PAC07 - List of Keywords (storage-ring)

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storage-ring

Paper	Title	Other Keywords	Page
MOYKI01	e⁺e^- Factories	factory, luminosity, vacuum, electron	12
	M. K. Sullivan
	Funding: Work supported by USDOE contract DE-AC02-76SF00515 The achievements of the e⁺e^- Factories have been impressive. The KEK B- Factory has achieved a peak luminosity of 1.7x10³⁴ cm²/s and the PEP-II B-Factory has reached 1.2x10³⁴ cm²/s while the Dafne Phi-Factory has obtained 1.5x10³² cm²/s. Early in the B-Factory running, CP violation in the B meson system was found to be consistent with the prediction of the Standard Model. Now all three factories are integrating as much luminosity as they can in order to look for rare decay channels that may have a rate that differs from the value predicted by the Standard Model and therefore hint at New Physics. I will give a status report on the most recent accomplishments of all three factories PEP-II, KEKB and Dafne and will show what the three facilities have for plans to further improve performance.
	Slides

MOYKI02	Commissioning of New Synchrotron Radiation Facilities	synchrotron, radiation, synchrotron-radiation, injection	17
	Z. Zhao
	Several new synchrotron radiation facilities have been commissioned over the past two years, and almost every commissioning is an impressive success with a high performance level and a swift process. In this paper, an overview of the new synchrotron radiation facilities which are coming into operation, such as Diamond, SOLEIL, Australian Synchrotron and Indus-II, is presented.
	Slides

MOOAAB01	Philosophy for NSLS II Design with Sub-nanometer Horizontal Emittance	emittance, lattice, dipole, wiggler	77
	S. Ozaki J. Bengtsson, S. L. Kramer, S. Krinsky, V. Litvinenko BNL, Upton, Long Island, New York
	In this paper we present design philosophy for reliable light sources with sub-nm horizontal emittance used for conceptual design of NSLS II. We discuss the fundamentals of the concept, such as using reliable achromatic low-emittance lattice with large bending radius and damping wigglers with modest peak field. We also discuss a natural scale of the emittance set by intra-beam scattering and its influence of the choice of the bending radius for the ring. In addition, we review a very weak dependence of the beam lifetime on the emittance, and present a clear physics explanation of the phenomena. Finally, we list main parameters of the 3 GeV NSLS II X-ray ring.
	Slides

MOOAAB04	Quadruple-bend Achromatic Low Emittance Lattice Studies	emittance, lattice, dipole, electron	86
	M.-H. Wang H.-P. Chang, H. C. Chao, P. J. Chou, C.-C. Kuo NSRRC, Hsinchu S.-Y. Lee, F. Wang IUCF, Bloomington, Indiana
	A quadruple-bend-achromatic (QBA) cell, defined as a super cell made of two double-bend (DB) cells with different outer and inner dipole bend angles, is found to provide a factor of two in lowering the beam emittance of electron synchrotron light sources. The ratio of bending angles of the inner dipoles to that of the outer dipoles is numerically found to be about 1.5₁.6 for an optimal low beam emittance in the isomagnetic condition. The QBA lattice provides an advantage over the double-bend achromat or the double-bend non-achromat in performance by providing some zero dispersion straight-sections and a small natural beam emittance. A lattice with 12 QBA cells with a preliminary dynamic aperture study serves as an example. The effects of the different types of insertion devices (ID) on the emittance in dispersive long straight and non-dispersive long straight are also simulated and reported.
	Slides

MOZAC01	Techology Transfer - When, Why, Issues and Advantages	controls, site, superconducting-magnet, insertion	110
	D. F. Sutter B. P. Strauss HENP, SW Washington
	Technology transfer is an unavoidable task for accelerator/storage ring construction projects. For sub systems that consist of many complex, identical pieces, in house fabrication is not an option as it was in the past, and so industrial procurement is required. If industry has not developed the requisite technology in support of an active market product, technology transfer must be accomplished. An underlying assumption is that the project or national laboratory R&D has fully developed the necessary technology and that industrial expertise in mass production is required. The talk will review the circumstances when technology transfer is appropriate, and based on a review of large system procurements for Fermilab, SLAC, the SSC, SNS, the LHC and RHIC, it will outline general guidelines that have emerged for what is required of project managers and industrial vendors to increase the probability of successful technology transfer and procurement. The guidelines are generally not dependent on specific national acquisition regulations, and therefore are relevant for international projects.
	Slides

MOZAC03	The LANSCE Accelerator: A Powerful Tool for Science and Applications	proton, isotope-production, linac, scattering	120
	K. Schoenberg
	The Los Alamos Neutron Science Center (LANSCE) accelerator was built over 30 years ago. It consists of a 800-MeV proton linac, a proton storage ring, and facilities for isotope production, proton radiography, ultra-cold neutrons, weapons neutron research and for various sciences such as materials, biological and nanotechnology using neutron scattering. For national security, it plays a vital role in stockpile stewardship by providing important data on dynamic events during weapons detonation using proton radiography. The aging components of LANSCE will be refurbished and modernized in the next few years and the LANSCE will continue serving as a prominent facility for both science and national security in the years ahead. After SNS comes on line, it will play a complementary role and will also serve as a staging facility for some experiments to be carried out at SNS. Interesting science being conducted at LANSCE and the plans for the refurbishment and future enhancement of the facility will be presented.
	Slides

MOPAN002	Active Shunts for the LNLS Storage Ring Quadrupoles	power-supply, quadrupole, controls, electron	143
	C. Rodrigues A. R. Silva LNLS, Campinas
	The quadrupoles of the LNLS storage ring are divided into families with two or six units, each one being supplied by an only current source. Some experiments performed by the accelerator physics team require different currents for quadrupoles of a same family. Moreover, there is an interest in obtaining lower steps in the control of their currents. These were the main reasons that required the development of an active shunt. A prototype was built with range of -3A to +3A, what is approximately 3% of the maximum quadrupole current (200A). It was tested with a two-quadrupole family power supply. The full bridge topology was chosen, where the pulse width for the positive and negative output voltages are not the same, which gives an average output current different from zero. Some waveforms and results are shown, such as the long-term stability and output current ripple. Some measurements made in the storage ring electron beam using the active shunt are also described.

MOPAN003	A New Family of Power Supplies for the LNLS Orbit Correctors	power-supply, controls, synchrotron, booster	146
	C. Rodrigues L. H. Oliveira, A. R. Silva LNLS, Campinas
	Recently the substitution of the older family of orbit corrector power supplies of the LNLS electron storage ring was proposed and a new family has been developed. The new model incorporates additional features such as natural ventilation, unit power factor and shorter response time to reference changes. Moreover, higher efficiency and lower weight and size were obtained. At the moment eight units are operating with storage ring orbit correctors, with current and output voltage up to 10A/10V. This family has three stages of power processing. The first one is a power factor corrector using the boost topology, which gives to the second stage a DC voltage about 400V with regulation and ripple better than 1%. The second stage is an isolated half-bridge with two symmetric adjustable DC outputs from 0 to 40V. The last stage consists of a bipolar series linear regulator using Bipolar Transistors (BJT). Some results obtained for this power supply were: output current ripple and one day stability better than 150ppm, reference voltage step response better than 500A/s with the existing orbit corrector magnet, efficiency higher than 62% and power factor better than 98.5%.

MOPAN004	Commissioning of the LNLS Elliptically Polarizing Undulator	undulator, controls, multipole, betatron	149
	P. F. Tavares N. P. Abreu, J. F. Citadini, R. H.A. Farias, M. J. Ferreira, J. G.R. S. Franco, L. C. Jahnel, L. Liu, A. F.A. G. Moreira, X. R. Resende, G. Tosin LNLS, Campinas
	We present the results of the commissioning of the first Elliptically Polarizing Undulator to be installed at the 1.37 GeV electron storage ring of the Brazilian Synchrotron Light Source. The undulator is designed to provide UV and soft X-ray photons from 100 eV up to 1 keV with full polarization control. It uses the APPLE II design with 50 mm period and 22 mm gap and allows for both parallel and anti-parallel longitudinal motion of its magnet cassettes. We present the commissioning results including the measured orbit and tune perturbations as well as the non-linear effects of the undulator fields on the stored beam and the corresponding impact on the beam lifetime.

MOPAN005	Injector Improvements at the Brazilian Synchrotron Light Source	injection, synchrotron, linac, booster	152
	P. F. Tavares F. Arroyo, R. H.A. Farias, L. C. Jahnel, C. Pardine, C. Rodrigues LNLS, Campinas
	We present the results of hardware, software and operational improvements implemented at the injector complex of the 1.37 GeV electron storage ring of the Brazilian Synchrotron Light Source (LNLS) with the aim of improving injector stability and reliability, thus reducing the injection time. The improvements include changes to the 120 MeV injector LINAC RF system and high power modulators, injection automation and the implementation of a new procedure for reusing the current at the end of each user's shifts before injection by ramping the energy back down to 500 MeV (the injection energy) without dumping the beam. All of these changes allowed us to significantly reduce the overall time from the end of a shift to the delivery of beam in the following shift with a positive impact on the reduction of injection thermal transients for the storage ring and beamlines. Further improvements are expected in the near future as a result of planned changes to the injection timing system and of the installation of a recently assembled upgrade of the 500 MeV booster synchrotron RF system

MOPAN011	Upgrade Plans of the Vacuum System of the ESRF	quadrupole, dipole, vacuum, radiation	164
	R. Kersevan L. Goirand ESRF, Grenoble
	The ESRF has been delivering beams to users for well over 12 years. The performance of the storage ring has surpassed the original specifications with respect to many accelerator parameters, such as emittance, beam stability, beam availability and so on. Along the years, many of its sub-systems have been improved in order to cope with these more demanding conditions. Now new experimental techniques and arrangements, such as nanofocusing on the samples, call for a radical upgrade of the machine. Another reason to upgrade is the recent coming into operation of new, more modern machines, and the desire for the ESRF to stay at the forefront of synchrotron radiation research. A study group has been set up, with the aim of producing a conceptual design report for what is called a "Long Term Strategy" for the upgrade of the ESRF. This paper will detail the plans for the LTS upgrade of the storage ring vacuum system.

MOPAN016	P3PO: An Information System for Supporting Installation Procedures at PETRA III	synchrotron, synchrotron-radiation, radiation	179
	J. Kreutzkamp L. Hagge DESY, Hamburg
	For the PETRA III project, an information system called P3PO has been developed for supporting the logistics of the installation process and for managing the technical infrastructure. P3PO provides a central information access point for the PETRA III installation status. The system registers all the components of the accelerator and provides work lists which list the tasks and their responsible groups for each component. It records the progress of work and provides support for managing the documentation. Users can access P3PO through an easy-to-use web-interface and obtain for example inventory lists, delivery status reports and task lists for groups or individuals. P3PO is based on DESYs inventory management and engineering data management systems and is in production since summer 2006. The paper describes the system capabilities and reports benefits and experience.

MOPAN021	Magnetic Field Calculations of the Superconducting Dipole Magnets for the High- Energy Storage Ring at FAIR	dipole, superconducting-magnet, heavy-ion, quadrupole	194
	H. Soltner M. Pabst, R. Tolle FZJ, Julich
	For the High-Energy Storage Ring (HESR) to be established for the FAIR facility, magnetic field calculations have been carried out for the layout of the superconducting dipole magnets. Four configurations have been considered for the 2.72 m long magnets, straight ones and bent ones with a bending radius of 13,889 m, respectively, both for the cos(Θ) layout and for the double helix dipole layout. This contribution will focus particularly on the advantages and disadvantages of the individual configurations in terms of field quality in the diopole regions.

MOPAN022	Investigation of Machine Operation and Related Radiation Dose at the ANKA Storage Ring	undulator, radiation, wiggler, injection	197
	I. Birkel E. Huttel, A.-S. Muller, P. Wesolowski FZK, Karlsruhe
	A new online network for radiation dose measurements offers the opportunity to register the dose rate at the ANKA storage ring every minute. The network consists of six mobile and two stationary monitors with a gamma and a neutron detector and a central computer. The analysis of the dose rate shows strong correlations between beam energy, current, machine parameters and dose rate.

MOPAN047	Mechanical Design Considerations for Sesame Main Subsystems	dipole, vacuum, quadrupole, sextupole	263
	M. M. Shehab G. Vignola SESAME, Amman
	Recent advances in the design and analysis of SESAME vacuum system engineering as well as magnets and girder system mechanical designs are described. Multi objective optimization techniques for the storage ring vacuum chambers design from mechanical design point view and the vibration and stability issues for the magnets will be presented.

MOPAN048	Design of Injection Pulsed Magnets for SESAME Ring	kicker, injection, septum, booster	266
	S. Varnasseri M. M. Shehab, G. Vignola SESAME, Amman
	In this paper the SESAME storage ring injection pulsed magnet system is described. The injection process in the SESAME storage ring requires septum and kicker magnets. In this paper we discuss the geometrical and magnetic field requirements for septum and kicker magnets and present the results obtained from magnetic field analysis and also the optimization of titanium coating for the injection kicker chambers. The final specification for thin septum and injection kickers are also presented.

MOPAN053	Development of Transverse Feedback System and Instabilities Suppress at HLS	feedback, kicker, single-bunch, impedance	269
	J. H. Wang J. Cao, L. Ma, J. Yue IHEP Beijing, Beijing Y. B. Chen, L. J. Huang, W. Li, L. Liu, B. Sun, L. Wang, Y. L. Yang, K. Zheng, Z. R. Zhou USTC/NSRL, Hefei, Anhui D. K. Liu, K. R. Ye SINAP, Shanghai
	In order to cure and damp coupled bunch (CB) instabilities, a transverse bunch-by-bunch feedback system is under commission at Hefei Light Source (HLS). In this paper, we introduce the HLS Bunch-by-Bunch measurement system and transverse feedback system. The experiment result in HLS ring is also presented in this paper.

MOPAN054	Beam Instabilities Measurement and Cures at HLS	feedback, injection, electron, synchrotron	272
	Y. L. Yang Y. B. Chen, L. J. Huang, W. Li, L. Liu, B. Sun, J. H. Wang, K. Zheng, Z. R. Zhou USTC/NSRL, Hefei, Anhui
	In Hefei Light Source (HLS), coupled-bunch instabilities are major limiting factors in achieving higher beam intensity while maintaining good beam quality. To Measure and suppress beam instabilities, turn-by-turn (TBT) measurement and bunch-by-bunch(BxB) measurement & feedback system are under commission [1][2]. The design of the two systems and primary experiment results is presented. Measurement and detail analysing results in injection status will also be shown.

MOPAN065	The Conceptual Design and Thermal Analysis of ALBA Crotch Absorbers	radiation, vacuum, dipole, synchrotron	299
	E. Al-Dmour D. Einfeld, M. Q. Quispe ALBA, Bellaterra (Cerdanyola del Valles)
	ALBA is a 3 GeV, 268.8 m storage ring with DBA structure under construction near Barcelona. With the design current of 400 mA, a total power of 407 kW is radiated by the circulating beam from the bending magnets. The design of the vacuum system was done by using the concept of the crotch absorbers which is used in many modern synchrotron light sources. These absorbers are not only going to absorb the power of the unused radiation but also will allow fast vacuum conditioning. 156 absorbers are need all around the machine in order to guarantee that no radiation will hit the chamber walls, the absorbers are grouped into three types, several design criteria have been studied in order to create our own one which is based on the number of allowed cycles before failure with the concept of the strain values. Finite element analysis has been performed to estimate the stress, strain, maximum overall temperature and the maximum cooling temperature for all the types. The results for the critical absorber under conservative conditions: max. overall temperature is 313 C, max. strain is 0.1% and max. stress is 112 MPa. With this strain, the absorber can withstand up to 1.10⁵ cycles of operation.

MOPAN089	Numerical Simulation Applied to the Air Temperature Control and Improvement at the TLS	booster, simulation, controls, synchrotron	368
	J.-C. Chang M. Ke NTUT, Taipei Z.-D. Tsai NSRRC, Hsinchu
	This paper presents the numerical simulation studies applied on the air temperature control and improvement at the Taiwan Light Source (TLS). To improve air temperature control and study the flow circulation in air conditioned areas, we had applied the computational fluid dynamic (CFD) scheme to the experimental hall, the storage ring tunnel, a technical zone and the booster area, respectively. We review those studies by examining the governing equations, the model construction, mesh generation, boundary conditions, convergence criterion and validation of simulations.

MOPAN093	Stability Improvement of the Cryogenic System at NSRRC	cryogenics, superconducting-magnet, resonance, electron	380
	F. Z. Hsiao S.-H. Chang, W.-S. Chiou, H. C. Li, H. H. Tsai NSRRC, Hsinchu
	Negative gauge pressure appears in the helium suction line during the period of compressor starting up. The negative pressure induces the risk of air leakage into the cryogenic system and the damage to the burst disk of cryostat. A buffer tank is connected to the suction line to avoid the negative gauge pressure. Variation of nitrogen pressure changes the thermal-shielding temperature of the cavity cryostat and thus changes the length and frequency of the cavity. A phase separator with pressure control is installed before the cryostat to isolate the fluctuation of nitrogen pressure at the source side and prevent the trip of electron beam due to the frequency change or the overpressure at the cavity side. The stability improvement after usage of the phase separator shows that variation of the nitrogen pressure to the cavity cryostat is reduced from +0.6/-0.4 bar to ±0.08 bar and the drift of nitrogen pressure is eliminated. The stability after usage of the buffer tank shows that the negative gauge pressure is avoided in the suction line and the peak pressure was reduced from 1.4 bar to 1.2 bar.

MOPAN100	Multiple Quadrupole Magnetic Center Alignment on the Girder	quadrupole, alignment, sextupole, laser	395
	L. Tsai T.-C. Fan, C.-S. Hwang, C. J. Lin, S. Y. Perng, D.-J. Wang NSRRC, Hsinchu
	Conventional alignments of quadrupole magnets on the girder based on the theodolite and fiducial was limited by human-eye resolution and fiducial precision. The accumulative error of group of magnetic centers may be more than 100 μm. In this paper, an automatic quadrupole magnetic center aligning method was proposed using pulsed wire method to align group of quadrupole magnets concentrically on one girder to higher precision. In order to increase the alignment precision, a short wire reduced sag problem in long wire, laser and position sensitive detector (PSD) system was to trace the wire position to level of micron. The precision of the alignment of quadrupole magnetic centers could be within 30μm. Descriptions of the setup and test results are presented.

MOPAN111	Modbus/TCP Controller for the Power Supplies in ALS BTS Beam Line	power-supply, controls, synchrotron, booster	425
	S. Cohen M. W. Sherman, W. D. Sherman Alpha Scientific Electronics, Hayward, CA
	The development, testing and commissioning of a self-contained power supply controller for four 100 KW power supplies for the upgraded Booster to Storage Ring (BTS) beam line at the Advanced Light Source at the Lawrence Berkeley Laboratory, is presented. The power supply controller, is a 3U high, rack-mount chassis, that contains the regulation control-loop amplifiers, 16-bit DAC with microcontroller and aμPLC( Programmable Logic Controller) for power-supply state-machine control. Local control is achieved via push-buttons and a color LCD touch screen. Remote control is mediated viaμPLC using embedded Modbus/TCP. Using a unique, data logging system, the operational parameters of the regulation loop can be safely monitored and recorded while the system is running at full power. The entire design is based on optimum reliability, safety and ease of troubleshooting and repair. A modular design for key control components, allows the power supply to operate in a nominal mode, even if one or two ancillary internal modules fail. This allows for continued beam operation until it is convenient to service the unit, keeping beam availability as high as possible.

MOPAN113	The P0 Feedback Control System Blurs the Line between IOC and FPGA	feedback, controls, photon, monitoring	431
	N. P. Di Monte
	Funding: Work supported by U. S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357. The P0 Feedback System is a new design at the APS with the main intent to stabilize a single bunch in order to operate at a higher accumulated charge. The algorithm for this project required a high-speed DSP solution for a single channel that would make adjustments on a turn-by-turn basis. An FPGA solution was selected that not only met the requirements of the project, but far exceeded the requirements. By using a single FPGA, we were able to adjust up to 324 bunches on two separate channels with a total computational time of ~6x10⁹ multiply-accumulate operations per second. The IOC is a Coldfire CPU tightly coupled to the FPGA, providing a dedicated control and monitoring of the system through EPICS process variables. One of the benefits of this configuration is having a four-channel scope in the FPGA that can be monitored on a continuous basis.

MOPAN116	An FPGA-Based Bunch-to-Bunch Feedback System at the Advanced Photon Source	feedback, damping, kicker, simulation	440
	C. Yao N. P. Di Monte, W. E. Norum ANL, Argonne, Illinois
	Funding: Work supported by U. S. Department of Energy, Office of Basic Energy Sciences, under Contract No. W-31-10⁹-ENG-38. The Advanced Photon Source storage ring has several bunch fill patterns for user operation. The hybrids fill pattern consists of a single bunch with a charge of 16 mA and a bunch train of 56 bunches. Both horizontal and vertical instabilities are observed. Currently chromaticity correction is the only method available to overcome the instability. Beamlife time and injection efficiency suffer because of high sextupole currents. A bunch-to-bunch feedback system is designed to overcome beam instability and reduce the required chromaticity correction. The feedback system is based on an FPGA DSP processor. The signal filtering algorithm is based on the time-domain-least-square method developed at SPring-8. We have just completed the integration of the system. We report the system design and some test results.

MOPAS036	A Physics Based Approach for Ramping Magnet Control in a Compact Booster	booster, controls, injection, power-supply	515
	S. M. Hartman S. F. Mikhailov, V. Popov, Y. K. Wu FEL/Duke University, Durham, North Carolina
	Funding: Supported by US DoE grant #DE-FG02-01ER41175. At Duke University, a booster synchrotron was recently commissioned as part of the HIGS upgrade. For the ramping magnet power supply controls, a scheme was developed to present the high level operator interface in terms of the physics quantities of the accelerator, i.e. the effective focusing strength of the magnets. This scheme allows for the nonlinearities of the magnets – a result of the extremely compact footprint of this booster – to be incorporated into the low level software. This facilitates machine studies and simplifies use of physics modeling. In addition, it simplifies operation, allowing the booster to ramp to any energy from the 0.27 GeV of the injector linac to the 1.2 GeV maximum of the Duke Storage Ring. The high level of flexibility of this system if further advanced by incorporating the level of tunability typically found in a storage ring control system. Tuning changes made during steady-state operation are automatically propagated to the waveforms which make up the booster ramp. This approach provides a good match to the wide operation modes of the Duke Storage Ring and its associated free electron laser, and may useful for other compact booster synchrotrons.

MOPAS037	New Generation Digital Longitudinal Feedback System for Duke FEL and HIGS Facilities	feedback, kicker, synchrotron, electron	518
	Y. Kim M. D. Busch, P. Wang, W. Wu, Y. K. Wu FEL/Duke University, Durham, North Carolina J. Choi, I. S. Ko, I. S. Park PAL, Pohang, Kyungbuk D. Teytelman Dimtel, Redwood City, California
	To increase intensity of the High Intensity Gamma-ray Source (HIGS) which is driven by the Duke storage ring FEL via Compton scattering, stored beam current should be increased. However, high-current multi-bunch operation in the Duke storage ring is limited by strong longitudinal coupled-bunch beam instabilities. To control those instabilities, we have been developing an active longitudinal feedback system which is based on the Integrated Gigasample Processor (iGP) through collaboration with Dimtel, Inc. and Pohang Accelerator Laboratory. In this paper, we report the present status of our longitudinal feedback system.

MOPAS046	LANSCE Radiation Resistant Water Manifold Retrofit for DC Magnets	radiation, injection, proton, scattering	536
	M. J. Borden J. F. O'Hara, E. M. Perez, B. J. Roller, V. P. Vigil, L. S. Walker LANL, Los Alamos, New Mexico
	Funding: Work supported by the United States Department of Energy, National Nuclear Security Agency, under contract DE-AC52-06NA25396 Large maintenance dose burdens have necessitated the development of radiation resistant water manifolds for use on DC magnets in the Proton Storage Ring, at the Los Alamos Neutron Science Center (LANSCE) accelerator. This paper will describe dose measurements and the mechanical design of radiation resistant water manifolds used in PSR.

MOPAS049	Ceramic-Supported Traveling-Wave Structures for SNS Fast Beam Chopper	simulation, linac, coupling, extraction	545
	S. S. Kurennoy
	The current structure for the fast 2.5-MeV beam chopper for the Spallation Neutron Source (SNS) project was originally developed* to provide rise and fall times around 1 ns. The structure is based on the meander-folded notched strip line with low-dielectric-constant supports and metal separators. Since then the requirements of the chopper rise-time has been significantly relaxed, up to 10 ns, as a result of beam dynamics simulations and to simplify the voltage pulse generators. In addition, initial runs with the beam showed that this structure was prone to damage when accidental beam spills occurred. We suggest alternative meander structures for the SNS chopper that employ high-dielectric-constant substrate (e.g., alumina). Time-domain simulations show their electromagnetic performance to be well within the requirements, while their resistance to beam spills and thermal properties are expected to be much better and fabrication significantly simpler. * S. S. Kurennoy and J. F. Power, EPAC 2000 (Vienna, Austria, 2000), 336.

MOPAS053	LANSCE Vacuum System Improvements for Higher Reliability and Availability	vacuum, ion, linac, proton	557
	T. Tajima M. J. Borden, A. Canabal, J. P. Chamberlin, S. Harrison, F. R. Olivas, M. A. Oothoudt, J. J. Sullivan LANL, Los Alamos, New Mexico
	The Los Alamos Neutron Science Center (LANSCE) accelerator, an 800-MeV proton linac with a storage ring, has been operated over 30 years since early 1970s. Due to the aging and radiation damage of equipment, cables and connectors, the number of troubles is increasing. In order to reduce the time for unscheduled maintenance, we have implemented a system to catch a symptom of degrading vacuum and send an email automatically. We have been testing this system since July 2006. This paper describes this alert system and our experience. In addition, we will describe our plan for modernizing the vacuum system in the next few years.

MOPAS075	RF-Thermal-Structural Analysis of a Waveguide Higher Order Mode Absorber	simulation, vacuum, higher-order-mode, radio-frequency	605
	G. Cheng E. Daly, R. A. Rimmer, M. Stirbet, L. Vogel, H. Wang, K. Wilson Jefferson Lab, Newport News, Virginia
	Funding: This manuscript has been authored by Jefferson Science Associates, LLC under U. S. DOE Contract No. DE-AC05-06OR23177, and by The Office of Naval Research under contract to the Dept. of Energy. For an ongoing high current cryomodule project, a total of 5 higher order mode (HOM) absorbers are required per cavity. The load is designed to absorb RF heat induced by HOMs in a 748.5MHz cavity. Each load is targeted at a 4 kW dissipation capability. Embedded cooling channels are employed to remove the heat generated in ceramic tiles and by surface losses on the waveguide walls. A sequentially coupled RF-thermal-structural analysis was developed in ANSYS to optimize the HOM load design. Frequency dependent dielectric material properties measured from samples and RF power spectrum calculated by the beam-cavity interaction codes were considered. The coupled field analysis capability of ANSYS avoided mapping of results between separate RF and thermal/structural simulation codes. For verification purposes, RF results obtained from ANSYS were compared to those from MAFIA, HFSS, and Microwave Studio. Good agreement was reached and this confirms that multiple-field coupled analysis is a desirable choice in analysis of HOM loads. Similar analysis could be performed on other particle accelerator components where distributed RF heating and surface current induced losses are inevitable.

MOPAS101	Characterization of the RF System of NSLS X-ray Ring	electron, synchrotron, pick-up, controls	661
	I. Pinayev
	The proper phasing is required for a storage ring with multiple RF cavities. In this paper we present method for simultaneous measurement of the accelerating voltage and relative phase for individual cavity at operational conditions. Theory and experimental results for NSLS X-ray synchrotron are presented.

MOPAS102	Design of Beam Transfer Lines for the NSLS II	booster, injection, extraction, quadrupole	664
	N. Tsoupas R. Heese, R. Meir, I. Pinayev, J. Rose, T. V. Shaftan, C. Stelmach BNL, Upton, Long Island, New York
	Funding: Work supported by the US Department of Energy The proposed NSLS II light source* to be built at Brookhaven National Laboratory utilizes a LINAC and a Booster with a Storage-ring which share the same tunnel, but at different horizontal planes. The Booster which accepts beam from the LINAC, accelerates the electron beam to an energy of 3.0 GeV and the beam is extracted to the Booster_to_Storage_Ring(BtS) transport line. The BtS line transports the beam and injects it into the Storage ring . In order to facilitate the design of the BtS transfer line, the line has been partitioned in three sections which can be considered as independent. The function of each the three sections will be discussed in details and the procedure for the design of the BtS line and other details about the optics and the magnetic elements of the line will be presented in the paper. The LINAC to Booster beam transfer line will also be discussed. *NSLS II CDR BNL

TUPMN001	The Australian Synchrotron Project	synchrotron, vacuum, injection, undulator	911
	A. Jackson
	Funding for the Australian Synchrotron, a 3 GeV synchrotron light source, was announced by the Victorian State Government in January 2003, and six months later bulldosers moved onto the green-field site in the South-East suberbs of Melbourne. After a remarkably fast construction and installation period the accelerators that form the heart of the faclity were commissioned in 2006. Installation of the first five beamlines will commence in January 2007 and it is expected that the first experiments will be carried out in April. In this presentation we give an update on the status of the facility and present highlights of the commissioning activities.

TUPMN008	Commissioning of the First Insertion Devices at SOLEIL	undulator, coupling, synchrotron, vacuum	929
	C. Benabderrahmane P. Berteaud, F. Briquez, P. Brunelle, O. V. Chubar, M.-E. Couprie, J.-M. Filhol, M. Girault, O. Marcouille, F. Marteau, M. Massal, F. Paulin, M. Valleau, J. Veteran SOLEIL, Gif-sur-Yvette
	The 2.75 GeV storage ring of the SOLEIL third generation light source in France consists of 16 cells and 24 straight sections (4x12m,12x7m, 8x3.6m) for a total circumference of 357 m. 24 insertion devices are planned for providing high brillance radiation from UV to hard X ray. They consist of adjustable polarisation sources in the UV-soft X ray (electromagnetic devices of periods 640 mm and 256 mm, APPLE-II of periods ranging between 80 and 34 mm, and one EMPHU) and planar devices for the production of hard X ray (in vacuum undulators of period 20 or 26 mm and one in vacuum wiggler). During the commissioning of the presently installed seven insertion devices (HU640, 2xHU256, 2 HU80, 2xU20), the effects on the beam have been studied (closed orbit distortions, tune shifts,..), compared with the expectations from magnetic measurements in laboratory, and compensated using feed forward local correctors. The radiation observed on the first photon diagnostic at the beamlines is also analysed.

TUPMN010	Latest Developments of Insertion Devices at ACCEL Instruments	undulator, insertion-device, insertion, electron	935
	D. Doelling A. Hobl, H.-U. Klein, P. A. Komorowski, D. Krischel, M. Meyer-Reumers ACCEL, Bergisch Gladbach
	ACCEL Instruments GmbH has designed, manufactured, assembled, and tested several insertion devices for many synchrotron light sources and free electron lasers around the world. Besides the superconducting (sc) wavelength shifters, sc-wigglers and sc-Undulators, ACCEL has entered the pure permanent magnet based insertion device market. The latest progress of the ID group was the production of 6 identical PPM Undulators for the SPARC FEL project in Frascati (Italy), the production of a prototype Undulator and an industrial study on large scale Undulator production for the European X-FEL project in Hamburg (Germany). ACCEL has signed a know how and license agreement with the ID group of the ESRF in order to be able to supply customers with high quality insertion devices in short delivery times. Therefore ACCEL has setup an standard ESRF 7 m granite measuring bench. Design efforts, measurement techniques, and performance results will be presented.

TUPMN014	Commissioning of the 100 MeV Racetrack Microtron of the Metrology Light Source	microtron, gun, electron, emittance	944
	K. B. Buerkmann-Gehrlein T. Birke, J. Borninkhof, P. Budz, R. Daum, V. Duerr, J. Feikes, W. Gericke, H. G. Glass, H. G. Hoberg, J. Kolbe, R. Lange, G. Mielczarek, I. Mueller, K. Ott, J. Rahn, G. Schindhelm, T. Schneegans, Th. Schroeter, D. Schueler, D. Simmering, T. Westphal BESSY GmbH, Berlin R. Klein, G. Ulm PTB, Berlin
	Funding: Physikalisch-Technische Bundesanstalt, Abbestr. 2 - 12, 10587 Berlin, Germany In 2003, the Metrology Light Source (MLS) was approved, a dedicated low energy electron storage ring of the Physikalisch-Technische-Bundesanstalt (PTB), the German national metrology institute. Design, construction and operation of the MLS are realized by BESSY, based on the PTB requirements for a permanent accessible radiometry source, optimized for the spectral range between UV up to VUV. The MLS is tunable in energy between 200 MeV and 600 MeV. Based on the experiences at BESSY, a highly stable and reliable Race Track Microtron for injection was realized by Danfysik. The commissioning of the 100 MeV microtron at the MLS started in December 2006. The concept and construction as well as the main parameters of the microtron are introduced.

TUPMN015	First Commissioning Results of the Metrology Light Source	electron, injection, kicker, radiation	947
	J. Feikes M. Abo-Bakr, T. Birke, J. Borninkhof, P. Budz, K. B. Buerkmann-Gehrlein, R. Daum, O. Dressler, V. Duerr, F. Falkenstern, H. G. Glass, H. G. Hoberg, J. Kolbe, J. Kuszynski, R. Lange, I. Mueller, R. Muller, J. Rahn, G. Schindhelm, T. Schneegans, Th. Schroeter, D. Schueler, E. Weihreter, G. Wuestefeld BESSY GmbH, Berlin G. Brandt, R. Fliegauf, A. Hoehl, R. Klein, R. Muller, R. Thornagel, G. Ulm PTB, Berlin
	Funding: Physikalisch-Technische Bundesanstalt, Abbestr. 2 - 12, 10587 Berlin, Germany The Physikalisch-Technische Bundesanstalt (PTB), the German national metrology institute, has built an electron storage ring in close cooperation with BESSY for energies between 200 MeV and 600 MeV. This storage ring, named Metrology Light Source (MLS), will mainly be used for radiometry and can be operated as a primary source standard. The spectral range of the MLS is optimized for UV, EUV and also for Terahertz radiation. Commissioning is planed for May 2007. First MLS commissioning results will be reported.

TUPMN047	W-band Electromagnetic Wave Undulator for AIST 800 MeV Electron Storage Ring TERAS	undulator, electron, photon, synchrotron	1025
	H. Toyokawa R. Kuroda AIST, Tsukuba, Ibaraki H. Ohgaki Kyoto IAE, Kyoto
	An electromagnetic-wave undulator based on a quasi-optical resonator operated in higher order TE mode is proposed to generate monochromatic X-rays. We plan to install it to an 800MeV electron storage ring TERAS of AIST. Mode propagation in the resonator was analysed with an electromagnetic-wave simulation code MAFIA and HFSS. Design parameters for the undulator operated in W-band (95 GHz) was presented. The peak electric field along the electron orbit was estimated to be 130 kV/m when we fed 1 kW of 95 GHz electromagnetic wave. The estimated X-ray flux density was 1 x 10¹¹ photons/sec/mrad²/A for 3.4 keV X-rays.

TUPMN048	Recent Developments at UVSOR-II	laser, electron, undulator, radiation	1028
	M. Katoh K. Hayashi, M. Hosaka, A. Mochihashi, M. Shimada, J. Yamazaki UVSOR, Okazaki Y. Takashima Nagoya University, Nagoya
	UVSOR, a 750 MeV synchrotron light source of 53m circumference had been operated for more than 20 years. After a major upgrade in 2003, this machine was renamed to be UVSOR-II. The ring is now routinely operated with low emittance of 27 nm-rad and with four undulators, two in-vacuum ones and two variably polarized ones. The injector and the beam transport line are being upgraded to be compatible with full energy injection, preparing for the top up operation in near future. A resonator type free electron laser is successfully operational in very wide range, from visible to deep UV, with high average power exceeding 1 W. A femto-second laser bunch slicing system was constructed by utilizing a part of the FEL system. Intense coherent terahertz radiation was successfully produced by the slicing. Coherent harmonic generation was successfully demonstrated by using the same laser system.

TUPMN050	Development of Pulsed-Laser Super-Cavity for Compact X-Ray Source Based on Laser-Compton Scattering	laser, electron, feedback, photon	1034
	K. Sakaue S. Araki, M. K. Fukuda, Y. Higashi, Y. Honda, T. Taniguchi, N. Terunuma, J. Urakawa KEK, Ibaraki N. Sasao, H. Yokoyama Kyoto University, Kyoto M. Takano Tsukuba-shi, Ibaraki-ken M. Washio RISE, Tokyo
	A compact and high quality x-ray source is required from various field, such as medical diagnosis, drug manifacturing and biological sciences. Laser-Compton based x-ray source that consist of a compact electron storage ring and a pulsed-laser super-cavity is one of the solutions of compact x-ray source. Pulsed-laser super-cavity has been developed for a compact high brightness x-ray sources at KEK-ATF. The pulsed-laser super-cavity increases the laser power and stably makes small laser beam size at the collision point with the electron beam. Recently, 357MHz mode-locked Nd:VAN laser pulses can be stacked stably in a 420mm long Fabry-Perot cavity with 1'000 enhancement in our R&D. Therefore, we have planned a compact hard x-ray sources using 50MeV multi-bunch electrons and a pulse stacking technology with 42cm Fabry-Perot cavity. (LUCX Project at KEK) The photon flux is multiplied with the number of bunches by using multi-bunch beam and super-cavity. Development of the super-cavity and present result of LUCX will be presented at the conference.

TUPMN052	Completion of the Australian Synchrotron Storage Ring RF System Commissioning	klystron, controls, synchrotron, vacuum	1040
	S. Takama R. T. Dowd, A. Jackson, G. LeBlanc, K. Zingre ASP, Clayton, Victoria Y. Hirata, H. Kamikubo, Y. Nobusada, H. Suzuki Toshiba, Yokohama
	The installation and commissioning of the Australian Synchrotron Storage Ring RF System (SR RF System) was completed. SR RF System consists of four sets of 500MHz 150kW-CW klystron and 750kV normal conducting cavity. After the cavity aging, the RF System achieved 48 hours continuous operation in November 2006. The paper will present the design and commissioning results.

TUPMN059	The Nonlinear Effects of Fringe Fields in HLS	dipole, quadrupole, damping, sextupole	1061
	L. Wang G. Feng, W. Li, L. Liu, H. Xu USTC/NSRL, Hefei, Anhui S. C. Zhang USTC, Hefei, Anhui
	As a small low energy electron storage ring, the fringe field effects on linear and nonlinear properties maybe can not be ignored. In this paper, the fringe field of dipole magnets and quadrupole magnets on linear optics parameters and nonlinear driving terms of general purpose operation mode in HLS storage ring were analyzed and calculated. The results showed that, for GPLS mode, the fringe field of dipole and quadrupole is the main source of tune shift with amplitude. The fringe field of dipole contributes non-ignorable part to vertical chromaticity. Similar behavour is also displayed in non linear driving terms.

TUPMN060	A Low Emittance Lattice Design for HLS Storage Ring	emittance, lattice, radiation, dynamic-aperture	1064
	L. Wang G. Feng, W. Li, L. Liu, H. Xu USTC/NSRL, Hefei, Anhui S. C. Zhang USTC, Hefei, Anhui
	Lower beam emittance is the most effective measure to higher brilliance of light source. To enhance performance of HLS ring, a new low emittance lattice was studied and introduced in this paper. The scale of new lattice is designed according to the current ground settlement of HLS ring, but the focusing structure and mangets were changed. The new designed lattice has two operation mode, low emittance mode and low momentum compaction mode. In this paper, the linear lattice function and dynamic aperutre of the new designed lattice was briefly introduced. Caculation results showed that, after upgrade, the brilliance of HLS storage ring can approach the level of third order light source.

TUPMN061	An Upgrade Proposal of Injection Bump System for HLS	injection, kicker, simulation, emittance	1067
	L. Wang G. Feng, W. Li, L. Liu, H. Xu USTC/NSRL, Hefei, Anhui S. C. Zhang USTC, Hefei, Anhui
	The current injection bump system of Hefei Light Source was designed eight years ago, and operated five years ago. In this paper, the advantages and shortcomings of current bump system were analyzed, and reasonalbe design objective was summed up. According to new design goal, a new physical design of bump system for HLS ring was completed. The acceptance of injected beam and perturbation on stored beam were analyzed. At same time, the ELEGANT software was used to simulate the injection process under new designed bump system. The results showed that, with new designed bump system, the injection rate would be higher than 90%, and the perturbation on orbit of stored beam would be small enough.

TUPMN066	Status of the ALBA Project	vacuum, injection, septum, booster	1073
	D. Einfeld
	The construction of ALBA, the 3 GeV third generation Synchrotron Light Source near Barcelona (Spain) is proceeding according to schedule. The works for the building started in June 2006 and access to the building for installation of the 100 MeV Linac is expected at the end of 2007. Most of the machine components are already under construction and some have already been delivered. This report will concentrate on recent design developments, component choices and current status. Also the results on the first prototypes will be discussed. Other papers at this conference deal with accelerator physics issues and low level RF.

TUPMN070	Magnet Block Arrangements for the Apple-II Elliptically Polarized Undulator	polarization, undulator, multipole, photon	1079
	C.-S. Hwang C.-H. Chang, M.-H. Huang, P. H. Lin NSRRC, Hsinchu
	The good field region (magnetic field roll-off) of the horizontal and vertical field distribution in the elliptically polarized undulator (EPU) of the APPLE II structure is too short. Meanwhile, the strong force variation will be created between the magnet arrays on different phase. Hence, a magnet block was magnetized with an tilt angle has been studied to enlarge the good field region and a different arrangement of magnet block module is used to reduce the force variation. In addition, the pure and hybrid structure of the EPU with different end pole design has been studied. This study will obtain a small variation of the first and second field integral on different gap and phase. This work will report the scheme of the magnet block arrangement and the end pole design for the APPLE II elliptically polarized undulator.

TUPMN074	Improvements to the Injection Efficiency at the Taiwan Light Source	injection, booster, septum, quadrupole	1091
	Y.-C. Liu H.-P. Chang, J. Chen, P. J. Chou, K. T. Hsu, K. H. Hu, C. H. Kuo, C.-C. Kuo, K.-K. Lin, G.-H. Luo, M.-H. Wang NSRRC, Hsinchu
	Taiwan light source started the 200 mA top-up operation in October 2005, and the stored beam current was subsequently ramped up to 300 mA top-up operation. In the early phase of top-up operation, the injection efficiency had large variation at different machine condition. We have developed the procedures to maintain the injection efficiency. These optimization procedures will be activated whenever the injection efficiency degrades during the top-up operation of TLS.

TUPMN085	The Commissioning of the Diamond Storage Ring	optics, injection, feedback, single-bunch	1109
	R. Bartolini
	The Diamond Light Source opened for user operation at the end January 2007. The storage ring was successfully commissioned at 3 GeV in three months by the end of December 2006. An intensive Accelerator Physics program allowed the design emittance of 2.7 nm with 150 mA stored beam to be reached as well as the commissioning of the first seven insertion devices. We describe here the results of the measurements performed to characterise accelerator optics, to bring the insertion device in operation and a first analysis of orbit stability and collective instabilities, as well as the status and plans for fast orbit feedback, multi-bunch feedback and top-up operation.

TUPMN086	Operation of the Diamond Light Source Injector	booster, linac, injection, single-bunch	1112
	C. Christou V. C. Kempson Diamond, Oxfordshire
	The Diamond Light source injector consists of a 100 MeV pre-injector linac and a 3 GeV full energy booster. The injection system has been reliably providing beam to the storage ring since September 2006 in both multibunch and single bunch mode, at 5 Hz repetition rate. All user operation at present is carried out in multibunch mode, with an injection efficiency up to 95%. Single bunch and hybrid modes are being developed now for users later this year. Differences in operation between multibunch and single bunch mode are largely restricted to the linac, although a small correction in booster sextupole ramp is needed for single bunch operation. Single bunch purity has been measured in the storage ring to be greater than 99.9%. The timing system can be controlled to allow a wide range of filling patterns, including complete ring fill in both single and multibunch mode, and hybrid fills with individual single bunches placed in gaps between continuous bunch trains. Top-up operation is envisaged for user operation in the future, and trials are underway to ensure safe and efficient running in this mode.

TUPMN087	Electron Beam Dynamics Studies During Commissioning of the Diamond Storage Ring	lattice, coupling, quadrupole, optics	1115
	I. P.S. Martin R. Bartolini, R. T. Fielder, E. C. Longhi, B. Singh Diamond, Oxfordshire
	The Diamond Light Source is the new medium energy 3rd generation light source located at the Harwell Science and Innovation Campus in the UK. The storage ring was successfully commissioned at full energy during the period Sept. to Dec. 2006, and is now delivering synchrotron light to users. During the commissioning period, operation of the storage ring at the design specifications was established in terms of closed orbit distortion, linear optics, coupling correction and emittance. In this report we provide details of these studies as well as more recent investigations of non-linear beam dynamics.

TUPMN089	Configuration, Optics, and Performance of a 7-GeV Energy Recovery Linac Upgrade for the Advanced Photon Source	emittance, linac, undulator, photon	1121
	M. Borland G. Decker, A. Nassiri, M. White ANL, Argonne, Illinois
	Funding: Work supported by the U. S. Department of Energy, Office of Science, Basic Energy Sciences, under Contract No. DE-AC02-06CH11357. The Advanced Photon Source (APS) is a 7-GeV storage ring light source that has been in operation for over a decade. In order to make revolutionary improvements in the performance of the existing APS ring, we are exploring the addition of a 7-GeV energy recovery linac (ERL) to the APS complex. In this paper, we show the possible configuration of such a system, taking into account details of the APS site and the requirement that stored beam capability be preserved. We exhibit a possible configuration for the single-pass, 7-GeV linac. We discuss optical solutions for transport from 10 MeV to 7 GeV and back, including a large turn-around arc that would support 48 additional user beamlines. Tracking results are shown that include incoherent and coherent synchrotron radiation, resulting in predictions of the beamline performance.

TUPMN090	Evaluation of the Possibility of Using Damping Wigglers in the Advanced Photon Source	wiggler, emittance, damping, lattice	1124
	M. Borland L. Emery ANL, Argonne, Illinois
	Funding: Work supported by the U. S. Department of Energy, Office of Science, Basic Energy Sciences, under Contract No. DE-AC02-06CH11357. The Advanced Photon Source (APS) is a 7-GeV storage ring light source that has been in operation for over a decade. Over time, the performance of the APS has been increased by reduction of the emittance from 8 nm to 3.1 nm and by the use of top-up mode. We continue to explore options for improving the performance further. This paper discusses the possible improvements in emittance that could result from the use of damping wigglers. We also discuss rf and space requirements.

TUPMN091	Planned Use of Pulsed Crab Cavities for Short X-ray Pulse Generation at the Advanced Photon Source	impedance, photon, single-bunch, damping	1127
	M. Borland J. Carwardine, Y.-C. Chae, P. K. Den Hartog, L. Emery, K. C. Harkay, A. H. Lumpkin, A. Nassiri, V. Sajaev, N. Sereno, G. J. Waldschmidt, B. X. Yang ANL, Argonne, Illinois V. A. Dolgashev SLAC, Menlo Park, California
	Funding: Work supported by the U. S. Department of Energy, Office of Science, Basic Energy Sciences, under Contract No. DE-AC02-06CH11357. In recent years, we have explored application to the Advanced Photon Source (APS) of Zholents'* crab-cavity-based scheme for production of short x-ray pulses. Work concentrated on using superconducting (SC) cavities in order to have a continuous stream of crabbed bunches and flexibility of operating modes. The challenges of the SC approach are related to the size, cost, and development time of the cavities and associated systems. A good case can be made for a pulsed system** using room-temperature cavities. APS has elected to pursue such a system in the near term, with the SC-based system planned for a later date. This paper describes the motivation for the pulsed system and gives an overview of the planned implementation and issues. Among these are overall configuration options and constraints, cavity design options, frequency choice, cavity design challenges, tolerances, instability issues, and diagnostics plans. A. Zholents et al., NIM A 425, 385 (1999).*P. Anfinrud, private communication.

TUPMN093	A Kilohertz Picosecond X-Ray Pulse Generation Scheme	synchrotron, kicker, photon, damping	1133
	W. Guo M. Borland, K. C. Harkay, C.-X. Wang, B. X. Yang ANL, Argonne, Illinois
	The duration of the x-ray pulse generated at a synchrotron light source is typically tens of picoseconds. Shorter pulses are highly desired by the users. In electron storage rings, the vertical beam size is usually orders of magnitude less than the bunch length due to radiation damping; therefore, a shorter pulse can be obtained by slitting the vertically tilted bunch. Zholents proposed tilting the bunch using rf deflection. We found that tilted bunches can also be generated by a dipole magnet kick. A vertical tilt is developed after the kick in the presence of non-zero chromaticity. The tilt was successfully observed and a 4.2-ps pulse was obtained fom a 27-ps electron bunch at the Advanced Photon Source. Based on this principle we propose a short-pulse generation scheme that produces picosecond x-ray pulses at a repetition rate of 1~2 kHz, which can be used for pump-probe experiments. The tilt phenomenon can also be utilized for machine parameter measurement.

TUPMN099	An Energy Recovery Linac Upgrade for the Advanced Photon Source Located in the Storage Ring Infield	linac, injection, emittance, dipole	1145
	N. Sereno M. Borland, H. W. Friedsam ANL, Argonne, Illinois
	Funding: Work supported by the U. S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357. In the recent past, the Advanced Photon Source (APS) was asked by the U. S. Department of Energy to explore a revolutionary upgrade based on emerging energy recovery linac (ERL) technology. In an ERL, the energy of the 7-GeV, 100-mA beam is recovered after the beam passes through user beamlines by decelerating the beam back through the same superconducting linac cavities that accelerated it. The main constraint on this upgrade is that the existing APS beamlines not be disturbed. This requires that the APS storage ring be used as a single-pass transport line in the overall ERL beamline layout. A natural place to locate the ERL is inside the existing APS storage ring ‘‘infield'' area, which has unoccupied space south of the existing APS injector complex. Other important constraints include minimal disturbance of existing building structures and injector beamlines. The existing injector complex would be preserved so that existing operation can be continued through and even possibly beyond ERL commissioning. In this paper, we describe a layout that satisfies these constraints. We also estimate the amount of emittance increase the beam will experience before ring injection.

TUPMN107	A Proposed Multipole Wiggler for CAMD	wiggler, injection, lattice, radiation	1161
	V. P. Suller M. G. Fedurin BNL, Upton, Long Island, New York P. Jines, D. J. Launey, T. A. Miller, Y. Wang LSU/CAMD, Baton Rouge, Louisiana
	It is proposed to replace the 7 Tesla wavelength shifter, which has been operating in CAMD since 1998, with a superconducting Multi Pole Wiggler (MPW). This will have 11 main poles with peak fields of 7.5 Tesla and will be accommodated in a cryo-cooled cryostat whose overall length will be 2.5 m. It will be necessary to modify the storage ring lattice parameters in order to inject into the reduced 20 mm vertical aperture of this MPW. The results are presented of tests which have been made of several different lattice configurations which have low vertical beta at the proposed location of the MPW.

TUPMN115	Creating a Pseudo Single Bunch at the ALS	kicker, closed-orbit, single-bunch, resonance	1182
	G. J. Portmann K. M. Baptiste, W. Barry, J. Julian, S. Kwiatkowski, L. Low, D. W. Plate, D. Robin LBNL, Berkeley, California
	Funding: This work was supported by U. S. Department of Energy under Contract No. DE-AC03-76SF00098. Typically storage ring light sources operate with the maximum number of bunches as possible with a gap for ion clearing. By evenly distributing the beam current the overall beam lifetime is maximized. The Advanced Light Source (ALS) has 2 nanoseconds between the bunches and typically operates with 276 bunches out of a possible 328. For experimenters doing timing experiment this bunch separation is too small and would prefer to see only one or two bunches in the ring. In order to provide more flexible operations and substantially increase the amount of operating time for time-of-flight experimenters, it is being proposed to kick one bunch on a different vertical closed orbit. By spatially separating the light from this bunch from the main bunch train in the beamline, one could potentially have single bunch operation all year round. By putting this bunch in the middle of the ion clearing gap the required bandwidth of the kicker magnets is reduced. Using one kicker magnet running at the ring repetition rate (1.5 MHz), this bunch could be permanently put on a different closed orbit. Using multiple kicker magnets, this bunch could be locally offset at an arbitrary frequency.

TUPMN117	Exploring the Limits of the ALS Triple Bend Lattice	lattice, emittance, quadrupole	1188
	D. Robin W. Wan LBNL, Berkeley, California
	Funding: Work supported by the U. S. Department of Energy under Contract No. DE-AC03-76SF00098 The triple bend achromat cell of the ALS has been shown to be very flexible and compact. It has been operated in a low emittance mode and a low momentum compaction mode. In fact the lattice can be operated in a large range of different stable modes. Until recently most of these recently discovered modes had not been explored or even known about. Many of these modes have potentially attractive features as compared with the present operational mode. In this paper we take a step back and look at the general stability limits of the lattice. We employ a technique we call GLASS that allows us to rapidly scan and find all possible stable modes and then characterize their associated properties. In this paper we illustrate how the GLASS technique gives a global and comprehensive vision of the capabilities of the lattice.

TUPMS003	Status of the Top-off Upgrade of the ALS	injection, radiation, brightness, booster	1197
	C. Steier B. J. Bailey, K. M. Baptiste, W. Barry, A. Biocca, W. E. Byrne, M. J. Chin, R. J. Donahue, R. M. Duarte, M. P. Fahmie, J. Gath, S. R. Jacobson, J. Julian, J.-Y. Jung, S. Kwiatkowski, S. Marks, R. S. Mueller, H. Nishimura, J. W. ONeill, S. Prestemon, D. Robin, S. L. Rossi, F. Sannibale, T. Scarvie, D. Schlueter, D. Shuman, G. D. Stover, CA. Timossi, T. Warwick, J. M. Weber, E. C. Williams LBNL, Berkeley, California
	Funding: This work was supported by the Director, Office of Science, Office of Basic Energy Sciences, U. S. Department of Energy under Contract No. DE-AC02-05CH11231. The Advanced Light Source is currently being upgraded for top-off operation. This major facility upgrade will provide an improvement in brightness from soft x-ray undulators of about one order of magnitude and keep the ALS competitive with the newest intermediate energy light sources. Major components of the upgrade include making the booster synchrotron capable of full energy operation, radiation safety studies, improvements to interlocks and collimation systems, diagnostics upgrades as well as emittance improvements in the main storage ring. The project status will be discussed as well as results of major parts of the commissioning.

TUPMS017	Accelerator Physics Research and Light Source Development Programs at Duke University	booster, electron, synchrotron, wiggler	1215
	Y. K. Wu
	Funding: This work is supported by the US AFOSR MFEL grant #FA9550-04-01-0086 and by U. S. DoE grant DE-FG05-91ER40665. The Duke Free-Electron Laser Laboratory (DFELL) has recently completed two major accelerator/light source development projects - we successfully commissioned the world's first distributed optical klystron FEL (DOK-1 FEL) and a new 0.27-1.2 GeV booster synchrotron. The DOK-1 FEL has a much improved FEL gain compared with traditional optical klystrons. This allows the DOK-1 FEL to become a versatile light source for UV-VUV operation and as a driver for a high-intensity Compton gamma-source. The top-off booster injector for the Duke storage ring is part of the upgrade project of High Intensity Gamma-ray Source (HIGS), a facility jointly developed by the DFELL and Triangle Universities Nuclear Laboratory (TUNL). The accelerator and light source development has created new opportunities for the accelerator physics research. In this paper, we will report our recent progress in accelerator and light source development as well as the ongoing accelerator physics research programs to meet the new challenges in the areas of beam dynamics and beam instability.

TUPMS074	Collective Effects in the NSLS-II Storage Ring	emittance, impedance, damping, single-bunch	1344
	S. Krinsky J. Bengtsson, J. S. Berg, M. Blaskiewicz, A. Blednykh, W. Guo, N. Malitsky, C. Montag, B. Podobedov, J. Rose, N. A. Towne, L.-H. Yu BNL, Upton, Long Island, New York F. Wang MIT, Middleton, Massachusetts
	Funding: This work was supported by Department of Energy contract DE-AC02-98CH10886. A new high-brightness synchrotron light source (NSLS-II) is under design at BNL. The 3-GeV NSLS-II storage ring has a double-bend achromatic lattice with damping wigglers installed in zero-dispersion straights to reduce the emittance below 1nm. In this note, we present an overview of the impact of collective effects upon the performance of the storage ring. Subjects discussed include Touschek lifetime, intra-beam scattering, instability thresholds due to ring impedance, and use of a third-harmonic Landau cavity.

TUPMS077	Injection Simulations for NSLS-II Storage Ring	injection, simulation, emittance, lattice	1350
	I. Pinayev J. Rose, T. V. Shaftan, L.-H. Yu BNL, Upton, Long Island, New York
	Operation of the NSLS-II storage ring in the top-up mode requires highly reliable injection with low losses. In this paper we provide results of the injection simulations for the storage ring. The alignment tolerances as well as requirements for the injected beam parameters are also discussed.

TUPMS083	Conceptual Design of the NSLS-II Injection System	booster, injection, lattice, emittance	1362
	T. V. Shaftan J. Beebe-Wang, J. Bengtsson, G. Ganetis, W. Guo, R. Heese, H.-C. Hseuh, E. D. Johnson, V. Litvinenko, A. U. Luccio, W. Meng, S. Ozaki, I. Pinayev, S. Pjerov, D. Raparia, J. Rose, S. Sharma, J. Skaritka, C. Stelmach, N. Tsoupas, D. Wang, L.-H. Yu BNL, Upton, Long Island, New York
	Funding: This work was supported by Department of Energy contract DE-AC02-98CH10886. We present conceptual design of the NSLS-II injection system. The injection system consists of low-energy linac, booster and transport lines. We review the requirements on the injection system imposed by the storage ring design and means of meeting these requirements. We discuss main parameters and layout of the injection system components.

TUPAN072	Analysis of BEPCII Optics Using Orbit Response Matrix	optics, quadrupole, sextupole, coupling	1544
	Y. Wei
	Funding: Work supported by Core University Program Due to the errors in all kinds of components of storage ring, the real ring optics is different from the design one. A computer code LOCO is developed to calibrate the linear optics based on the closed orbit response matrix. This paper discusses mainly on the procedure and results of optics correction at BEPCII BPR. Using LOCO, we have determined the errors of quadrupole strengths, BPM gains and corrector kicks, and found the quadrupole strengths that best restore the design optics with sextupoles on. Optics measurement after correction shows the real optics agrees well with the design optics. weiyy@mail.ihep.ac.cn

WEPMN017	RF System for the Elettra New Full Energy Booster Injector	booster, linac, synchrotron, extraction	2083
	A. Fabris M. Bocciai, L. Bortolossi, M. Ottobretti, C. Pasotti, M. Rinaldi, M. Svandrlik ELETTRA, Basovizza, Trieste
	The Elettra new full energy injector will be based on a 100 MeV linac and a 2.5 GeV booster synchrotron and it will replace the existing 1.2 linac injector. This paper presents the design, construction and the test results of the RF system for the booster synchrotron. The analysis of the foreseen operating scenario is also described. The system must be as simple and reliable as possible, taking into consideration the high availability required for the possible top-up mode of operation. It has also to be consistent with the other upgrades of the facility, as the upgrade of the storage ring RF system. The booster RF system will use a 500 MHz 5-cell copper cavity powered by a 60 kW klystron based power plant. The low level electronics has been in-house developed, starting from the system in operation in the storage ring, increasing the performances and developing the new features required by the use of a five-cell cavity, instead of a single cell one, and by the ramped operation. The commissioning of the new injector is scheduled to start in summer 2007, while the first Elettra operation for users with the new full energy injector is expected for the first quarter of 2008.

WEPMN062	HOM Analysis and Design of its Removal System for SRF 3rd Harmonic RF Cavity in PLS	electron, impedance, superconducting-RF, vacuum	2179
	Y. U. Sohn J. Choi, M.-H. Chun, J. Y. Huang, I. S. Ko, I. S. Park PAL, Pohang, Kyungbuk
	Funding: Korea Ministry of Science & Technology Pohang Accelerator Laboratory has prepared to SRF 3rd harmonic cavity to increase beam lifetime and to damp orbit instability by lengthening electron bunch in PLS. The SRF cavity was developed and its vertical test was done already with success. Higher order modes were analyzed to optimize its performance in beam orbit. Most of them are not effective to electron beam, while the others have possibility to impact orbit stability. These harmful HOMs can be removed by HOM absorber installed in beam pipe. This paper reports the HOM analysis and design of its removal system.

WEPMN085	The Advanced Photon Source Pulsed Deflecting Cavity RF System	photon, klystron, controls, electron	2224
	A. E. Grelick A. R. Cours, N. P. Di Monte, A. Nassiri, T. Smith, G. J. Waldschmidt ANL, Argonne, Illinois
	Funding: Work supported by the U. S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357. The Phase I Advanced Photon Source Deflecting Cavity System for producing short X-ray pulses uses one multi-cell, S-band cavity to apply a deflecting voltage to the stored electron beam ahead of an undulator that supports a beamline utilizing short picosecond X-rays. Two additional multi-cell cavities are then used to cancel out the perturbation and redirect the electron beam along the path of its nominal orbit. The pulsed rf system driving the deflecting cavities is described. Design tradeoffs are discussed with emphasis on topology considerations and digital control loops making use of sampling technology in a manner consistent with the present state of the art.

WEPMN086	High-Power Tests of a Single-Cell Copper Accelerating Cavity Driven by Two Input Couplers	vacuum, simulation, radiation, shielding	2227
	D. Horan D. J. Bromberek, D. A. Meyer, G. J. Waldschmidt ANL, Argonne, Illinois
	Funding: Work supported by U. S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357. High-power tests were conducted on a 350MHz, single-cell copper accelerating cavity driven simultaneously by two H-loop input couplers for the purpose of determining the reliability, performance, and power-handling capability of the cavity and related components, which have routinely operated at 100kW power levels. The test was carried out utilizing the APS 350MHz RF Test Stand, which was modified to split the input rf power into two 1/2-power feeds, each supplying power to a separate H-loop coupler on the cavity. Electromagnetic simulations of the two-coupler feed system were used to determine coupler match, peak cavity fields, and the effect of phasing errors between the coupler feedlines. The test was conducted up to a maximum total rf input power to the cavity of 200kW CW. Test apparatus details and performance data will be presented.

WEPMN115	Results of the ALS Booster Ring RF System Upgrade for Top-Off Mode of Operation	booster, controls, power-supply, vacuum	2307
	K. M. Baptiste P. W. Casey, S. Kwiatkowski, CA. Timossi LBNL, Berkeley, California
	Funding: Supported by the U. S. Department of Energy under Contract No. DE-AC03-76SF00098. ALS, one of the first third generation synchrotron light sources which has been operating since 1992 at Berkeley Lab has been upgraded from its present operation scenario of injecting the 1.5GeV electron beam from the Booster ring into the Storage ring every 8 hours where it is accelerated to the final energy of 1.9GeV to full energy (1.9GeV) injection from the Booster ring into the Storage ring every 3 seconds for filling and every 30-35 seconds for Top-Off mode. Additionally the beam current has been increased from the time averaged value of 250mA to 500mA to increase the brightness. In this paper we will present the results of the new ALS injector RF system set-up for Top-Off mode of operation, the final design and operational results of the Booster RF power source and control system upgrades.

THXAB02	Current Status of the FAIR-project	dipole, ion, lattice, antiproton	2598
	D. Kramer
	Funding: Work supported by BMBF, State of Hessen and EU FP6 In 2006, GSI, together with a large international science community, presented the FAIR Baseline Technical Report (FBTR) on an unprecedented accelerator Facility for Antiproton and Ion beams Research in Europe, located in Darmstadt (Germany). This facility is based on extensive discussions and a broad range of workshops and working group reports, organized by the international user communities over a period of several years enabling unique experimental possibilities in the fields of nuclear- and astrophysics, hadron-, plasma and atomic physics as well as on applied physics. Following an in-depth evaluation of the proposal by the German Wissenschaftsrat and its recommendation to realize the facility, the Federal Government gave conditional approval for construction of FAIR in 2003. Since then the project has gone through major steps of development and significant progress has been achieved with regard to the scientific-technical and political preparation of the project under the governance of an international committee structure. The current status of the project will be reviewed.
	Slides

THPAN001	LOCO at the Australian Synchrotron	coupling, quadrupole, synchrotron, optics	3217
	M. J. Spencer M. J. Boland, R. T. Dowd, G. LeBlanc, Y. E. Tan ASP, Clayton, Victoria
	LOCO has been used during the commissioning of the Australian Synchrotron storage ring with a number of benefits. The LOCO (linear optics from close orbits) method compares a model response matrix to the real machine response matrix. Using this approach we are able to adjust the machine to match the ideal model. Results presented here show that LOCO has provided a high degree of control over a wide range of machine parameters.

THPAN044	Global COD Correction of SAGA-LS Storage Ring	lattice, controls, quadrupole, closed-orbit	3327
	H. Ohgaki Y. Iwasaki, T. Tomimasu SAGA, Tosu S. Koda, Y. Takabayashi, K. Yoshida Saga Synchrotron Light Source, Industry Promotion Division, Saga City
	SAGA Light Source is a medium size light source which has been operated from February, 2006. The stored beam orbit has been corrected by a closed orbit correction system consisted of 24 beam position monitors, 40 steering magnets and PC-LabView based control system. The singular value decomposition method has been applied for the global COD correction by using a measured response matrix. As a result, the standard deviation of the orbit error around the ring was reduced to 20 micro-meters both for horizontal plane and for vertical plane, respectively.

THPAN059	Proposal for an Enhanced Optical Cooling System Test in an Electron Storage Ring	electron, undulator, kicker, pick-up	3363
	E. G. Bessonov M. V. Gorbunkov LPI, Moscow A. A. Mikhailichenko Cornell University, Department of Physics, Ithaca, New York
	We are proposing to check experimentally the new idea of Enhanced Optical Cooling (EOC) in an electron storage ring. The experiment will confirm new fundamental processes in beam physics and demonstrate new unique possibilities in cooling technique. It will open important applications of EOC in nuclear physics, elementary particle physics and in light sources (LS) based on high brightness electron, proton, and ion beams.

THPAN078	An Elementary Analysis of Coupled-Bunch Instabilities	simulation, coupling, damping, impedance	3399
	K. M. Hock A. Wolski Liverpool University, Science Faculty, Liverpool
	We reconsider the equations of motion of wakefield coupled bunches in the light of recent developments in Delay Differential Equations. In the case of uniform resistive wall in a circular accelerator, we demonstrate an alternative way to obtain the growth rates. For each Fourier mode of bunch displacements, we show that multiple time domain modes can arise from an exact solution of the equation of motion. The growth rate as it is commonly defined corresponds to only one of them. The amplitude of each Fourier mode can therefore evolve with time in a way is not simply exponential. This is a result that has been observed in simulations of wakefield coupled bunches.

THPAN091	Spectral-Element Discontinuous Galerkin Simulations for Wake Potential Calculations: NEKCEM	simulation, impedance, coupling, electromagnetic-fields	3435
	M. Min Y.-C. Chae, P. F. Fisher ANL, Argonne, Illinois
	The demand for short bunches of 1 ps or less poses not only technical challenges in order to deliver the beams for leading-edge research but also poses computational challenges when it comes to investigating bunched multi-particle beam dynamics in order to improve the beam quality. We introduce a powerful high-order numerical tool based on spetral-element discretizations with discontinuous Galerkin approximation approach, which includes spectral element time domain solver for Maxwell's equation and electrostatic Poisson solver. We will demonstrate 3D simulations for wakefield and wake potential calculations in conducting cavity structures, as well as meshing and visualization components. We will discuss the overcome of the computational bottleneck by widely-used low-order finite difference programs for calculating wake field excited by 1-ps bunches, provided with performance and accuracy comparison.

THPAN098	Touschek Effect Calculation and Its Application to a Transport Line	scattering, beam-losses, emittance, coupling	3453
	A. Xiao M. Borland ANL, Argonne, Illinois
	Funding: Work supported by the U. S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357. The Touschek effect is a major concern for lepton storage rings of low emittance (i.e., high bunch density) and low or moderate beam energy, such as third-generation synchrotron light sources. Piwinski's formula, which includes beam shape variation along the beamline and which is suitable for any beam energy, has been incorporated into a program that interoperates with elegant for use in lifetime calculations. The difference between using Piwinski's method and other simplified methods for the APS is shown in this paper. Furthermore, because of the generality of this formula, we also applied it to transport lines to predict beam loss rates and beam loss locations for the first time. An example related to a possible energy recovery linac upgrade of the APS (APS-ERL) is also given in this paper.

THPAN118	Simulations of the Electron Cloud Buildups and Suppressions in Tevatron and Main Injector	electron, vacuum, simulation, proton	3504
	X. Zhang J.-F. Ostiguy Fermilab, Batavia, Illinois
	Funding: Work supported by the U. S. Department of Energy under Contract No. DE-AC02-76CH03000 To assess the effects of the electron cloud on Main Injector intensity upgrades, simulations of the cloud buildup were carried out using POSINST and compared with ECLOUD. Results indicate that even assuming an optimistic 1.3 maximum secondary electron yield, the electron cloud remains a serious concern for the planned future operational of mode of 500 bunches, 3·10¹¹ proton per bunch. Electron cloud buildup can be mitigated in various ways. We consider a plausible scenario involving solenoids in straight section and a single clearing strip electrode (like SNEG in Tevatron)held at a potential of 500V. Simulations with parameters corresponding to Tevatron and Main Injector operating conditions at locations where special electron cloud detectors have been installed have been carried out and are in satisfactory agreement with preliminary measurements.

THPAS062	Recent Progress in a Beam-Beam Simulation Code for Circular Hadron Machines	lattice, simulation, sextupole, beam-beam-effects	3627
	A. C. Kabel W. Fischer BNL, Upton, Long Island, New York T. Sen Fermilab, Batavia, Illinois
	Over the past years, we have developed a set of codes (PLIBB and NIMZOVICH) applicable to weak-strong and strong-strong beam-beam interactions in hadron machines. We have unified these codes into a single application and augmented the modeled physics to include arbitrary-order magnetic elements, noise sources and wire compensators; algorithmic improvements include diferential-algebraic methods, thick magnetic elements, and a fully-coupled, six-dimensional and symplectic treatment of lumped sections. A novel weighted-macroparticle approach allows for the immediate calculation of very low beam loss rates by particle tracking. The parallelization scheme of the code allows for a highly efficient simulation of colliders with a high number of parasitic crossings and/or pronounced hourglass effect in the IP. Areas of applicability include the LHC and the wire-compensation experiments performed at RHIC. Typical results will be presented.

THPAS066	CMAD: A New Self-consistent Parallel Code to Simulate the Electron Cloud Build-up and Instabilities	electron, simulation, lattice, damping	3636
	M. T.F. Pivi
	Funding: Work supported by the Director, Office of Science, High Energy Physics, U. S. DOE under Contract No. DE-AC02-76SF00515. We present the features of CMAD, a newly developed self-consistent code which simulates both the electron cloud build-up and related beam instabilities. By means of parallel (Message Passing Interface - MPI) computation, the code tracks the beam in an existing (MAD-type) lattice and continuously resolve the interaction between the beam and the cloud at each element location, with different cloud distributions at each magnet location. CMAD simulates single-and coupled-bunch instability, allows tune shift, dynamic aperture and frequency map analysis and the determination of the secondary electron yield instability threshold. Preliminary results are presented.

THPAS070	Validation of PEP-II Resonantly Excited Turn-by-Turn BPM Data	optics, coupling, lattice, betatron	3645
	Y. T. Yan Y. Cai, W. S. Colocho, F.-J. Decker SLAC, Menlo Park, California
	Funding: Work supported by US DOE un contract No. DE-AC02-76SF00515 For optics measurement and modeling of the PEP-II electron (HER) and position (LER) storage rings, we have been doing well with MIA* which requires analyzing turn-by-turn Beam Position Monitor (BPM) data that are resonantly excited at the horizontal, vertical, and longitudinal tunes respectively. However, in anticipating that certain BPM buttons or even pins in the PEP-II IR region will be missing for the next run starting in January 2007, we have been developing a data validation process, hoping to reduce the effect due to the reduced BPM data accuracy on PEP-II optics measurement and modeling. Besides the routine process for ranking BPM noise level through data correlation among BPMs, allowing BPMs to have linear gains and linear cross couplings, we can also check BPM data symplecticity by comparing the invariant ratios. We may also work out nonlinear BPM data correction if needed. Results on PEP-II measurement will be presented. * Y. T. Yan, et. al. EPAC06 Proceedings, WEPCH062, (2006)

THPAS105	Stern-Gerlach Force on a Precessing Magnetic Moment	radio-frequency, dipole	3729
	M. Conte A. U. Luccio, W. W. MacKay BNL, Upton, Long Island, New York M. Pusterla Univ. degli Studi di Padova, Padova
	The use of the Stern-Gerlach interaction for attaining the spin-states separation of an (anti)proton beam circulating in a ring is reconsidered in a new method where the particle magnetic moments are made to precess while they are undergoing energy exchanges, either positive or negative, with the e.m. fields of an array of radio frequency resonators tuned in the Transverse Electric mode. This proposal represents an improvement with respect to cases considered in the past when the magnetic moments were conserving their directions in space.

FRYKI01	Radidly-Cyling Superconducting Accelerator Magnets for FAIR at GSI	dipole, synchrotron, cryogenics, antiproton	3745
	G. Moritz
	The demand for high beam intensities leads to the requirement of rapidly cycling cycling magnets for synchrotrons. An example is FAIR (Facility for Antiproton and Ion Research) at GSI, which will consist of two synchrotrons (SIS 100 and SIS 300) in one tunnel and several storage rings. The high field ramp rate (up to 1 T/s) and the repetition frequency of up to 1 Hz require R&D for the superconducting magnets of these rings. Persistent currents in the superconductor and eddy currents in wire, cable, iron and vacuum chamber reduce the field quality and generate cryogenic losses. A magnet lifetime of 20 years is desired, resulting in up to 108 magnet cycles. Therefore, special attention has to be paid to magnet material fatigue problems. R&D work is being done, in collaboration with many institutions, to reach the requirements mentioned above. Model dipoles were built and tested. The results of the R&D are reported. Full length dipoles for SIS 100 are under construction.
	Slides

FROBC04	Thermomechanical Design of Normal-Conducting Deflecting Cavities at the Advanced Photon Source for Short X-ray Pulse Generation	undulator, controls, vacuum, coupling	3827
	B. Brajuskovic J. T. Collins, P. K. Den Hartog, L. H. Morrison, G. J. Waldschmidt ANL, Argonne, Illinois
	Funding: Work supported by U. S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357 A normal-conducting deflecting cavity is being designed at the Advanced Photon Source (APS) as a part of the short x-ray pulse project intended to provide users with approximately 2 picosecond x-rays. The system will use two pairs of 3-cell cavities in sectors 6ID and 7ID for the generation of the x-ray pulse in the 7ID beamline. The 3-cell cavities are designed to provide the desired beam deflection while absorbing in excess of 4 kW of power from a pulsed rf system and up to 2.6 kW in the damper system of high-order mode (HOM) and low-order mode (LOM) waveguides. Since the cavity frequency is very sensitive to thermal expansion, the cooling water system is designed so that it is able to control cavity temperature to within 0.1?C. This paper describes the optimization of the thermomechanical design of the cavity based on calculation of thermal stresses and displacement caused by the generated heat loads, and presents the design of a cooling water system required for the proper operation of the cavities.
	Slides

FRPMN002	Preliminary Studies for Top-up Operations at the Australian Synchrotron	synchrotron, injection, diagnostics, electron	3856
	M. J. Boland D. J. Peake ASP, Clayton, Victoria R. P. Rassool Melbourne
	The Australian Synchrotron is now a fully commissioned synchrotron light source providing beam for users. With the facility now fully operational, the next major advancement in machine operations will be top-up mode. The advantages of running top-up are well documented by other third generation light sources; in broad terms it leads to a better quality beam for users and better experimental results. An overview will be given of the top-up runs that have been conducted and the instrumentation that was used. It has been demonstrated that top-up operation is possible, however improvements in injection efficiency and beam stability during injection are required before this can become a routine mode of operation.

FRPMN003	Measurements of Impedance and Beam Instabilities at the Australian Synchrotron	impedance, single-bunch, diagnostics, synchrotron	3859
	R. T. Dowd M. J. Boland, G. LeBlanc, M. J. Spencer, Y. E. Tan ASP, Clayton, Victoria J. M. Byrd, F. Sannibale LBNL, Berkeley, California
	In this paper we present the first measurements of machine impedance and observed beam instabilities at the Australian Synchrotron. Impedance measurements are made by studying the single bunch behaviour with beam current, using optical and X-ray diagnostic beamlines. An observed coupled-bunch instability, its cause and cure is also discussed.

FRPMN004	Storage Ring Turn-By-Turn BPMs At The Australian Synchrotron	coupling, synchrotron, injection, simulation	3865
	Y. E. Tan M. J. Boland, R. T. Dowd, G. LeBlanc, M. J. Spencer ASP, Clayton, Victoria
	The Australian Synchrotron's Storage Ring is equipped with a full compliment of 98 Libera Electron Beam Position Processors from I-Tech (EBPPs) [1]. The EBPPs are capable of measuring beam position data at turn-by-turn (TBT) rates and have long history buffers. TBT data from the EBPPs has been used to determine the linear optics of the storage ring lattice using techniques developed at other facilities. This is a useful complement to other methods of determining the linear optics such as LOCO. Characteristics of the EBPPs such as beam current dependence have been studied during commissioning and will also be presented.

FRPMN005	Design of Button Beam Position Monitor for the Brazilian Synchrotron Light Source	impedance, vacuum, coupling, synchrotron	3871
	S. R. Marques O. R. Bagnato, R. H.A. Farias, M. J. Ferreira, J. B. Gonzalez, C. Rodrigues, P. F. Tavares LNLS, Campinas
	We present the electric and mechanical design of a button beam position monitor (BPM) recently developed and installed in the UVX electron storage ring at the Brazilian Synchrotron Light Laboratory (LNLS). The first commissioning results will also be presented. This development started when we observed strong correlation between false stripline BPM readings and the external temperature of this BPM. Simulations indicate that the temperature gradient in the BPM body can cause deformations that could explain the false readings in some BPMs. The small dimension of the button compared to the stripline and the better thermal isolation between the button and the BPM body should contribute to minimize this problem.

FRPMN013	Precise Tune Measurements from Multiple Beam Position Monitors	optics, lattice, synchrotron, simulation	3913
	Ch. Skokos J. Laskar IMCCE, Paris Y. Papaphilippou CERN, Geneva
	Funding: Work supported by the Marie Curie Intra-European Fellowship No MEIF-CT-2006-025678 One of the main limitations for precise tune measurements using kicked turn-by-turn data is the beam decoherence, which can limit the available signal to a reduced number of turns. Applying Laskar's frequency analysis, on measurements from several beam position monitors, a fast and accurate determination of the real tune is possible. The efficiency of the method is demonstrated when applied in turn-by-turn data from the ESRF storage ring and CERN's Super Proton Synchrotron. Estimates from tracking simulations and analytical considerations are further compared with the experimental results.

FRPMN021	Investigation of the Injection into the ANKA Storage Ring by a Turn by Turn BPM System	injection, kicker, booster, septum	3958
	E. Huttel I. Birkel, A.-S. Muller, P. Wesolowski FZK, Karlsruhe
	Modern BPM Electronics allow turn by turn acquisition of the position for both the injected and stored beam. This offers additional opportunities for diagnostics. In addition to the slow acquisition system installed at ANKA, two LIBERA ELECTRON units (www.i-tech.si) have been installed. I. E. the system was used to investigate and optimize the Injection. The stray field of the Septum causes a bump of the stored beam. The settings of the Kicker could be optimized for minimized the orbit distortion. By measuring the phase space of the injected beam the injection efficiency will be improved.

FRPMN022	Analysis of Multi-Turn Beam Position Measurements in the ANKA Storage Ring	damping, kicker, sextupole, electron	3964
	A.-S. Muller I. Birkel, E. Huttel, P. Wesolowski FZK, Karlsruhe
	The observation of betatron oscillations following a deflection by a kicker pulse offers the possibility to study various machine parameters. The damping of the centre-of-charge signal's amplitude for one bunch, for example, depends chromaticity, energy loss, momentum compaction factor and impedance. A new multi-turn acquisition system based on LIBERA ELECTRON units (http://www.i-tech.si) has been installed in the ANKA storage ring. First analyses of the thus acquired data for different machine conditions reveal systematic limitations in the current ANKA multi-turn setup. Measurements preformed under varying conditions are presented and discussed with respect to the influence on future analysis. * http://www.i-tech.si

FRPMN025	Review of the Longitudinal Impedance Budget of the ELETTRA Storage Ring	impedance, closed-orbit, vacuum, electron	3976
	G. Penco C. Bontoiu, P. Craievich, V. Forchi', E. Karantzoulis ELETTRA, Basovizza, Trieste
	Changes in the longitudinal impedance budget occur due to the changes in the machine structure. In this paper we update the longitudinal impedance budget of Elettra following the installation of the new vacuum chambers in the last three years. The measurements are performed by mapping the horizontal closed orbit deviation in single bunch operation mode, taking full advantage of the newly installed high resolution BPM electrons system. The current results are compared with those of the previous measurements.

FRPMN031	Commissioning and Status of New BPM Electronics for COD Measurement at the SPring-8 Storage Ring	pick-up, controls, injection, target	3997
	T. Fujita S. Sasaki, M. Shoji, T. Takashima JASRI/SPring-8, Hyogo-ken
	At SPring-8 storage ring, a signal processing circuit for closed orbit measurement and a part of its control system were replaced during summer shutdown period of 2006. In the new circuit, one of four beam signals at the frequency of 508.58 MHz, which is the acceleration frequency of the SPring-8, is selected by a multiplexer and down-converted to IF frequency. The IF signal is sampled by 2 MSPS 16-bit ADC and detected with DSP. On the DSP, spurious frequencies are eliminated by digital filter and effective band-width can be changed by averaging. During the commissioning of the new circuit after the summer shutdown, DSP parameters such as number of averaging were decided to measure beam positions at all BPMs in 3 seconds, although the new circuit was designed with a target repetition of a few 10 Hz or around 100 Hz with resolution of sub-microns. With the DSP parameters, position resolution of less than 0.5 micron is achieved. In this paper, we also describe long term stability, current dependence and beam filling pattern dependence of the new circuit compared with the old one in addition to the position resolution and measurement repetition.

FRPMN032	On Skew Nonlinear Resonance in the SPring-8 Storage Ring	resonance, coupling, sextupole, betatron	4003
	M. Takao M. Masaki, J. Schimizu, K. Soutome, S. Takano JASRI/SPring-8, Hyogo-ken
	Recently we accomplish the matrix formulation for the canonical perturbation theory of the linear betatron coupling resonance. By merging the perturbation theory with the matrix formalism, we manifest the symplectic structure of the former theory, and conversely derive the analytical representation for the latter. The formulation for the coupled betatron motion implies that the linear coupling causes the excitation of skew resonances by nonlinear fields with mid-plane symmetry. This effect is visible in the vicinity of the linear coupling resonance, which is observed in the SPring-8 storage ring, for example, as the blow-up of the vertical beam size on the third order skew coupling resonance. For the purpose of studying the impacts of the skew nonlinear resonance on the beam dynamics, we investigate the characteristic behavior of the resonance expected by the matrix formulation.

FRPMN039	Measurement of Quadrupolar Tune Shifts After the Reconstruction of the Photon Factory Storage Ring	quadrupole, betatron, factory, photon	4039
	S. Sakanaka T. Mitsuhashi, T. Obina KEK, Ibaraki
	The tune shift of transverse quadrupolar oscillations is a measure of a quadrupolar component of wakefields in the storage ring. By measuring both dipolar and quadrupolar tune shifts, one can estimate the dipolar and the quadrupolar components of wakefields (exactly, kick factors) independently. We carried out such measurements before and after the upgrade of the Photon Factory storage ring. The results showed the change in the tune shifts which were caused by the replacement of many (about two-thirds of the ring) vacuum chambers. S. Sakanaka, T. Mitsuhashi, and T. Obina, Phys. Rev. ST Accel. Beams 8, 042801 (2005).

FRPMN052	Bunch Length Measurement in Time Domain for HLS	synchrotron, optics, radiation, electron	4108
	B. Y. Wang P. Lu, B. Sun, J. Wang, J. H. Wang, H. Xu USTC/NSRL, Hefei, Anhui
	Funding: Supported by the Natural Science Foundation of China (10675118) and by Knowledge Innovation Project of CAS A simple measurement method of beam bunch length in time domain for HLS (Hefei Light Source) has been proposed. The Bunch length measurement system is composed of an optical system, a high speed photo-receiver and a wide bandwidth oscilloscope. The photo-receiver which is made by FEMTO has high sensitivity and high bandwidth, which converts the synchrotron radiation light into electronic signal. The oscilloscope which is made by Tektronix is TDS7704B, which has a high bandwidth up to 7GHz and show the bunch length in time domain. The measurement results of the bunch length and its analysis are given. We compare the results with that determined by the conventional method using a streak camera.

FRPMN081	A Preliminary Study of Beam Instabilities in Top-up Operation at Taiwan Light Source	feedback, ion, vacuum, synchrotron	4246
	P. J. Chou H.-P. Chang, K. T. Hsu, K. H. Hu, C.-C. Kuo, G.-H. Luo, M.-H. Wang NSRRC, Hsinchu
	The storage ring of Taiwan Light Source started to operate fully in top-up mode since October 2005. The beam current has been gradually increased to 300 mA in routine user operation. Phenomena of collective effects were observed at 300 mA in top-up operation mode. Active feedback systems were implemented to stabilize the beam in top-up mode. Results of beam observation and analysis will be presented.

FRPMN082	Diagnostic and Timing Supports for Top-Up Injection Operation for the TLS	injection, diagnostics, controls, synchrotron	4252
	J. Chen P. C. Chiu, K. T. Hsu, S. Y. Hsu, K. H. Hu, C. H. Kuo, D. Lee, C.-J. Wang, C. Y. Wu NSRRC, Hsinchu
	Routine top-up operation of Taiwan Light Source (TLS) was started from October 2005 after high efficiency multi-bunch instabilities suppression system put into service. To support the top-up operation, various diagnostics and timing supports are needed. These include diagnostics for injection efficiency, filling pattern of the storage ring, tune, instability, loss pattern measurement. Timing control of the injection process are also needed. Design consideration and details of these efforts will be summary in this report. Further possible improvement will be also discussed.

FRPMN103	Single-Bunch Instability Estimates for the 1-nm APS Storage Ring Upgrade with a Smaller Vacuum Chamber	impedance, lattice, single-bunch, simulation	4330
	Y.-C. Chae Y. Wang, A. Xiao ANL, Argonne, Illinois
	Funding: Work supported by the U. S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357. We recently studied a lattice achieving 1-nm emittance at the APS storage ring. The successful design required very strong sextupoles in order to tune the machine to the desired positive chromaticity. A preliminary design of such magnets indicated saturation in the poles unless the vacuum chamber gets smaller by a factor of two compared to the existing APS chamber. Since the resistive wall impedance scales as 1/b3, where b is the radius of the chamber, we questioned how much current we can store in a single bunch at the 1-nm storage ring. In order to answer this question quantitatively, we calculated all wake potentials of impedance elements of the existing APS storage ring with the transverse dimension properly scaled but with the longitudinal dimension kept unchanged. With the newly calculated impedance of a smaller chamber, we estimated the single-bunch current limit. It turned out that the ring with a smaller chamber would not diminish the single-bunch current limit substantially. We present both wake potentials of 1-nm and the existing rings followed by the simulation results carried out for determining the accumulation limit to the ring. A. Xiao, "A 1-nm Lattice for the APS Storage Ring" these proceedings.

FRPMN104	Impedance Database II for the Advanced Photon Source Storage Ring	impedance, simulation, single-bunch, photon	4336
	Y.-C. Chae Y. Wang ANL, Argonne, Illinois
	Funding: Work supported by the U. S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357. The first Impedance Database* constructed at the Advanced Photon Source was successfully used in reproducing the main characteristics of single-bunch instabilities observed in the storage ring. However, the finite bandwidth of the corresponding impedance model was limited to 25 GHz, which happens to be the resolution limit of the density modulation observed in the microwave instability simulation. In order to resolve simulation results never verified in the experiments, we decided to extend the calculated bandwidth of impedance to 50 GHz by recalculating the wake potentials excited by a shorter bunch. Since low-order electromagnetic code requires 20-40 grid points per wavelength, reducing the bunch length required a large number of grids for the 3D structure. We used bunch lengths of 1- and 2-mm in the Gaussian distribution in the Impedance Database II project. For the large-scale computation we used the 3D electromagnetic code GdfidL ** for wake potential calculation at the cluster equipped with 240 GB of memory. The resultant wake potential excited by the short bunch together with application to the storage ring for collective effects is presented in the paper. * Y.-C. Chae, "The Impedance Database and Its Application to the APS Storage Ring" Proc. 2003 PAC, p. 3017.** http://www.gdfidl.de

FRPMN105	The Wakefield Effects of Pulsed Crab Cavities at the Advanced Photon Source for Short-X-ray Pulse Generation	single-bunch, impedance, simulation, photon	4339
	Y.-C. Chae V. A. Dolgashev SLAC, Menlo Park, California G. J. Waldschmidt ANL, Argonne, Illinois
	Funding: Work supported by the U. S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357. In recent years we have explored the application to the Advanced Photon Source (APS) of Zholents' crab-cavity-based scheme for production of short x-ray pulses. As a near-term project, the APS has elected to pursue a pulsed system using room-temperature cavities. The cavity design has been optimized to heavily damp parasitic modes while maintaining large shunt impedance for the deflecting dipole mode. We evaluated a system consisting of three crab cavities as an impedance source and determined their effect on the single- and multi-bunch instabilities. In the single-bunch instability we used the APS impedance model as the reference system in order to predict the overall performance of the ring when the crab cavities are installed in the future. For multi-bunch instabilities we used a realistic fill pattern, including hybrid-fill, and tracked multiple bunches where each bunch was treated as soft in distribution. To verify the electrical design, the realistic wake potential of the 3D structure was calculated using GdfidL and this wake potential was used in the multi-bunch simulations. M. Borland et al., "Planned Use of Pulsed Crab Cavities at the APS for Short X-ray Pulse Generation," these proceedings.** V. Dolgashev et al., "RF Design of Normal Conducting Deflecting Structures for the APS," these proceedings.

FRPMN109	200-mA Studies in the APS Storage Ring	impedance, kicker, vacuum, injection	4354
	K. C. Harkay Y.-C. Chae, L. Emery, L. H. Morrison, A. Nassiri, G. J. Waldschmidt ANL, Argonne, Illinois
	Funding: Work supported by U. S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357. The Advanced Photon Source storage ring is normally operated with 100 mA of beam current. A number of high-current studies were carried out to determine the multibunch instability limits. The longitudinal multibunch instability is dominated by the rf cavity higher-order modes (HOMs), and the coupled-bunch instability (CBI) threshold is bunch-pattern dependent. We can stably store 200 mA with 324 bunches, and the CBI threshold is 245 mA. With 24 bunches, several components are approaching temperature limits above 160 mA, including the HOM dampers. We do not see any CBI at this current. The transverse multibunch instabilities are most likely driven by the resistive wall impedance; there is little evidence that the dipole HOMs contribute. Presently, we rely on the chromaticity to stabilize the transverse multibunch instabilities. When we stored beam up to 245 mA, we used high chromaticity, and the beam was transversely stable. The stabilizing chromaticity was studied as a function of current. We can use these experimental results to predict multibunch instability thresholds for various upgrade options, such as smaller-gap or longer ID chambers and the associated increased impedance.

FRPMN115	A Novel FPGA-Based Bunch Purity Monitor System at the APS Storage Ring	electron, photon, controls, injection	4384
	W. E. Norum B. X. Yang ANL, Argonne, Illinois
	Funding: Work supported by U. S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357 Bunch purity is an important source quality factor for the magnetic resonance experiments at the Advanced Photon Source. Conventional bunch-purity monitors utilizing time-to-amplitude converters are subject to dead time. We present a novel design based on a single field-programmable gate array (FPGA) that continuously processes pulses at the full speed of the detector and front-end electronics. The FPGA provides 7778 single-channel analyzers (six per RF bucket). The starting time and width of each single-channel analyzer window can be set to a resolution of 178 ps. A detector pulse arriving inside the window of a single-channel analyzer is recorded in an associated 32-bit counter. The analyzer makes no contribution to the system dead time. Two channels for each RF bucket count pulses originating from the electrons in the bucket. The other four channels on the early and late side of the bucket provide estimates of the background. A single-chip microcontroller attached to the FPGA acts as an EPICS IOC to make the information in the FPGA available to the EPICS clients.

FRPMN116	Status of the RF BPM Upgrade at the Advanced Photon Source	controls, feedback, instrumentation, power-supply	4390
	A. Pietryla H. Bui, G. Decker, R. Laird, R. M. Lill, W. E. Norum ANL, Argonne, Illinois
	Funding: Work supported by the U. S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357. The Advanced Photon Source (APS), a third-generation synchrotron light source, has been in operation for twelve years. The monopulse radio frequency (rf) beam position monitor (BPM) is one of three BPM types now employed in the storage ring at the APS. It is a broadband (10 MHz) system designed to measure single-turn and multi-turn beam positions, but it suffers from an aging data acquisition system. The replacement BPM system retains the existing monopulse receivers and replaces the data acquisition system with high-speed analog-to-digital converters (ADCs) and a field-programmable gate array (FPGA) that performs the signal processing. A first article system has been constructed and is currently being evaluated. This paper presents the results of testing of the first article system as well as the progress made in other areas of this upgrade effort.

FRPMN120	Tuning the Narrow-band Beam Position Monitor Sampling Clock to Remove the Aliasing Errors in APS Storage Ring Orbit Measurements	feedback, photon, controls	4402
	X. Sun O. Singh ANL, Argonne, Illinois
	Funding: Work supported by the U. S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357. The Advanced Photon Source storage ring employs a real-time orbit correction system to reduce orbit motion up to 50 Hz. This system uses up to 142 narrow-band rf beam position monitors (Nbbpms) in a correction algorithm by sampling at a frequency of 1.53 kHz. Several Nbbpms exhibit aliasing errors in orbit measurements, rendering these Nbbpms unusable in real-time orbit feedback. The aliasing errors are caused by beating effects of the internal sampling clocks with various other processing clocks residing within the BPM electronics. A programmable external clock has been employed to move the aliasing errors out of the active frequency band of the real-time feedback system (RTFB) and rms beam motion calculation. This paper discusses the process of tuning and provides test results.

FRPMS020	Optical Beam Timing Monitor Experiments at the Advanced Light Source	laser, instrumentation, diagnostics, pick-up	3952
	S. De Santis J. M. Byrd, R. B. Wilcox LBNL, Berkeley, California Y. Yin Y. Y. Labs, Inc., Fremont, California
	Funding: Work supported by the U. S. Department of Energy under Contract No. DE-AC0-05CH11231. We present the results of an experimental study of a beam timing monitor based on a technique demonstrated by Loehl. This technique uses the electrical signal from a beam position monitor to amplitude-modulate a train of laser pulses, converting timing jitter into an amplitude jitter. This modulation is then measured with a photodetector and sampled by a fast ADC. This approach has already demonstrated sub-100 fsec resolution and promises even better results. Our study focuses on the use of this technique for precision timing for storage rings. We show results of measurements using signals from the Advanced Light Source. F. Loehl, et al., Proc. of the 2006 EPAC., p. 2781.

FRPMS039	Growth Time of Longitudinal Coupled Bunch Mode Instability in the Duke FEL Facility	kicker, feedback, damping, electron	4036
	Y. Kim J. Li, Y. K. Wu FEL/Duke University, Durham, North Carolina
	To determine the required power of an RF amplifier for the longitudinal feedback system (LFS), the growth time of the longitudinal coupled bunch mode instability (CBMI) in the Duke storage ring should be known in advance. In 2005, we measured the longitudinal beam instability with four and eight symmetrically filled buckets in the Duke storage ring. By analyzing measured data, the growth time of the longitudinal CBMI can be estimated. At a beam energy of 274 MeV, the projected growth time is about 0.37 ms for a total stored current of 160 mA. To damp harmful longitudinal CBMI with a relative energy deviation of 0.1% (rms) within the growth time, a sufficient RF power of 135 W (rms) should be delivered to an LFS kicker at a central frequency of 758.8375 MHz. In this paper, we describe measurements of the growth time and the estimation of the RF power requirement for the LFS.

FRPMS040	BPM signal conditioning for a wide range of single bunch current operation in Duke storage ring	single-bunch, pick-up, booster, synchrotron	4042
	J. Li P. Wang, Y. K. Wu FEL/Duke University, Durham, North Carolina
	Funding: Supported by US DoE grant #DE-FG02-01ER41175. The beam position monitor system of the Duke storage ring has been in operation since 1998. Recently, by injecting at higher energy with a booster synchrotron, the single bunch current threshold is much more increased. This makes the BPM system do not work properly and rises the risk to damaged the BPM signal processing modules. To get reliable orbit data and protect the BPM modules, we carefully studied the BPM signal, and then found a way to overcome this problem. This paper will report the study results and the solution method.

FRPMS041	A Direct Electron Beam Energy Spread Measurement System for Beam Instability and FEL Research	electron, wiggler, klystron, radiation	4045
	S. Huang, S. Huang PKU/IHIP, Beijing J. Li, Y. K. Wu FEL/Duke University, Durham, North Carolina
	Funding: Supported by US AFOSR MFEL grant #FA9550-04-01-0086. One of critical beam parameters for the storage ring based light sources is the energy spread of the electron beam. An accurate measurement of the energy spread remains a challenge. It is well known that the electrons with different energies can degrade the spontaneous emission spectrum of a two-wiggler system in an optical-klystron configuration. The reduced modulation in the spectrum can be used to determine the energy spread of the beam. This paper describes our newly developed energy spread measurement system employing a scanning spectrometer and a fast CCD. A fast CCD with a burst mode of operation is used so that dynamical changes of the energy spread from tens of microseconds to tens of milliseconds can be measured. This system will be used in the beam instability research and free-electron laser research. Together with compact wigglers, such a system can be developed as a dedicated beam diagnostic for storage rings and linacs.

FRPMS042	Electron Beam Diagnostics for Compact 1.2 GeV Booster Synchrotron	booster, synchrotron, diagnostics, linac	4051
	V. Popov M. D. Busch, S. M. Hartman, J. Li, S. F. Mikhailov, P. W. Wallace, P. Wang, Y. K. Wu FEL/Duke University, Durham, North Carolina G. Y. Kurkin BINP SB RAS, Novosibirsk
	Funding: Supported by US DoE grant #DE-FG02-01ER41175. First operational experience has been gained with the linac and booster diagnostic system during the commissioning of the booster synchrotron at Duke University. Beam charge measurements are provided by Faraday cups, Integrated Current Transformers (ICT) and Modular Parametric Current Transformer (MPCT). Beam position monitoring is based on BPM system delivered from Bergoz company. Betatron tune measurements use synchrotron radiation (SR) and are different for two modes of operation: stored beam and energy ramping. Transverse profile and temporal beam structure monitoring employ insertable screens, CCD cameras, striplines and dissector. The diagnostics provided good understanding of electron beam behavior and allowed to adjust important beam parameters within design specifications. An overview of the diagnostic instrumentation of the Duke linac and booster synchrotron is given along with measurement examples and discussion of operational experience.

FRPMS044	A Tune Measurement System for Low Current and Energy Ramping Operation of a Booster Synchrotron	booster, synchrotron, electron, betatron	4063
	Y. K. Wu J. Li, S. F. Mikhailov, V. Popov, P. Wang FEL/Duke University, Durham, North Carolina
	Funding: This work is supported by the US AFOSR MFEL grant #FA9550-04-01-0086 and by U. S. DOE grant DE-FG05-91ER40665. The betatron tune measurement system is one of the most important diagnostics for any circular accelerator. During the commissioning of a booster synchrotron newly developed for top-off injection into the Duke storage ring, a versatile tune measurement system employing a photomultiplier tube (PMT) and a space filter has been developed to provide reliable measurements for low current operation at a few micro-amperes of beam-current. Using the turn-by-turn technique, this tune measurement system is being used as a live tune monitor during the booster energy ramping. This system has also be used to measure chromaticity and other important beam parameters. In this paper, we describe the tune measurement system in detail and report our most recent experimental results using this system.

FRPMS046	Optical-Fiber NOTCH Filter for Storage Ring Transverse Feedback System	feedback, insertion, laser, betatron	4075
	Y. Yin X. Che Y. Y. Labs, Inc., Fremont, California J. H. Wang, K. Zheng USTC/NSRL, Hefei, Anhui
	An optical-fiber two-tap FIR filter has been developed for storage ring transverse feedback system. The optical FIR filter has advantage of low loss which is not related to the size of the storage ring, and high-frequency response, compact in size. Measurements have been done with storage ring beam signal. The paper will present the principle and the experimental results.

FRPMS102	Preliminary Impedance Budget for the NSLS-II Storage Ring	impedance, vacuum, undulator, electron	4321
	A. Blednykh S. Krinsky BNL, Upton, Long Island, New York
	Extensive calculations have been performed of the wakefield and impedance produced by the storage ring components for the rms bunch length of 3mm. Calculated data are presented for the NSLS-II storage ring components such as dipole vacuum chamber, quadrupole vacuum chamber, sextupole vacuum chamber, tapered elliptic vacuum chamber for superconducting undulator, cryo permanent magnet mini-gap undulator, CESR-B RF cavity, beam position monitor, infrared beam extraction chamber and resistive wall. The loss factor, the kick factor and imaginary part of the longitudinal impedance at low frequency divided by harmonic number are given per component and have been entered into a table.

FRPMS103	Coupling Impedance of the CESR-B RF Cavities for the NSLS-II Storage Ring	impedance, coupling, vacuum, damping	4327
	A. Blednykh S. Krinsky, J. Rose BNL, Upton, Long Island, New York
	CESR-B type superconducting cavities are under discussion for acceleration of the electron beam in the 3-GeV NSLS-II storage ring. In this paper we present a detailed investigation of longitudinal and transverse impedances of the cavity and transition assembly. Ferrite material is included in impedance analysis. Its effect on the short range wakepotential has been studied using the GdfidL code. Results of loss factors and kick factors are presented for a 3mm rms bunch length.

FRPMS104	Impedance of Electron Beam Vacuum Chambers for the NSLS-II Storage Ring	impedance, vacuum, extraction, dipole	4333
	A. Blednykh S. Krinsky BNL, Upton, Long Island, New York
	In this paper we discuss computation of the coupling impedance of the vacuum chambers for the NSLS-II storage ring using the electromagnetic simulator GdfidL. The impedance of the vacuum chambers depends on the geometric dimensions of the cross-section and height of the slot in the chamber wall. Of particular concern is the complex geometry of the infrared extraction chambers to be installed in special large-gap dipole magnets. In this case, wakefields are generated due to tapered transitions and large vertical-aperture ports with mirrors near the electron beam.