PAC07 - List of Keywords (insertion)

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insertion

Paper	Title	Other Keywords	Page
MOXKI01	LHC: Construction and Commissioning Status	dipole, quadrupole, cryogenics, injection	1
	L. R. Evans
	The LHC is now in its final phase of hardware commissioning. The whole ring is complete apart from a few elements in the matching regions yet to be installed. The first of the eight sectors has been cooled down and power tests to full energy are underway. Beam commissioning will start as soon as the last sector becomes available, hopefully before the end of 2007. The commissioning plan foresees a short "engineering" run with colliding beams at or near the injection energy of 450 GeV. This will be followed by a shutdown to finish installing the detectors and to commission the last sectors to full current. A review of the commissioning status to date will be given.
	Slides

MOZAC01	Techology Transfer - When, Why, Issues and Advantages	controls, storage-ring, site, superconducting-magnet	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

MOPAN008	A Single Bunch Selector for the Next Low β Continuous Wave Heavy Ion Beam	heavy-ion, ion, simulation, linac	158
	G. E. Le Dem M. Di Giacomo GANIL, Caen
	Funding: Eurisol Project supported by the European Commission under contract N? 515768 RIDS The Eurisol heavy ion post-accelerator and the Spiral2 deuton/ion MEBT should transport a continuous wave (cw) beam from respectively a 88.05 MHz RFQ (β respectively 0.036 and 0.04) to a drift-tube linac. A high frequency chopper is being studied to select only 1 bunch over N, 10 < N < 10000 as asked by the physicists. It requires pulses higher than 3 kV, rising in less than 7 ns at a repetition rate up to 8.8 MHz. These figures are at the border of what can be provided by the travelling wave fast choppers and the capacitive-type chopping technologies. We have reviewed the current fast and slow chopping structures and their associated pulse generator. Some preliminary RF simulations to adapt the present chopping devices to our requirements are presented. The main limitations of these technologies when applied to isolate bunches in ion cw accelerators are also shown. Our first studies and results to solve the arising problems are discussed.

MOPAN063	Extremely Low-jitter FPGA Based Synchronization Timing System	controls, diagnostics, power-supply, gun	296
	J. Dedic D. Golob, A. Hasanovic, M. Plesko Cosylab, Ljubljana
	Injection-involved synchronization timing system must provide synchronization triggers and clocks with the jitter values in the range of few tens of ps. A well-thought-out system-level design approach was necessary, splitting a design into several sub-modules, each addressing the specific synchronization issue. Tight synchronization between the unrelated RF signal and external trigger is based on a PLL phase-shifted over-sampling technique. Beam-monitoring instrumentation synchronization is also handled. An emphasis was put into a design, offering an installation without calibration. Utilizing state-of-the art FPGA circuits we designed a purely digital system, without analogue components (i.e. delay lines) that would require a time-consuming calibration and lead to increasing jitter for long delay ranges. Finally, regardless of its complexity the timing solution has to provide seamless integration into the accelerator facility. To leverage the performance, offered by a dedicated state-of-the-art HW, with flexibility, offered by a SW solution, we used a standard device for peripheral CS integration, based on an embedded processor running OS - a part of a microIOC family of products.

MOPAN067	Transport and Installation of the LHC Cryo-Magnets	factory, acceleration, dipole, controls	305
	K. Artoos S. Bartolome-Jimenez, O. Capatina, J. M. Chevalley, K. Foraz, M. Guinchard, C. Hauviller, K. Kershaw, S. Prodon, I. Ruehl, G. Trinquart, S. Weisz CERN, Geneva P. Ponsot DBS, Saint Genis-Pouilly
	Eleven years have passed between the beginning of transport and handling studies in 1996 and the completion of the LHC cryo-magnets installation in 2007. More than 1700 heavy, long and fragile cryo-magnets had to be transported and installed in the 27 km long LHC tunnel with very restricted available space. The size and complexity of the project involved challenges in the field of equipment design and manufacturing, maintenance, training and follow-up of operators and logistics. The paper presents the milestones, problems to be overcome and lessons learned during this project.

MOPAN073	Parametric Study of Heat Deposition from Collision Debris into the Insertion Superconducting Magnets for the LHC Luminosity Upgrade	quadrupole, luminosity, target, superconducting-magnet	323
	C. Hoa F. Broggi INFN/LASA, Segrate (MI) F. Cerutti, J.-P. Koutchouk, G. Sterbini, E. Y. Wildner CERN, Geneva
	With a new geometry in a higher luminosity environment, the power deposition in the superconducting magnets becomes a critical aspect to analyze and to integrate in the insertion design. In this paper, we quantify the power deposited in magnets insertion at variable positions from the interaction point (IP). A fine characterization of the debris due to the proton-proton collisions at 7 TeV, shows that the energetic particles in the very forward direction give rise to non intuitive dependences of the impacting energy on the magnet front face and inner surface. The power deposition does not vary significantly with the distance to the interaction point, because of counterbalancing effects of different contributions to power deposition. We have found out that peak power density in the magnet insertion does not vary significantly with or without the Target Absorber Secondaries (TAS) protection.

MOPAN077	Geometry of the LHC Short Straight Sections Before Installation in the Tunnel: Resulting Aperture, Axis and BPM Positioning	quadrupole, laser, alignment, controls	335
	D. P. Missiaen P. Bestmann, M. C.L. Buzio, S. D. Fartoukh, M. Giovannozzi, J. B. Jeanneret, A. M. Lombardi, Y. Papaphilippou, S. Pauletta, J. C. Perez, H. Prin, E. Y. Wildner CERN, Geneva
	The Large Hadron Collider Short Straight Sections (SSS) are currently being installed in their final position in the accelerator tunnel. For all the SSSs, both those in the regular arcs as well as those in the insertion regions, magnetic and geometric measurements are made at different steps of their assembly. These stages range from production in the industry to the cryostating at CERN, as well as during and after cold tests or during installation of the BPM and the cold warm transition for the stand alone magnets. The results of the geometry at the various production stages by means of different procedures and analysis tools are reported and discussed in details in this paper.

MOPAN085	Completion of the Series Fabrication of the Main Superconducting Quadrupole Magnets of LHC	quadrupole, factory, dipole, cryogenics	356
	T. Tortschanoff R. Burgmer, H.-U. Klein, D. Krischel, B. Schellong, P. Schmidt ACCEL, Bergisch Gladbach M. Durante, A. Payn, J.-M. Rifflet, F. Simon CEA, Gif-sur-Yvette M. Modena, Y. Papaphilippou, L. Rossi, K. M. Schirm CERN, Geneva
	By end of November 2006, the last cold mass of the main superconducting quadrupole cold masses were delivered by ACCEL Instruments to CERN. This comprised 360 cold masses for the arc regions of the machine and 32 special units dedicated to the dispersion suppressor regions. The latter ones contain the same main magnet but different types of correctors and are of increased length with respect to the regular arc ones. The end of the fabrication of these magnets coincided with the end of the main dipole deliveries allowing a parallel assembly into their cryostats and installation into the LHC tunnel. The positioning into the tunnel was optimized using the warm field measurements performed in the factory. On the other hand the correct slotting of the quadrupoles was complicated due to the multitude of variants and by the fact that a number of units needed to be replaced by spares which in some cases required a reshuffling of the positioning. The paper gives some final data about the successful fabrication at ACCEL Instruments and explains the issue of their best positions in the machine.

MOPAS091	RHIC Power Supplies-Failure Statistics for Runs 4, 5 and 6	power-supply, collider, controls, dipole	640
	D. Bruno G. Ganetis, G. Heppner, W. Louie, J. Sandberg, C. Schultheiss BNL, Upton, Long Island, New York
	Funding: Work performed under Contract No. DE-AC02-98CH10886 with the U. S. Department of Energy. The two rings in the Relativistic Heavy Ion Collider (RHIC) require a total of 933 power supplies to supply current to highly inductive superconducting magnets. Failure statistics for the RHIC power supplies will be presented for the last three RHIC runs. The failures of the power supplies will be analyzed. The statistics associated with the power supply failures will be presented. Comparisons of the failure statistics for the last three RHIC runs will be shown. Improvements that have increased power supply availability will be discussed. Further improvements to increase the availability of the power supplies will also be discussed.

TUPMN004	Final Adjustment of the Magnetic Field of the LNLS VUV Undulator.	multipole, undulator, radiation, 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.

TUPMN006	Apple-II and TESLA FEL Undulators at Danfysik A/S	undulator, insertion-device, 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/

TUPMN009	Commissioning of the SOLEIL Synchroton Radiation Source	feedback, injection, insertion-device, coupling	932
	A. Nadji J. C. Besson, F. Bouvet, P. Brunelle, A. Buteau, L. Cassinari, M.-E. Couprie, J.-C. Denard, J.-M. Filhol, C. Herbeaux, J.-F. Lamarre, V. Le Roux, P. Lebasque, M.-P. Level, A. Loulergue, P. Marchand, L. S. Nadolski, R. Nagaoka, B. Pottin, M.-A. Tordeux SOLEIL, Gif-sur-Yvette
	The French 3rd generation synchrotron light source, SOLEIL, was successfully commissioned in 2006. The Linac and the Booster are operational at their design performances. During the early phase of the storage ring commissioning, the essential design parameters were reached very quickly while the project incorporates some innovative techniques such as the use of a superconducting RF cavity, solid state RF amplifiers, NEG coating for all straight parts of the storage ring and new BPM electronics. Prior to the start of the commissioning, some insertion devices and most of the insertion devices low gap vacuum vessels, including 10 mm inner vertical aperture vessels for the Apple-II type, were installed on the ring. The main results of the commissioning will be reviewed here, including discussion on diagnostics performances, orbit stability and control, optics correction, Top-up and the challenges in achieving operational status. The 10 beamlines of phase 1 are now under commissioning and regular user operation will start by spring 2007.

TUPMN010	Latest Developments of Insertion Devices at ACCEL Instruments	undulator, insertion-device, 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.

TUPMN042	Simulation Study of Resistive-wall Beam Breakup for ERLs	simulation, focusing, vacuum, insertion-device	1010
	N. Nakamura H. Sakai, H. Takaki ISSP/SRL, Chiba
	For future ERL-based light sources, average beam current is required to be up to 100 mA. Such a high-current multi-bunch beam may generate and cumulate strong long-range wake-fields by interaction with accelerator components such as superconducting cavities and vacuum ducts, and as a result, strong beam breakup(BBU) may occur. Resistive-wall BBU due to narrow and resistive vacuum ducts has been hardly studied, though the effects of BBU due to HOMs of superconducting cavities were much investigated. Asymptotic expressions of transverse resistive-wall BBU were derived for a beam that passes through a uniform resistive pipe under uniform external focusing. However the expressions are valid only for limited parameter ranges and initial conditions. Therefore we have developed a computer simulation program to study transverse multi-bunch resistive-wall BBU more minutely and generally. In this paper, we will present the simulation results obtained by the simulation program and also compare them with the asymptotic expressions. J. M. Wang and J. Wu, PRST-AB 7, 034402(2004)

TUPMN045	PF-Ring and PF-AR Operational Status	injection, undulator, 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.

TUPMN071	Planning of Insertion Devices for 3 GeV Taiwan Photon Source	undulator, photon, 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.

TUPMN083	Electron Beam Dynamics in 4GLS	electron, linac, laser, sextupole	1103
	P. H. Williams G. J. Hirst STFC/RAL, Chilton, Didcot, Oxon B. D. Muratori, H. L. Owen, S. L. Smith STFC/DL/ASTeC, Daresbury, Warrington, Cheshire
	Funding: Some of the work reported in this paper is supported by the EuroFEL programme. Studies of the electron beam dynamics for the 4GLS design are presented. 4GLS will provide three different electron bunch trains to a variety of user synchrotron sources. The 1 kHz XUV-FEL and 100 mA High Average Current branches share a common 540 MeV linac, whilst the 13 MHz IR-FEL must be well-synchronised to them. An overview of the injector designs, electron transport, and energy recovery is given, including ongoing studies of coherent synchrotron radiation, beam break-up and wakefields. This work is being pursued for the forthcoming Technical Design Report due in 2008.

TUPMN101	A Study of the Minimum Wall Thickness for an Extruded Aluminum Vacuum Chamber	vacuum, undulator, 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.

TUPMS002	Successful Completion of the Femtosecond Slicing Upgrade at the ALS	undulator, 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.

TUPMS027	Development of Software to Control 8-Motor Elliptically Polarizing Undulators	controls, undulator, power-supply, target	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.

TUPMS045	Improvements to the Aladdin Synchrotron Light Source	insertion-device, synchrotron, quadrupole, undulator	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.

TUPMS071	Upgrade Alternatives for the NSLS Superconducting Wiggler	wiggler, photon, radiation, insertion-device	1335
	M. G. Fedurin P. Mortazavi, J. B. Murphy, G. Rakowsky BNL, Upton, Long Island, New York
	The superconducting wiggler (SCW) with 4.2 Tesla field in 5 main poles has been in operation on the NSLS X-ray storage ring for more than 20 years. The inefficient cryogenic system of this wiggler uses a closed-cycle refrigerator requiring constant maintenance. It is possible to replace this insertion device with a 13-pole SCW originally built by Oxford Instruments. The cryostat of this device could be upgraded to reduce the liquid He consumption using cryocoolers, thereby greatly reducing the refrigerator operating expense. A second option is a new design of a SCW with a magnetic period and number of poles appropriate to the current users needs. All these upgrade possibilities will be described in the paper.

TUPMS073	Dispersion Tolerance Calculation for NSLS-II	emittance, insertion-device, wiggler, damping	1341
	W. Guo S. Krinsky, F. Lin BNL, Upton, Long Island, New York
	The approach for the proposed National Synchrotron Light Source II to reach small transverse emittances is to deploy damping wigglers. In the ideal lattice the dispersion is zero in the straight sections, therefore the damping wigglers supply only damping effect. In reality the residual dispersion can be generated by the lattice errors, trim dipoles, and the insertion devices. We will discuss dispersion introduced by different sources and calculate the tolerances. Possible correction schemes will also be presented.

TUPMS086	Insertion Device R&D for NSLS-II	undulator, 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.

TUPMS092	GdfidL Simulations of Non-Linear Tapers for ILC Collimators	simulation, impedance, emittance, luminosity	1380
	J. D.A. Smith
	This paper summarises the GdfidL simulations relating to non-linear collimators, which offer the potential for improved wakefield performance at the ILC. Such collimators provide a further method for understanding the performance of simulation software in this challenging regime. Our results are compared with data from ESA at SLAC.

TUPMS093	Computations of Wakefields in the ILC Collimators	simulation, quadrupole, dipole, emittance	1383
	J. D.A. Smith C. J. Glasman UMAN, Manchester
	The collimators in the ILC serve the dual purpose of reducing the beam halo and as of a form of machine protection from potentially miss-steered beams. However, there is a significant wakefield in the immediate vicinity of the beam caused by their presence. It is important to be able to predict this short-range wakefield and the extent which it dilutes the emittance of the beam. We extend the previous analysis, * of wake-fields in collimators to realistic short bunches applicable to the ILC. We achieve these results using the finite difference code GdfidL. The angular wake is decomposed into its constituent components for rectangular collimators and compared with their circular collimator counterparts. Comparisons are made between these simulations, existing analytical models, and experimental results. * C. Beard and R. M. Jones, EUROTeV-Report-2006-103** C. Beard and J. Smith, EPAC06 Proc. MOPLS070

TUPAN031	Touschek Background and Beam Lifetime Studies for the DAFNE Upgrade	simulation, background, optics, scattering	1454
	M. Boscolo M. E. Biagini, S. Guiducci, P. Raimondi INFN/LNF, Frascati (Roma)
	For the low energy collider DAFNE the machine induced backgrounds into the experiments as well as the beam lifetime are dominated by the Touschek effect. Many efforts have been put in its reduction: by adjusting optical parameters, by inserting additional collimators, as well as by simulating and tracking scattered particles in order to find the proper actions that allow reducing these effects. Studies on the distribution and trajectories of the Touschek particles along the ring are discussed here for the Siddarta run configuration with the crabbed waist scheme, together with an evaluation of the beam lifetime. Effectiveness of the scrapers installed in the two rings has been investigated with the new machine configuration and new optimized positions along the beam pipe have been found.

TUPAN080	Screening of Cyclotron Magnetic Field in C400 Axial Injection Beam-line	cyclotron, injection, shielding, simulation	1559
	N. Yu. Kazarinov V. Aleksandrov, V. Shevtsov, A. Tuzikov JINR, Dubna, Moscow Region Y. Jongen IBA, Louvain-la-Neuve
	The screening of the optical elements placed at the horizontal part of the axial injection beam-line of the C400 cyclotron for hadron therapy is performed. An influence of the injection channel shielding elements on magnetic field distribution in the median plane of the C400 cyclotron was studied. The 3D ANSYS model is used for this purpose.

TUPAN085	LHC Impedance Reduction by Nonlinear Collimation	impedance, collimation, betatron, damping	1571
	J. Resta-Lopez A. Faus-Golfe IFIC, Valencia F. Zimmermann CERN, Geneva
	A nonlinear collimation system can allow larger aperture for the mechanical jaws, and it thereby can help to reduce the collimator impedance, which presently limits the LHC beam intensity. Assuming the nominal LHC beam at 7 TeV, we show how a nonlinear betatronic collimation insertion would reduce considerably the LHC coherent tune shift for the most critical coupled-bunch mode as compared with the conventional baseline linear collimation system of Phase-I. In either case, the tune shifts of the most unstable modes are compared with the stability diagrams for Landau damping.

TUPAN100	Performance Reach of the	collimation, proton, injection, simulation	1613
	G. Robert-Demolaize R. W. Assmann, C. B. Bracco, S. Redaelli, Th. Weiler CERN, Geneva
	State-of-the-art tracking tools have been developed for detailed LHC collimation and beam loss studies. This includes full chromatic treatment of both beam lines and error models. This paper reviews the main results on the performance reach of the multi-stage LHC collimation system that is being installed in the LHC. Limitations on the allowed proton loss rates and the stored intensity can be derived from the comparison of local losses with estimated quench limits for the superconducting magnets. The origins of the cleaning-related performance limitations are presented and possible improvements are discussed.

TUPAN102	Numerical Study of the Very Forward Background from the Proton-Proton Collisions in the Experimental Insertions of the LHC	simulation, background, hadron, luminosity	1619
	V. Talanov H. Burkhardt, D. Macina, E. Tsesmelis CERN, Geneva
	The results from the numerical DPMJET-FLUKA simulation of the background in the experimental IR's of the LHC are presented. DPMJET3 is used for the generation and analysis of the products from the p-p collision leaving the interaction point in the very forward region. A multi-particle transport code FLUKA is used for the simulation of the resulting secondary cascades in the structure of the LHC long straight sections. The background formation is estimated and analyzed in the LSS's at the locations of the TAN absorber, Roman Pot stations and Beam Loss Monitors, for the purposes of the machine protection and planning of the operation of the detectors.

WEOAC03	Transverse Impedance of LHC Collimators	impedance, injection, octupole, collimation	2003
	E. Metral G. Arduini, R. W. Assmann, A. Boccardi, T. Bohl, C. B. Bracco, F. Caspers, M. Gasior, O. R. Jones, K. K. Kasinski, T. Kroyer, S. Redaelli, G. Robert-Demolaize, G. Rumolo, R. J. Steinhagen, Th. Weiler, F. Zimmermann CERN, Geneva F. Roncarolo UMAN, Manchester B. Salvant EPFL, Lausanne
	The transverse impedance in the LHC is expected to be dominated by the numerous collimators, most of which are made of Fibre-Reinforced-Carbon to withstand the impacts of high intensity proton beams in case of failures, and which will be moved very close to the beam, with full gaps of few millimetres, in order to protect surrounding super-conducting equipments. We present an estimate of the transverse resistive-wall impedance of the LHC collimators, the total impedance in the LHC at injection and top energy, the induced coupled-bunch growth rates and tune shifts, and finally the result of the comparison of the theoretical predictions with measurements performed in 2004 and 2006 on a prototype collimator installed in the SPS.
	Slides

WEPMN011	Multichannel Downconverter for the Next Generation RF Field Control for VUV- and X-Ray Free Electron Lasers	controls, free-electron-laser, laser, electron	2071
	M. Hoffmann F. Ludwig, H. Schlarb, S. Simrock DESY, Hamburg
	Funding: We acknowledge financial support by DESY Hamburg and the EUROFEL project. For pump- and probe experiments at VUV- and X-ray free-electron lasers the stability of the electron beam and timing reference must be guaranteed in phase for the injector and bunch compression section within a resolution of 0.01 degree (rms) and in amplitude within 1 10^-4 (rms). The performance of the field detection and regulation of the acceleration RF critically influences the phase and amplitude stability. For the RF field control, a multichannel RF downconverter is used to detect the field vectors and control the vectorsum of 32 cavities. In this paper a new design of an 8 channel downconverter is presented. The downconverter frontend consists of a passive rf double balanced mixer input stage, intermediate filters and an integrated 16bit analog-to-digital converter (ADC). The design includes a digital motherboard for data preprocessing and communication with the controller. In addition we characterize the downconverter performance in amplitude and phase jitter, temperature drifts and channel crosstalk in laboratory environment as well as for accelerator operation.

WEPMN016	Installation and Commissioning of the New 150 kW Plant for the Elettra RF System Upgrade	power-supply, booster, insertion-device, klystron	2080
	A. Fabris M. Bocciai, C. Pasotti, M. Rinaldi ELETTRA, Basovizza, Trieste
	Elettra is the Italian third generation light source in operation in Trieste since 1993. The project of upgrade of the Elettra RF system has become necessary to provide the needed operating margins when all the insertion devices are operational and in view of possible increases in beam current and energy. The first phase of the project regards one of the four plants, which has been upgraded from 60 to 150 kW cw. The power amplifier has been built combining two 80 kW IOTs (inductive output tubes) by means of a switchless combiner. The amplifier and the power plant components have been installed in the second half of year 2006. A coaxial to waveguide transition has been specially designed to interface the coaxial coupler of the cavity to the waveguide power transmission system, taking into account the risks connected to power from the higher order modes excited by the beam in the cavity. After giving an overview of the project, this paper discusses the technical choices adopted, the tests performed during the installation phase and the commissioning of the new system with beam during machine operation.

WEPMN037	Manufacture and Assembly of the 6 Meter-Long Cryomodules for Superconducting RF Test Facility (STF) at KEK	vacuum, cryogenics, radiation, factory	2122
	T. Semba Y. Itou, S. Kajiura, T. Masumoto, T. Tagawa Hitachi Ltd., Ibaraki-ken S. Noguchi, N. Ohuchi, K. Saito, A. Terashima, K. Tsuchiya KEK, Ibaraki
	The Superconducting RF Test Facility (STF) has been developed at KEK as an R&D toward ILC (International Linear Collider). Hitachi carried out the fabrication of STF cryostat components and in si-tu assembly of cryomodules cooperated with KEK. Our objective is obtaining the manufacturing experience of long cryostats for superconducting cavities. STF cryomodules are designed on the basis of TESLA design. Those major components are : vacuum vessels, support posts, 80K radiation shields, 5K radiation shields, helium gas return pipe, cryogenic piping, cavity helium vessels, RF input couplers, various measurement equipments and sensors. Two units of 6-meter long cryostat are designed to contain maximum eight 9-cell cavities in total. At the first step of the cryomodules, two different types of cavities and some equipments have been carefully prepared and installed by KEK. This paper briefly presents the structural design of STF cryostat components, cryomodule assembly procedures with specially designed tooling, and a summary for the next step.

WEPMN072	Material Selection and Characterization for High Gradient RF Applications	laser, target, linear-collider, collider	2197
	M. Taborelli G. Arnau-Izquierdo, S. Calatroni, S. T. Heikkinen, T. Ramsvik, S. Sgobba, W. Wuensch CERN, Geneva
	The selection of candidate materials for the accelerating cavities of the Compact LInear Collider (CLIC) is carried out in parallel with high power RF testing. The DC breakdown field of copper, copper alloys, refractory metals, titanium and aluminium have been measured with a dedicated setup. Higher maximum fields are obtained for refractory metals and for titanium, which exhibits important damages after conditioning. Fatigue behaviour of copper alloys has been studied for surface and bulk by pulsed laser irradiation and ultrasonic excitation, respectively. The selected copper alloys show consistently higher fatigue resistance than copper in both experiments. RF tests are planned. In order to obtain the best local properties a bi-metallic assembly is being studied for the accelerating structures. The mechanical strength of junctions of molybdenum and copper-zirconium C15000, made either by Hot Isostatic Pressing or explosion bonding was evaluated. The reliability of the results obtained with either technique should be improved. Testing in DC and RF is continued in order to select materials for a bi-metal exhibiting superior properties with respect to the combination C15000-Mo.

WEPMN102	A 96 Channel Receiver for the ILCTA LLRF System at Fermilab	controls, impedance, target, linac	2271
	U. Mavric J. Branlard, B. Chase, E. Cullerton, D. W. Klepec Fermilab, Batavia, Illinois
	The present configuration of an ILC Main Linac RF station has 26 nine cell cavities driven from one klystron. With the addition of waveguide power coupler monitors, 96 RF signals will be downconverted and processed. A downconverter chassis is being developed that contains 12 eight channel analog modules and a single upconverter module. This chassis will first be deployed for testing a cryomodule composed of eight cavities located at New Muon Laboratory (NML) - Fermilab. Critical parts of the design for LLRF applications are identified and a detailed description of the circuit with various characteristic measurements is presented. The board is composed of an input band-pass filter centered at 1.3GHz, followed by a mixer, which downconverts the cavity probe signal to a proposed 13 MHz intermediate frequency. Cables with 8 channels per connector and good isolation between channels are being used to interconnect each downconverter module with a digital board. As mixers and power splitters are the most sensitive parts for noise, nonlinearities and cross-talk issues, special attention is given to these parts in the design of the LO port multiplication and distribution.

WEPMS053	Yale Ka-Band Facility For High-Gradient Accelerator R&D: Status Report	vacuum, gun, shielding, plasma	2463
	J. L. Hirshfield, J. L. Hirshfield, E. V. Kozyrev, M. A. LaPointe Yale University, Physics Department, New Haven, CT S. V. Shchelkunov Columbia University, New York M. Y. Shmelyov IAP/RAS, Nizhny Novgorod V. P. Yakovlev Omega-P, Inc., New Haven, Connecticut
	Funding: Research sponsored by US DoE Development of a future multi-TeV warm collider demands new technological solutions and new accelerator structure materials. The Ka-Band test facility being put into operation at Yale University that centers on the Yale/Omega-P 34-GHz magnicon allows users to carry out high gradient experiments on RF breakdown, pulse fatigue, tests of new high power pulse manipulation systems, and RF components. The magnicon is now conditioned for a pulse width up to 1 μs, at an output power level high enough for basic studies of electric and magnetic RF field limits at surfaces of conductors and dielectrics. The high-power waveguide transmission system for the facility is assembled and ready for tests. It includes RF windows, phase shifters, 13 mm diameter TE 11 waveguides, mode converters, etc. Recently the assembled system has undergone conditioning in preparation for carrying out first "user" experiments.

WEPMS068	JLab High-Current CW Cryomodules for ERL and FEL Applications	damping, simulation, vacuum, linac	2493
	R. A. Rimmer R. Bundy, G. Cheng, G. Ciovati, E. Daly, R. Getz, J. Henry, W. R. Hicks, P. Kneisel, S. Manning, R. Manus, K. Smith, M. Stirbet, L. Turlington, L. Vogel, H. Wang, K. Wilson Jefferson Lab, Newport News, Virginia F. Marhauser JLAB, Newport News, Virginia
	Funding: 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. We describe the developments underway at JLab to develop new CW cryomodules capable of transporting up to Ampere-levels of beam currents for use in ERLs and FELs. Goals include an efficient cell shape, high packing factor for efficient real-estate gradient and very strong HOM damping to push BBU thresholds up by two or more orders of magnitude compared to existing designs. Cavity shape, HOM damping and ancillary components are optimized for this application. Designs are being developed for low-frequency (750 MHz), Ampere-class compact FELs and for high-frequency (1.5 GHz), 100 mA configurations. These designs and concepts can easily be scaled to other frequencies. We present the results of conceptual design studies, simulations and prototype measurements. These modules are being developed for the next generation ERL based high power FELs but may be useful for other applications such as high energy light sources, electron cooling, electron-ion colliders, industrial processing etc.

WEPMS089	Multipacting Analysis of a Quarter Wave Choke Joint used for Insertion of a Demountable Cathode into a SRF Photoinjector	cathode, gun, electron, simulation	2544
	A. Burrill I. Ben-Zvi BNL, Upton, Long Island, New York M. D. Cole, J. Rathke AES, Princeton, New Jersey P. Kneisel, R. Manus, R. A. Rimmer Jefferson Lab, Newport News, Virginia
	Funding: Work done under the auspices of the US DOE. The multipacting phenomena in accelerating structures and coaxial lines are well documented and methods of mitigating or suppressing it are understood. The multipacting that occurs in a quarter wave choke joint designed to mount a cathode insertion stalk into a superconducting RF photoinjector has been analyzed via calculations and experimental measurements and the effect of introducing multipacting suppression grooves into the structure is analyzed. Several alternative choke joint designs are analyzed and suggestions made regarding future choke joint development. Furthermore, the problems encountered in cleaning the choke joint surfaces, factors important in changes to the secondary electron yield, are discussed and evaluated. This design is being implemented on the BNL 1.3 GHz photoinjector, previously used for measurement of the quantum efficiency of bare Nb, to allow for the introduction of other cathode materials for study, and to verify the design functions properly prior to constructing our 703 MHz photoinjector with a similar choke joint design.

THXKI01	R&D in RF Superconductivity to Support the International Linear Collider	linear-collider, collider, acceleration, superconductivity	2559
	L. Lilje
	ILC-related R&D in SRF spans a broad range of topics, ranging from the search for high gradients through improved processes and cavity geometries, through the use of new materials (large-grain and single-crystal niobium metal) and development of superconducting joints to enable superstructure concepts and minimum length vacuum joints. This talk will review the status of the global ILC SRF R&D program and discuss plans for the future.
	Slides

THPMN081	Measuring Single Particle Amplitudes with MICE	emittance, factory, scattering, coupling	2895
	M. Apollonio
	The cooling of muons will be an essential element of a future neutrino factory. The Muon Ionization Cooling Experiment, MICE, to be built at RAL (UK) will be the first apparatus to demonstrate the feasibility of the ionisation cooling of muons. MICE will be unique in being able to make single-particle measurements. It will be possible to measure the amplitude of each muon in 6D phase space. We show how amplitude measurements can be used to quantify the transmission of the cooling channel and the increase in central phase space density due to cooling.

THPMN088	C-Band High Power RF Generation and Extraction Using a Dielectric Loaded Waveguide	acceleration, linac, extraction, vacuum	2912
	F. Gao M. E. Conde, W. Gai, R. Konecny, W. Liu, J. G. Power, Z. M. Yusof ANL, Argonne, Illinois C.-J. Jing Euclid TechLabs, LLC, Solon, Ohio T. Wong Illinois Institute of Technology, Chicago, Illinois
	Funding: Department of Energy We report on the fabrication, simulation, and high-power testing of a C-band RF power extractor recently conducted at the Argonne Wakefield Accelerator (AWA) facility. Dielectric loaded accelerating (DLA) structures can be used for high-power RF generation [,] when a high-current electron beam passes through a DLA structure and loses energy into the modes of the structure due to self-wakefields. The AWA generates high charge (up to 100nC), short bunch length (1.5mm~2.5mm) electron beams, which is ideal for high-power RF generation. The generated RF power can be subsequently extracted with a properly designed extraction coupler in order to accelerate a second beam, or for other high power purposes. In this paper, the detailed design of a 7.8 GHz DLA power extractor, MAFIA simulations, and results of the high-power test are presented. Simulation predictions of an 79 MW, 2.2 ns long RF pulse (generated by a single 100 nC electron bunch) and a longer RF pulse of the same power (obtained from a 35 nC periodic bunch train) will be compared to experimental results. W. Gai, et al, Experimental Demonstration of Two Beam Acceleration Using Dielectric Step-up Transformer, PAC01, pp.1880-1882.** D. Yu, et al, 21GHz Ceramic RF Power Extractor, AAC02, pp.484-505.

FROAKI01	Magnet Acceptance and Allocation at the LHC Magnet Evaluation Board	quadrupole, dipole, superconducting-magnet, alignment	3739
	L. Bottura P. Bestmann, N. Catalan-Lasheras, S. D. Fartoukh, S. S. Gilardoni, M. Giovannozzi, J. B. Jeanneret, M. Karppinen, A. M. Lombardi, K. H. Mess, D. P. Missiaen, M. Modena, R. Ostojic, Y. Papaphilippou, P. Pugnat, S. Ramberger, S. Sanfilippo, W. Scandale, F. Schmidt, N. Siegel, A. P. Siemko, D. Tommasini, T. Tortschanoff, E. Y. Wildner CERN, Geneva
	The normal- and superconducting magnets for the LHC ring have been carefully examined to insure that each of the more than 1800 assemblies is suitable for the operation in the accelerator. Magnet coordinators, hardware experts and accelerator physicists, joined in the LHC Magnet Evaluation Board, have contributed to this work that consists in the magnet acceptance, and the optimisation achieved by sorting magnets according to their geometry, field quality and quench level. This paper gives a description of the magnet approval mechanism that has been running since four years, reporting in a concise summary on the main results achieved. We take as specific indicators the computed mechanical aperture, the sorting efficiency with respect to systematic and random field errors in the magnets, and the case-by-case analysis necessary to accommodate hardware limitations such as quench limits and training.
	Slides

FRYKI03	New Developments in Light Source Magnet Design	insertion-device, undulator, 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

FROAC03	The Commissioning of the LHC Technical Systems	cryogenics, dipole, extraction, simulation	3801
	R. I. Saban R. Alemany-Fernandez, V. Baggiolini, A. Ballarino, E. Barbero-Soto, B. Bellesia, F. Bordry, D. Bozzini, M. P. Casas Lino, V. Chareyre, S. D. Claudet, G.-J. Coelingh, K. Dahlerup-Petersen, R. Denz, M. Gruwe, V. Kain, G. Kirby, M. Koratzinos, R. J. Lauckner, S. L.N. Le Naour, K. H. Mess, F. Millet, V. Montabonnet, D. Nisbet, B. Perea-Solano, M. Pojer, R. Principe, S. Redaelli, A. Rijllart, F. Rodriguez-Mateos, R. Schmidt, L. Serio, A. P. Siemko, M. Solfaroli Camillocci, H. Thiesen, W. Venturini Delsolaro, A. Vergara-Fernandez, A. P. Verweij, M. Zerlauth CERN, Geneva SF. Feher, R. H. Flora, R. Rabehl Fermilab, Batavia, Illinois
	The LHC is an accelerator with unprecedented complexity; in addition, the energy stored in magnets and the beams exceeds other accelerators by one to two orders of magnitude. To avoid a plague of technical problems and ensure a safe machine start-up, the hardware commissioning phase was emphasized: the thorough commissioning of technical systems (vacuum, cryogenics, quench protection, power converters, electrical circuits, AC distribution, ventilation, demineralised water, injection system, beam dumping system, beam instrumentation, etc) is carried-out without beam. Activity started in June 2005 with the commissioning of individual systems, followed by operating a full sector of the machine as a whole. LHC architecture allows the commissioning of each of the eight sectors independently from the others, before the installation of other sectors is complete. Important effort went into the definition of the programme and the organization of the coordination in the field, as well as in the tools to record and analyze test results. This paper presents the experience with this approach, results from the commissioning of the first LHC sectors and gives an outlook for future activities.
	Slides

FRPMN018	Wake Computations for Undulator Vacuum Chambers of PETRA III	vacuum, undulator, synchrotron, impedance	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.

FRPMN084	Beam Trip Event Diagnostic System for the TLS	diagnostics, controls, kicker, insertion-device	4264
	K. H. Hu J. Chen, K. T. Hsu, C. H. Kuo, C. Y. Wu NSRRC, Hsinchu
	The beam trip event diagnostic system includes several eight channels high-speed digitizer for data acquisition, PC base computer and optical fibre network applies to capture data. The PC are also to serve signal processing, beam trip event analysis and archive. This system can integrate beam trip, interlock signal of SRF, waveform of the injection kicker, quench and interlock signal of the superconducting insertion device, and instability of the stored beam. This diagnostic system can be routine monitor signal and record beam trip event. Design consideration and details of the implementation will be summarized in this report.

FRPMN106	Progress toward a Hard X-ray Insertion Device Beam Position Monitor at the Advanced Photon Source	photon, target, insertion-device, undulator	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.

FRPMS046	Optical-Fiber NOTCH Filter for Storage Ring Transverse Feedback System	feedback, storage-ring, 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.

FRPMS074	Measurements of the Transverse Collimator Wakefields due to Varying Collimator Characteristics	simulation, controls, impedance, feedback	4207
	S. Molloy C. D. Beard, J.-L. Fernandez-Hernando STFC/DL/ASTeC, Daresbury, Warrington, Cheshire A. Bungau UMAN, Manchester S. Seletskiy, M. Woods SLAC, Menlo Park, California J. D.A. Smith Cockcroft Institute, Warrington, Cheshire A. Sopczak Lancaster University, Lancaster N. K. Watson STFC/RAL/ASTeC, Chilton, Didcot, Oxon
	Funding: EUROtev Contract #011899RIDS US DOE Contract DEAC02-76SF00515 We report on measurements of the transverse wakefields induced by collimators of differing characteristics. An apparatus allowing the insertion of different collimator jaws into the path of a beam was installed in End Station A (ESA) in SLAC. Eight comparable collimator geometries were designed, including one that would allow easy comparison with previous results, and were installed in this apparatus. Measurements of the beam kick due to the collimator wakefields were made with a beam energy of 28.5 GeV, and beam dimensions of ~100 microns vertically and a range of 0.5 to 1.5 mm longitudinally. The trajectory of the beam upstream and downstream of the collimator test apparatus was determined from the outputs of ten BPMs (four upstream and six downstream), thus allowing a measurement of the angular kick imparted to the beam by the collimator under test. The transverse wakefield was inferred from the measured kick. The different aperture designs, data collection and analysis, and initial comparison to theoretical and analytic predictions are presented here. * "An Apparatus for the Direct Measurement of Collimator Transverse Wakefields", P. Tenenbaum, PAC '99** "Direct Measurement of the Resistive Wakefield in Tapered Collimators", P Tenenbaum, PAC '04

FRPMS088	Intrabeam Scattering and Touschek Lifetime for the Optical Stochastic Cooling experiment at the MIT-Bates South Hall Ring	emittance, undulator, damping, 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.

FRPMS113	Touschek Lifetime Calculations and Simulations for NSLS-II	emittance, insertion-device, controls, damping	4375
	C. Montag J. Bengtsson, B. Nash BNL, Upton, Long Island, New York
	Funding: Work performed under the auspices of the US Department of Energy. The beam lifetime in most medium-energy synchrotron radiation sources is limited by the Touschek effect, which describes the momentum transfer from the transverse into the longitudinal direction due to binary collisions between electrons. While an analytical formula exists to calculate the resulting lifetime, the actual momentum acceptance necessary to perform this calculation can only be determined by tracking. This is especially the case in the presence of small vertical apertures at insertion devices. In this case, nonlinear betatron coupling leads to beam losses at these vertical aperture restrictions. In addition, a realistic model of the storage ring is necessary for calculation of the equilibrium beam sizes (particularly in the vertical direction) which are important for a self-consistent lifetime calculation.