Keyword: storage-ring
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MOODS2 Nonlinear Resonance Measurements and Correction in Storage Rings resonance, betatron, sextupole, dipole 88
 
  • R. Bartolini
    Diamond, Oxfordshire, United Kingdom
  
  Several theoretical and experimental techniques have been developed in recent years to correct the detrimental effect of nonlinear resonances on dynamic aperture, beam lifetime, injection efficiency and beam loss distribution. These issues are equally important in synchrotron light sources and high energy colliders. We present the latest theoretical and experimental results obtained at the Diamond light source on the characterization of the nonlinear resonances and on the comparison between the nonlinear model of the machine to the real accelerator.  
slides icon Slides MOODS2 [3.159 MB]  
 
MOP166 Comissioning of a BPM system for the LNLS Booster to Storage Ring Transfer Line injection, booster, controls, monitoring 405
 
  • F.H. Cardoso, S.R. Marques, X.R. Resende
    LNLS, Campinas, Brazil
  
  In order to increase the number of diagnostics and make possible studies of beam position effects in the injection efficiency, a beam position monitoring system was designed to equip the BTS (booster to storage ring) transfer line employing the long striplines BPMs. The log-ratio technique was applied using a commercial electronics module (LR-BPM) from Bergoz Instrumentation. Currently the system is integrated to the LNLS control system, database and ready to be used routinely during the injections. This work describes the system topology, details about the hardware and software, bench tests and measurements performed with electron beam. Future plans to improve the injection efficiency will also be presented.  
 
MOP170 Combining Multiturn and Closed-Orbit Methods for Model-Independent and Fast Determination of Optical Functions in Storage Rings closed-orbit, betatron, dipole, synchrotron 411
 
  • B. Riemann, P. Grete, H. Huck, A. Nowaczyk, T. Weis
    DELTA, Dortmund, Germany
  
  Multiturn / turn-by-turn data acquisition is a new source for Twiss parameter determination in storage rings, while closed-orbit measurements are a long-known tool for diagnostics with conventional low-frequency beam position monitor (BPM) systems, being available at almost every storage ring. The presented method aims to join the advantages of multiturn and closed-orbit measurement methods. For uncoupled optics, there are only two correctors per oscillation plane and two multiturn BPMs needed in one drift space in the storage ring for model-independent measurement of beta and betatron phase functions at all BPMs in the ring, including conventional ones. This is a cost-effective alternative to the exclusive usage of multiturn BPMs in a storage ring, resulting in the same amount of information. This method can also be extended to include betatron coupling. In addition, we describe a possible experimental setup needed for multiturn data acquisition using a bunch-by-bunch feedback system. By applying an uncritical coherent excitation to coupled bunch modes, the accuracy of the multiturn data acquisition may be significantly improved, enabling the use of smaller drift spaces.  
 
MOP174 The Study and Implementation of Signal Processing Algorithm for Digital Beam Position Monitor brilliance, betatron, extraction, injection 414
 
  • L.W. Lai, Z.C. Chen, Y.B. Leng, Y.B. Yan, G.S. Yang
    SSRF, Shanghai, People's Republic of China
  • X. Yi
    SINAP, Shanghai, People's Republic of China
  
  Digital beam position monitor (DBPM) system is one of the most important beam diagnostic instruments generally used in modern accelerators. The performance of DBPM is mainly given by its digital signal processing algorithm. In order to find out a better solution for our new DBPM system, two algorithms have been designed and implemented on a commercial FPGA based DAQ module (ICS1554) to retrieve the turn-by-turn (TBT) data. The first algorithm is based on frequency mixing, and the second one on discrete Fourier transform (DFT). Laboratory tests show that the standard deviation of measured positions can be better than 1μm at 5 dBm with input signal stronger than 5 dBm for both algorithms. And on-line evaluation indicates that real beam motion can be observed correctly using either algorithm.  
 
MOP183 First Measurements of a New Beam Position Processor on Real Beam at Taiwan Light Source brilliance, injection, betatron, controls 429
 
  • P. Leban, A. Košiček
    I-Tech, Solkan, Slovenia
  • P.C. Chiu, K.T. Hsu, K.H. Hu, C.H. Kuo
    NSRRC, Hsinchu, Taiwan
  
  Libera Electron, Libera Brilliance and Libera Brilliance+ compose the electron beam position processors product family, which covers the needs of wide variety of the circular light source machines. The instruments deliver unprecedented possibilities for either building powerful single station solutions or architecting complex feedback systems. Compared to its predecessors (Libera Electron and Libera Briliance), the latest member of the family Libera Brilliance+ allows even more extensive machine physics studies to be conducted due to large data buffers and the new true turn-by-turn position calculation. It offers a large playground for custom- written applications with VirtexTM 5 and COM Express Basic module with Intel Atom N270 (x86) inside. First field tests of the new product were performed on real beam at Taiwan Light Source (TLS). The test setup, measurements and results are discussed in the paper.  
 
MOP186 Low Energy Beam Diagnostics Developments within DITANET ion, diagnostics, instrumentation, target 438
 
  • C.P. Welsch
    Cockcroft Institute, Warrington, Cheshire, United Kingdom
  • C.P. Welsch
    The University of Liverpool, Liverpool, United Kingdom
  
  Funding: Work supported by the EU under contract PITN-GA-2008-215080.
Low energetic ion beam are very attractive for a large number of fundamental physics experiments. The development of beam instrumentation for such beams poses many challenges due to the very low currents down to only a few thousands of particles per second and the resulting very low signal levels. Within DITANET, several institutions aim at pushing low energy, low intensity diagnostics beyond the present state-of-the-art. This contribution gives examples from the progress across the DITANET network in this research area.
On behalf of the DITANET consortium. 		 
 
MOP193 Design of Visible Diagnostic Beamline for NSLS2 Storage Ring radiation, synchrotron, diagnostics, electron 453
 
  • W.X. Cheng, H.C. Fernandes, H.-C. Hseuh, B.N. Kosciuk, S. Krinsky, O. Singh
    BNL, Upton, Long Island, New York, USA
  
  A visible synchrotron light monitor (SLM) beam line has been designed at the NSLS2 storage ring, using the bending magnet radiation. A retractable thin absorber will be placed in front of the first mirror to block the central x-rays. The first mirror will reflect the visible light through a vacuum window. The light is guided by three 6" diameter mirrors into the experiment hutch. In this paper, we will describe design work on various optical components in the beamline.  
 
MOP211 NSLS-II RF Beam Position Monitor controls, feedback, injection, EPICS 495
 
  • K. Vetter, J.H. DeLong, A.J. Della Penna, K.M. Ha, Y. Hu, B.N. Kosciuk, J. Mead, I. Pinayev, O. Singh, Y. Tian
    BNL, Upton, Long Island, New York, USA
  • G.J. Portmann
    LBNL, Berkeley, California, USA
  • J.J. Sebek
    SLAC, Menlo Park, California, USA
  
  Funding: Work supported by the U.S. DOE under contract No. DE-AC02-98CH10886.
An internal R&D program has been undertaken at BNL to develop a sub-micron RF Beam Position Monitor (BPM) for the NSLS-II 3rd generation light source that is currently under construction. The BPM R&D program started in August 2009. Successful beam tests were conducted 15 months from the start of the program. The NSLS-II RF BPM has been designed to meet all requirements for the NSLS-II Injection system and Storage Ring. Housing of the RF BPMs in ±0.1C thermally controlled racks provide sub-micron stabilization without active correction. An active pilot-tone has been incorporated to aid long-term (8hr min) stabilization to 200nm RMS. 		 
 
MOP215 Digital Tune Tracker for CESR betatron, lattice, electron, resonance 504
 
  • R.E. Meller, M.A. Palmer
    CLASSE, Ithaca, New York, USA
  
  Funding: Work supported by the DOE through DE-FC02-08ER41538 and the NSF through PHY-0734867.
Numerous storage ring diagnostic operations require synchronous excitation of beam motion. An example is the lattice phase measurement, which involves synchronous detection of the driven betatron motion. In the CESR storage ring, the transverse tunes continuously vary by several times their natural width. Hence, synchronous beam excitation is impossible without active feedback control. The digital tune tracker consists of a direct digital frequency synthesizer which drives the beam through a transverse kicker, and is phase locked to the detected betatron signal from a quad button position detector. This ensures synchronous excitation, and by setting the correct locking phase, the excitation can be tuned to peak resonance. The fully digital signal detection allows a single bunch amid a long train to be synchronously driven, which allows lattice diagnostics to be performed which include collective effects. The collective effects potentially of interest in CESR include wakefield couplings within the train, and plasma effects such as ion trapping and electron cloud trapping. 		 
 
MOP263 Fast Orbit Feedback System for the LNLS Storage Ring feedback, controls, synchrotron, injection 597
 
  • L. Sanfelici, F.H. Cardoso, D.D. Felix Ferreira, S.R. Marques, D.O. Tavares
    LNLS, Campinas, Brazil
  
  The Brazilian Synchrotron Light Laboratory (LNLS) is based on a 1.37 GeV storage ring, previously operated by means of a Slow Orbit Feedback System at a maximum rate of 1 correction every 3 seconds. Since photon flux stability is a key issue for light source users, a faster control system was envisaged to provide better beam stability. This work presents an overview of the hardware architecture and the preliminary results achieved with the implementation of a Fast Orbit Feedback System using commercial hardware. BPM signals are acquired in a distributed topology and sent through a deterministic EtherCAT network to a PXI controller, responsible for applying the SVD-based correction matrix multiplication and communicating with the accelerator control system; the calculated current setpoints are sent to the correctors’ power supplies through a second EtherCAT network. FPGA-based acquisition and actuation chassis perform pre-filtering and control on the digitized input and output signals, respectively.  
 
MOP269 Design of Longitudinal Feedback Kicker for HLS Storage Ring kicker, cavity, impedance, vacuum 612
 
  • W. Xu, D.H. He
    USTC/NSRL, Hefei, Anhui, People's Republic of China
  • W. Wu, Y.K. Wu
    FEL/Duke University, Durham, North Carolina, USA
  
  Hefei Light Source (HLS) is a dedicated synchrotron radiation research facility. It is now undergoing a major upgrade. To obtain a better performance of the light source, a longitudinal feedback system will be developed as part of the upgrade project to cure the coupled bunch mode instabilities. In this work, we present a design of the LFB kicker, a waveguide overloaded cavity with two input and two output ports. The cavity design specifications include a central frequency of 969 MHz (4.75 RF frequency), a bandwidth of more than 100 MHz, and a high shunt impedance of 1200 Ω. A study is carried out to find the dependence of the cavity performance on a few critical geometric parameters of the cavity. Since the shape of the vacuum chamber of the HLS storage ring is octagon, a transition from a circular vacuum chamber to an octagon one is built into the end pieces of the cavity to minimize the total cavity length. To lower the required amplifier power, the structure is optimized to obtain a high shunt impedance. The higher order modes of the kicker cavity are also considered during the design.  
 
MOP272 Radiation Dose Level in the SSRF during Normal Operation radiation, monitoring, neutron, injection 615
 
  • X.J. Xu, P. Fei, R. Qin, W. Shen, X. Xia, D. Zhang, J.Z. Zhou
    SINAP, Shanghai, People's Republic of China
  
  Shanghai Synchrotron Radiation Facility (SSRF) has been commissioned since December 2007, and has been formally operated since May 2009. In order to ensure the radiation safety for staff members and publics, the radiation levels of the workplace, the environment and the staff are monitored through a real-time network of gamma and neutron monitors as well as through TLD passive dosimeters. This paper reports the results of the radiation monitoring. From these results, we found that the annual dose equivalents were good to meet the management values of SSRF.  
 
MOP276 Applying Cascaded Parameter Scan to Study Top-off Safety in NSLS-II Storage Ring injection, simulation, photon, interlocks 627
 
  • Y. Li, S.V. Badea, W.R. Casey, G. Ganetis, R. Heese, H.-C. Hseuh, P.K. Job, S. Krinsky, B. Parker, T.V. Shaftan, S.K. Sharma, L. Yang
    BNL, Upton, Long Island, New York, USA
  
  Funding: Work supported by U.S. DOE, Contract No. DE-AC02-98CH10886
In this paper we introduce a new algorithm, the cascaded parameter scan method, to efficiently carry out the scan over magnet parameters in the safety analysis for the NSLS-II top-off injection. In top-off safety analysis, one must track particles populating phase space through a beamline containing magnets and apertures and clearly demonstrate that for all possible magnet settings and errors, all particles are lost on scrapers within the properly shielded region. In the usual approach, the number of tracking runs increases exponentially with the number of magnet settings. In the cascaded parameter scan method, the number of tracking runs only increases linearly. This reduction of exponential to linear dependence on the number of setpoints, greatly reduces the required computation time and allows one to more densely populate phase space and to increase the number of setpoints scanned for each magnet. An example of applying this approach to analyze an NSLS-II beamline, the damping wiggler beamline, is also given. 		 
 
MOP295 The Low-level Radio Frequency System for the Superconducting Cavities of National Synchrotron Light Source II LLRF, cavity, controls, SRF 669
 
  • H. Ma, J. Cupolo, B. Holub, J. Oliva, J. Rose, R. Sikora, M. Yeddulla
    BNL, Upton, Long Island, New York, USA
  
  Funding: US DOE
A digital low-level radio frequency (LLRF) field controller has been developed for the storage ring of The National Synchrotron Light Source-II (NSLS-II). The primary performance goal for the LLRF is to support the required RF operation of the superconducting cavities with a beam current of 500mA and a 0.14 degree or better RF phase stability. The digital field controller is FPGA-based, in a standard format 19”/1-U chassis. It has an option of high-level control support with MATLAB running on a local host computer through a USB2.0 port. The field controller has been field tested with the high-power superconducting RF (SRF) at Canadian light Source, and successfully stored a high beam current of 250 mA. The test results show that required specifications for the cavity RF field stability are met. This digital field controller is also currently being used as a development platform for other functional modules in the NSLS-II RF systems. 		 
 
TUOBS3 Status of the NSLS-II Project vacuum, injection, radiation, photon 732
 
  • F.J. Willeke
    BNL, Upton, Long Island, New York, USA
  
  NSLS-II, the new 3 GeV 3rd generation light source presently under construction at Brookhaven National Laboratory will provide ultra-bright synchrotron radiation of 1021 photons s-1 mm-2 mrad-2 0.1% BW-1 at 2keV and high photon flux of 1015 photons s-1 0.1% BW-1. The facility will support a minimum of 60 beamlines. Construction started in 2009 and commissioning is expected to be completed in 2014. This report will provide a description of the NSLS-II design and will summarize the status of the construction project.  
slides icon Slides TUOBS3 [7.560 MB]  
 
TUOBS4 Challenge of MAX IV Towards a Multi-Purpose Highly Brilliant Light Source linac, emittance, lattice, vacuum 737
 
  • M. Eriksson, J. Ahlbäck, Å. Andersson, M.A.G. Johansson, D. Kumbaro, S.C. Leemann, C. Lenngren, P. Lilja, F. Lindau, L.-J. Lindgren, L. Malmgren, J.H. Modéer, R. Nilsson, M. Sjöström, J. Tagger, P.F. Tavares, S. Thorin, E.J. Wallén, S. Werin
    MAX-lab, Lund, Sweden
  • B. Anderberg
    AMACC, Uppsala, Sweden
  • L.O. Dallin
    CLS, Saskatoon, Saskatchewan, Canada
  
  A design study of the MAX-IV light source complex in Sweden has been completed. One of MAX-IV's main light sources, a 3 GeV storage ring, is designed to achieve a natural emittance of ~0.2 nm rad. The facility will also provide SASE-XFEL using a 3 GeV high performance linear accelerator. The speaker will discuss facility targets, the concept and accelerator design, and show some possibilities approaching two-dimensional diffraction-limited X-ray generation at MAX-IV.  
slides icon Slides TUOBS4 [6.719 MB]  
 
TUOCS4 Upgrade of Accelerator Complex at Pohang Light Source Facility (PLS-II) emittance, linac, vacuum, insertion 772
 
  • K.R. Kim, H.-S. Kang, C. Kim, D.E. Kim, S.H. Kim, S.-C. Kim, H.-G. Lee, J.W. Lee, S.H. Nam, C.D. Park, S.J. Park, S. Shin
    PAL, Pohang, Kyungbuk, Republic of Korea
  
  Funding: This upgrade project of PLS-II is supported by MEST, in Korea
In order to meet the domestic Korean synchrotron user’s requirements demanding high beam stability and extended photon energies, PLS-II upgrade program has been launched in January 2009 through a 3-year project plan. PLS-II storage ring is newly designed a modified achromatic version of Double Bend Achromat (DBA) to achieve almost twice as many straight sections as the current PLS (TBA) with a design goal of the natural emittance of 5.8 nm·rad, 3.0 GeV beam energy and 400 mA beam current. In the PLS-II, the top-up injection using full energy linac of 3.0 GeV beam energy will be routinely operated for higher stable photon beam as well and therefore the production of hard x-ray undulator radiation of 8 to13 keV is anticipated to allow for more competitive scientific research activities namely x-ray bio-imaging and protein crystallography. 		 
slides icon Slides TUOCS4 [17.914 MB]  
 
TUOCS6 An VUV FEL for Producing Circularly Polarized Compton Gamma-ray Beams in the 70 to 100 MeV Region FEL, wiggler, electron, cavity 778
 
  • Y.K. Wu, J.Y. Li, S.F. Mikhailov, V. Popov, G. Swift, P.W. Wallace, W. Wu
    FEL/Duke University, Durham, North Carolina, USA
  • S. Huang
    PKU/IHIP, Beijing, People's Republic of China
  
  Funding: This work is supported in part by the US DOE grant no. DE-FG02-97ER41033.
Recently, the Duke optical klystron FEL (OK-5 FEL) has been commissioned to produce lasing in the VUV region (191 - 193 nm), overcoming substantial laser cavity loss due to low reflectivity of the VUV FEL mirrors. With two OK-5 FEL wigglers separated by more than 20 meters in a non-optimal configuration, an adequate FEL gain was realized by operating the Duke storage ring with a high single-bunch current (30 to 50 mA). This VUV FEL has enabled us to produce circularly polarized Compton gamma-ray beams in the 70 to 100 MeV region at the High Intensity Gamma-ray Source (HIGS), Duke University. This high energy gamma-ray beam capability will create new opportunities for both fundamental and applied research at HIGS. In this work, we report our experience of VUV FEL lasing with a high single-bunch current and first production of gamma-ray beams in the 70 to 100 MeV region. 		 
slides icon Slides TUOCS6 [2.768 MB]  
 
TUOCS7 Design of an Ultimate Storage Ring for Future Light Source emittance, resonance, FEL, dynamic-aperture 781
 
  • Y.C. Jing, S.-Y. Lee
    IUCEEM, Bloomington, Indiana, USA
  • P.E. Sokol
    IUCF, Bloomington, Indiana, USA
  
  Ultimate storage ring (USR) with natural emittance comparable to diffractive limit is becoming a compatible candidate for next generation hard X-ray light source. When FEL technique is employed, it can deliver a high quality beam with very high brightness compared to 3rd generation light sources and transverse coherence which facilitates the power growth. In this paper, we propose a design of a 5GeV USR with emittance at 10pm for both planes. A lattice of nBA type is used and combined function magnet is employed to make a compact storage ring.  
slides icon Slides TUOCS7 [1.746 MB]  
 
TUODN4 Dynamic Aperture Optimization using Genetic Algorithms lattice, dynamic-aperture, sextupole, emittance 793
 
  • C. Sun, H. Nishimura, D. Robin, C. Steier, W. Wan
    LBNL, Berkeley, California, USA
  
  Genetic Algorithm is successfully applied to optimize dynamic aperture of lattices for ALS future upgrades. It is demonstrated that the optimization using total diffusion rate as objective has a better performance than the one using dynamic aperture area. The linear and non-linear properties of the lattice are optimized simultaneously, and trade-offs are found among the small emittance, low-beta function and large dynamic aperture. These trade-offs can provide us a guideline to choose a candidate lattice for ALS future upgrades.  
slides icon Slides TUODN4 [1.781 MB]  
 
TUP013 A Concept Design of a Compton Scattering Light Source based on the HLS Electron Storage Ring electron, laser, photon, scattering 835
 
  • X.C. Lai, H. Hao, H.Q. Huang, W.W. Li, X.Q. Wang, D.R. Xu
    USTC/NSRL, Hefei, Anhui, People's Republic of China
  
  Funding: National Natural Science Foundation of China (Contract NO. 11045003)
Hefei Light Source (HLS) is a 2nd generation light source lasering high flux ultraviolet and soft x-ray with 200 MeV to 800 MeV electron beam. To explorer other applications of the electron storage ring of HLS, a concept design of Hefei Compton Scattering Light Source (HCSLS) is proposed. In this paper, Compton Scattring Simulation Code(CSSC), a parallel code based on the analytical method to simulate the Compton scattering between the laser beam and the electron beam, is presented. Using the CSSC, it is computed that HCSLS will produce photons with a total flux of 109 s-1 to 1011 s-1, and energy of 0.07 MeV to 1.15 MeV at the maximum spectral flux density with the 200 MeV to 800 MeV electron beam scattering with a kilo-watts CO2 laser. With a much shorter wave laser beam from an Nd:YVO4 laser, the scattered photons energy at the maximum spectral flux density is improved by a factor of 10, while its flux is reduce by a factor of 100 due to the lower peak laser power. 		 
 
TUP123 Performance of the 352-MHz 4-kW CW Solid State RF Power Amplifier System using 1-kW Push-pull Devices klystron, controls, cavity, simulation 1059
 
  • D. Horan, G.J. Waldschmidt
    ANL, Argonne, USA
  
  Funding: Work supported by U. S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357
Development and testing of a prototype 352-MHz, 4-kW cw solid state rf power amplifier system is underway at the Advanced Photon Source to study and evaluate the performance advantages of an upgrade to solid state rf power technology at the APS. General performance measurement data on the assembled amplifier system is discussed, with emphasis on efficiency improvements possible through the use of dynamic drain voltage control. 		 
 
TUP141 RF Solid State Driver for Argonne Light Source klystron, booster, background, simulation 1097
 
  • B. Popovic
    University of Iowa, Iowa City, Iowa, USA
  • G.J. Waldschmidt
    ANL, Argonne, USA
  
  Funding: 2010 Lee Teng Summer Student Program at Argonne National Laboratory
Currently, power to the APS storage ring and Booster cavities is provided from klystrons with a eventual goal to move to a solid state RF system. A modular design centered around a 1 kW amplifier has been decided on. The driver amplifier was created for this module system using Agilent’s ADS circuit simulation software and then built and tested. 		 
 
TUP145 Introduction to HLSII Storage Ring Conventional Magnets quadrupole, dipole, sextupole, synchrotron 1100
 
  • H. Zhang, G. Feng, W.W. Li, W. Li, J.J. Liang, L. Wang, S.C. Zhang
    USTC/NSRL, Hefei, Anhui, People's Republic of China
  
  HLS (Hefei Light Source) is a dedicated synchrotron radiation research facility, whose emittance is relatively large. In order to improve the performance of HLS, especially getting higher brilliance synchrotron radiation and increasing the number of straight section for insertion devices, an upgrade project named HLSII will be proceeded soon. The storage ring lattice comprises 8 dipoles, 32 quadrupoles and 32 combined function sextupoles. Design and analysis of the magnets are showed in the paper. the multipurpose combined function magnet is the first one designed and used in China. Mechanical design and fabrication procedures for the magnets are presented also.  
 
TUP149 Magnetic Field Mapping and Integral Transfer Function Matching of the Prototype Dipoles for the NSLS-II at BNL dipole, electron, synchrotron, quadrupole 1112
 
  • P. He, M. Anerella, G. Ganetis, R.C. Gupta, A.K. Jain, P.N. Joshi, J. Skaritka, C.J. Spataro, P. Wanderer
    BNL, Upton, Long Island, New York, USA
  
  The National Synchrotron Light Source-II (NSLS-II) storage ring at Brookhaven National Laboratory (BNL) will be equipped with 54 dipole magnets having a gap of 35 mm, and 6 dipoles having a gap of 90 mm. The large aperture magnets are necessary to allow the extraction of long-wavelength light from the dipole magnet to serve a growing number of users of low energy radiation. The dipoles must not only have good field homogeneity (0.015% over a 40 mm x 20 mm region), but the integral transfer functions and integral end harmonics of the two types of magnets must also be matched. The 35 mm aperture dipole has a novel design where the yoke ends are extended up to the outside dimension of the coil using magnetic steel nose pieces. A Hall probe mapping system has been built with three Group 3 Hall probes mounted on a 2-D translation stage. The probes are arranged with one probe in the midplane of the magnet and the others vertically offset by ±10 mm. The field is mapped along a nominal 25 m radius beam trajectory. The results of measurements in the as-received magnets, and with modifications made to the nose pieces will be presented.  
 
TUP177 Open Midplane Dipoles for a Muon Collider dipole, collider, radiation, luminosity 1160
 
  • R.J. Weggel, J. Kolonko, R.M. Scanlan
    Particle Beam Lasers, Inc., Northridge, California, USA
  • M. Anerella, R.C. Gupta, H.G. Kirk, R. B. Palmer, J. Schmalzle
    BNL, Upton, Long Island, New York, USA
  • D.B. Cline, X.P. Ding
    UCLA, Los Angeles, California, USA
  
  Funding: This work is supported by the U.S. Department of Energy under Contract No. DE-AC02-98CH10886 and SBIR contract DOE Grant Numbers DE-FG02-07ER84855 and DE-FG02-08ER85037.
For a muon collider with copious decay particles in the plane of the storage ring, open-midplane dipoles (OMD) may be preferable to tungsten-shielded cosine-theta dipoles of large aperture. The OMD should have its midplane completely free of material, so as to dodge the radiation from decaying muons. Analysis funded by a Phase I SBIR suggests that a field of 10-20 T should be feasible, with homogeneity of 1x10-4 and energy deposition low enough for conduction cooling to 4.2 K helium. If funded, a Phase II SBIR would refine the analysis and build and test a proof-of-principle magnet. 		 
 
TUP193 NSLS-II Power Supply Controller power-supply, controls, booster, diagnostics 1187
 
  • W. Louie, L.R. Dalesio, G. Ganetis, Y. Tian
    BNL, Upton, Long Island, New York, USA
  
  This paper presents the design of the National Synchrotron Light Source II (NSLS-II) Power Supply Controller (PSC). It consists of a main board, rear module and backplane. The main features of NSLS-II PSC included 256MB DDR2 memory for power supply system diagnostics, high speed serial link between PSC modules, an embedded microprocessor and a 100 Mbps Ethernet port. Each PSC module can be remotely programmed through network. NSLS-II PSC will be used to control power supplies in Storage Ring, Booster Ring and Transport line. The PSC also provides interface for the NSLS-II fast and slow orbits feedback system.  
 
TUP218 Design of a Liquid Helium Transfer System for the TPS Project cryogenics, SRF, controls, electron 1220
 
  • H.H. Tsai, M.H. Chang, S.-H. Chang, W.-S. Chiou, F. Z. Hsiao, H.C. Li, M.-C. Lin, T.F. Lin, C.P. Liu, Ch. Wang
    NSRRC, Hsinchu, Taiwan
  
  The construction of the Taiwan Photon Source (TPS) storage ring is under way, to be completed in mid 2012. The new helium cryogenic system is provided from the Linde Company, to be installed after the TPS storage ring is completed. The super conducting radio frequency (SRF) cavities is needed to maintain the electron energy of storage ring and were operated at refrigeration mode such that the cold helium gas from the cavity cryostat is returned to the refrigerator. One distribution valve box and individual segments of multichannel transfer lines is required to supply the liquid helium and liquid nitrogen to the SRF cavities and recover the gas helium and gas nitrogen back to the cryogenic system. This paper is aimed to present the configuration and design features of the LHe transfer system. The heat load and pressure drop calculation of the transfer system was also presented.  
 
TUP232 Super-Conducting Wigglers and the Effect on Injection Efficiency injection, wiggler, simulation, betatron 1259
 
  • M.J. Sigrist, L.O. Dallin, W.A. Wurtz
    CLS, Saskatoon, Saskatchewan, Canada
  
  The Canadian Light Source has two superconducting wigglers (SCW) operating at 2.1T and 4.3T peak fields. Injection efficiency into the storage ring is reduced by either device operating at high fields. Currently the CLS operates with a Fill and Decay mode, injecting with both wigglers at reduced field to avoid low injection efficiencies. Future implementation of a Top-up mode will require both wigglers to be operating at full field and better injection efficiencies will be required. Simulations and experiments have shown that the poor injection efficiency is related to operating a high vertical chromaticity. Much improved efficiencies are observed at when the chromaticity is lowered. As well, small improvements to the injection efficiency have been achieved through local correction of the beta-beats and tune shifts caused by the wigglers and optimisation of the injection co-ordinates of the injected beam. Measurements of the injection efficiencies at various chromaticities will be presented along with the betatron oscillations before and after correction.  
 
TUP235 Strategy for Neutralizing the Impact of Insertion Devices on the MAX IV 3 GeV Ring multipole, optics, lattice, vacuum 1262
 
  • E.J. Wallén, S.C. Leemann
    MAX-lab, Lund, Sweden
  
  In order to prepare for the potentially negative influence on the beam lifetime, injection efficiency and beam size from the insertion devices (IDs) on the stored beam of the MAX IV 3 GeV storage ring strategy for neutralizing the foreseen effects of the IDs has been developed. In short the strategy involves a local correction of the betatron phase advance by adjusting the strength of the quadrupoles adjacent to the ID. There will also be a global tune correction in order to avoid drift in the working point of the storage ring during operation. Air coils with empirical feed forward tables for the excitation current in the coils will compensate for field integral errors. The lattice of the MAX IV 3 GeV storage ring appears to be robust and it tolerates the dynamic multipoles created by the expected initial set of IDs provided that the local correction of the betatron phase advance has been carried out.  
 
TUP236 Progress of a Gradient Damping Wiggler of the ALPHA Storage Ring dipole, damping, wiggler, electron 1265
 
  • C.W. Huang, D.J. Huang
    NTHU, Hsinchu, Taiwan
  • S.D. Chen
    NCTU, Hsinchu, Taiwan
  • M.-H. Huang, C.-S. Hwang, C.Y. Kuo, F.-Y. Lin, Y.T. Yu
    NSRRC, Hsinchu, Taiwan
  • S.-Y. Lee
    IUCF, Bloomington, Indiana, USA
  
  The main purpose of a gradient damping wiggler (GDW) to be installed in the Alpha storage ring in Indiana University is to correct the momentum-compaction factor and the damping partition in the Alpha storage ring. One middle pole and two outer poles in one set of the GDW are installed on the same girder. Two sets of GDW will be installed in the two short straight sections. The dipole and gradient-field strengths of the middle (outer) pole are 0.67 T (-0.67 T) and 1.273 T m-1 (1.273 T m-1), respectively. One completed set of GDW is already fabricated; we shall add an end shim to improve the region of effective good field within which the middle and outer poles along the transverse x-axis (△B/B = 0.1 %) are ±50 and ±40 mm respectively. We used a trim coil on the three poles to adjust the first and second integral fields to zero. Here we discuss the integral magnetic field features along the straight trajectory and the ideal orbital trajectory with a Hall probe mapping system, and present an analysis of the magnetic field.  
 
WEOCS5 Experience of the Cryogenic System for Taiwan Light Source cryogenics, cavity, controls, status 1466
 
  • F. Z. Hsiao, C.-S. Hwang
    NSRRC, Hsinchu, Taiwan
  
  In Taiwan light source a superconductive cavity and five superconductive magnets are installed in the storage ring. The cryogenic system provides liquid helium and liquid nitrogen with stable pressure. Failure events occurred on the components such as expansion turbine, compressor, and frequency inverter during the past years. A supervision system was developed to monitor the status of the cryogenic system and an automatic call out system was built to notify the operators when abnormal condition appears. To shorten the interruption period of liquid helium supply, the dewar keeps stable and continuous supply of liquid helium and the recovery compressor collets the evaporated helium gas from the cryostat for cases of several hours shutdown of the cryogenic system. Humidity, cleanliness and helium leak tightness are items necessary to be well controlled before connecting new components or application devices to the cryogenic system. The matching between system cooling capacity and heat load is achieved via adjustment of turbine speed, precooling temperature, compressor speed, and heater power.  
 
WEODN3 Performance Optimization for the LNLS Fast Orbit Feedback System feedback, controls, power-supply, synchrotron 1485
 
  • D.O. Tavares, S.R. Marques
    LNLS, Campinas, Brazil
  
  The Brazilian Synchrotron Light Laboratory (LNLS) has recently commissioned a Fast Orbit Feedback System for its 1.37 GeV third-generation UVX Storage Ring. This paper presents the optimization work which was carried out using the new hardware capabilities. Well known strategies such as singular values conditioning for correction matrix, dynamic control by means of PID or IMC controllers and EVC (Eigenvector constrained) method for minimizing position error in source points were explored. The problem of actuator limitations (saturation and slew rate) was also investigated, providing a new front line for improving orbit stability through feedback.  
slides icon Slides WEODN3 [1.114 MB]  
 
WEODN4 NSLS-II Fast Orbit Feedback with Individual Eigenmode Compensation feedback, controls, emittance, EPICS 1488
 
  • Y. Tian, L.-H. Yu
    BNL, Upton, Long Island, New York, USA
  
  This paper presents the NSLS-II fast orbit feedback system with individual eigenmode compensation. The fast orbit feedback system is a typical multiple-input and multiple-output (MIMO) system. Traditional singular value decomposition (SVD) based fast orbit feedback systems treat each eigenmode the same and the same compensation algorithm is applied to all the eigenmodes. In reality, a MIMO system will have different frequency responses for different eigenmodes and thus it is desirable to design different compensation for each eigenmode. The difficulty with this approach comes from the large amount of computation that needs to be done within the time budget of the orbit feedback system. We designed and implemented the NSLS-II fast orbit feedback (FOFB) system with individual eigenmode compensation by taking advantage of the parallel computation capability of field programmable gate array (FPGA) chips.  
slides icon Slides WEODN4 [1.064 MB]  
 
WEP031 Low-Emittance Lattice Designs for ALS Ultimate Upgrade emittance, dipole, lattice, quadrupole 1549
 
  • C. Sun, H. Nishimura, D. Robin, C. Steier, W. Wan
    LBNL, Berkeley, California, USA
  
  Based upon the Theoretical Minimum Emittance (TME) technique, a new method has been developed to optimize low-emittance and low-beta lattices for further brightness upgrades at the Advanced Light Source (ALS). The study provides us a different perspective on the lattice design, and confirms results earlier found using both Global Scan of All Stable Settings (GLASS) and Genetic Algorithms (GA) techniques. Since the optimal low-beta lattice may have a dynamic aperture too small to allow off-axis injection, to overcome this problem, an alternating high-low beta lattice could be used for the upgrade. Several options of these high-low beta lattices are investigated using Genetic Algorithms.  
 
WEP063 Tracking Particles Through A General Magnetic Field sextupole, lattice, photon, HOM 1591
 
  • A. Xiao, M. Borland, L. Emery, Y. Wang
    ANL, Argonne, USA
  
  Funding: Work supported by the U. S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357.
A method that tracks particles directly through a general magnetic field described in a 3D field table was added to the code elegant recently. It was realized by converting an arbitrary particle's motion to a combination of free-drift motion and centripetal motion through the coordinate system rotation and using a general linear interpolation tool developed at the Advanced Photon Source (APS). This method has been tested by tracking particles through conventional magnetic elements (dipole, sextupole, etc.) to verify reference coordinate system conversions, tracking accuracy, and long-term tracking stability. Results show a very good agreement between this new method and the traditional method. This method is not designed to replace mature traditional methods that have been used in most tracking codes. Rather, it is useful for magnets with complicated field profiles or for studying edge effects. 		 
 
WEP090 Simulation Study of Intrabeam Scattering in Low Emittance Ring scattering, emittance, simulation, lattice 1639
 
  • W. Fan, G. Feng, D.H. He, W. Li, L. Wang, S.C. Zhang, T. Zhou
    USTC/NSRL, Hefei, Anhui, People's Republic of China
  
  HALS(Hefei Advanced Light Source) is under designing dedicated to good coherence and high brightness at 1.5GeV. Low emittance is required to reach the design request. Due to the low energy and emittance with relative high bunch charge, intrabeam scattering effect will be very strong. It is worth accurately calculating to check if the design goal can be reached. Theoretic calculation based on Gaussian beam distribution doesn't warrant in strong IBS regime. In this paper we present the results of particle simulation study of intrabeam scattering effect on a temporary design lattice of HALS ring.  
 
WEP102 Current Dependent Tune Shifts in the University of Maryland Electron Ring UMER space-charge, vacuum, electron, focusing 1668
 
  • D.F. Sutter, B.L. Beaudoin, S. Bernal, M. Cornacchia, R.A. Kishek, T.W. Koeth, P.G. O'Shea
    UMD, College Park, Maryland, USA
  
  Funding: Work supported by the U.S. DOE Offices of High Energy Physics and Fusion Energy Sciences and by the U.S. DOD Office of Naval Research and Joint Technology Office.
The shift in betatron tunes as a function of space charge has been studied in many accelerators and storage rings. Because of its low operating energy (10 keV, γ = 1.02) and wide range of beam currents (0.6 to 100 mA, corresponding respectively to predicted incoherent tune shifts of 1.2 to 5.2), the University of Maryland electron ring (UMER) provides a unique opportunity to study space charge driven tune shifts over a wide parameter space. Comparisons of predictions and measurements are presented, including a discussion of special factors such as the magnetic penetration of the vacuum chamber walls. 		 
 
WEP150 GPU Computing for Particle Tracking optics, dynamic-aperture, simulation, lattice 1764
 
  • H. Nishimura, S. James, K. Muriki, Y. Qin, K. Song, C. Sun
    LBNL, Berkeley, California, USA
  
  Funding: Work supported by the U.S. Department of Energy under Contract No. DE-AC02-05CH11231
This is a feasibility study of using a modern Graphics Processing Unit (GPU) to parallelize the accelerator particle tracking code. To demonstrate the massive parallelization features provided by GPU computing, a simplified TracyGPU program is developed for dynamic aperture calculation. Performances, issues, and challenges from introducing GPU are also discussed. 		 
 
WEP151 HPC Cloud Applied to Lattice Optimization lattice, synchrotron, synchrotron-radiation, quadrupole 1767
 
  • C. Sun, S. James, K. Muriki, H. Nishimura, Y. Qin, K. Song
    LBNL, Berkeley, California, USA
  
  Funding: Work supported by the U.S. Department of Energy under Contract No. DE-AC02-05CH11231
As Cloud services gain in popularity for enterprise use, vendors are now turning their focus towards providing cloud services suitable for scientific computing. Recently, Amazon Elastic Compute Cloud (EC2) introduced the new Cluster Compute Instances (CCI), a new instance type specifically designed for High Performance Computing (HPC) applications. At Berkeley Lab, the physicists at the Advanced Light Source (ALS) have been running Lattice Optimization on a local cluster, but the queue wait time and the flexibility to request compute resources when needed are not ideal for rapid development work. To explore alternatives, for the first time we investigate running the Lattice Optimization application on Amazon’s new CCI to demonstrate the feasibility and trade-offs of using public cloud services for science.

 
 
WEP192 Simulation Results for a Cavity BPM Design for the APS Storage Ring cavity, simulation, damping, linac 1849
 
  • X. Sun, G. Decker
    ANL, Argonne, USA
  
  Funding: Work supported by U.S. Department of Energy, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357.
A rectangular cavity BPM / tilt monitor for the APS storage ring has been designed to detect residual vertical-longitudinal tilt caused by the proposed short-pulse x-ray (SPX) project crab cavities. Electromagnetic simulations have been performed to verify the conceptual design and evaluate design alternatives. MAFIA and Microwave Studio have been applied to simulate the device in both time and frequency domains. The device geometry has been optimized to efficiently damp strongly driven lower- and higher-order modes while preserving the tilt-sensitive mode of interest. This mode is coupled out to the processing electronics using a waveguide geometry chosen to maximize isolation from the beam-driven modes. 		 
 
THOBS1 Developments in Superconducting Insertion Devices undulator, wiggler, photon, electron 2077
 
  • E.R. Moog, Y. Ivanyushenkov
    ANL, Argonne, USA
  
  Funding: Work supported by U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357.
A number of superconducting wigglers are installed and in operation worldwide. Superconducting undulators, with their shorter periods and more demanding field quality requirements, present additional challenges and are still under development. Superconducting technology can produce a higher magnetic field strength on the beam axis than can a permanent-magnet-based undulator. This makes shorter period undulators feasible – they will still reach high enough field to have a reasonable photon energy tuning range. The shorter period device gives higher photon brightness at higher photon energies, opening up new opportunities for photon-hungry applications that require higher photon energies. Many light sources are interested in having a superconducting undulator; a few, including the Advanced Photon Source, have ongoing projects and are making significant progress. The status of these projects will be discussed. 		 
slides icon Slides THOBS1 [3.427 MB]  
 
THOBS2 Optimization of Magnet Stability and Alignment for NSLS-II alignment, damping, emittance, ion 2082
 
  • S.K. Sharma, L. Doom, A.K. Jain, P.N. Joshi, F. Lincoln, V. Ravindranath
    BNL, Upton, Long Island, New York, USA
  
  Funding: This work was supported by Department of Energy contract DE-AC02-98CH10886
The high-brightness design of NSLS-II requires uncorrelated vertical RMS motion of the multipole magnets on a girder to be less than 25 nm. Also, the highly nonlinear lattice requires alignment of the multipole magnets to 30 microns. The speaker will describe the stability of the girder-magnets assembly and the factors affecting it, such as ambient ground motion and temperature fluctuations in the storage ring. Technical solutions to achieve the desired stability will be presented as well. 		 
slides icon Slides THOBS2 [4.431 MB]  
 
THP120 Light Sources Optimized with Super Bends dipole, emittance, photon, brightness 2342
 
  • L. Emery
    ANL, Argonne, USA
  • C. Steier
    LBNL, Berkeley, California, USA
  
  Funding: Work at Argonne was supported by U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under contract No. DE-AC02-06CH11357
In the past small storage rings with dipole-magnet-only sources were called second-generation light sources (before insertion devices (IDs) were used). With today's technology, e.g. superconducting dipole magnet of 5 T (e.g., ALS's Superbend *), one could make a smaller ring (say, 60-m circumference) with substantial brightness for dipole-magnet beams. Without IDs, these optimized sources would be designated as between second and third generation. Such rings don't exist yet, but their concept can be compared with other types of compact light sources. Typical parameters of such ring would be 60-m circumference, 2 GeV, several 5-T dipole sources in TME-like cells, and 4x1013 photons/s/0.1% BW at 1 Angstrom. The number of beamlines is variable, but potentially very large, only limited by funding.
* D. Robin et al., NIM A 538, 1-3, (2005), 65-92. 		 
 
THP132 Beam Diagnostics using BPM Signals from Injected and Stored Beams in a Storage Ring injection, closed-orbit, simulation, betatron 2369
 
  • G.M. Wang, W.X. Cheng, R.P. Fliller, R. Heese, T.V. Shaftan, O. Singh, F.J. Willeke
    BNL, Upton, Long Island, New York, USA
  
  Funding: Work supported by U.S. DOE, Contract No.DE-AC02-98CH10886
Many modern light sources are operating in top-off injection mode or are being upgraded to top-off injection mode. For top-off injection mode, the storage ring always has the stored beam and injected beam. So the BPM data is the mixture of both beam positions and the injected beam position cannot be measured directly. We propose to use a BPM with special electronics in NSLS II storage ring to retrieve the injected beam trajectory with the SVD method. The BPM has the capability to measure bunch-by-bunch beam position. We also need another system to measure the bunch-by-bunch beam current. The injected beam trajectory can be measured and monitored all the time without dumping the stored beam. We can adjust and optimize the injected beam trajectory to maximize the injection efficiency. We can also measure the storage ring acceptance by mapping the injected beam trajectory. 		 
 
THP133 Modulation of Low Energy Beam to Generate Predefined Bunch Trains for the NSLS-II Top-off Injection linac, gun, emittance, kicker 2372
 
  • G.M. Wang, W.X. Cheng, R.P. Fliller, R. Heese, J. Rose, T.V. Shaftan
    BNL, Upton, Long Island, New York, USA
  
  Funding: Work supported by U.S. DOE, Contract No.DE-AC02-98CH10886
The NSLS II linac will produce a bunch train, 80-150 bunches long with 2 ns bunch spacing. Having the ability to tailor the bunch train can lead to the smaller bunch to bunch charge variation in the storage ring. A stripline is integrated into the linac baseline to achieve this tailoring. The stripline must have a fast field rise and fall time to tailor each bunch. The beam dynamics is minimally affected by including the extra space for the stripline. This paper discusses the linac beam dynamics with stripline, and the optimal design of the stripline. 		 
 
THP135 Implementation of a DC Bump at the Storage Ring Injection Straight Section septum, injection, kicker, vacuum 2378
 
  • G.M. Wang, R.P. Fliller, W. Guo, R. Heese, S.L. Kramer, B. Parker, T.V. Shaftan, C.J. Spataro, F.J. Willeke, L.-H. Yu
    BNL, Upton, Long Island, New York, USA
  
  Funding: Work supported by U.S. DOE, Contract No.DE-AC02-98CH10886
The NSLS II beam injection works with two septa and four fast kicker magnets. The kicker power supplies each produce a two revolution periods pulsed field, 5.2μs half sine waveform, using ~5kV drive voltage. The corresponding close orbit bump amplitude is ~15mm. It is desired that the bump they produce is transparent to the users for top-off injection. However, high voltage and short pulse power supplies have challenges to maintain pulse-to-pulse stability and magnet-to-magnet reproducibility. To minimize these issues, we propose to implement a DC local bump on top of the fast bump to reduce the fast kicker strength by a factor of 2/3. This bump uses two ring corrector magnets plus one additional magnet at the septum to create a bump. Additionally, these magnets could provide a DC bump, which would simulate the effects of a movable septum on the store beam lifetime. This paper presents the detail design of this DC injection bump and related beam dynamics. 		 
 
THP191 Recent Progress in Injector Improvement of SPEAR 3 booster, quadrupole, injection, linac 2477
 
  • K. Tian, W.J. Corbett, D. Dell'Orco, D. Ernst, S.M. Gierman, J.A. Safranek, J.F. Schmerge, B. Scott
    SLAC, Menlo Park, California, USA
  
  The frequent injection and high current operation of SPEAR 3 storage ring requires high stability of the injector system at the Stanford Synchrotron Radiation Laboratory (SSRL). The lattice of linac-to-booster (LTB) transport line was not well understood and controlled prior to this work. In this paper, we discuss the significant efforts that have been made to improve the performance of the LTB. A method to correct the distortion of the closed orbit in the booster by moving 2 quadrupoles is also presented.  
 
THP211 Design Features and Construction Progress of 500-Mhz Rf Systems for the Taiwan Photon Source SRF, cryogenics, booster, LLRF 2513
 
  • Ch. Wang, L.-H. Chang, M.H. Chang, C.-T. Chen, L.J. Chen, F.-T. Chung, F. Z. Hsiao, M.-C. Lin, Y.-H. Lin, C.H. Lo, G.-H. Luo, M.H. Tsai, T.-T. Yang, M.-S. Yeh, T.-C. Yu
    NSRRC, Hsinchu, Taiwan
  • M.C. Lee
    SSRF, Shanghai, People's Republic of China
  
  The accelerator complex of the Taiwan Photon Source (TPS) consists of two 500-MHz RF systems: one RF system with KEKB-type single-cell SRF modules is used for the 3-GeV storage ring of circumference 518 m, and the other with five-cell Petra cavities at room temperature is for the concentric full-energy booster synchrotron. This overview of the construction of the 500-MHz RF systems for the TPS is presented with emphasis on our strategy to approach the expectation of highly reliable SRF operation of the TPS. How to complete the construction project on time, on budget and on performance is our unique concern.  
 
THP214 Pulsed Multipole Injection for the MAX IV Storage Rings injection, multipole, septum, sextupole 2522
 
  • S.C. Leemann
    MAX-lab, Lund, Sweden
  
  The MAX IV facility presently under construction will include two storage rings for the production of synchrotron radiation. The 3 GeV ring will house insertion devices for the production for x-rays while the 1.5 GeV ring will serve UV and IR users. Both rings will be operated at a constant 500 mA of stored current with top-up shots supplied by the 3.5 GeV MAX IV linac acting as a full-energy injector. So far, injection into both storage rings has been designed using a conventional approach: a closed four-kicker injection bump brings the stored beam to the septum blade where the injected bunches are captured in a single turn. Recently, studies have been carried out to investigate the feasibility of using a pulsed multipole for injection into the storage rings. Pulsed multipole injection does not require an injection bump and has the potential to make top-up injection transparent to users. This paper reports on these studies and summarizes requirements for the pulsed sextupole magnet to be installed for injection into the MAX IV storage rings.  
 
THP216 Progress with NSLS-II Injection Straight Section Design injection, septum, kicker, vacuum 2528
 
  • T.V. Shaftan, A. Blednykh, W.R. Casey, L.R. Dalesio, R. Faussete, M.J. Ferreira, R.P. Fliller, G. Ganetis, R. Heese, H.-C. Hseuh, P.K. Job, E.D. Johnson, B.N. Kosciuk, S. Kowalski, S.L. Kramer, D. Padrazo, B. Parker, I. Pinayev, S.K. Sharma, O. Singh, C.J. Spataro, G.M. Wang, F.J. Willeke
    BNL, Upton, Long Island, New York, USA
  
  Funding: This work is supported by U.S. DOE, Contract No.DE-AC02-98CH10886
NSLS-II injection straight section consists of the pulsed and DC/Slow bumps, septa system, beam trajectory correction and diagnostics systems. In this paper we discuss overall injection straight layout, preliminary element designs, specifications for the pulsed and DC magnets and their power supplies, vacuum devices and chambers and diagnostics devices. 		 
 
FROBS4 NSLS-II RF Systems cavity, linac, klystron, coupling 2583
 
  • J. Rose, W.K. Gash, B. Holub, Y. Kawashima, H. Ma, N.A. Towne, M. Yeddulla
    BNL, Upton, Long Island, New York, USA
  
  The NSLS-II RF systems include solid state modulators for the S-band klystrons powering the traveling wave sections for the 200 MeV injector linac, 7 cell cavity with IOT amplifier for the 3 GeV booster synchrotron and superconducting 500 MHz cavities powered by klystrons and a passive 1500 MHz SRF cavity for the 3 GeV, 500 mA storage ring. The systems are controlled by digital I/Q modulators fed by an ultra-low noise master oscillator. System overviews will be given along with preliminary test data.  
slides icon Slides FROBS4 [1.041 MB]