the injector is built at inside of the storage ring. More than ten hard X-ray beam-line can be constructed. One variable polarization undulator will be installed in the first phase. The top-up operation will be introduced as early as possible.  
 
THPC043 Status of SESAME Project vacuum, EPICS, controls, quadrupole 2999
 
  • A. Nadji
    SESAME, Amman, Jordan
  
  This paper reports on the progress which has been made on the construction of the SESAME accelerator complex. The construction of the shielding wall has been finished on March 2011. According to plan, the preparation works and tenders of the conventional facilities have been launched such as the cooling system, electrical distribution systems, PSS system and so on. The commissioning of the Microtron at full energy and the installation of the booster are the next millstones to accomplish. The booster upgrade plan has started which consists of replacing all bending magnets vacuum chamber with new one, BPM Libera Electronics, new control system based on EPICS, new timing system, new electronics for tune measurement. The site acceptance test of the new power supplies of the booster with their tracking electronics is planned to take place in July 2011. The magnet system of the storage ring has been reviewed and the manufacturing tendering is foreseen before the end of 2011.  
 
THPC057 Operation of the ALBA Injector linac, emittance, injection, storage-ring 3023
 
  • M. Pont, U. Iriso, R. Muñoz Horta, F. Pérez
    CELLS-ALBA Synchrotron, Cerdanyola del Vallès, Spain
  
  The ALBA injector made of a 100 MeV linac, operating at 110 MeV, and a full energy (3 GeV) booster synchrotron has been routinely in operation since October 2010. The stability of the linac and of the booster on reliability and performance is examined. Also results on the beam performance obtained with the installed diagnostic equipment will be discussed.  
 
THPC066 A Study of Emittance Growth in a Photoinjector Linac by using PWT as Pre-accelerator linac, emittance, solenoid, focusing 3044
 
  • A. Sadeghipanah, S.B. Hung, W.K. Lau, A.P. Lee
    NSRRC, Hsinchu, Taiwan
  • N.Y. Huang
    NTHU, Hsinchu, Taiwan
  
  The NSRRC high brightness photoinjector for light source R&D is a 2998 MHz split configuration. Our goal is to produce 1 nC bunch charge from a photo-cathode rf gun with normalized emittance of 1 mm-mrad or less. However, limited by the available power from our klystron, previous studies showed that our linac has to be equipped with focusing solenoid to help emittance control during acceleration. In order to omit the bulky focusing solenoid from the booster linac system, we considered to use two high gradient (~26 MV/m) PWT standing-wave structures to accelerate the beam previous to the linac. Studies showed that this configuration can keep the emittance as low as 1 mm-mrad while also decreasing the energy spread to half of its initial amount. The only drawback is the growth of final beam radius, which can be compensated by using a setting of quadrupole magnets.  
 
THPC069 Studies to Optimize the Diamond Light Source Booster Synchrotron as a 100 MeV Storage Ring quadrupole, synchrotron, storage-ring, linac 3053
 
  • C. Christou, M.T. Heron, J. Rowland
    Diamond, Oxfordshire, United Kingdom
  • S. Gayadeen
    University of Oxford, Oxford, United Kingdom
  
  The injection chain for the Diamond Synchrotron Light Source consists of a 100 MeV Linac and 3 GeV booster synchrotron. These were commissioned in 2005 and 2006 respectively, and have provided acceptable performance as an injector since then. To advance a programme of work in evaluating and optimizing new control algorithms for orbit stability on the Diamond Storage Ring it was decided to use the booster synchrotron as a test platform by operating it in DC mode at 100 MeV. In support of this work and to improve the operational performance of the booster a series of studies have been carried out to better understand and characterize it. This work and the results will be presented.  
 
THPC108 Commissioning of the 50 MeV Preinjector Linac for the BESSY II Facility linac, emittance, radiation, injection 3140
 
  • T. Atkinson, M. Helmecke, D. Schüler, E. Weihreter
    HZB, Berlin, Germany
  • V. Dürr
    BESSY GmbH, Berlin, Germany
  • D. Jousse, J.-L. Pastre, A.S. Setty
    THALES, Colombes, France
  
  A turn key 50MeV linac manufactured by Thales has been installed in the BESSY II facility. This linac will replace the existing Microtron injector in the near future to provide more flexible bunch population patterns for the femto-slicing operation mode and a higher single bunch intensity for top-up injection. This paper describes the essential problems which have been faced during commissioning and presents the main results obtained in the site acceptance tests including the measurement of beam emittance and energy spread.  
 
THPC113 Slice Emittance Measurements for Different Bunch Charges at PITZ emittance, laser, solenoid, electron 3149
 
  • Ye. Ivanisenko, H.-J. Grabosch, M. Gross, L. Hakobyan, G. Klemz, M. Krasilnikov, M. Mahgoub, D. Malyutin, A. Oppelt, M. Otevřel, B. Petrosyan, D. Richter, S. Rimjaem, A. Shapovalov, F. Stephan, G. Vashchenko, S. Weidinger
    DESY Zeuthen, Zeuthen, Germany
  • G. Asova
    INRNE, Sofia, Bulgaria
  • I.I. Isaev
    MEPhI, Moscow, Russia
  • M.A. Khojoyan
    YerPhI, Yerevan, Armenia
  • I.H. Templin, I. Will
    MBI, Berlin, Germany
  
  The successful operation of the Free electron LASer in Hamburg (FLASH) at DESY brings up the interest in further broadening the spectrum of possible applications also for the upcoming European XFEL. Hence the electron beam properties required for lasing should be tested and optimized for a broad range of values already on the level of the injector. The Photo Injector Test facility in Zeuthen (PITZ) at DESY characterizes the photo injectors for FLASH and the European XFEL. The main study involves the transverse projected emittance optimization for different beam conditions. Beside the projected emittance, the PITZ setup allows to measure the transverse emittance with a sub-bunch longitudinal resolution. This slice emittance diagnostics is based on the usage of bunches with an energy correlation of the longitudinal phase space components induced by the booster. Then the bunch is swept vertically with a dipole magnet. Part of the bunch that corresponds to a longitudinal slice is cut out by means of a vertical slit and the horizontal emittance is measured. This report presents the results of recent slice emittance measurements for different bunch charges.  
 
THPC114 High Brightness Photo Injector Upgrade and Experimental Optimization at PITZ emittance, laser, electron, gun 3152
 
  • M. Krasilnikov, H.-J. Grabosch, M. Gross, Ye. Ivanisenko, G. Klemz, W. Köhler, M. Mahgoub, D. Malyutin, A. Oppelt, M. Otevřel, B. Petrosyan, S. Rimjaem, F. Stephan, G. Vashchenko, S. Weidinger, R.W. Wenndorff
    DESY Zeuthen, Zeuthen, Germany
  • G. Asova
    INRNE, Sofia, Bulgaria
  • L. Hakobyan, M.A. Khojoyan
    YerPhI, Yerevan, Armenia
  • M. Hoffmann, H. Schlarb
    DESY, Hamburg, Germany
  • I.I. Isaev, A. Shapovalov
    MEPhI, Moscow, Russia
  • M.A. Nozdrin
    JINR, Dubna, Moscow Region, Russia
  • D. Richter
    HZB, Berlin, Germany
  • I.H. Templin, I. Will
    MBI, Berlin, Germany
  
  The photo injector test facility at DESY in Zeuthen (PITZ) develops and optimizes electron sources for linac driven free electron lasers. The main goal of PITZ is to demonstrate a small electron beam emittance by tuning several main parameters of the injector - photo cathode laser pulse, rf gun with solenoids and booster cavity parameters. A slit scan technique is used to measure the transverse phase space of the electron beam and the projected normalized emittance. The photo injector is capable of pulse train production which can be measured with dedicated diagnostics at PITZ. This enables optimization of the beam emittance for a wide range of bunch charges from tens of pC to several nC while keeping high resolution of beam measurements. The results of the experimental optimization will be presented yielding a new benchmark of photo injector performance.  
 
THPC115 Emittance Optimization for Different Bunch Charges with Upgraded Setup at PITZ emittance, laser, gun, electron 3155
 
  • G. Vashchenko, G. Asova, M. Gross, L. Hakobyan, I.I. Isaev, Ye. Ivanisenko, M.A. Khojoyan, M. Krasilnikov, M. Mahgoub, D. Malyutin, M. Otevřel, B. Petrosyan, S. Rimjaem, A. Shapovalov, F. Stephan, S. Weidinger
    DESY Zeuthen, Zeuthen, Germany
  • M.A. Nozdrin
    JINR, Dubna, Moscow Region, Russia
  • D. Richter
    HZB, Berlin, Germany
  • I.H. Templin, I. Will
    MBI, Berlin, Germany
  
  The Photo Injector Test facility at DESY, Zeuthen site, (PITZ) has the aim to develop and optimize high brightness electron sources for Free Electron Lasers like FLASH and the European XFEL. Photo electrons emitted from the Cs2Te cathode are accelerated by a 1.6-cell L-band RF gun cavity operated at 60 MV/m maximum accelerating gradient at the cathode. Cylindrically shaped laser pulses with a flat-top temporal profile of about 20 ps FWHM and 2 ps rise and fall time are used to produce electron beams with extremely low emittance. The PITZ beam line was upgraded in 2010. The new gun cavity (prototype number 4.1) was installed January 2010. The new booster cavity (CDS) with well-defined field distribution was installed in July 2010. The diagnostic system for characterization of the laser hitting the photocathode was upgraded in October 2010. Emittance measurements results for different charges: 2 nC, 1 nC, 0.25 nC, 0.1 nC and 0.02 nC, will be presented. The optimization was done for different parameters, e.g. gun solenoid current, gun phase, laser spot size on the cathode, booster gradient.  
 
THPC137 Low Emittance Booster Design for CANDLE Storage Ring emittance, injection, storage-ring, synchrotron 3209
 
  • G.S. Zanyan, B. Grigoryan, K. Manukyan, A. Sargsyan, V.M. Tsakanov
    CANDLE, Yerevan, Armenia
  
  The progress in synchrotron based research made the top up operation mode of storage rings as the most attractive option both from the beam lifetime and the user points of view. To provide reliable operation of the facility at top-up injection mode the full energy low emittance new booster ring for 3 GeV CANDLE storage ring is designed. The compact synchrotron magnets with integrated quadrupole and sextupole components are used. The new design provides 20 nm emittance at the top energy with sufficient dynamic aperture and optimal optical properties at straight section for effective extraction. The complete design of the new booster and beam dynamics issues during the energy ramping are presented.  
 
THPO001 Design Power Supply Considerations to Compensate Booster Power Supply Effects on the SOLEIL Storage Ring power-supply, storage-ring, controls, dipole 3335
 
  • J.-P. Lavieville, R. Ben El Fekih, S. Bobault, D. Muller, L.S. Nadolski
    SOLEIL, Gif-sur-Yvette, France
  
  Top-up injection mode has been routinely in operation since March 2009 for various bunch filling patterns at Synchrotron SOLEIL. The electron beam stored current is maintained within 1%. At each injection the 3 Hz booster power supplies are ramped up and down over 10 seconds every 3 minutes in average. During this time DC and AC perturbations are observed on the storage ring horizontal closed orbit. Typically, the beamline source points can be shifted up to 10-20 μm and the amplitude of the 3Hz frequency is multiplied by a factor 9. The origin of these perturbations lies in the imperfect compensation of the magnet currents circulating along the booster ring located inside the storage ring. To compensate these disturbances, a wire loop was installed in the booster cable tray fed by an in-house developed power supply. Its output current is driven by direct measurement of the main currents of the booster dipole, quadrupole, sextupole power supplies with a proper amplitude and phase shift. This paper presents the determination of the compensation needs according to beam measurements, the original design and the performance reached when this power supply is acting.  
 
THPO019 TPS Fast Corrector Magnet Power Converter feedback, power-supply, controls, monitoring 3379
 
  • Y.D. Li, K.-B. Liu
    NSRRC, Hsinchu, Taiwan
  
  With the increasing demand of the current output accuracy on the TPS(Taiwan Photon Source) project, the MCOR 30 correction power supplies used in current TLS ring are no longer sufficient to meet the TPS requirement. Therefore, power supply group developments a high-precision low output current power supply with a DCCT as an output current feedback component for correction magnets of the future TPS ring. During the research and development experiment phase, we found the DCCT is more possible damaged than the other components. With keeping the architecture of the high-precision low output current power supply, but the DCCT output current feedback component is replaced with a current sensing Shunt resistor. This paper will discuss the design methods of utilizing several different types current sensing Shunt resistor to reduce the cost of power supply and the probability of damage, and improve frequency response of power supply.  
 
THPO020 TPS Digital Corrector Magnet Power Converter based on FPGA feedback, controls, dipole, quadrupole 3382
 
  • Y.D. Li, Y.-C. Chien, K.-B. Liu
    NSRRC, Hsinchu, Taiwan
  
  This thesis presents the design and implementation of a FPGA-based fully digital-controlled programmable power supply.  
 
THPS046 Transport Beam Lines for NICA Accelerator Complex collider, ion, quadrupole, lattice 3526
 
  • O.S. Kozlov, A.V. Eliseev, I.N. Meshkov, V.A. Mikhailov, A.O. Sidorin, N.D. Topilin, G.V. Trubnikov, A. Tuzikov
    JINR, Dubna, Moscow Region, Russia
  
  In the last years Nuclotron-based Ion Collider fAcility (NICA) project is being developed by Joint Institute for Nuclear Research (JINR), Dubna, Russia. The goal of the project is to construct new accelerator complex that will be used for colliding ion beams on first stage and colliding polarized proton/deuteron beams on second stage of the project. NICA accelerator complex will consist of two linear accelerators, two superconducting synchrotrons, two superconducting storage rings of the collider and transport beamlines. Geometry and magnetic system of NICA beamlines are presented in this report. Results of beam dynamics simulations within the beamlines are considered.  
 
THPS067 The TOP-IMPLART Project proton, DTL, klystron, site 3580
 
  • C. Ronsivalle, M.C. Carpanese, G. Messina, L. Picardi, S. Sandri
    ENEA C.R. Frascati, Frascati (Roma), Italy
  • M. Benassi, L. Strigari
    IFO, Roma, Italy
  • E. Cisbani, S.F. Frullani, V. Macellari
    ISS, Rome, Italy
  • C. Marino
    ENEA Casaccia, Roma, Italy
  
  The TOP-IMPLART project, developed by ENEA, the Italian National Institute of Health (ISS) and Regina Elena National Cancer Institute-IFO-Rome is devoted to the realization of a proton therapy centre to be sited at IFO, based on a sequence of linear accelerators and designed with three treatment rooms: one with a 150 MeV beam for shallow tumors and two with a 230 MeV beam for deep tumors. The first part of the acronym remarks the heritage from the TOP Project developed in 1998-2005 by ISS and ENEA, whilst the second part (“Intensity Modulated Proton Linear Accelerator for RadioTherapy”) exploits the possibility to perform a highly conformational therapy based on spatial and intensity modulation of the beam. The segment up to 150 MeV, funded by the Italian “Regione Lazio” for 11M€ over four years, is under installation at ENEA-Frascati for its validation before the transfer to IFO. The low energy part is also used as a facility for radiobiology experiments in the framework of a satellite program foreseeing cells irradiation at 7 MeV with a vertical and horizontal beam and small animal irradiation with a 17.5 MeV horizontal beam. The status of the Project is presented.