PAC07 - List of Keywords (undulator)

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undulator

Paper	Title	Other Keywords	Page
MOZBAB01	Review of the Worldwide SASE FEL Development	electron, radiation, vacuum, cathode	89
	T. Shintake
	Talk will review the worldwide efforts towards VUV and X-ray SASE FELs,including low emittance electron source, linear accelerator, bunch compressor, undulator, beam diagnostics, alignment, and control, facility building and seeding technology.
	Slides

MOZBAB02	Short Wavelength SASE FEL: Experiment vs. Theory	electron, radiation, resonance, simulation	94
	J. Rossbach
	Since 2005, the Free-Electron Laser FLASH at DESY delivers radiation pulses with unprecedented parameters to scientific users. Pulses in the 10 femtosecond range are produced at record wavelengths as short as 13 nanometers. Operating in the FEL saturation regime at the Gigawatt level, even higher harmonics are generated that are powerful enough to be attractive for users. Radiation pulses and the properties of electron bunches have been characterized in quite some detail. Based on these results, the state of the art of detailed comparison between the theory and experiment of short wavelength SASE FELs will be presented.
	Slides

MOPAN004	Commissioning of the LNLS Elliptically Polarizing Undulator	storage-ring, 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.

MOPAN022	Investigation of Machine Operation and Related Radiation Dose at the ANKA Storage Ring	radiation, wiggler, storage-ring, 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.

MOPAN023	Superconductive Damping Wigglers for the CLIC Project	wiggler, damping, emittance, radiation	200
	R. Rossmanith T. Baumbach, A. Bernhard, A.-S. Muller, D. Wollmann University of Karlsruhe, Karlsruhe H.-H. Braun, M. Korostelev, Y. Papaphilippou, F. Zimmermann CERN, Geneva S. Casalbuoni, A. W. Grau, M. Hagelstein, B. K. Kostka FZK, Karlsruhe E. Mashkina, E. Steffens University of Erlangen-Nurnberg, Physikalisches Institut II, Erlangen
	The CLIC damping ring requires wigglers with both high on-axis fields and short periods. The present design foresees a superconductive wiggler with a period length of 5 cm, a peak on-axis field of 2.5 T and a full width aperture of 12 mm. In this paper we explore the performance improvements of the damping ring when these parameters are pushed to 2.7 T at a period length of 2 cm with the expense of a reduced aperture of 5 mm. A design for a prototype for testing the field quality of such a wiggler is presented in this paper and the possibility to test this wiggler with beam in the storage ring ANKA is described.

MOPAN115	Aluminum Coating in the Undulator Vacuum Chamber for the LINAC Coherence Light Source	cathode, vacuum, power-supply, linac	437
	D. R. Walters
	Funding: Work supported by DOE under contract Nos. DE-AC02-06CH11357 and DE-AC03-76SF00515. A prototype vacuum chamber is under development at the Advanced Photon Source for use in the Linac Coherent Light Source at Stanford Linear Accelerator Center. The chamber will be fabricated from the austenite stainless steels. The chamber requires a continuous aluminum coating on the inner surface in order to reduce the wakefield losses to a level within the resistivity budget. The method being presented here is unique in that it can be applied to a fully fabricated chamber 5 mm high, 11.5 mm wide, and 3460 mm long. In existing methods the chamber aperture has been much larger than is used here. This paper describes a method applicable for these smaller cross sections. This process uses a pair of small electrodes, centered in the aperture, where they are attached to a high frequency AC power supply. In this configuration each electrode is connected to the opposite polarity of the other. The chamber cavity is filled with argon gas to facilitate the formation of a glow discharge causing the aluminum electrodes to sputter onto the chamber walls. This paper presents the laboratory test results from small samples up to the full-sized assemblies.

MOPAS103	Optical Parametric Amplifier Test for Optical Stochastic Cooling of RHIC	radiation, laser, ion, pick-up	667
	P. I. Pavlishin M. Babzien, I. Pogorelsky, D. Stolyarov, V. Yakimenko BNL, Upton, Long Island, New York M. S. Zolotorev LBNL, Berkeley, California
	Funding: Work supported by US Department of Energy contract DE-AC02-98CH10886 Optical stochastic cooling for the Relativistic Heavy Ion Collider (RHIC) based on optical parametric amplification was proposed by M. Babzien et al., Phys. Rev. ST Accel. Beams v.7, 012801, (2004). According to this proposal a CdGeAs2 nonlinear crystal is used as an active medium for the optical parametric amplifier because of extremely large nonlinear coefficient, wide transparency range, and possibility to be phase matched over the required spectral range. We discuss experimental results of the parametric amplifier gain and coherency for the conditions applicable to optical stochastic cooling for RHIC.

TUPMN001	The Australian Synchrotron Project	synchrotron, storage-ring, vacuum, injection	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.

TUPMN004	Final Adjustment of the Magnetic Field of the LNLS VUV Undulator.	multipole, radiation, insertion, insertion-device	917
	G. Tosin R. Basilio, J. F. Citadini, M. Potye LNLS, Campinas
	The first insertion device built at LNLS was an elliptically polarized undulator, designed to cover the vacuum ultraviolet and the soft X-ray spectrum. Its magnetic characterization was done using two techniques: Hall probes, for local field measurements, and rotating coil, operating in a way similar to flip-coil, to determine the integrated multipoles. Final results for the phase errors as well as the procedures used to correct the integrated multipoles are presented.

TUPMN005	Optimizing Beam Brightness at the Canadian Light Source	brightness, emittance, coupling, dipole	920
	L. O. Dallin D. Bodnarchuk, T. Summers CLS, Saskatoon, Saskatchewan
	The Canadian Light Source (CLS) storage ring has been operating routinely since commissioning was completed in the spring of 2004. Since that time the storage ring parameters have been adjusted in efforts to increase the brightness of the source. This includes changes to the operating point, reducing the transverse coupling and optimizing the dispersion at the source points. Depending on the photon energy brightness from undulators is increased by reducing the beam size or reducing the emittance. This is achieved with higher tunes which both decrease the emittance and beta-functions. Dispersion at the undulators can be optimized to minimize the effective beam emittance or beam size. Vertical coupling can be adjusted to less than 0.1% by both reducing the vertical dispersion and transverse coupling from the horizontal motion.

TUPMN006	Apple-II and TESLA FEL Undulators at Danfysik A/S	insertion-device, insertion, electron, multipole	923
	C. W.O. Ostenfeld F. Bødker, M. Bøttcher, H. Bach, E. B. Christensen, M. Pedersen Danfysik A/S, Jyllinge
	Danfysik A/S* has recently designed and produced a high-performance Apple-II type insertion device for the Australian Synchrotron Project, with low variation of the first integrals versus gap and phase, and minimal phase error. Thanks to software assistance, and an unconventional keeper design, the total time spent on magnet mounting, shimming and final magnetic testing was reduced to 5 weeks. Furthermore, in order to negate the second-order tune effect of the insertion device on the dynamic aperture, ESRF-type tune shims were designed and installed. Danfysik is manufacturing and assembling one of three undulator prototypes for the TESLA FEL project at DESY. The prototype is based on a design made by DESY, but with changes implemented by Danfysik. A major part of the project is to make an industrial study that will recommend where design efforts on the next prototype generation shall be focused. * http://www.danfysik.com/

TUPMN008	Commissioning of the First Insertion Devices at SOLEIL	storage-ring, 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	insertion-device, insertion, electron, storage-ring	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.

TUPMN013	Dynamic Multipole Shimming of the APPLE Undulator UE112	multipole, simulation, permanent-magnet, dynamic-aperture	941
	J. Bahrdt W. Frentrup, A. Gaupp, M. Scheer, G. Wuestefeld BESSY GmbH, Berlin
	The dynamic off axis field integrals of the BESSY UE112 are of the order of 3 Tmm. They reduce the dynamic aperture significantly which is not tolerable for top-up operation. The dynamic multipoles have successfully been shimmed for the elliptical mode using distributed Fe-shims. In the inclined mode the multipoles are minimized actively with rotatable permanent magnets which are adjusted dependent on gap and phase position. The dynamic properties of the unshimmed and the shimmed device have been simulated using an analytic model for the field description and a generating function algorithm for tracking.

TUPMN016	Upgrade of the BESSY Femtoslicing Source	laser, photon, background, electron	950
	T. Quast A. Firsov, K. Holldack BESSY GmbH, Berlin S. Khan Uni HH, Hamburg R. Mitzner Universität Muenster, Physikalisches Institut, Muenster
	The BESSY femtoslicing source as the first undulator-based source has succesfully demonstrated its capabilities of providing ~100 fs x-ray pulses in an energy range from 300 to 1400 eV with linear and circular polarisation. With this type of slicing source exhibiting an excellent signal-to-noise ratio, the number of detected photons at the user frontend is still limited to ~10³ / sec. Several improvements are underway to increase the photon flux and to improve the stability of the source. An upgrade of the present laser system will increase the pulse repetition rate from 1 to 3 kHz. Furthermore, a new evacuated laser beam path will be implemented to provide higher pointing stability and an automated postion feedback. The benefits and limitations of these improvements will be discussed, and new measurements will be presented.

TUPMN018	Dark Current Transport in the FLASH Linac	gun, linac, simulation, electron	956
	L. Froehlich
	The free electron laser facility FLASH at DESY Hamburg operates a low-emittance photoinjector and several acceleration modules with superconducting cavities to produce a high quality electron beam of up to 700 MeV. Since few months, the accelerator is routinely operated with its design RF pulse length of 800 μs instead of the prior length of 70-200 μs. As a result, the activation of components due to dark current emitted by the gun has reached critical proportions. To improve the understanding of dark current transport through the linac, simulations have been conducted with the Astra tracking code. The generated phase space distributions are compared against a detailed 3-dimensional aperture model of the machine with the newly developed ApertureLib toolkit. The results are in agreement with direct measurements of the dark current and with the observed activities.

TUPMN023	Status of the Optical Replica Synthesizer at FLASH	laser, electron, radiation, dipole	965
	S. Khan G. Angelova, V. G. Ziemann UU/ISV, Uppsala J. Boedewadt, A. Winter Uni HH, Hamburg M. Hamberg, N. X. Javahiraly, M. Larsson, P. Salen, P. van der Meulen FYSIKUM, AlbaNova, Stockholm University, Stockholm A. Meseck BESSY GmbH, Berlin E. Saldin, H. Schlarb, B. Schmidt, E. Schneidmiller, M. V. Yurkov DESY, Hamburg
	A novel laser-based method to measure the longitudinal profile of ultrashort electron bunches, known as Optical Replica Synthesizer, will be implemented at the free-electron laser FLASH at DESY. The paper describes its technical layout and the status of the project. E. Saldin, E. Schneidmiller, M. Yurkov, NIM A 539 (2005), 499

TUPMN024	Measurements of the Beam Heat Load in the Cold Bore Superconductive Undulator Installed at ANKA	electron, vacuum, synchrotron, radiation	968
	S. Casalbuoni T. Baumbach, A. Bernhard, D. Wollmann University of Karlsruhe, Karlsruhe A. W. Grau, M. Hagelstein, B. K. Kostka, R. Rossmanith FZK, Karlsruhe E. Mashkina, E. Steffens University of Erlangen-Nurnberg, Physikalisches Institut II, Erlangen F. Zimmermann CERN, Geneva
	The beam heat load in the cold bore superconductive undulator installed at ANKA has been monitored for almost two years. The possible sources of the observed heat load as synchrotron radiation from upstream magnets, image currents, photo-excited electrons and ions will be discussed and compared with the experimental results.

TUPMN029	Linac Upgrading Program for the Fermi Project : Status and Perspectives	linac, laser, electron, controls	977
	G. D'Auria D. Bacescu, L. Badano, C. Bontoiu, F. Cianciosi, P. Craievich, M. B. Danailov, S. Di Mitri, M. Ferianis, G. C. Pappas, G. Penco, A. Rohlev, A. Rubino, L. Rumiz, S. Spampinati, M. Trovo, A. Turchet, D. Wang ELETTRA, Basovizza, Trieste
	FERMI@ELETTRA is a soft X-ray forth generation light source under development at the ELETTRA laboratory. It will be based on the existing 1.0 GeV Linac, revised and upgraded to fulfil the stringent requirements expected from the machine. The overall time schedule of the project is very tight and ambitious, foreseeing to supply 10 nm photons to users within 2010. Here the machine upgrading program and the ongoing activities are presented and discussed.

TUPMN030	Development of the Mechanical Structure for FERMI@elettra APPLE II Undulators	polarization, insertion-device	980
	D. La Civita L. Bregant, C. Poloni Units, Trieste B. Diviacco, C. Knapic, M. Musardo, D. Zangrando ELETTRA, Basovizza, Trieste
	A conceptual design study of the mechanical structure for the APPLE II undulators of the FERMI@elettra project has been carried using FEM structural analysis program and multiobject optimization software. In this paper the undulator performance, taking into account the predicted mechanical deformations due to the varying magnetic forces, will be evaluated and the resulting magnetic field and optical phase error discussed.

TUPMN035	Generation of a Multipulse Comb Beam and a Relative Twin Pulse FEL	electron, radiation, simulation, emittance	989
	M. Boscolo I. Boscolo, S. Cialdi, V. Petrillo INFN-Milano, Milano F. Castelli Universita degli Studi di Milano, Milano M. Ferrario, C. Vaccarezza INFN/LNF, Frascati (Roma)
	A radiofrequency electron gun joined to a compressor generates trains of THz subpicosecond electron pulses. Assuming a prompt electron emission, the laser train generates a train of electron disks at the cathode, then the disk train evolves towards a slug with a slight density modulation but also with a peculiar sawtooth energy modulation. This kind of energy modulation is transformed into a density modulation by a velocity bunching compressor recovering at a good extent the initial intensity beam profile. We study here through simulations the process looking to its characteristics as function peak and frequency characteristics of the laser and the parameters of the accelerator.

TUPMN039	Status of the SPARC-X Project	emittance, radiation, linac, brightness	1001
	C. Vaccarezza D. Alesini, M. Bellaveglia, S. Bertolucci, R. Boni, M. Boscolo, M. Castellano, A. Clozza, L. Cultrera, G. Di Pirro, A. Drago, A. Esposito, M. Ferrario, L. Ficcadenti, D. Filippetto, V. Fusco, A. Gallo, G. Gatti, A. Ghigo, C. Ligi, M. Migliorati, A. Mostacci, E. Pace, L. Palumbo, L. Pellegrino, M. A. Preger, R. Ricci, C. Sanelli, M. Serio, F. Sgamma, B. Spataro, A. Stella, F. Tazzioli, M. Vescovi, C. Vicario INFN/LNF, Frascati (Roma) F. Alessandria, A. Bacci, R. Bonifacio, I. Boscolo, F. Broggi, F. Castelli, S. Cialdi, C. De Martinis, A. F. Flacco, D. Giove, C. Maroli, V. Petrillo, A. R. Rossi, L. Serafini INFN-Milano, Milano M. Bougeard, P. Breger, B. Carre, D. Garzella, M. Labat, G. Lambert, H. Merdji, P. Monchicourt, P. Salieres, O. Tcherbakoff CEA, Gif-sur-Yvette L. Catani, E. Chiadroni, A. Cianchi, E. Gabrielli, C. Schaerf INFN-Roma II, Roma F. Ciocci, G. Dattoli, A. Dipace, A. Doria, F. Flora, G. P. Gallerano, L. Giannessi, E. Giovenale, G. Messina, P. L. Ottaviani, S. Pagnutti, G. Parisi, L. Picardi, M. Quattromini, A. Renieri, G. Ronci, C. Ronsivalle, M. Rosetti, E. Sabia, M. Sassi, A. Torre, A. Zucchini ENEA C. R. Frascati, Frascati (Roma) M.-E. Couprie SOLEIL, Gif-sur-Yvette P. Emma SLAC, Menlo Park, California M. Mattioli, D. Pelliccia Universita di Roma I La Sapienza, Roma P. Musumeci, M. Petrarca INFN-Roma, Roma C. Pellegrini, S. Reiche, J. B. Rosenzweig UCLA, Los Angeles, California A. Perrone INFN-Lecce, Lecce
	SPARC-X is a two branch project consisting in the SPARC test facility dedicated to the development and test of critical subsystems such as high brightness photoinjector and a modular expandable undulator for SASE-FEL experiments at 500 nm with seeding, and the SPARX facility aiming at generation of high brightness coherent radiation in the 3-13 nm range, based on the achieved expertise. The projects are supported by MIUR (Research Department of Italian Government) and Regione Lazio. SPARC has completed the commissioning phase of the photoinjector in November 2006. The achieved experimental results are here summarized together with the status of the second phase commissioning plans. The SPARX project is based on the generation of ultrahigh peak brightness electron beams at the energy of 1 and 2 GeV generating radiation in the 3-13 nm range. The construction is at the moment planned in two steps starting with a 1 GeV Linac. The project layout including both RF-compression and magnetic chicane techniques has been studied and compared, together with the feasibility of a mixed s-band and x-band linac option.

TUPMN045	PF-Ring and PF-AR Operational Status	injection, insertion, insertion-device, photon	1019
	Y. Kobayashi S. Asaoka, W. X. Cheng, K. Haga, K. Harada, T. Honda, T. Ieiri, S. Isagawa, M. Izawa, T. Kageyama, T. Kasuga, M. Kikuchi, K. Kudo, H. Maezawa, A. Mishina, T. Mitsuhashi, T. Miyajima, H. Miyauchi, S. Nagahashi, T. T. Nakamura, H. Nakanishi, T. Nogami, T. Obina, K. Oide, M. Ono, T. Ozaki, C. O. Pak, H. Sakai, Y. Sakamoto, S. Sakanaka, H. Sasaki, Y. Sato, T. Shioya, M. Tadano, T. Takahashi, S. Takasaki, Y. Tanimoto, M. Tejima, K. Tsuchiya, T. Uchiyama, A. Ueda, K. Umemori, S. Yamamoto, Ma. Yoshida, S. I. Yoshimoto KEK, Ibaraki
	In KEK, we have two synchrotron light sources which were constructed in the early 1980s. One is the Photon Factory storage ring (PF-ring) and the other is the Photon Factory advanced ring (PF-AR). The PF-ring is usually operated at 2.5 GeV and sometimes ramped up to 3.0 GeV to provide photons with the energy from VUV to hard X-ray region. The PF-AR is mostly operated in a single-bunch mode of 6.5 GeV to provide pulsed hard X-rays. Operational performances of them have been upgraded through several reinforcements. After the reconstruction of the PF-ring straight sections from March to September 2005, two short-gap undulators were newly installed. They allow us to produce higher brilliant hard X-rays even at the energy of 2.5 GeV. At present we are going to prepare a top-up operation for the PF-ring. In the PF-AR, new tandem undulators have been operated in one straight section since September 2006 to generate much stronger pulsed hard X-rays for the sub-ns resolved X-ray diffraction experiments. In this conference, we report operational status of the PF-ring and the PF-AR including other machine developments.

TUPMN047	W-band Electromagnetic Wave Undulator for AIST 800 MeV Electron Storage Ring TERAS	electron, photon, storage-ring, 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, radiation, storage-ring	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.

TUPMN057	Design and Tuning of NSRL Undulator UD-1	radiation, sextupole, multipole, quadrupole	1055
	Q. K. Jia
	The design, construction, and tuning of the first undulator UD-1 in NSRL are described. The magnetic field design and requirement are given. The results of the magnet blocks measurement and the magnetic field tuning by interchanging magnet blocks are presented.

TUPMN070	Magnet Block Arrangements for the Apple-II Elliptically Polarized Undulator	polarization, multipole, photon, storage-ring	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.

TUPMN071	Planning of Insertion Devices for 3 GeV Taiwan Photon Source	photon, insertion, insertion-device, wiggler	1082
	C.-S. Hwang
	The Taiwan Photon Source (TPS) has 24 straight sections (10.9 m x6,5.7 m x18). It has at least three long straight and 18 medium straight for installing insertion devices. Most of the insertion devices are the in-vacuum undulator and produce intense X-rays with a brilliance of up to 1x10²⁰ photons/s/mr²/mm²/0.1%bw. However, the cryogenic permanent magnet undulator with a periodic length of 1.8 cm (CU1.8) will be developed to provide an energy over 20 keV. One or two types of undulators can be installed in the long straight section to provide low photon energy or enable experiments to be conducted in situ in a single beam line. Meanwhile, some elliptically polarized undulators (APPLE II structure) are planned to provide circular and any linear polarization light. One or two superconducting wigglers with a field strength of 3.5 T will be used to yield the photons with energies of over 25 keV. A study project of superconducting undulator is for the energies of 2.5 - 25 keV. This work will report the design philosophy for the insertion devices and what kinds of insertion devices will be operated at TPS.

TUPMN088	Commissioning and Investigation of Beam Dynamics of Phase I Insertion Devices at Diamond	injection, optics, quadrupole, wiggler	1118
	B. Singh R. Bartolini, R. T. Fielder, E. C. Longhi, I. P.S. Martin Diamond, Oxfordshire
	Diamond is a 3 GeV low emittance third generation light source recently commissioned in Oxfordshire, UK. During Phase I of the project, seven insertion devices (IDs) have been installed and commissioned: these include 5 in-vacuum permanent magnet undulators, a variable polarization APPLE-II helical device and a superconducting wiggler. We present our experiences commissioning these devices and the results of the investigations of their effects on beam dynamics, including orbit distortion, linear tune shifts, beta-beating and beam lifetime. Alpha-matching with local and global tune compensations, as well as the LOCO algorithm, have been used to compensate the linear optic perturbations. The results are discussed and compared with theoretical predictions. Injection with IDs in operation has also been investigated in view of future top-up operation.

TUPMN089	Configuration, Optics, and Performance of a 7-GeV Energy Recovery Linac Upgrade for the Advanced Photon Source	emittance, linac, storage-ring, 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.

TUPMN092	Phasing of Two Undulators with Different K Values at the Advanced Photon Source	brilliance, photon, coupling, emittance	1130
	R. J. Dejus I. Vasserman 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. Two full-length 2.4-m-long undulators, with period lengths 2.3 cm and 2.7 cm, were recently installed in tandem in the 5.6-m-long straight on the storage ring in sector 14. One part of the user research program requires that both undulators be tuned to 12.0 keV and the x-ray intensity maximized. The total intensity is sensitive to the phasing between the undulators, so the distance between the devices must be optimized and the ends tuned appropriately. Because of the different period lengths, the gaps and K values of the undulators will be different: 10.6-mm gap and a K value of 1.17 for the shorter-period device and 15.7-mm gap and a K value of 0.93 for the longer-period device. A special shield was designed and installed between the devices to eliminate interference. Results of magnetic measurements, tuning, and computer simulations of the spectral performance are presented.

TUPMN094	Development of a Model Superconducting Helical Undulator for the ILC Positron Source	positron, linear-collider, collider, target	1136
	S. H. Kim C. Doose 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. Model superconducting helical undulators are under development for the proposed International Linear Collider (ILC) positron source. The undulator requires high-permeability steel poles and superconducting coils to meet the ILC parameters. A fabrication method for steel poles on a nonmagnetic beam chamber was developed. A model undulator with a period length of 14 mm and Nb3Sn coils was fabricated. Both ends of the model were designed to provide for continuous winding of a single conductor with 39 turns per helix. A 10-mm-period model was designed and is in the fabrication process. The 14-mm-period model may be used in the development of a cryogenic magnetic measurement system. Details of the fabrication and test results will be presented.

TUPMN097	A Possibility for Using an APPLE Undulator to Generate a Photon Beam with Transverse Optical Modes	radiation, polarization, optics, synchrotron	1142
	S. Sasaki I. McNulty ANL, Argonne, Illinois T. Shimada JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken
	Funding: Work supported by the U. S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract DE-AC02-06CH11357. Photons that carry orbital angular momentum are of great interest to the optics and laser communities. This exotic property of photon beams was recently demonstrated in the x-ray regime* and may be useful to probe angular momentum in matter**. However, by comparison to the visible light regime, it is difficult to fabricate efficient achromatic optics to generate these optical modes in x-rays. In spite of these inconveniences, there has been no investigation of the possibility of using a synchrotron light source to directly generate an x-ray beam with transverse optical modes. In this paper, we investigate use of an APPLE-type undulator for generating Laguerre-Gaussian (LG) and Hermite-Gaussian (HG) mode beams. We find that the second harmonic radiation in the circular mode corresponds to an LG beam with l=1, and the second harmonic in the linear mode corresponds to an HG beam with l=1. The combination of an APPLE undulator and conventional monochromator optics may provide an opportunity for a new type of experimental research in the synchrotron radiation community. Detailed discussion will be presented in the conference. We thank C. Quitmann for insightful comments. M. Padgett, J. Courtial, L. Allen, Physics Today, p. 35, May, 2004. A. G. Peele et al., Optics Letters, 27, 1752 (2002).* M. VanVeenendaal and I. McNulty, Phys. Rev. Lett., submitted.

TUPMN100	LCLS Undulator Production	factory, linac, extraction, photon	1148
	E. Trakhtenberg T. Barsz, P. K. Den Hartog, G. S. Lawrence, E. R. Moog, S. Sasaki, I. Vasserman, M. White ANL, Argonne, Illinois T. Becker, S. Dufresne, W. Kummerle, R. Schuermann Metalex Manufacturing, Cincinnati, Ohio G. Goldfarb, N. Lagonsky, S. Lagonsky, S. Sorsher Hi-Tech Manufacturing, Schiller Park, Illinois
	Funding: Work supported by the U. S. Dept. of Energy, under contract numbers DE-AC02-06CH11357 and DE AC03-76SF00515. Design and construction of the undulators for the Linac Coherent Light Source (LCLS) is the responsibility of Argonne National Laboratory. A prototype undulator* was constructed in-house and was extensively tested. The device was tunable to well within the LCLS requirements and was stable over a period of several years. Experience constructing the prototype undulator led us to conclude that with appropriate engineering design and detailed assembly procedures, precision undulators can be constructed by qualified vendors without previous undulator-construction experience. Our detailed technological knowledge and experience were transferred to the successful bidders who have produced outstanding undulators. Our production concept for the 40 3.4 m long, fixed-gap, planar-hybrid undulators with a 30 mm period is presented. Manufacturing, quality assurance, and acceptance testing details are also presented. *LCLS Prototype Undulator Report, Argonne National Laboratory Report ANL/APS/TB-48, January 2004, R. Dejus, Editor.

TUPMN101	A Study of the Minimum Wall Thickness for an Extruded Aluminum Vacuum Chamber	vacuum, insertion, insertion-device, synchrotron	1151
	E. Trakhtenberg G. E. Wiemerslage ANL, Argonne, Illinois
	Funding: Work at Argonne National Laboratory is supported by the U. S. Department of Energy, Office of Science, Office of Basic Energy Sciences under contract # DE-Ac02-06CH11357. Multiple vacuum chambers for the insertion devices with 1-mm wall thickness were developed at Argonne for the APS and many other synchrotron radiation facilities.* Using the extrusion for the insertion device vacuum chamber (ID VC) for the DESY FEL project with a 9.5-mm inner diameter, we decreased the wall thickness to 0.6, 0.5, and 0.4 mm to test the vacuum integrity for a thin wall in these extrusions. A special ultrasonic transducer with a 1/8" diameter was required to do the job. Also some additional short samples, machined exactly as the experimental piece, were used to verify wall thickness mechanically. Experimental setup and test results are presented. * Trakhtenberg E., Wiemerslage G., Den Hartog P. "New insertion device vacuum chambers at the Advanced Photon Source", PAC 2003 Particle Accelerator Physics Conference; Portland, OR.

TUPMN104	A Design Study for Photon Diagnostics for the APS Storage Ring Short-Pulse X-ray Source	electron, diagnostics, photon, laser	1156
	B. X. Yang E. M. Dufresne, E. C. Landahl, A. H. Lumpkin 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 short x-ray pulse source based on the crab cavity scheme proposed by Zholents* is being developed at the Advanced Photon Source (APS). Photon diagnostics that visualizes the electron bunches with transverse momentum chirp and verifies the performance of the short x-ray pulse is required. We present a design study for the imaging diagnostics inside and outside of the crab cavity zone, utilizing both x-ray and visible synchrotron radiation. Several design options of monochromatic and polychromatic x-ray optics will be explored for their compatibility with the short-pulse source. The diagnostics outside of the crab cavity zone will be used to map out stable operation parameters of the storage ring with crab cavities, and to perform single-bunch single-pass imaging of the chirped bunch, which facilitates the tuning of the crab cavity rf phase and amplitude so the performance of the short pulse source can be optimized while other users around the ring will not be disturbed. * A. Zholents et al., NIM A 425, 385 (1999).

TUPMS002	Successful Completion of the Femtosecond Slicing Upgrade at the ALS	insertion, insertion-device, coupling, laser	1194
	C. Steier P. A. Heimann, S. Marks, D. Robin, R. W. Schoenlein, W. Wan LBNL, Berkeley, California W. Wittmer SLAC, Menlo Park, 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. An upgraded femtosecond slicing facility has been commissioned successfully at the Advanced Light Source. In contrast to the original facility at the ALS which pioneered the concept, the new beamline uses an undulator (the first in-vacuum undulator at the ALS) as the radiator producing the user photon beam. To spatially separate the femtosecond slices in the radiator, a local vertical dispersion bump produced with 12 skew quadrupoles is used. The facility was successfully commissioned during the last 1.5 years and is now used in routine operation.

TUPMS023	Measurement of Permanent Magnet Material Demagnetization Due to Irradiation by High Energy Electrons	radiation, electron, synchrotron, permanent-magnet	1230
	A. Temnykh
	Funding: Work supported by the National Science Foundation under contract PHY 0202078 The design of insertion device depends on the properties of the permanent magnet material used. While magnetic material properties such as coercive force, residual induction and magnetization variation with temperature are provided by manufacturer, demagnetization caused by radiation can be only roughly estimated based on very few published data. To obtain data which can be reliably used in ERL insertion device design, we irradiated two materials of very different coercive forces and measured their demagnetization as function of radiation dose. For irradiation we used 5GeV electron beam from Cornell 12GeV Synchrotron. Radiation dose was measured using the calorimetric technique. One of the materials was similar to what we plan to use in construction of ERL undulators. Detailed information on experimental setup, radiation dose measurement techniques, results and analysis will be presented.

TUPMS026	Design of Control Instrumentation of two In-Vacuum Undulators IVU25s	controls, vacuum, synchrotron, synchrotron-radiation	1236
	J. Kulesza N. Chen SSRF, Shanghai A. Deyhim Advanced Design Consulting, Inc, Lansing, New York
	Funding: Shanghai Institute of Applied Physics This paper summarizes the primary controller that is based on Schneider Premium PLC for two in-vacuum undulators to be installed at SSRF. The PLC controls a single gap stepper motor and driver, both made by Parker-Hannifin. Position feedback is derived from a TR Electronics linear absolute LTS-240 encoder mounted across the gap. The encoder resolution is programmable down to .1 um per count. Since the encoder is absolute there will be no need to home the gap axis. The advantage of linear encoders is the measurement is more direct and is not subject to wind-up and deflection that a rotary encoder would see on the end of a ball screw. Two encoders are planned, one on each end of the magnet array. One encoder will be the primary feedback for the axis and the other will detect deflection errors and girder taper. Four limits are provided as well as 4 kill switches. The 4 switches (2 limits and 2 kills) at min gap are optical and the 4 outer switches (2 limits and 2 kills) are mechanical. The limits prevent further motion in the direction they protect but allow the axis to be driven in the other direction (off the switch).

TUPMS027	Development of Software to Control 8-Motor Elliptically Polarizing Undulators	controls, power-supply, target, insertion	1239
	C. Spackman A. Deyhim Physics Teachers Association, Knoxville, Tennessee E. A. Johnson Advanced Design Consulting, Inc, Lansing, New York J. T. Thånell, E. J. Wallen MAX-lab, Lund
	Funding: Swedish Natural Research Council (Vetenskapsrdet) Advanced Design Consulting developed control software entitled IDcontrol for its state-of-the-art Apple II insertion devices (ID). These IDs feature 8 controllable axes: four servo motors control the gap and taper of two main girders, and four servo motors control the photon polarization-state by manipulating four sub-girders. IDcontrol simultaneously positions all 8 axes with high precision in real-time using 0.1 micron linear encoders attached directly to the girders and sub-girders. Helical and Inclined Plane phase modes are supported with automated mode switching. Magnetic-field-correction-coil current and girder taper are adjustable as functions of gap, phase, and phase mode. IDcontrol continuously monitors redundant encoder velocity and position data for maximal reliability, encoder failure detection, and damage prevention. Combined with ADCs Graphical User Interface (GUI) entitled IDgui, IDcontrol manipulates the ID, provides user notification and automated recovery from errors, management of correction data, and isometric visualization of the ID's girders. The functionality of both IDcontrol and IDgui has been demonstrated at MAX lab and the results will be discussed.

TUPMS034	Seeded VISA: A 1064 nm Laser-Seeded FEL Amplifier at the BNL ATF	electron, radiation, laser, simulation	1257
	M. P. Dunning G. Andonian, E. Hemsing, S. Reiche, J. B. Rosenzweig UCLA, Los Angeles, California M. Babzien, V. Yakimenko BNL, Upton, Long Island, New York
	An experimental study of a seeded free electron laser (FEL) using the VISA undulator and a Nd:YAG seed laser will be performed at the Accelerator Test Facility at Brookhaven National Laboratory. The study is motivated by the demand for a short Rayleigh length FEL amplifier at 1 micron for high power transmission with minimal damage of transport optics. Planned measurements include transverse and longitudinal coherence, angular distribution, and wavelength spectrum of the FEL radiation. The effects of detuning the electron beam energy will be studied, with an emphasis on control of the radiation emission angles and increase of the amplifier efficiency. Results of start-to-end simulations will be presented with preliminary experimental results.

TUPMS036	Characterization of Orbital Angular Momentum Modes in FEL Radiation	simulation, coupling, radiation, laser	1263
	E. Hemsing G. Andonian, J. B. Rosenzweig UCLA, Los Angeles, California M. Babzien, V. Yakimenko BNL, Upton, Long Island, New York A. Gover University of Tel-Aviv, Faculty of Engineering, Tel-Aviv
	Optical guiding of the radiation pulse through the source electron bunch in a free-electron laser is a well known phenomena that suppresses diffraction of the output radiation, and thus enhances the gain. The resulting radiation can be described by an expansion of orthogonal modes that are also composed of eigenstates of orbital angular momentum (OAM). In the VISA-FEL experiment at the ATF-BNL, gain guiding has been observed under self-amplified spontaneous emission conditions at 840 nm with a strongly chirped input electron beam. The resulting far-field transverse radiation profiles are observed to contain multiple modes in the angular intensity spectrum, and exhibit both hollow and spiral structures characteristic of single or multiply interfering OAM modes. Current efforts to characterize the transverse radiation profile both experimentally and through start-to-end simulations are presented.

TUPMS038	Recent Upgrade to the Free-electron Laser Code Genesis 1.3	electron, radiation, coupling, simulation	1269
	S. Reiche K. Goldammer BESSY GmbH, Berlin P. Musumeci Rome University La Sapienza, Roma
	The time-dependent code GENESIS 1.3 has be modified to address new problems in modeling Free-electron Lasers. The functionality has been extended to include higher harmonics and to allow for a smoother modeling of cascading FELs. The code has been also exported to a parallel computer architecture for faster execution using the MPI protocol.

TUPMS039	Coherence Properties of the LCLS X-ray Beam	electron, radiation, simulation, emittance	1272
	S. Reiche
	Self-amplifying spontaneous radiation free-electron lasers, such as the LCLS or the European X-FEL, rely on the incoherent, spontaneous radiation as the seed for the amplifying process. Though this method overcomes the need for an external seed source one drawback is the incoherence of the effective seed signal. The FEL process allows for a natural growth of the coherence because the radiation phase information is spread out within the bunch due to slippage and diffraction of the radiation field. However, at short wavelengths this spreading is not sufficient to achieve complete coherence. In this presentation we report on the results of numerical simulations of the LCLS X-ray FEL. From the obtained radiation field distribution the coherence properties are extracted to help to characterize the FEL as a light source.

TUPMS045	Improvements to the Aladdin Synchrotron Light Source	insertion, insertion-device, synchrotron, quadrupole	1290
	K. Jacobs J. Bisognano, R. A. Bosch, D. Eisert, M. V. Fisher, M. A. Green, R. G. Keil, K. J. Kleman, R. A. Legg, G. C. Rogers, J. P. Stott UW-Madison/SRC, Madison, Wisconsin
	Funding: Work supported by the U. S. National Science Foundation under Award No. DMR-0537588. Aladdin is an IR to soft x-ray synchrotron light source operated by the University of Wisconsin at Madison. As part of the ongoing program of upgrades and improvements, several changes have recently been made to the ring. It had previously been determined that physical apertures (BPMs) at the QF quadrupoles were limiting beam lifetime when the ring was operated in its low emittance configuration. Increasing the size of these apertures has resulted in a significant increase in lifetime. Also as part of the aperture opening process, a number of ring components were redesigned and replaced, lowering the ring impedance. This has led to an increase in the threshold beam current for microwave instability. Another modification was the design and installation of discrete trim coils on the quadrupole pole-tips to facilitate using the quads as steering correctors. Details of these and other improvements will be presented.

TUPMS057	An Efficient 95-GHz, RF-Coupled Antenna	radiation, electron, impedance, laser	1314
	J. E. Spencer Y. A. Hussein SLAC, Menlo Park, California
	Funding: Work supported by U. S. Dept. of Energy contract DE-AC02-76SF00515. This paper presents an efficient, RF-coupled, 95-GHz undulatory (snake-like) antenna that can be fabricated using IC technology. While there are many uses for directed power at this frequency our interest is in understanding the propagation of the input power through the circuit and its radiative characteristics for comparison to earlier work in the THz range (see PAC05). 95 GHz was chosen because test equipment was available (WR-10 waveguide and HP network analyzer). Different materials, heights and widths of the circuit were considered on a low-loss, 0.10-mm thick quartz substrate e.g. 0.75 microns of elevated gold corresponding to three skin depths. The design is compared to more conventional RF technology using a low energy, high power electron beam and to higher energy, lower power Smith Purcell gratings and free-electron-lasers (FELs). The FDTD results show narrow-band, 80% radiation efficiency with a dipole-like radiation pattern that is enhanced by adding periods. The radiated power was calculated using two different techniques that agreed quite well i.e. by integrating the far-field Poynting vector as well as subtracting the output power from input power.

TUPMS059	LCLS Undulator Tuning And Fiducialization	alignment, electron, linac, free-electron-laser	1320
	Z. R. Wolf V. Kaplounenko, Yu. I. Levashov, A. W. Weidemann SLAC, Menlo Park, California
	Funding: Work supported in part by the DOE Contract DE-AC02-76SF00515. The LCLS x-ray free electron laser project at SLAC requires 40 undulators: 33 in the beamline, 6 spares, and one reference undulator. A new facility was constructed at SLAC for tuning and fiducializing the undulators. The throughput of the facility must be approximately one undulator per week. Much effort has gone into automating the undulator tuning. Because of tight alignment tolerances, accurate techniques were developed to fiducialize the undulators. The new facility, the tuning techniques, and the fiducialization techniques will be discussed.

TUPMS065	JLAMP: An Amplifier Based FEL in the JLab SRF ERL Driver	wiggler, injection, emittance, electron	1329
	K. Jordan S. V. Benson, D. Douglas, P. Evtushenko, C. Hernandez-Garcia, G. Neil Jefferson Lab, Newport News, Virginia
	Funding: This work supported by the Off. of Naval Research, the Joint Technology Off., the Commonwealth of Virginia, the Air Force Research Lab, Army Night Vision Lab, and by DOE Contract DE-AC05-060R23177. Notional designs for ERL-driven high average power free electron lasers often invoke amplifier-based architectures. To date, however, amplifier FELs have been limited in average power output to values several orders of magnitude lower than those demonstrated in optical-resonator based systems; this is due at least in part to the limited electron beam powers available from their driver accelerators. In order to directly contrast the performance available from amplifiers to that provided by high-power cavity-based resonators, we have developed a scheme to test an amplifier FEL in the JLab SRF ERL driver. We describe an accelerator system design that can seamlessly and non-invasively integrate a 10 m wiggler into the existing system and which provides, at least in principle, performance that would support high-efficiency lasing in an amplifier configuration. Details of the design and an accelerator performance analysis will be presented.

TUPMS069	Proposed Tabletop Laser-driven Coherent X-Ray Source	laser, electron, vacuum, polarization	1332
	T. Plettner R. L. Byer Stanford University, Stanford, Califormia
	Laser-driven particle acceleration shows promise for compact ultra-low emittance, GeV/m electron sources. The first proof-of-principle demonstration for this particle acceleration technique has been carried out and a comprehensive experimental program to develop dielectric based micro-accelerator structures is under way. Therefore it is natural to explore the possibility for applying these future accelerators for SASE-FEL based X-ray generation. We employ well-established numerical models based on the standard SASE-FEL theory to find a plausible set of undulator and electron beam parameters to accomplish the desired X-ray pulse structure.

TUPMS086	Insertion Device R&D for NSLS-II	insertion, insertion-device, wiggler, emittance	1368
	T. Tanabe D. A. Harder, G. Rakowsky, T. V. Shaftan, J. Skaritka BNL, Upton, Long Island, New York
	NSLS-II is a medium energy storage ring of 3GeV electron beam energy with sub-nm.rad horizontal emittance and top-off capability at 500mA. Damping wigglers will be used not only to reduce the beam emittance but also for broadband sources for users. Cryo-Permanent Magnet Undulators (CPMUs) are considered for hard X-ray linear device, and permanent magnet based Elliptically Polarized Undulators(EPUs) are for polarization control. Rigorous R&D plans have been established to pursue the performance enhancement of the above devices as well as building new types of insertion devices such as high temperature superconducting wiggler/undulators. This paper describes the details of these activities and discuss technical issues.

TUPMS088	Efficiency Enhancement Experiment with a Tapered Undulator in a Single-pass Seeded FEL at the NSLS SDL	electron, simulation, laser, radiation	1371
	T. Watanabe D. A. Harder, R. K. Li, J. B. Murphy, G. Rakowsky, Y. Shen, X. J. Wang BNL, Upton, Long Island, New York
	Funding: This work is supported by the Office of Naval Research under contract No. N0002405MP70325 and U. S. Department of Energy under contract No. DE-AC02-98CH1-886. We report the experimental characterization of the FEL efficiency enhancement using a tapered undulator in a single-pass seeded FEL amplifier at the NSLS SDL. The last 3 m of the 10 m NISUS undulator was linearly tapered so that the magnetic field strength at the end of the undulator was reduced by 5 %. The FEL energy gain along the undulator was measured for both the tapered and un-tapered undulator. The FEL energy with the taper was measured to be about 3.2 times higher than that without the taper. We also experimentally characterized the spectrum and the transverse distribution of the FEL light for both the tapered and un-tapered undulator. The experimental results are compared with the numerical simulation code, GENESIS 1.3.

TUPAN083	Space-Charge Neutralization in Ion Undulator Linear Accelerator	ion, simulation, acceleration, linac	1565
	E. S. Masunov S. M. Polozov MEPhI, Moscow
	RF undulator accelerator (UNDULAC-RF) is suggested as an initial part of high intensity ion linac. Such accelerator can be realized in periodical IH structure where a field has no spatial harmonics in synchronism with the beam. Ion beam is accelerated by the combined field of two non-synchronous harmonics. Accelerating force value is proportional to squared particle charge. Transmission coefficient and accelerating gradient for low velocity ions with the identical sign of charge are the same as in RFQ. The limit beam current can be larger in this type accelerator. Its value was calculated earlier in paper . But the beam intensity can be substantially increased in UNDULAC by using space charge neutralization of positive and negative charged ions. In UNDULAC positive and negative ions can be accelerated simultaneously within the same bunch. The process of acceleration and focusing of oppositely charged ions with the identical charge-to-mass ratio is discussed in this paper. E. S. Masunov, Technical Physics, V. 46, 11, 2001, pp. 1433-1436.**E. S. Masunov, S. M. Polozov, NIM., A 558, 2006, pp. 184-187.

WEXKI02	Demonstration of Optical Microbunching and Net Acceleration at 0.8 microns	laser, acceleration, electron, simulation	1894
	C. M.S. Sears R. L. Byer, T. Plettner Stanford University, Stanford, Califormia E. R. Colby, R. Ischebeck, C. Mcguinness, R. Siemann, J. E. Spencer, D. R. Walz SLAC, Menlo Park, California
	Formation, diagnosis, and acceleration of electron microbunches from an rf linac generated beam is presented. A PM-EM hybrid IFEL/chicane buncher was designed and commissioned to produce optical bunch trains suitable for injection into solid-state laser accelerators. Microbunching is independently diagnosed via coherent optical tranisition radiation (COTR). Net acceleration is obtained by splitting the laser power between the IFEL and an inverse transition radiation (ITR) accelerator.
	Slides

WEOAKI01	Optical Stochastic Cooling Proof-of-Principle Experiment	electron, radiation, damping, scattering	1904
	W. A. Franklin
	Cooling of charged particle beams plays a key role in achieving peak luminosity in high-energy colliders. The presently undemonstrated technique of optical stochastic cooling (OSC)* holds promise for fast cooling of high energy protons and heavy ions. A proof-of-principle experiment with electrons is proposed at relatively modest cost using the MIT-Bates South Hall Ring, which is well suited for such a test due to its energy range, layout, and RF system, as well as its present availability. An overview of the experiment will be presented. The design of key systems for the achievement of OSC will be disucussed along with beam requirements and cooling projections. *M. Zolotorev and A. Zholents, Phys Rev. E 50 (1994) 3087.
	Slides

WEZAB01	ILC Undulator Based Positron Source, Tests and Simulations	positron, target, electron, polarization	1974
	A. A. Mikhailichenko
	Funding: NSF An undulator based positron source allows generation of polarized positrons in quantities required by ILC. Here we describe the results of modeling and testing of elements for such a system.
	Slides

WEPMN012	Beam Loading Compensation Using Real Time Bunch Charge Information from a Toroid Monitor at FLASH	controls, beam-loading, klystron, gun	2074
	E. Vogel C. Gerth, W. Koprek, F. Loehl, D. Noelle, H. Schlarb, T. Traber DESY, Hamburg
	Funding: Deutsches Elektronen-Synchrotron - DESY At pulsed linear accelerators, fast proportional rf control compensates beam loading sufficiently for single or a few bunches. In the case of long bunch trains, additional measures have to be taken commonly by adding a compensation signal to the rf drive signals calculated from the predicted beam intensity. In contrast to predictive methods, techniques based on real time beam measurements are sensitive to fast changes of the beam intensity and bunch patterns. At FLASH we apply a beam loading compensation scheme based on toroid monitor signals. This paper presents the compensation scheme, the calibration procedure and the effect on the beam.

THPMN037	Development of Compact EUV Source based on Laser Compton Scattering	laser, electron, scattering, radiation	2799
	S. Kashiwagi R. Kato, J. Yang ISIR, Osaka R. Kuroda AIST, Tsukuba, Ibaraki K. Sakaue, M. Washio RISE, Tokyo J. Urakawa KEK, Ibaraki
	High-power extreme ultraviolet (EUV) source is required for next generation semiconductor lithography. We start to develop a compact EUV source in the spectral range of 13-14 nm, which is based on laser Compton scattering between a 7 MeV electron beam and a high intensity CO2 laser pulse. Electron beam is pre-bunched using two different wavelengths of laser pulses with a dispersion section of beam transport line,. In this conference, we describe the results of numerical study for the EUV source and a plan of test experiment generating micro-bunched electron beam. M. Goldstein et al., Proc. of the 27th Int. FEL conference, Stanford, California, USA (2005) pp.422-425**A. Endo, Sematic EUV source workshop, Barcelona, Spain (2006)

THPMN070	Development of a Full Scale Superconducting Undulator Module for the ILC Positron Source	positron, vacuum, radiation, linear-collider	2862
	Y. Ivanyushenkov I. R. Bailey, J. A. Clarke, J. B. Dainton, O. B. Malyshev, L. I. Malysheva, G. A. Moortgat-Pick, D. J. Scott Cockcroft Institute, Warrington, Cheshire D. P. Barber DESY, Hamburg E. Baynham, T. W. Bradshaw, A. J. Brummitt, F. S. Carr, A. J. Lintern, J. Rochford STFC/RAL, Chilton, Didcot, Oxon P. Cooke Liverpool University, Science Faculty, Liverpool B. J.A. Shepherd STFC/DL/ASTeC, Daresbury, Warrington, Cheshire
	Funding: This work is supported in part by the Commission of the European Communities under the 6th Framework Programme "Structuring the European Research Area", contract number RIDS-011899. An undulator based positron source is a baseline for the International Linear Collider (ILC). The HeliCal collaboration in the UK is working on the development of a full scale 4-m long undulator module. Several prototypes have been built and tested in the R&D phase of the programme that culminated in the development of manufacturing techniques suitable for construction of the first full scale undulator sections. This paper details the design and the construction status of 4-m long undulator module.

THPMN071	Status of R&D on a Superconducting Helical Undulator for the ILC Positron Source	positron, vacuum, linear-collider, collider	2865
	Y. Ivanyushenkov I. R. Bailey, J. A. Clarke, J. B. Dainton, O. B. Malyshev, L. I. Malysheva, G. A. Moortgat-Pick, D. J. Scott Cockcroft Institute, Warrington, Cheshire D. P. Barber DESY, Hamburg E. Baynham, T. W. Bradshaw, A. J. Brummitt, F. S. Carr, A. J. Lintern, J. Rochford STFC/RAL, Chilton, Didcot, Oxon P. Cooke Liverpool University, Science Faculty, Liverpool B. J.A. Shepherd STFC/DL/ASTeC, Daresbury, Warrington, Cheshire
	Funding: This work is supported in part by the Commission of the European Communities under the 6th Framework Programme "Structuring the European Research Area", contract number RIDS-011899. An undulator based positron source is a baseline for the International Linear Collider (ILC). The HeliCal collaboration in the UK is carrying out an R&D programme on a short period supercoducting helical undulator with the goal to develop manufacturing technique as well as modelling and measurement techniques. Several undulator prototypes have been built and successfully tested. This paper summarizes the results of the R&D phase of the project.

THPMN074	The Status of the HeLiCal Contribution to the Polarised Positron Source for the International Linear Collider	positron, simulation, electron, damping	2874
	D. J. Scott I. R. Bailey, D. P. Barber, J. B. Dainton, L. J. Jenner Cockcroft Institute, Warrington, Cheshire E. Baynham, T. W. Bradshaw, A. J. Brummitt, F. S. Carr, Y. Ivanyushenkov, A. J. Lintern, J. Rochford STFC/RAL, Chilton, Didcot, Oxon A. Birch, J. A. Clarke, O. B. Malyshev STFC/DL/ASTeC, Daresbury, Warrington, Cheshire L. I. Malysheva Liverpool University, Science Faculty, Liverpool G. A. Moortgat-Pick Durham University, Durham
	The positron source for the International Linear Collider is a helical undulator-based design, which can generate unprecedented quantities of polarised positrons. The HeLiCal collaboration takes responsibility for the design and prototyping of the superconducting helical undulator, which is a highly demanding short period device with very small aperture, and also leads the start to end simulations of the polarised electrons and positrons to ensure that the high polarisation levels generated survive from the source up to the collision point. This paper will provide an update on the work of the collaboration, focusing on these two topic areas, and will also discuss future plans.

THPMN090	Systematic Study of Undulator Based ILC Positron Source: Production and Capture	positron, target, photon, polarization	2918
	W. Liu W. Gai, K.-J. Kim ANL, Argonne, Illinois
	A systematic study of the positron production and capture systems for the undulator-based ILC positron source has been performed. Various undulator parameters, such as k and λ, were considered. Our model starts from the electron beam production of the polarized photons in the undulator section, photon transport and collimation in the drift section, and photon interaction on the target (titanium or tungsten). Next, our model transports the produced polarized positrons from the target, through the tapered capturing magnet, and through the normal conducting linac to several hundred MeV. Finally, the captured positrons meeting the damping ring emittance and energy spread requirements are accelerated up to 5 GeV using the standard ILC superconducting cavities. We will present parametric studies for the different scenarios (e.g. 60% polarization vs. unpolarized; target immersed in magnetic field vs. non-immersed) currently under consideration and report on the capturing yield and polarizations achieved for each.

THPMS012	Collection Optics for ILC Positron Target	target, positron, electron, optics	3017
	A. A. Mikhailichenko
	Funding: NSF We are considering the implementation of a Lithium lens and SC solenoidal lens for collection of positrons in ILC undulator-based source. Such a lens installed right after the thin target, which is illuminated by gamma quants from helical undulator.

THPMS026	The UCLA Helical Permanent-Magnet Inverse Free Electron Laser	laser, electron, simulation, permanent-magnet	3055
	R. Tikhoplav J. T. Frederico, G. Reed, J. B. Rosenzweig, S. Tochitsky, G. Travish UCLA, Los Angeles, California G. Gatti INFN/LNF, Frascati (Roma)
	The Inverse Free Electron Laser (IFEL) is capable, in principle, of reaching accelerating gradients of up to 1 GV/m making it a prospective accelerator scheme for linear colliders. The Neptune IFEL at UCLA utilizes a 15 MeV Photoinjector-generated electron beam of 0.5 nC and a CO2 laser with peak energy of up to 100 J, and will be able to accelerate electrons to 100 MeV over an 80 cm long, novel helical permanent-magnet undulator. Past IFELs have been limited in their average accelerating gradient due to the Gouy phase shift caused by tight focusing of the drive laser. Here, laser guiding is implemented via an innovative Open Iris-Loaded Waveguide Structure scheme which ensures that the laser mode size and wave front are conserved through the undulator. The results of the first phase of the experiment are discussed in this paper, including the design and construction of a short micro-bunching undulator, testing of the OILS waveguide, as well as the results of corresponding simulations.

THPAN026	Beam Profile Measurements and Analysis at FLASH	emittance, electron, simulation, lattice	3283
	E. Prat W. Decking, T. Limberg, F. Loehl DESY, Hamburg K. Honkavaara Uni HH, Hamburg
	FLASH (Free Electron LASer in Hamburg) is a SASE FEL user facility at DESY, Hamburg. It serves also as a pilot project for the European XFEL. Although the slice emittance is a more appropriate parameter to characterize the SASE process, the projected emittance is a good indicator of the electron beam quality which can be measured in an easy and fast way. In this paper we present measurements of the projected emittance along FLASH. We also analyze the effect of the dispersion on transverse electron beam profiles.

THPAN059	Proposal for an Enhanced Optical Cooling System Test in an Electron Storage Ring	electron, kicker, pick-up, storage-ring	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.

THPAN089	Beam Dynamics, Performance, and Tolerances for Pulsed Crab Cavities at the Advanced Photon Source for Short X-ray Pulse Generation	emittance, sextupole, photon, radiation	3429
	M. Borland L. Emery, V. Sajaev 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) has decided to implement a system using pulsed* crab cavities to produce short x-ray pulses using Zholents'** scheme. This paper describes beam dynamics issues related to implementation of this scheme in a single APS straight section. Modeling of the cavity is used to demonstrate that the deflection will be independent of transverse position in the cavity. Parameters and performance for a standard and lengthened APS straight section are shown. Finally, tolerances are discussed and obtained from tracking simulations. * M. Borland et al., these proceedings.** A. Zholents et al., NIM A 425, 385 (1999).

THPAN096	A 1-nm Emittance Lattice for the Advanced Photon Source Storage Ring	lattice, dynamic-aperture, emittance, damping	3447
	A. Xiao M. Borland, V. Sajaev 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 present a triple-bend lattice design that uses the current APS tunnel. The new lattice has a 1 nm-rad effective emittance at 7 GeV. A forty-period symmetric optics is presented. For the benefit of some X-ray user experiments, an optics with four special straight sections of one-third the beam size of normal sections was investigated as well. The associated nonlinear optical difficulties are addressed and simulation results are presented.

THPAS017	Numerical Algorithms for Modeling Electron Cooling in the Presence of External Fields	simulation, ion, electron, plasma	3549
	G. I. Bell I. Ben-Zvi, A. V. Fedotov, V. Litvinenko BNL, Upton, Long Island, New York D. L. Bruhwiler, A. V. Sobol Tech-X, Boulder, Colorado
	Funding: Work supported by the U. S. Department of Energy, Office of Science, Office of Nuclear Physics under contract DE-FG02-04ER84094. The design of the high-energy cooler for the Relativistic Heavy Ion Collider (RHIC) recently adopted a non-magnetized approach. To prevent recombination between the fully stripped gold ions and co-propagating electrons, a helical undulator magnet has been proposed. In addition, to counteract space-charge defocusing, weak solenoids are proposed every 10m. To understand the effect of these magnets on the cooling rate, numerical models of cooling in the presence of external fields are needed. We present an approach from first principles using the VORPAL parallel simulation code. We solve the n-body problem by exact calculation of pair-wise collisions. Simulations of the proposed RHIC cooler are discussed, including fringe field and finite interaction time effects.

THPAS092	Electron Cooling in the Presence of Undulator Fields	electron, ion, simulation, heavy-ion	3696
	A. V. Fedotov G. I. Bell, D. L. Bruhwiler, A. V. Sobol Tech-X, Boulder, Colorado I. Ben-Zvi, D. Kayran, V. Litvinenko, E. Pozdeyev BNL, Upton, Long Island, New York A. O. Sidorin, A. V. Smirnov JINR, Dubna, Moscow Region
	Funding: Work supported by the U. S. Department of Energy. The traditional electron cooling system used in low-energy coolers employs an electron beam immersed in a longitudinal magnetic field. In the first relativistic cooler, which was recently commissioned at Fermilab, the friction force is dominated by the non-magnetized collisions between electrons and antiprotons. The design of the higher-energy cooler for Relativistic Heavy Ion Collider (RHIC) recently adopted a non-magnetized approach which requires a low temperature electron beam. However, to avoid significant loss of heavy ions due to recombination with electrons in the cooling section, the temperature of the electron beam should be very high. These two contradictory requirements are satisfied in the design of the RHIC cooler with the help of the undulator fields. The model of the friction force in the presence of an undulator field was benchmarked vs direct numerical simulations with an excellent agreement. Simulations of ion beam dynamics in the presence of such a cooler and helical undulator is discussed in detail, including recombination suppression and resulting luminosities.

FRXKI01	Superconducting Magnet Needs for the ILC	quadrupole, dipole, superconducting-magnet, wiggler	3732
	J. C. Tompkins J. A. Clarke Cockcroft Institute, Warrington, Cheshire V. S. Kashikhin Fermilab, Batavia, Illinois M. A. Palmer CLASSE, Ithaca B. Parker BNL, Upton, Long Island, New York
	The ILC Reference Design Report will be completed early in 2007. The Magnet Systems Group was formed to translate magnetic field requirements into magnet designs and cost estimates for the Reference Design. As presently configured, the ILC will have more than 11,000 magnetic elements of which more than 1200 will be based on superconducting technology. This paper will describe the major superconducting magnet needs for the ILC as presently determined by the Magnet Systems Group and the leaders of the Area Systems Groups, responsible for beamline design. The superconducting magnet components include the Main Linac quadrupoles, the Positron Source undulators, the Damping Ring wigglers, and the complex array of Final Focus superconducting elements in the Beam Delivery System.
	Slides

FRYKI03	New Developments in Light Source Magnet Design	insertion-device, insertion, lattice, radiation	3751
	S. Prestemon S. Marks, D. Schlueter LBNL, Berkeley, California
	The rapid growth in the light source community throughout the world has served to motivate innovation in the magnet technologies that serve as the foundations for both the storage ring lattice magnet systems and the primary radiation sources, the insertion devices. Here a sampling of magnet system developments being pursued at diverse facilities are discussed, including combined-function magnets that minimize space requirements and improve accelerator performance, high performance bend magnets that provide enhanced radiation characteristics, and novel and untested concepts for future lattice magnets. Finally, we review developments in insertion devices that promise new performance characteristics to better serve the light source community.
	Slides

FROBC04	Thermomechanical Design of Normal-Conducting Deflecting Cavities at the Advanced Photon Source for Short X-ray Pulse Generation	controls, vacuum, storage-ring, 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

FRPMN017	Beam Position Monitor Calibration at the FLASH Linac at DESY	pick-up, electron, free-electron-laser, laser	3937
	N. Baboi P. Castro, O. Hensler, J. Lund-Nielsen, D. Noelle, L. M. Petrosyan, E. Prat, T. Traber DESY, Hamburg M. Krasilnikov, W. Riesch DESY Zeuthen, Zeuthen
	In the FLASH (Free electron LASer in Hamburg) facility at DESY more than 60 beam position monitors (BPM) with single bunch resolution are currently installed, and more are planned for future installation. Their calibration has been initially made by measuring each electronics board in the RF laboratory. However the ultimate calibration of each monitor is made by measuring its response to beam movement. This is a time-consuming procedure depending on the availability and accuracy of other components of the machine such as corrector magnets. On the other hand it has the advantage of getting in one measurement the answer of the monitor with all its components and of being independent of the monitor type. The calibration procedure and particularities for various types of BPMs in various parts of the linac will be discussed. A procedure based on the response matrices is also now under study. This would significantly speed up the calibration procedure, which is particularly important in larger accelerators such as the European XFEL (X-ray Free Electron Laser), to be built at DESY.

FRPMN018	Wake Computations for Undulator Vacuum Chambers of PETRA III	vacuum, synchrotron, impedance, insertion	3943
	R. Wanzenberg K. Balewski DESY, Hamburg E. Gjonaj, T. Weiland TEMF, Darmstadt
	At DESY it is planned to convert the PETRA ring into a synchrotron radiation facility, called PETRA III. The wake fields of a tapered transition from the standard vacuum chamber to the small gap chamber of the insertion devices contribute significantly to the impedance budget of PETRA III. The computer codes MAFIA and PBCI have been used to determine the loss and kick parameter of the tapered transition. PBCI is a recently developed parallelized, fully 3D wake field code, which is using a purely explicit, split-operator scheme to solve the Maxwell equation in the time domain.

FRPMN102	An Instrument Design for the Accurate Determination of the Electron Beam Location in the Linac Coherent Light Source Undulator	alignment, electron, vacuum, linac	4324
	J. L. Bailey D. Capatina, J. W. Morgan ANL, Argonne, Illinois H.-D. Nuhn SLAC, Menlo Park, California
	Funding: Work supported by U. S. Department of Energy, under Contract Nos. DE-AC02-06CH11357 and DE-AC03-76SF00515. The Linac Coherent Light Source (LCLS), currently under design, requires accurate alignment between the electron beam and the undulator magnetic centerline. A Beam Finder Wire (BFW) instrument has been developed to provide beam location information that is used to move the undulators to their appropriate positions. A BFW instrument is mounted at each of the 33 magnets in the undulator section. Beam detection is achieved by electrons impacting two carbon fiber wires and then sensing the downstream radiation. The wires are mounted vertically and horizontally on a wire card similar to that of a traditional wire scanner instrument. The development of the BFW presents several design challenges due to the need for high accuracy of the wires' location and the need for removal of the wires during actual operation of the LCLS (30 microns repeatability is required for the wire locations). In this paper, we present the technical specification, design criteria, mechanical design, and results from prototype tests for the BFW.

FRPMN106	Progress toward a Hard X-ray Insertion Device Beam Position Monitor at the Advanced Photon Source	photon, target, insertion, insertion-device	4342
	G. Decker P. K. Den Hartog, O. Singh ANL, Argonne, Illinois G. Rosenbaum UGA, Athens, Georgia
	Funding: Work supported by the U. S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357. Long-term pointing stability at synchrotron light sources using conventional rf-based particle beam position monitoring is limited by the mechanical stability of the pickup electrode assembly. Photoemission-based photon beam position monitors for insertion device beams suffer from stray radiation backgrounds and other gap-dependent systematic errors. To achieve the goal of 500-nanoradian peak-to-peak pointing stability over a one-week period, the development of a photon beam position detector sensitive only to hard x-rays (> several keV) using copper x-ray fluorescence has been initiated. Initial results and future plans are presented.

FRPMN111	Design and Performance of the LCLS Cavity BPM System	dipole, linac, coupling, alignment	4366
	R. M. Lill L. H. Morrison, W. E. Norum, N. Sereno, G. J. Waldschmidt, D. R. Walters ANL, Argonne, Illinois S. Smith, T. Straumann SLAC, Menlo Park, California
	Funding: Work supported by U. S. Department of Energy under Contract Nos. DE-AC02-06CH11357 and DE-AC03-76SF00515 In this paper we present the design of the beam position monitor (BPM) system for the LCLS undulator, which features a high resolution X-band cavity BPM. Each BPM has a TM010 monopole reference cavity and a TM110 dipole cavity designed to operate at a center frequency of 11.384 GHz. The signal processing electronics features a low-noise single-stage three-channel heterodyne receiver that has selectable gain and a phase locking local oscillator. We will discuss the system specifications, design, and prototype test results.

FRPMN118	LCLS-S1 Optical Transition Radiation Monitor	linac, radiation, diagnostics, target	4396
	W. Berg L. Erwin, S. E. Shoaf, B. X. Yang ANL, Argonne, Illinois
	Funding: Work supported by the U. S. Department of Energy, under Contract Nos. DE-AC02-06CH11357 and DE-AC03-76SF00515. ANL has developed a high-resolution optical transition radiation (OTR) imaging monitor system for the LCLS injection linac at SLAC. The imaging station, OTR-S1, will be located at the S1 spectrometer with a beam energy of 135 MeV. The system will be used to acquire 2-D transverse beam distributions of the accelerated photocathode-gun-generated electron beam. We anticipate an average beam current of 0.2-1 nC and nominal beam spot size of σ-x 130 microns, σ-y 100 microns. The imaging system was designed for a field of view h/v: 10x7.5 mm. The spatial resolution of ~12 microns was verified over the central 5x4 mm region in the visible. A 12-bit digital camera acquires the image and a Mac-based digital frame capturing system was employed for the initial lab-based performance testing of the device. We are reporting on system development, image capture system, testing methodology, and test data analysis. Commissioning results will be reported as they become available.

FRPMS088	Intrabeam Scattering and Touschek Lifetime for the Optical Stochastic Cooling experiment at the MIT-Bates South Hall Ring	emittance, damping, insertion, synchrotron	4279
	F. Wang W. A. Franklin, C. Tschalaer, D. Wang, J. van der Laan MIT, Middleton, Massachusetts
	A proof-of-principal experiment of Optical Stochastic Cooling (OSC) at the MIT-Bates South Hall electron storage ring (SHR) has been proposed. To produce convincing cooling results, the ring will be run near 300 MeV. Beam emittances growth caused by Intrabeam scattering (IBS) is a major concern for the design of experiment. Touschek scattering imposes a dominant limit on beam lifetime. Evaluation of these effects is part of the design optimization process. Simulation analyses of cooling for a viable OSC experiment are presented.

FRPMS102	Preliminary Impedance Budget for the NSLS-II Storage Ring	impedance, vacuum, storage-ring, 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.