EPAC08 - List of Keywords (collider)

A B C D E F G H I K L M N O P Q R S T U V W

collider

Paper	Title	Other Keywords	Page
MOXAGM01	Status of the Large Hadron Collider (LHC)	cryogenics, quadrupole, controls, dipole	1
	F. Bordry CERN, Geneva
	The status of the LHC commissioning is presented. Preparation for smooth beam commissioning is going on since several years: very thorough commissioning of the highly complex hardware systems started already in 2005 preparation of the LHC beam commissioning, resulting in detailed procedures for various commissioning phases with increasing beam intensity and performance preparation of the injector complex, with beam up to the end of the transfer lines between SPS and LHC.
	Slides

MOYBGM01	Global R&D Effort for the ILC Linac Technology	linac, cryogenics, linear-collider, acceleration	12
	A. Yamamoto KEK, Ibaraki
	The presentation will cover the ongoing ILC R&D program in the field of superconducting accelerating structures, accelerator modules and rf systems. In addition to technical/scientific aspects, a view of the organisational challenges of this global R&D programme and how they are addressed will be described.
	Slides

MOPC087	The MERIT (nTOF-11) High Intensity Liquid Mercury Target Experiment at the CERN PS	target, proton, simulation, factory	262
	I. Efthymiopoulos, A. Fabich, A. Grudiev, F. Haug, J. Lettry, M. Palm, H. Pernegger, R. R. Steerenberg CERN, Geneva J. R.J. Bennett STFC/RAL/ISIS, Chilton, Didcot, Oxon O. Caretta, P. Loveridge STFC/RAL, Chilton, Didcot, Oxon A. J. Carroll, V. B. Graves, P. T. Spampinato ORNL, Oak Ridge, Tennessee H. G. Kirk, H. Park, T. Tsang BNL, Upton, Long Island, New York K. T. McDonald PU, Princeton, New Jersey N. V. Mokhov, S. I. Striganov Fermilab, Batavia, Illinois
	The MERIT (nTOF-11) experiment is a proof-of-principle test of a target system for high power proton beams to be used as a front-end for a neutrino factory complex or a muon collider. The experiment took data in autumn 2007 using the fast extracted beam from the CERN Proton Synchrotron (PS) with a maximum intensity of about 30TP per pulse. The target system, based on a free mercury jet, is capable of intercepting a 4-MW proton beam inside a 15-T magnetic field Such a field is required to capture the low-energy secondary pions which will provide the source of the required intense muon beams. Particle detectors have been installed around the target setup in order to measure the secondary particle flux out of the target and probe cavitation effects in the mercury jet when hit with variable intensity beams. The data analysis is ongoing: the results presented at this conference will demonstrate the validity of the liquid mercury target concept. For the MERIT collaboration.

MOPC118	Coordination of the Commissioning of the LHC Technical Systems	controls, dipole, cryogenics, quadrupole	340
	R. I. Saban, B. Bellesia, M. P. Casas Lino, C. Fernandez-Robles, M. Pojer, R. Schmidt, M. Solfaroli Camillocci, A. Vergara-Fernández CERN, Geneva
	The Large Hadron Collider operation relies on 1232 superconducting dipoles with a field of 8.33T and 400 superconducting quadrupoles with a strength of 220 T/m powered at 12kA, operating in superfluid He at 1.9K. For dipoles and quadrupoles as well as for many other magnets more than 1700 power converters are necessary to feed the superconducting circuits. A sophisticated magnet protection system is crucial to detect a quench and safely extract the energy stored in the circuits (about 1GJ only in one of the dipole circuits) after a resistive transition. Besides, in such complex architecture, many technical services (e.g. cooling and ventilation, technical network, electrical distribution, GSM network, controls system, etc.) have to be reliably available during commissioning. Consequently, the commissioning of the technical systems and the associated infrastructures has been carefully studied. Procedures, automatic control and analysis tools, repositories for test data, management structures for carrying out and following up the tests have been put in place. This paper briefly describes the management structure and the tools created to ensure safe, smooth and rapid commissioning.

MOPD030	The LHC radiation monitoring system for the environment and safety: from design to operation	radiation, monitoring, controls, injection	514
	L. Scibile, D. Forkel-Wirth, H. G. Menzel, D. Perrin, G. Segura Millan, P. Vojtyla, M. Widorski CERN, Geneva
	The RAdiation Monitoring System for the Environment and Safety (RAMSES) has been installed and successfully commissioned. The system was originally designed for the Large Hadron Collider (LHC), it was extended to the CNGS and it is also planned to further extend it to the rest of the CERN accelerators. This state-of-the-art radiation monitoring and alarm system provides permanent ambient dose equivalent rates and ambient dose equivalent measurement in the underground areas as well as on the surface inside and outside the CERN perimeter; it permanently monitors air and water released from the LHC and CNGS installations; it also integrates some conventional environmental measurement such as physicochemical parameters of released water. This paper illustrates the experience gained during the various project phases outlining the problems encountered and the solutions implemented. In addition, it gives a first feedback on the operational experience gained with the CNGS.

MOPP007	Wakefield Calculations - Comparison between Simulations and Experimental Data	simulation, emittance, impedance, dipole	562
	A. Bungau, R. J. Barlow UMAN, Manchester
	In linear colliders the collimator wakefields have a significant effect on emittance growth, beam jitter and background estimates. Each simulation code models the collimator wakefields using a different approach and a discussion of the formalism for incorporating wakefields into the particle tracking code Merlin is included in this paper. Using simple collimator types we present the different predictions for bunch shape effects, and also for the wakefield kicks. These kicks are also compared with experimental results from SLAC End Station A.

MOPP012	DC Breakdown Experiments for CLIC	linear-collider, RF-structure, cathode, vacuum	577
	A. Descoeudres, S. Calatroni, M. Taborelli CERN, Geneva
	For the production of the Compact Linear Collider (CLIC) RF structures, a material capable of sustaining high electric field, with a low breakdown rate and showing low damages after breakdowns is needed. A DC breakdown study is underway at CERN in order to test candidate materials and surface preparations, and also to have a better understanding of the breakdown mechanism. The saturated breakdown fields of several metals and alloys have been measured, ranging from 100MV/m for Al to 900MV/m for stainless steel, being around 150MV/m for Cu, CuZr and Glidcop, 300MV/m for W, 400MV/m for Mo, Nb and Cr, 650MV/m for V, and 750MV/m for Ti for example. Titanium shows a strong material displacement after breakdowns, while Cu, Mo and stainless steel are more stable. The conditioning speed of Mo can be significantly improved by removing oxides at the surface with a heat treatment, typically at 875°C for 2 hours. DC breakdown rate measurements have been done with Cu and Mo electrodes, showing similar results as in RF experiments: the breakdown probability seems to exponentially increase with the applied field.

MOPP017	A Kicker Driver Exploiting Drift Step Recovery Diodes for the International Linear Collider	kicker, damping, instrumentation, linear-collider	589
	F. O. Arntz, M. P.J. Gaudreau, A. Kardo-Sysoev, M. K. Kempkes, A. Krasnykh Diversified Technologies, Inc., Bedford, Massachusetts
	Diversified Technologies, Inc. (DTI) is developing a driver for a kicker strip-line deflector which inserts and extracts charge bunches to and from the electron and positron damping rings of the International Linear Collider. The kicker driver must drive a 50 Ω terminated TEM deflector blade at 10 kV with 2 ns flat-topped pulses, which according to the ILC pulsing protocol, bursts pulses at a 3 MHz rate within one-millisecond bursts occurring at a 5 Hz rate. The driver must also effectively absorb high-order mode signals emerging from the deflector. In this paper, DTI will describe current progress utilizing a combination of high voltage DSRDs (Drift Step Recovery Diodes) and high voltage MOSFETs. The MOSFET array switch, without the DSRDs, is itself suitable for many accelerator systems with 10 – 100 ns kicker requirements. DTI has designed and demonstrated the key elements of a solid state kicker driver which both meets the ILC requirements, is suitable for a wide range of kicker driver applications. Full scale development and test are exptected to occur in Phase II of this DOE SBIR effort, with a full scale demonstration scheduled in 2009.

MOPP030	ATF2 Final Focus Orbit Correction and Tuning Optimisation	sextupole, quadrupole, linear-collider, dipole	613
	A. Scarfe, R. Appleby UMAN, Manchester D. Angal-Kalinin, J. K. Jones STFC/DL/ASTeC, Daresbury, Warrington, Cheshire
	ATF2 is an upgrade to the ATF facility at KEK, Japan consisting of a replacement to the current ATF extraction line and the addition of a final focus section. The final focus system has been designed, and is aiming to test, the local chromaticity correction scheme as proposed for future linear colliders. The final focus system focuses the ultra-low emittance beams at the collision point in the linear collider. To provide the required small beam sizes and to maintain the beam sizes to nanometer level requires optimised orbit correction and tuning procedures. In this paper, the optimisation of the orbit correction using a global SVD method is discussed, along with the progress on final focus tuning knob analysis. The tuning algorithms used at ATF2 will provide an important feedback for future linear colliders (including the ILC and CLIC).

MOPP031	Challenges and Concepts for Design of an Interaction Region with Push-pull Arrangement of Detectors - an Interface Document	shielding, alignment, interaction-region, radiation	616
	A. Seryi, T. W. Markiewicz, M. Oriunno, M. K. Sullivan SLAC, Menlo Park, California D. Angal-Kalinin STFC/DL/ASTeC, Daresbury, Warrington, Cheshire B. Ashmanskas, V. R. Kuchler, N. V. Mokhov Fermilab, Batavia, Illinois K. Buesser DESY, Hamburg P. Burrows OXFORDphysics, Oxford, Oxon A. Enomoto, Y. Sugimoto, T. Tauchi, K. Tsuchiya KEK, Ibaraki A. Herve, J. A. Osborne CERN, Geneva A. A. Mikhailichenko Cornell University, Department of Physics, Ithaca, New York B. Parker BNL, Upton, Long Island, New York T. Sanuki Tohoku University, School of Scinece, Sendai J. Weisend NSF, Arlington H. Y. Yamamoto Tohoku University, Sendai
	Two experimental detectors working in a push-pull mode has been considered for the Interaction Region of the International Linear Collider [1]. The push-pull mode of operation sets specific requirements and challenges for many systems of detector and machine, in particular for the IR magnets, for the cryogenics system, for alignment system, for beamline shielding, for detector design and overall integration, and so on. These challenges and the identified conceptual solutions discussed in the paper intend to form a draft of the Interface Document which will be developed further in the nearest future. The authors of the present paper include the organizers and conveners of working groups of the workshop on engineering design of interaction region IRENG07 [2], the leaders of the IR Integration within Global Design Effort Beam Delivery System, and the representatives from each detector concept submitting the Letters Of Intent.

MOPP035	ILC Siting in Dubna Region (Russia) and ILC activity in JINR	site, diagnostics, linear-collider, laser	622
	G. Shirkov, Ju. Boudagov, Yu. N. Denisov, I. N. Meshkov, A. N. Sissakian, G. V. Trubnikov JINR, Dubna, Moscow Region
	The report presents the development of investigations on ILC siting in the Dubna region and ILC technical activity at JINR. Russia is one of candidates now for ILC hosting in the Dubna region. International intergovernmental status of JINR, stable geological and plain relief conditions comfortable location, well developed infrastructure create powerful advantages of JINR among other possible sites. Shallow layout of tunnels and experimental halls could significantly reduce the cost of conventional facilities and siting. Besides JINR physicists take part in several fields of activity in ILC: works on photo injector prototype, participation in design and construction of cryomodules, laser metrology, etc.

MOPP080	Studies of Breakdown in a Pressurized RF Cavity	electron, simulation, ion, emittance	736
	M. BastaniNejad, A. A. Elmustafa Old Dominion University, Norfolk, Virginia M. Alsharo'a, P. M. Hanlet, R. P. Johnson, S. Korenev, M. Kuchnir, D. J. Newsham, R. Sah Muons, Inc, Batavia C. M. Ankenbrandt, A. Moretti, M. Popovic, K. Yonehara Fermilab, Batavia, Illinois D. M. Kaplan Illinois Institute of Technology, Chicago, Illinois D. Li LBNL, Berkeley, California D. Rose, C. H. Thoma, D. R. Welch Voss Scientific, Albuquerque, New Mexico
	Previous studies of RF breakdown in a cavity pressurized with dense hydrogen gas have indicated that breakdown probability is proportional to a high power of the surface electromagnetic field. This behavior is similar to the Fowler-Nordheim description of electron emission from a cold cathode, and it implies that breakdown is a quantum mechanical effect that is characterized by the work function of the cavity metal. We describe our present efforts to measure the distributions of work functions at the nanoscale level on the surfaces of the electrodes used in breakdown studies, and to understand how the RF conditioning process affects them.

MOPP144	The First Cool-down Tests of the 6 Meter-Long-Cryomodules for Superconducting RF Test Facility (STF) at KEK	superconducting-RF, cryogenics, vacuum, linear-collider	892
	N. Ohuchi, F. Furuta, K. Hara, H. Hayano, N. Higashi, Y. Higashi, H. Hisamatsu, K. Hosoyama, E. Kako, Y. Kojima, M. Masuzawa, H. Matsumoto, H. Nakai, S. Noguchi, T. Saeki, K. Saito, T. Shishido, A. Terashima, N. Toge, K. Tsuchiya, K. Yokoya KEK, Ibaraki M. H. Tsai NSRRC, Hsinchu Q. J. Xu IHEP Beijing, Beijing
	KEK is presently constructing the Superconducting RF Test Facility (STF) as the center of the ILC-R&D in Asia from 2005. In this project, KEK aims to get the manufacturing and operational experiences of the RF cavity and cryomodule toward the ILC, and two cryomodules have been developed. These cryomodules are 6 meter long and have 4 nine-cell cavities in each cryostat. The basic cross section designs of the cryomodules are almost same as the design of TESLA type-III, however, each cryostat has the different type of cavities, TESLA type and Low-Loss type. The tests for the cryomodules are planed to be performed at three steps. In the first test, measurements of the cryogenic performances of these cryomodules are the main objective. One nine-cell cavity was assembled in each cryostat and the cool-down of the two cryomodules was performed. In the following tests, the four nine-cell cavities will be assembled in each cryostat as the complete integration and the beam test will be performed. In this paper, we will report the design of the cryomodules and the cryogenic performances at the first cold test.

MOPP146	The Coaxial Tuner for ILCTA_NML at Fermilab	cryogenics, superconductivity, vacuum, linear-collider	895
	A. Bosotti, C. Pagani, N. Panzeri, R. Paparella INFN/LASA, Segrate (MI)
	The piezo Blade Tuner prototype has been successfully tested inside the horizontal cryostat, CHECHIA, at DESY and extensive tests at BESSY are planned. As suggested by the cold test results, a few minor modifications have been implemented and a set of 8 improved devices is under construction for the installation in the second module of ILCTA at Fermilab. This reviewed design, together with a simplified helium tank in prototyping, should hopefully fulfill also the XFEL requests in term of performances and cost. In particular the use of thicker blades and their slightly different distribution along the circumference produces the increase of the tuner strength and stiffness that is needed in order to fulfill the pressure vessel regulations for qualification. As in the past, two equivalent devices, respectively in titanium and stainless steel, have been designed to maintain open the possibility of the use of a SS helium vessel once the required technology were developed. The results of the extensive mechanical tests performed to validate the estimated performances and life time are also presented.

MOPP154	Study of the High Pressure Rinsing Water Jet Interactions	target, controls, linear-collider, superconducting-RF	910
	D. Sertore, M. Fusetti, P. M. Michelato, C. Pagani INFN/LASA, Segrate (MI)
	High Pressure Rinsing (HPR) is an important step in the cleaning of Superconducting Cavities (SC). The understanding of the interaction of the high pressure water jet on the cavity wall is of primary importance for the optimization of this process for upcoming SC based projects like XFEL and ILC. In this paper, we extend our results obtained so far in different labs and present our studies on water jet interaction on oblique surfaces and the possible induced damages.

MOPP155	Superconducting RF Deflecting Cavity Design and Prototype for Short X-ray Pulse Generation	damping, simulation, coupling, dipole	913
	J. Shi, H. Chen, C.-X. Tang TUB, Beijing G. Cheng, G. Ciovati, P. Kneisel, R. A. Rimmer, G. Slack, L. Turlington, H. Wang Jefferson Lab, Newport News, Virginia D. Li LBNL, Berkeley, California A. Nassiri, G. J. Waldschmidt ANL, Argonne, Illinois
	Deflecting RF cavities are proposed to be used in generating short x-ray pulses (on ~1-picosecond order) at the Advanced Photon Source (APS) at Argonne National Laboratory (ANL)* using a novel scheme by Zholents*. To meet the required deflecting voltage, impedance budget from higher order, lower order and the same order modes (HOM, LOM and SOM) of the APS storage ring, extensive deflecting cavity design studies have been conducted with numerical simulations and cavity prototypes. In this paper, we report recent progress on a single cell S-band (2.8-GHz) superconducting deflecting cavity design with waveguide damping. A copper and a niobium prototype cavity were fabricated and tested, respectively to benchmark the cavity and damping designs. A new damping scheme has been proposed which provides stronger damping to both HOM and LOM by directly coupling to a damping waveguide on the cavity equator. A. Nassiri, private communication, 2007 ** A. Zholents et al. NIM, 1999, A425:385-389.

MOPP158	Conceptual Design of Automated Systems for SRF Cavity Optical Inspection and Assembly	radio-frequency, linear-collider, electron	922
	T. Tajima, A. Canabal, T. A. Harden, R. J. Roybal LANL, Los Alamos, New Mexico
	The International Linear Collider (ILC) will require ~16,000 Superconducting Radio-Frequency (SRF) cavities at an accelerating gradient of 31.5 MV/m. One of the critical issues that needs to be addressed is the insufficient yield of high-gradient cavities that meet the requirement. This paper describes the design and initial tests of a cavity inner surface optical inspection system. Combined with a full-featured 9-cell cavity temperature mapping system being developed at LANL, we hope to be able to correlate the cavity heating and the surface condition causing it.

MOPP168	Tests on the 1.3 GHz Low Loss Single-Cell RF Superconducting Large Grain Cavities of IHEP	linear-collider, cryogenics, linac, vacuum	943
	Z. G. Zong, J. Gao, M. Q. Ge, J. Gu, H. Sun, D. Wang, Q. J. Xu, J. Y. Zhai, F. C. Zhao IHEP Beijing, Beijing F. Furuta, T. Saeki, K. Saito KEK, Ibaraki L. Q. Liu Technical Institute of Physics and Chemistry, Beijing L.-Y. Xiong, L. Zhang, T. X. Zhao, Z. G. Zong TIPC, BeiJing
	To contribute to the International Linear Collider (ILC) R&D on the 1.3 GHz low loss cavities has been carried out at IHEP since 2005. Six cavities had been fabricated by the standard technology and treated by some procedures of surface treatments, such as centrifugal barrel polishing, barrel chemical polishing, annealing, high pressure rinsing and baking at in-house IHEP. Because of the shortage of liquid helium in Beijing two large grain cavities with a fine grain one were sent to KEK for vertical tests. The large grain cavities was tested and treated at KEk and finally both reached the accelerating gradients of more than 35 MV/m with the maximum of 40.27 MV/m. This paper presents the testing and results of the large grain cavities.

TUXG02	High Luminosity Operation, Beam-Beam Effects and Their Compensation in TEVATRON	proton, electron, antiproton, luminosity	951
	V. D. Shiltsev Fermilab, Batavia, Illinois
	During the recent years a remarkable increase of the TEVATRON luminosity was achieved. The presentation discusses the collider performance, how this was achieved and illustrates today's limitations. The TEVATRON will shutdown soon but many ideas that emerged from the TEVATRON are of great interest for future (hadron) colliders. As an example, the experience gained at the TEVATRON in understanding of beam-beam effects in hadron colliders and their compensation is highly relevant for future projects. Experimental results of the Tevatron Electron Lenses will be presented and possible use of similar lenses in LHC and RHIC will be discussed.
	Slides

TUOBG02	Study of Beam Dynamics During the Crossing of Resonances in the VEPP-4M Storage Ring	resonance, octupole, emittance, betatron	965
	P. A. Piminov, V. A. Kiselev, E. B. Levichev, O. I. Meshkov, S. A. Nikitin BINP SB RAS, Novosibirsk
	The influence of resonances on the beam dynamics in the storage rings is of a substantial interest for the accelerator physics. For example, a fast crossing of resonances occurs in the damping rings of future linear colliders during the beam damping due to the coherent shift that can result in a loss of particles. We have studied experimentally the crossing of resonances of different power nearby the working point of the VEPP-4M storage ring. The observation of the beam sizes and particle losses has been done with a single-turn time resolution. The comparison with the numerical simulation has been made.
	Slides

TUZM02	Overview of Fast Beam Position Feedback Systems	feedback, controls, electron, synchrotron	1021
	D. Bulfone ELETTRA, Basovizza, Trieste
	Modern circular and linear accelerators often rely on fast beam position feedbacks for the achievement of their design parameters. Such systems have gone through a significant evolution, which has taken advantage of recent progress of the associated equipment, like beam position monitors, as well as of the hardware and software processing technologies. A review of the latest developments and foreseen designs at different accelerators is given.
	Slides

TUOCM01	First Measurements of the Longitudinal Bunch Profile at SLAC Using Coherent Smith-Purcell Radiation at 28GeV	radiation, background, diagnostics, linear-collider	1026
	V. Blackmore, G. Doucas, B. Ottewell, C. Perry OXFORDphysics, Oxford, Oxon R. Arnold, S. Molloy, M. Woods SLAC, Menlo Park, California M. F. Kimmitt University of Essex, Physics Centre, Colchester
	Coherent Smith-Purcell radiation has been demonstrated as a technique for measuring the longitudinal profile of charged particles bunches in the low to intermediate energy range. However, with the advent of the International Linear Collider, the need has arisen for a non-invasive method of measuring the bunch profile at extremely high energies. Smith-Purcell radiation has been used for the first time in the multi-GeV regime to measure the longitudinal profile of the 28GeV SLAC beam. The experiment has both successfully determined the bunch length, and has also demonstrated its sensitivity to bunch profile changes. The challenges associated with this technique, and its prospects as a diagnostic tool are reported here.
	Slides

TUPC024	Video Profile Monitors Development for the CTF3 Probe Beam Linac	linac, laser, diagnostics, emittance	1101
	W. Farabolini, G. Adroit, P. Girardot, R. Granelli, F. Harrault, C. L.H. Lahonde-Hamdoun, T. Lerch, F. Orsini CEA, Gif-sur-Yvette
	The innovative CLIC concept is currently under study in the CLIC Test Facility (CTF3) at CERN where the acceleration of a probe beam will be demonstrated. This probe beam, delivered by a linac called CALIFES, is composed of short bunches (0.75 ps, 0.6 nC) at 170 MeV with normalized emittance lower than 20 mm.mrad. Measurements of longitudinal charges distribution, transverse emittance and energy spectrum rely on Video Profile Monitors (VPM) after appropriate manipulations of the beam (deflecting cavity, quad scan and analysis dipole). We report the design, development and tests of these new VPMs based on selectable YAG/OTR screens, optical line and CCD camera. Two selectable magnifications (1.75 and 0.33) are available via motorized lens mounts to comply both with resolution (20 μm) and field of view (10x10mm²). Study of optical line characteristics have been realised with Apilux software and Modulation Transfer Function (MTF) were measured. A grid pattern can be inserted at the screens position to check optical characteristics during operations. Tilt of the CCD plan in order to compensate the screen tilt of 15° has not proven to improve the depth of field and was not implemented.

TUPC067	Development of the Methods of Beam Energy Spread Determination in the VEPP-4M Collider	diagnostics, photon, simulation, electron	1209
	O. I. Meshkov, V. A. Kiselev, N. Yu. Muchnoi, S. V. Sinyatkin, V. V. Smaluk, V. N. Zhilich, A. N. Zhuravlev BINP SB RAS, Novosibirsk
	The nearest experimental program of the VEPP-4M electron-positron collider and the KEDR detector includes a scan of the energy area below J/psi meson to search narrow resonances. The monitoring of beam energy spread is important for that. In this report we discuss the application of several diagnostics for beam energy spread measurement. The data obtained with Compton Back-Scattering (CBS) technique are compared with the value of the spread derived from the betatron motion of the beam. Similar experiments were carried out before. They demonstrated the necessity to improve the algorithm of beam energy spread derivation using CBS technique. New set of experiments was aimed on the examination of the improved algorithm. The measurements by all the methods were done at the same accelerator run, i.e., the different diagnostics are compared directly. The value of the energy spread was determined for a fixed collider energy E= 1855 MeV. The beam energy spread was changed by the wiggler current variation.

TUPC115	Vibration Stabilization for a Cantilever Magnet Prototype at the Subnanometer Scale	controls, linear-collider, ground-motion, instrumentation	1335
	L. Brunetti, B. Bolzon, N. Geffroy, A. Jeremie IN2P3-LAPP, Annecy-le-Vieux A. Badel, B. Caron, J. Lottin SYMME, Annecy-le-Vieux
	In the future linear colliders, the size of the beams is in the nanometer range, which requires stabilization of the final magnets before the interaction point. In order to guarantee the desired luminosity, an absolute displacement lower than 1/3 of the beam size, above a few hertz, has to be obtained. This paper describes an adapted instrumentation, the developed feedback loops dedicated to the active compensation and an adapted modelling able to simulate the behaviour of the structure. The obtained results at the subnanometer scale at the free end of a cantilever magnet prototype with a combination of the developed active compensation method and a commercial active isolation system are described.

TUPC118	First Data from the Linear Collider Alignment and Survey Project (LiCAS)	survey, laser, alignment, linear-collider	1344
	A. Reichold, T. Handford, L. A. Rainbow, M. Tacon, C. Uribe Estrada, D. Urner, S. Q. Yang OXFORDphysics, Oxford, Oxon P. J. Brockill, S. Cohen, J. Dale, M. Dawson, M. Jones, G. Moss, R. Wastie JAI, Oxford G. Grzelak Warsaw University, Warsaw J. Prenting, M. Schloesser DESY, Hamburg
	The LiCAS project has developed a prototype robotic survey system for rapid and highly accurate surveying of long linear accelerator tunnel networks. It is aimed at the survey of the reference network for the International Linear Collider (ILC). This Rapid Tunnel Reference Surveyor (RTRS) is designed to be an R\&D instrument for evaluating the potential performance of the RTRS concept and its survey technology. The prototype has been commissioned in a test tunnel at DESY with initial calibrations and measurements ongoing. We will report on the results obtained so far and present conclusions for the design of an RTRS suitable for the ILC.

TUPC124	Development of a High Power Fibre Laser for Laser Based Electron Beam Diagnostics	laser, linear-collider, electron, scattering	1359
	L. Corner, N. Delerue, M. Newman, R. Walczak OXFORDphysics, Oxford, Oxon G. A. Blair, S. T. Boogert Royal Holloway, University of London, Surrey L. Corner, D. F. Howell, L. J. Nevay JAI, Oxford
	We present the latest results on the development of a high power fibre laser system for the laserwire project on ILC-like laser based electron beam diagnostics. The laser consists of a solid state oscillator which can be synchronised to an external frequency reference, and two amplification stages in double clad doped fibre, giving 1uJ pulses in a burst mode suitable for the ATF2 laserwire project. This output is amplified in large mode area photonic crystal fibre to generate the high pulse energy necessary for Compton scattering without any deleterious nonlinear effects, whilst maintaining the high spatial mode quality and beam pointing stability of a fibre laser. These properties are essential for producing the sub-micron spot sizes required for the measurement of small particle beam sizes.

TUPC130	Integration of CATIA/SMARTEAM into CERN's Corporate Engineering Data Management System	controls, hadron, site	1374
	T. Hakulinen, C. Delamare, P.-O. Friman, T. Pettersson, E. Van Uytvinck, D. Widegren CERN, Geneva G. Fournier SPI Numérique, Lyon
	The document presents a short overview of the strategy defined to integrate the 3D CAD system CATIA/Smarteam into CERN’s corporate Engineering and Equipment Data Management System (EDMS). EDMS is used to manage the information about the Laboratory’s installations and technical infrastructure. A brief description of the existing EDMS architecture is given, describing the project life cycle management features available. The integration of CATIA/Smarteam into this backbone will offer the Organization an EDMS which can handle all technical information about a facility from its inception to its dismantling seamlessly. An overview of the Design Office requirements on the new CAD system is also presented.

TUPD008	Marx Bank Technology for Accelerators and Colliders	controls, impedance, diagnostics, linear-collider	1449
	J. A. Casey, F. O. Arntz, M. P.J. Gaudreau, M. K. Kempkes, I. Roth Diversified Technologies, Inc., Bedford, Massachusetts
	Diversified Technologies, Inc. (DTI) has developed high power, solid-state Marx Bank designs for a range of accelerator and collider designs. We estimate the Marx topology can deliver equivalent performance to conventional designs, while reducing acquisition costs by 25-50%. In this paper DTI will describe the application of Marx based technology to two different designs: a long-pulse ILC focused design (140 kV, 160 A, 1.5 ms), and a short-pulse design (500 kV, 265 A, 3 us). These designs span the known requirements for future accelerator modulators. For the ILC design, the primary challenge is minimizing the overall size and cost of the storage capacitors in the modulator. For the short-pulse design, the primary challenge is high speed operation, to limit the energy lost in the pulse rise-time while providing a very tight (± 3%) voltage flattop. Each design demands unique choices in components and controls, including the use of electrolytic capacitors in the ILC Marx design. This paper will review recent progress in the development and testing of both of these prototype Marx designs, being built under two separate DOE Phase II SBIR grants.

TUPD033	Fabrication of Crystals for Channelling of Particles in Accelerators	proton, hadron, collimation, background	1497
	A. Mazzolari, S. Baricordi, V. Guidi, G. Martinelli, D. Vincenzi UNIFE, Ferrara
	Channelling in bent crystals is used for beam extraction, focusing, collimation in accelerators machines, studies related to emission of coherent electromagnetic radiation and other topics. Distinctive features of performance increase is the availability of new techniques to manufacture the crystals within which channeling takes place. We propose a method to fabricate crystals through micromachining techniques, i.e., photolithography and anisotropic chemical etching. Patterning of a Si wafer with silicon nitride allows selective erosion of uncovered areas along specific atomic planes, resulting in a technique to dice Si wafers to the needed dimensions solely through chemical methods. Thus, it results in no damage to the crystal quality due to the dicing process. As was demonstrated by electron microscopy investigation, the crystal exhibits ultra flat lateral surfaces and simultaneously no amorphous layer at the entry face of the crystal with respect to the beam. The crystals were positively tested at the external line H8 of the SPS with 400 GeV protons for investigation on axial channeling and on single and multiple volume reflection experiments by the H8-RD22 collaboration.

TUPD038	Beam Test of a Movable Collimator (Mask) with Low Beam Impedance	impedance, positron, vacuum, simulation	1511
	Y. Suetsugu, K. Shibata KEK, Ibaraki A. Morishige, Y. Suzuki, M. Tsuchiya Kinzoku Giken Co. Ltd., Ebina
	A movable collimator with low beam impedance for future high-intensity machines has been investigated in KEK. The metal head of the collimator is supported by a dielectric material in order to reduce the interference with beams. The first test model was installed into the KEK B-factory (KEKB) positron ring last year. The head and the support was alumina ceramic, but only the head was coated by copper to realize a conductive layer. The support, however, was finally melted during the beam operation due to the overheating by intense electromagnetic fields induced by bunches. Based on the experience, the design was revised and the second test model was manufactured, where the head and the support were made of graphite and artificial diamond, respectively. Graphite is a conductive material with high thermal strength, and diamond, on the other hand, is a dielectric material with high thermal conductivity as well as the strength. The second test model is installed in the spring of this year, and tested again with beams during the beam operation to prove the principle. The results of the beam tests will be presented here. Y. Suetsugu, K. Shibata, A. Morishige, Y. Suzuki, M. Tsuchiya, “Design Study of a Movable Mask with Low Bema Impedance”, PRST-AB, 9, 2006, 103501.

TUPP019	Wakefield and RF Kicks due to Coupler Asymmetry in TESLA-type Accelerating Cavities	emittance, linac, impedance, coupling	1571
	K. L.F. Bane, C. Adolphsen, Z. Li SLAC, Menlo Park, California M. Dohlus, I. Zagorodnov DESY, Hamburg E. Gjonaj, T. Weiland TEMF, Darmstadt I. G. Gonin, A. Lunin, N. Solyak, V. P. Yakovlev Fermilab, Batavia, Illinois
	In a future linear collider, such as the International Linear Collider (ILC), trains of high current, low emittance bunches will be accelerated in a linac before colliding at the interaction point. Asymmetries in the accelerating cavities of the linac will generate asymmetries in the fields that will kick the beam and tend to degrade the beam emittance and thus the collider performance. In the main linac of the ILC, which is filled with TESLA-type superconducting cavities, it is the fundamental and higher mode couplers that are asymmetric and thus the source of such kicks. The kicks are of two types: one, due to (the asymmetries in) the fundamental RF fields and the other, due to transverse wakefields that are generated even when the beam is on axis. For the ILC configuration we numerically and analytically study both types of kicks and their effect on beam emittance. For the wakefield effect this is quite challenging since the bunches are very short (rms length of 300 microns), the cavity is very long (~1 m), and the distance to steady-state is even longer (~6 m). Finally, we study changes in the coupler design that can greatly reduce the effect.

TUPP095	Computation of Resistive Wall Wakefields with the PBCI Code	simulation, impedance, resonance, linear-collider	1753
	T. Lau, E. Gjonaj, T. Weiland TEMF, Darmstadt R. Maekinen TUT, Tampere
	Both geometric disturbances and resistive wall loss of accelerator cavities contribute to the impedance causing the beam to lose energy. Impedance due to arbitrary three-dimensional (3-D) geometries can be computed with the Parallel Beam Cavity Interaction (PBCI), a parallelized, 3D-wakefield code. However, the contribution of wall loss is often significant. The contribution of this work is to incorporate resistive wall loss into 3-D time-domain simulation. Surface-impedance concept is used to consider wide-band skin-effect loss of metal. In theory, the proposed approach can be extended to consider high-frequency phenomena such as frequency-dependent conductivity of metal and anomalous skin effect.

WEXG01	Performance of KEKB with Crab Cavities	luminosity, simulation, resonance, coupling	1893
	Y. Funakoshi KEK, Ibaraki
	20 years after they were initially proposed, in February 2007 crab cavities are for the first time installed in an operating collider, KEKB. The commissioning of KEKB with crab cavities is presented, and the performance of the collider is compared to the performance without crab cavities. Lessons learned from the operation with such cavities for future projects are discussed.
	Slides

WEXG02	Crabbed Waist Collisions in DAΦNE and Super-B Design	luminosity, injection, emittance, interaction-region	1898
	P. Raimondi, D. Alesini, M. E. Biagini, C. Biscari, R. Boni, M. Boscolo, F. Bossi, B. Buonomo, A. Clozza, G. O. Delle Monache, T. Demma, E. Di Pasquale, G. Di Pirro, A. Drago, A. Gallo, A. Ghigo, S. Guiducci, C. Ligi, F. Marcellini, G. Mazzitelli, C. Milardi, F. Murtas, L. Pellegrino, M. A. Preger, L. Quintieri, R. Ricci, U. Rotundo, C. Sanelli, M. Serio, F. Sgamma, B. Spataro, A. Stecchi, A. Stella, S. Tomassini, C. Vaccarezza, M. Zobov INFN/LNF, Frascati (Roma) N. Arnaud, D. Breton, P. Roudeau, A. Stocchi, V. Variola, B. F. Viaud LAL, Orsay S. Bettoni CERN, Geneva P. Branchini roma3, Rome M. Esposito Rome University La Sapienza, Roma I. Koop, E. B. Levichev, P. A. Piminov, D. N. Shatilov, V. V. Smaluk BINP SB RAS, Novosibirsk K. Ohmi KEK, Ibaraki E. Paoloni University of Pisa and INFN, Pisa M. Schioppa INFN Gruppo di Cosenza, Arcavacata di Rende (Cosenza) D. Teytelman SLAC, Menlo Park, California P. Valente INFN-Roma, Roma
	The new idea of increasing the luminosity of a collider with crabbed waist collisions and first experimental results from DAΦNE using this concept are presented. Consequences for the design of future factories will be discussed. An outlook to the performance reach with crabbed waist collisions is given, with emphasis on future B Factories.
	Slides

WEOAG01	Prospects for a Large Hadron Electron Collider (LHeC) at the LHC	hadron, luminosity, ion, lepton	1903
	M. Klein Liverpool University, Science Faculty, Liverpool H. Aksakal N. U, Nigde F. Bordry, H.-H. Braun, O. S. Brüning, H. Burkhardt, R. Garoby, J. M. Jowett, T. P.R. Linnecar, K. H. Mess, J. A. Osborne, L. Rinolfi, D. Schulte, R. Tomas, J. Tuckmantel, F. Zimmermann, A. de Roeck CERN, Geneva S. Chattopadhyay, J. B. Dainton Cockcroft Institute, Warrington, Cheshire A. K. Ciftci Ankara University, Faculty of Sciences, Tandogan/Ankara A. Eide EPFL, Lausanne B. J. Holzer DESY, Hamburg P. Newman Birmingham University, Birmingham E. Perez CEA, Gif-sur-Yvette S. Sultansoy TOBB ETU, Ankara A. Vivoli LAL, Orsay F. J. Willeke BNL, Upton, New York
	The LHeC collides a lepton beam with one of the intense, LHC, hadron beams. It achieves both e± interactions with quarks at the terascale, at eq masses in excess of 1 TeV, with a luminosity of about 10³³ cm^-2 s^-1, and it also enables a sub-femtoscopic probe of hadronic matter at unprecedented chromodynamic energy density, at Bjorken-x values down to 10^-6 in the deep inelastic scattering domain. The LHeC combines the LHC infrastructure with recent advances in radio-frequency, in linear acceleration and in other associated technologies, to enable two proposals for TeV ep collisions: a "ring-ring" option in which 7 TeV protons (and ions) collide with about 70 GeV electrons/positrons in a storage ring in the LHC tunnel and a "linac-ring" option based on an independent superconducting linear accelerator enabling single-pass collisions of electrons and positrons of up to about 140 GeV with an LHC hadron beam. Both options will be presented and compared. Steps are outlined for completing a Conceptual Design Review of the accelerator complex, beam delivery, luminosity, physics and implications for experiment, following declared support by ECFA and by CERN for a CDR.
	Slides

WEIM03	Industrialization of Superconducting Accelerator Module Production	vacuum, linac, alignment, free-electron-laser	1964
	B. Petersen DESY, Hamburg
	As part of the EUROFEL Design Study, two industrial partners recently took part in the assembly of superconducting TESLA modules for FLASH. The aim was to transfer the module assembly knowledge to industry and to analyse the assembly sequence to perpare for industrial production for future projects such as the XFEL. This talk should discuss the conclusions of this study and identify issues that must be considered when transferring SRF technology to industry.
	Slides

WEPD001	The Quality Control of the LHC Continuous Cryostat Interconnections	controls, vacuum, monitoring, induction	2398
	F. F. Bertinelli, D. Bozzini, P. Cruikshank, P. Fessia, W. Maan, A. Poncet, S. Russenschuck, F. Savary, Z. Sulek, J.-P. G. Tock, D. Tommasini, L. R. Williams CERN, Geneva P. B. Borowiec, A. Kotarba, S. Olek HNINP, Kraków A. Grimaud ALL43, Saint-Genis-Pouilly L. Vaudaux IEG, St-Genis-Pouilly
	The interconnections between the Large Hadron Collider (LHC) magnets have required some 40 000 TIG welded joints and 65 000 electrical splices. At the level of single joints and splices, non-destructive techniques find limited application: quality control is based on the qualification of the process and of operators, on the recording of production parameters, and on production samples. Visual inspection and process audits were the main techniques used. At the level of an extended chain of joints and splices - from a 53.5 m half-cell to a complete 2.7 km sector - quality control is based on vacuum leak tests, electrical tests and RF microwave reflectometry that progressively validated the work performed. Subsequent sector pressure tests, cryogenic circuits flushing with high pressure helium and cool-downs revealed a few unseen or new defects. The nature of defects is analyzed and classified according to their origin. Methods for defect localization are described. This paper presents an overview of the quality control techniques used and critically evaluates their effectiveness in progressively identifying defects, seeking lessons applicable to similar large, complex projects.

WEPD003	Manufacture and Test of a Small Ceramic-insulated Nb3Sn Split Solenoid	damping, vacuum, linear-collider, undulator	2404
	B. Bordini, R. Maccaferri, L. Rossi, D. Tommasini CERN, Geneva
	A small split solenoid wound with high Jc Nb3Sn conductor, constituted by a 0.8 mm Rod Re-stack Process (RRP) strand, was built and tested at CERN in order to study the applicability of: ceramic wet glass braid insulation without epoxy impregnation of the magnet; a new heat treatment devised at CERN and particularly suitable for reacting RRP Nb3Sn strands. This paper briefly describes the solenoid and the experimental results obtained during 4.4 K and 1.9 K tests. The split solenoid consists of two coils (25 mm inner diameter, 51.1 mm outer diameter, 12.9 mm height). The coils were initially separately tested, in an iron mirror configuration, and then tested together in split solenoid configuration. In all the tests at 4.4 K the coils reached a current higher than 97% of their short sample limits at the first quench; in split solenoid configuration the maximum field in the coils and in the aperture were respectively 10.7 T and 12.5 T. At 1.9 K the coils had premature quenches due to self field instability despite the rather high RRR of the two coils (190 and 270). This phenomenon at 1.9 K, expected by our theory* and also confirmed by strand measurements, is discussed. *B. Bordini, E. Barzi, S. Feher, L. Rossi, and A. V. Zlobin. "Self-Field Effects in Magneto-Thermal Instabilities for Nb-Sn Strands," to be published in IEEE Trans. Appl. Supercond. 2008.

WEPD005	Scaling Laws for Magnetic Energy in Superconducting Quadrupoles	quadrupole, superconducting-magnet, luminosity, positron	2407
	F. Borgnolutti, E. Todesco CERN, Geneva A. Mailfert ENSEM, Vandoeuvre lès Nancy
	The stored energy in superconducting magnets is one of the main ingredients needed for the quench calculation and for desingin quench protections. Here we proposed an analytical formula based on the Fourier transformation of the current density flowing within the winding to determine the magnetic energy stored in superconducting quadrupoles made of sector coils. Two corrective coefficients allowing to estimate the energy enhancement produced either by current grading or by the presence of an unsaturated iron yoke are respectively derived from a numerical and an analytical study. This approach is applied to a set of real quadrupoles to test the validity limits of the scaling law, which are shown to be of 5-10%.

WEPD022	High Field Superconductor for Muon Cooling	superconducting-magnet, beam-cooling, emittance, magnet-design	2455
	J. Schwartz NHMFL, Tallahassee, Florida R. P. Johnson, S. A. Kahn, M. Kuchnir Muons, Inc, Batavia
	High temperature superconductors (HTS) have been shown to carry significant current density in the presence of extremely high magnetic fields when operated at low temperature. The successful design of magnets needed for high energy physics applications using such high field superconductor (HFS) depends critically on the detailed wire or tape parameters which are still under development and not yet well-defined. In the project reported here, we are developing HFS for accelerator use by concentrating on the design of an innovative magnet that will have a useful role in muon beam cooling. Measurements of available materials and a conceptual design of a high field solenoid using YBCO HFS conductor are being analyzed with the goal of providing useful guidance to superconductor manufacturers for materials well suited to accelerator applications.

WEPD027	A new cable insulation scheme improving heat transfer in Nb-Ti superconducting accelerator magnets	superconducting-magnet, dipole, quadrupole, interaction-region	2467
	D. Tommasini, D. Richter CERN, Geneva
	The next applications of superconducting magnets for interaction regions of particle colliders or for fast cycled accelerators require dealing with large heat fluxes generated or deposited in the coils. Last year* we have anticipated the theoretical potential for a large improvement of heat transfer of state of the art Nb-Ti cable insulations in superfluid helium, such as the one used for the LHC superconducting magnets. In this paper we present and discuss new experimental results, confirming that a factor of 5 increase of the allowed heat flux from coil to coolant can be obtained with the new insulation topology while keeping a sound margin in the dielectric performance. *M. La China, D. Tommasini. “Cable Insulation Scheme to Improve Heat Transfer to Superfluid Helium in Nb-Ti Accelerator Magnets,” MT-20, Philadelphia, USA, August 2007.

WEPD043	Orbital Welding of QRL Line in Confined Environment	cryogenics, vacuum, controls, alignment	2509
	E. P. Roussel Air Liquide, Sassenage P. J.D. P. Mazoyer ORBITAL, Vonnas
	AIR LIQUIDE DTA was in charge of design, manufacturing of element and installation of QRL line of CERN. The elements of this cryogenic line have been welded by orbital welding with an open weld head. A specific welding head has been developed for the project. Radial and axial clearances lead the design of the head. To install this cryogenic line, more than 15 000 orbital welds have been realized. This paper will present the technical requirements applicable to QRL line, different welding configuration, main step to qualify welding process. We will describe the results of non destructive examination: helium leak test, X-ray inspection and visual inspection.

WEPD045	Hydrogen Cryosorption on Multi Walled Carbon Nanotubes	vacuum, cryogenics, background, synchrotron	2515
	F. Xu, M. Barberio, P. Barone, A. Oliva, L. Papagno, V. Pirronello, R. Vasta INFN Gruppo di Cosenza, Arcavacata di Rende (Cosenza)
	We present a Temperature Programmed Desorption (TPD) study on H₂ adsorption on multiwalled carbon nanotubes (MWNT) at very low pressure (< 10^-6 Torr) and temperature (12-30 K). Our results show a hydrogen take up limit in the range of 10^-8 mol per gram depending on the adsorption temperature. We compare the MWNT cryosorption capacity with that of commonly used activated carbon and discuss the possibility of employing MWNT as cryosorber in large particle accelerators.

WEPP016	FEL-based Coherent Electron Cooling for High-energy Hadron Colliders	hadron, electron, emittance, luminosity	2560
	V. Litvinenko BNL, Upton, Long Island, New York Y. S. Derbenev Jefferson Lab, Newport News, Virginia
	Cooling intense high-energy hadron beams remains a major challenge in modern accelerator physics. Synchrotron radiation of such beams is too feeble and two common methods, stochastic and electron cooling, are not efficient in providing significant cooling for high energy hadron, especially proton, colliders. In this paper we discuss a practical scheme of Coherent Electron Cooling, which promises short cooling times (below one hour) for intense proton beams in RHIC at 250 GeV or in LHC at 7 TeV. Coherent Electron Cooling was suggested early 1980s as a possibility for using various microwave instabilities in an electron beam to enhance its interaction with hadrons. The capabilities of present-day accelerator technology, ERLs, and high-gain Free-Electron Lasers (FELs), finally caught up with the idea and provided the all necessary ingredients for realizing such a process at energies typical for modern high energy hadron colliders. In this paper, we discuss the principles, the main limitations of this scheme and present some predictions for Coherent Electron Cooling in RHIC and the LHC operating with ions or protons. V. N. Litvinenko, Y. S. Derbenev, Proc. 29th Int. FEL Conference, Novosibirsk, August, 2007. **Y. S. Derbenev, Proc. of 7th All-Union Conf. on Charged Particle Accelerators, October 1980, Dubna, 269.

WEPP019	RHIC Polarized Proton Performance in Run-8	luminosity, proton, polarization, emittance	2566
	C. Montag, N. P. Abreu, L. Ahrens, M. Bai, D. S. Barton, A. Bazilevsky, J. Beebe-Wang, M. Blaskiewicz, J. M. Brennan, K. A. Brown, D. Bruno, G. Bunce, R. Calaga, P. Cameron, R. Connolly, T. D'Ottavio, K. A. Drees, A. V. Fedotov, W. Fischer, G. Ganetis, C. J. Gardner, J. W. Glenn, T. Hayes, H. Huang, P. F. Ingrassia, A. Kayran, J. Kewisch, R. C. Lee, V. Litvinenko, A. U. Luccio, Y. Luo, W. W. MacKay, Y. Makdisi, N. Malitsky, G. J. Marr, A. Marusic, R. J. Michnoff, J. Morris, B. Oerter, H. Okada, F. C. Pilat, P. H. Pile, G. Robert-Demolaize, T. Roser, T. Russo, T. Satogata, C. Schultheiss, M. Sivertz, K. Smith, S. Tepikian, D. Trbojevic, N. Tsoupas, J. E. Tuozzolo, A. Zaltsman, A. Zelenski, K. Zeno, S. Y. Zhang BNL, Upton, Long Island, New York
	During Run-8, the Relativistic Heavy Ion Collider (RHIC) provided collisions of spin-polarized proton beams at two interaction regions. Helical spin rotators at these two interaction regions were used to control the spin orientation of both beams at the collision points. Physics data were taken with different orientations of the beam polarization. We present recent developments and improvements as well as the luminosity and polarization performance achieved during Run-8.

WEPP029	Project of the Nuclotron-based Ion Collider Facility (NICA) at JINR	ion, luminosity, electron, heavy-ion	2581
	G. V. Trubnikov, N. N. Agapov, V. Alexandrov, A. V. Butenko, E. E. Donets, A. V. Eliseev, A. Govorov, V. Kekelidze, H. G. Khodzhibagiyan, V. Kobets, A. D. Kovalenko, O. S. Kozlov, A. Kuznetsov, I. N. Meshkov, V. A. Mikhaylov, V. Monchinsky, V. Shevtsov, A. O. Sidorin, A. N. Sissakian, A. V. Smirnov, A. Sorin, V. Toneev, V. Volkov, V. Zhabitsky JINR, Dubna, Moscow Region O. I. Brovko, I. Issinsky JINR/LHE, Moscow
	The Nuclotron-based Ion Collider fAcility (NICA) is the new accelerator complex being constructed at JINR aimed to provide collider experiments with heavy ions up to uranium at maximum energy (center of mass) equal to 9 GeV/u. It includes new 6 Mev/u linac, 440 MeV/u booster, upgraded SC synchrotron Nuclotron and collider consisting of two SC rings, which provide average luminosity of 10²⁷cm^-2s^-1. General goal of the project is to start in the coming 5-7 years experimental study of hot and dense strongly interacting QCD matter and search for possible manifestation of signs of the mixed phase and critical endpoint in heavy ion collisions. The NICA and the Multi Purpose Detector (MPD) are proposed for these purposes. Accelerator complex NICA is being built on the experience and technological developments at the Nuclotron facility and incorporates new technological concepts. The new facility will allow also an effective acceleration of light ions to the Nuclotron maximum energy and an increase of intensity of polarized deuteron beams up to the level above 10¹⁰ particles/cycle. The scheme of the facility, its operation scenario and beam dynamics are presented in the report.

WEPP036	DAΦNE Setup and Operation with the Crab-Waist Collision Scheme	luminosity, sextupole, injection, vacuum	2599
	C. Milardi, D. Alesini, M. E. Biagini, C. Biscari, R. Boni, M. Boscolo, F. Bossi, B. Buonomo, A. Clozza, G. O. Delle Monache, T. Demma, E. Di Pasquale, G. Di Pirro, A. Drago, A. Gallo, A. Ghigo, S. Guiducci, C. Ligi, F. Marcellini, G. Mazzitelli, F. Murtas, L. Pellegrino, M. A. Preger, L. Quintieri, P. Raimondi, R. Ricci, U. Rotundo, C. Sanelli, M. Serio, F. Sgamma, B. Spataro, A. Stecchi, A. Stella, S. Tomassini, C. Vaccarezza, M. Zobov INFN/LNF, Frascati (Roma) N. Arnaud, D. Breton, P. Roudeau, A. Stocchi, V. Variola, B. F. Viaud LAL, Orsay S. Bettoni CERN, Geneva P. Branchini roma3, Rome M. Esposito Rome University La Sapienza, Roma I. Koop, E. B. Levichev, P. A. Piminov, D. N. Shatilov BINP SB RAS, Novosibirsk K. Ohmi KEK, Ibaraki E. Paoloni University of Pisa and INFN, Pisa M. Schioppa INFN Gruppo di Cosenza, Arcavacata di Rende (Cosenza) V. V. Smaluk BINP, Novosibirsk P. Valente INFN-Roma, Roma
	In the second half of 2007 a major upgrade has been implemented on the Frascati DAΦNE collider in order to test the novel idea of Crab Waist collisions. New vacuum chambers and permanent quadrupole magnets have been designed, fabricated and installed to realize the new configuration. At the same time the performances of relevant hardware components, such as fast injection kickers and shielded bellows have been improved relying on new design concepts. The collider has been successfully commissioned in this new configuration. The paper describes the new layout as well as several experimental results about linear and non-linear optics setup and optimization, damping of beam instabilities and discusses the obtained luminosity performances.

WEPP037	Independent Component Analysis of Tevatron Turn-by-turn BPM Measurements	betatron, synchrotron, optics, extraction	2602
	A. V. Petrenko BINP SB RAS, Novosibirsk V. A. Lebedev, A. Valishev Fermilab, Batavia, Illinois
	Transverse dipole coherent beam oscillations in the Tevatron were analyzed with different independent component analysis algorithms. This allowed to obtain the model-independent values of coupled beta-functions as well as betatron phase advance and dispersion along the ring from a single kick measurement. Using a 1-turn shift of turn-by-turn BPM readings for virtual doubling of the number of BPMs it is also possible to measure the fractional part of betatron tunes with high accuracy. Good agreement with the linear optical model of the Tevatron was observed.

WEPP039	Design of a 10³⁶ cm^-2 s^-1 Super-B Factory	interaction-region, luminosity, injection, emittance	2605
	J. Seeman, K. J. Bertsche, A. Novokhatski, M. K. Sullivan, U. Wienands, W. Wittmer SLAC, Menlo Park, California S. Bettoni CERN, Geneva M. E. Biagini, R. Boni, M. Boscolo, T. Demma, A. Drago, S. Guiducci, P. Raimondi, S. Tomassini, M. Zobov INFN/LNF, Frascati (Roma) A. Bogomyagkov, I. Koop, E. B. Levichev, S. A. Nikitin, P. A. Piminov, D. N. Shatilov BINP SB RAS, Novosibirsk G. Marchiori INFN-Pisa, Pisa E. Paoloni University of Pisa and INFN, Pisa
	Submitted for the High Luminosity Study Group for an Asymmetric Super-B-Factory: Parameters are being studied for a high luminosity e⁺e^- collider operating at the Upsilon 4S that would deliver a luminosity of 1 to 2 x 10³⁶/cm²/s. This collider would use a novel combination of linear collider and storage ring techniques. In this scheme an electron beam and a positron beam are stored in low-emittance damping rings similar to those designed for a Linear Collider (LC) or the next generation light source. A LC style interaction region is included in the ring to produce sub-millimeter vertical beta functions at the collision point. A large crossing angle (±25 mrad) is used at the collision point to allow beam separation. A crab-waist scheme is used to reduce the hourglass effect and restore peak luminosity. Beam currents of about 1.8 A in 1400 bunches can produce a luminosity of 10³⁶/cm²/s with upgrade possibilities. Design parameters and beam dynamics effects are discussed.

WEPP045	Suppression of Beam-beam Resonances in Crab Waist Collisions	luminosity, sextupole, resonance, betatron	2620
	M. Zobov, P. Raimondi INFN/LNF, Frascati (Roma) D. N. Shatilov BINP SB RAS, Novosibirsk
	The recently proposed Crab Waist scheme of beam-beam collisions can substantially increase the collider luminosity since it combines several potentially advantageous ideas. One of the basic ingredients of the scheme is the use of dedicated sextupoles in the interaction region for the vertical beta function waist rotation at the interaction point. In this paper we show how this nonlinear focusing helps to suppress betatron and synchrobetatron resonances arising in beam-beam collisions due to particles’ vertical motion modulation by their horizontal oscillations.

WEPP046	Final Focus for the Crab-waist Tau-charm Factory	quadrupole, luminosity, factory, interaction-region	2623
	I. N. Okunev BINP, Novosibirsk A. Bogomyagkov, E. B. Levichev, P. A. Piminov, S. V. Sinyatkin, P. Vobly BINP SB RAS, Novosibirsk
	In the crab-waist colliders design of the final focus region is a matter of primary importance. The paper describes analysis of final focus quadrupole design and results of particles tracking through the quadrupoles.

WEPP049	Advances on ELIC Design Studies	electron, ion, optics, luminosity	2632
	S. A. Bogacz, P. Chevtsov, Y. S. Derbenev, P. Evtushenko, M. Hutton, G. A. Krafft, R. Li, L. Merminga, J. Musson, B. C. Yunn, Y. Zhang Jefferson Lab, Newport News, Virginia J. Qiang LBNL, Berkeley, California H. K. Sayed Old Dominion University, Norfolk, Virginia
	An electron-ion collider of a center-of-mass energy up to 90 GeV at luminosity up to 10³⁵ cm^-2s^-1 with both beams highly polarized is essential for exploring the new QCD frontier of strong color fields in nuclear and precisely imaging the sea-quarks and gluons in the nucleon. A conceptual design of a ring-ring collider based on CEBAF (ELIC) with energies up to 9 GeV for electrons/positrons and up to 225 GeV for protons and 100 GeV/u for ions has been proposed to fulfill the science desire and to serve as the next step for CEBAF after the planned 12 GeV energy upgrade of the fixed target program. Here, we summarize recent design progress for the ELIC complex with four interaction points (IP); including interaction region optics with chromatic aberration compensation scheme and complete lattices for the Figure-8 collider rings. Further optimization of crab crossing angles at the IPs, simulations of beam-beam interactions and electron polarization in the Figure-8 ring and its matching at the IPs are also discussed.

WEPP051	QCD Explorer Based eA and γA Colliders	ion, luminosity, electron, linac	2635
	H. Karadeniz Turkish Atomic Energy Authority, Ankara E. Recepoglu SNRTC, Ankara S. Sultansoy TOBB ETU, Ankara
	TeV scale lepton-hadron and photon-hadron colliders are necessary both to clarify fundamental aspects of strong interactions and for adequate interpretation of the LHC data. Today, there are two realistic proposals for the post-HERA era, namely, QCD Explorer (QCD-E) and Large Hadron electron Collider (LHeC). Both QCD-E and LHeC can operate as eA colliders, whereas γp and γA options are unique for QCD-E. Another advantage of QCD-E is the possibility to increase the center of mass energy by lengthening of electron linac. In this presentation main parameters of the QCD-E nucleus options are discussed.

WEPP084	Fabrication of a Quadrant-type Accelerator Structure for CLIC	linear-collider, feedback, acceleration, background	2716
	T. Higo, Y. Higashi, H. Kawamata, T. T. Takatomi, K. Ueno, Y. Watanabe, K. Yokoyama KEK, Ibaraki A. Grudiev, G. Riddone, M. Taborelli, W. Wuensch, R. Zennaro CERN, Geneva
	In order to heavily damp the higher order modes of an accelerator structure for CLIC, two kind of damping mechanisms are implemented in one of the designs. Here each cell is equipped with electrically coupled damping channels in addition to the magnetically coupled waveguides. This design requires an assembly of longitudinally cut four quadrants to form a structure and the parts are necessarily made with milling. Since KEK has developed a high-precision machining of X-band accelerator cells with milling and turning at the same time, the experience was extended to the milling of this quadrant. Firstly, the fabrication test of a short quadrant was performed with multiple vendors to taste the present-day engineering level of milling. Following this, a full-size quadrant is also made. In this course, some of the key features are addressed, such as flatness of the reference mating surfaces, alignment grooves, 3D profile shape of the cells, surface roughness and edge treatment. In this paper, these issues are discussed from both fabrication and evaluation point of views.

WEPP096	Nextef: The 100MW X-band Test Facility in KEK	klystron, linear-collider, controls, linac	2740
	S. Matsumoto, M. Akemoto, S. Fukuda, T. Higo, N. Kudoh, H. Matsushita, H. Nakajima, T. Shidara, K. Yokoyama, M. Yoshida KEK, Ibaraki
	Nextef is a new X-band test facility in KEK. By combining the power from two klystrons, 100MW-class X-band RF power will be available. The facility is for researches on future high gradient linear accelerators. The commissioning operation of the whole facility was started in November 2007. It is planed to conduct high power testing of X-band accelerator structures as well as the fundamental researches such as the RF breakdown experiment with specially designed waveguides.

WEPP097	Simulation of Wakefield Effect in ILC IR Chamber	simulation, impedance, luminosity, linac	2743
	S. Pei, T. O. Raubenheimer, A. Seryi, J. C. Smith SLAC, Menlo Park, California
	To achieve super high luminosity, high current beams with very short bunch length are needed, which carry high intensity EM fields. For ILC, two bunch trains with bunch length of 300μm and bunch charge of 3.2nC are needed to collide at the IR to achieve the ILC luminosity goals. When the 300μm bunches pass through the IR chamber, wakefields will be excited, which will cause HOM power flowing through the IR chamber beam pipe to the final doublets due to the high frequency characteristic of the induced wakefields. Since superconducting technology is adopted for the final doublets of ILC BDS, whose operation stability might be affected by the HOM power produced at the IR chamber, quench might happen. In this paper, we did some analytical estimation and numerical simulation on the wakefield effects in ILC IR chamber.

WEPP120	G4Beamline Particle Tracking in Matter-dominated Beam Lines	simulation, target, antiproton, space-charge	2776
	T. J. Roberts, K. B. Beard Muons, Inc, Batavia S. Ahmed, D. M. Kaplan, L. K. Spentzouris Illinois Institute of Technology, Chicago, Illinois D. Huang IIT, Chicago, Illinois
	Most computer programs that calculate the trajectories of particles in accelerators assume that the particles travel in an evacuated chamber. The development of muon beams, which are needed for future facilities such as muon colliders and neutrino factories, is limited by the lack of user-friendly numerical simulation codes that accurately calculate scattering and energy loss in matter. Geant4 is an internationally supported tracking toolkit that was developed to simulate particle interactions in large detectors for high energy physics experiments, and includes most of what is known about the interactions of particles and matter. Geant4 has been partially adapted in a program called G4beamline to develop muon beam line designs. We are continuing the development of G4beamline to enhance its graphical user-interface and add other features to the program to facilitate its use by a larger set of beam line and accelerator developers.

WEPP123	Isochronous Pion Decay Channel for Enhanced Muon Capture	target, factory, dipole, quadrupole	2785
	C. Y. Yoshikawa, C. M. Ankenbrandt, D. V. Neuffer, M. Popovic, K. Yonehara Fermilab, Batavia, Illinois R. J. Abrams, M. A.C. Cummings, R. P. Johnson Muons, Inc, Batavia Y. S. Derbenev Jefferson Lab, Newport News, Virginia
	Intense muon beams have many potential applications, including neutrino factories and muon colliders. However, muons are produced in tertiary beams into a diffuse phase space. To make useful beams, the muons must be rapidly cooled before they decay. A promising new concept for the collection and cooling of muon beams is being investigated, namely, the use of a nearly Isochronous Helical Transport Channel (IHTC) to facilitate capture of muons into RF bunches. Such a distribution could be cooled quickly and coalesced into a single bunch to optimize the luminosity of a muon collider. We describe the IHTC and provide simulations demonstrating isochronicity, even in the absence of RF and absorber.

WEPP133	High-gradient Multi-mode Two-beam Accelerating Structure	acceleration, simulation, coupling, linear-collider	2806
	S. V. Kuzikov, M. E. Plotkin IAP/RAS, Nizhny Novgorod J. L. Hirshfield Yale University, Physics Department, New Haven, CT S. Kazakov Omega-P, Inc., New Haven, Connecticut
	A new accelerating structure which is aimed to provide gradient >150 MV/m for next generation of multi-TeV linear colliders is suggested. The structure is based on periodic system of quasi-optical cavities. Each of these cavities is excited in several equidistantly-spaced eigen modes by the drive beam in such a way that the RF fields reach peak values only during the short time intervals when an accelerating bunch is resident in the cavities, thus exposing the cavity surfaces to strong fields for only a small fraction of time. This feature is expected to raise the breakdown and pulse heating thresholds. The proposed structure embodies most of additional attractive properties: the cavity is an all metallic structure, no transfer or coupling structures are needed between the drive and acceleration channels, the cavity fields are symmetric around the axes of the drive beam and the accelerated beam, the cavity can exhibit high transformer ratio. Calculations of single quasi-optical rectangular cavity with parameters of drive and accelerating beams close to ones adopted for the CLIC project show that high gradient as well as high efficiency are achievable. S. V. Kuzikov et al. "Quasi-optical accelerating structure operated with a superposition of synchronized modes," Conf. Digest of Joint 32nd IRMMW Conf., Cardiff, UK, 2007, Vol.2, p.797-798.

WEPP147	Aberration-free Muon Transport Line for Extreme Ionization Cooling: a Study of Epicyclic Helical Channel	resonance, simulation, cyclotron, dipole	2833
	A. Afanasev, R. P. Johnson Muons, Inc, Batavia Y. S. Derbenev Jefferson Lab, Newport News, Virginia
	Once the normalized transverse emittances of a muon beam have been cooled to some hundreds of microns, new techniques such as Parametric-resonance Ionization Cooling and Reverse Emittance Exchange can be used to focus the beam very tightly on beryllium energy absorbers for further transverse emittance reduction. The transport lines for these techniques have stringent requirements for the betatron tunes so that resonance conditions are properly controlled and for the dispersion function so that the longitudinal emittance can be controlled by emittance exchange using wedge-shaped absorbers. The extreme angular divergence of the beam at the absorbers implies large beam extension between the absorbers such that these techniques are very sensitive to chromatic and spherical aberrations. In this work we describe general and specific solutions to the problem of compensating these aberrations for these new muon cooling channels.

WEPP153	Status of the MANX Muon Cooling Experiment	emittance, dipole, simulation, beam-cooling	2844
	K. Yonehara, D. R. Broemmelsiek, M. Hu, A. Jansson, V. Kashikhin, V. S. Kashikhin, M. J. Lamm, M. L. Lopes, V. D. Shiltsev, V. Yarba, M. Yu, A. V. Zlobin Fermilab, Batavia, Illinois R. J. Abrams, M. A.C. Cummings, R. P. Johnson, S. A. Kahn, T. J. Roberts Muons, Inc, Batavia
	MANX is an experiment to prove that effective six-dimensional (6D) muon beam cooling can be achieved a Helical Cooling Channel (HCC) using ionization-cooling with helical and solenoidal magnets in a novel configuration. The aim is to demonstrate that 6D muon beam cooling is understood well enough to plan intense neutrino factories and high-luminosity muon colliders. The experiment consists of the HCC magnets that envelop a liquid helium energy absorber, upstream and downstream instrumentation to measure the particle or beam parameters before and after cooling, and emittance matching sections between the detectors and the HCC. Studies are presented of the effects of detector resolution and magnetic field errors on the beam cooling measurements.

WEPP155	Laser Driven Linear Collider	laser, acceleration, plasma, damping	2850
	A. A. Mikhailichenko Cornell University, Department of Physics, Ithaca, New York
	We continue detailed description of scheme allowing long term acceleration with >10 GeV/m in multi-cell microstructures side-illuminated by laser radiation. The basis of the scheme is a fast sweeping device for the laser bunch. After sweeping the laser bunch has a slope ~45° with respect to the direction of propagation. So the every cell of microstructure becomes excited locally only for the moments, when the particles are there. Self consistent parameters of collider based on this idea allow consideration this type of collider as a candidate for the near-future accelerator era.

WEPP161	Preliminary Experiments on a Fluidised Powder Target	target, factory, recirculation, vacuum	2862
	O. Caretta, C. J. Densham STFC/RAL, Chilton, Didcot, Oxon T. W. Davies Exeter University, Exeter, Devon R. M. Woods Gericke LTD, Ashton-under-Lyne
	In order to achieve higher resolutions the next generation of accelerator facilities is designed to operate with beam powers orders of magnitude higher than that handled by the current technology. So it is believed that the existing target and beam dump designs will be unsuitable to survive beam interactions depositing powers in the order of several megawatts. Good target design is important for the physics yield from experiments and crucial to the reliable operation of the facility. Furthermore the choice of target is strongly associated with the safety and cost of design (i.e., economic viability) of the entire facility. This article proposes a new target technology based on fluidised powder believed to be suitable for application at higher beam powers whilst avoiding some of the problems associated with other technologies. A conceptual system design for the application of the fluidised powder target to the requirements of a future neutrino facility, is presented. The preliminary experimental results presented, show the effect of some of the parameters which are expected to determine the performance, physics yields and reliability of operation of the new powder system.

WEPP163	Measurements of Collimator Wakefields at End Station A	simulation, radiation, feedback, linear-collider	2868
	J.-L. Fernandez-Hernando STFC/DL/ASTeC, Daresbury, Warrington, Cheshire S. Molloy SLAC, Menlo Park, California J. D.A. Smith Cockcroft Institute, Warrington, Cheshire N. K. Watson Birmingham University, Birmingham
	The angular kicks imparted to an electron beam with energy of 28.5 GeV when it passes through a collimator jaw with a certain offset, generating a wakefield, were measured in End Station A (ESA) in SLAC for fifteen different collimator configurations of geometry and material. Some configurations were chosen in order to compare with previous measurements while others served to study the effect of geometry and taper angles (geometrical contribution to the wakefield) and the effect of the material resistivity (resistive contribution) to the kick. This paper summarises the final experimental results. The reconstructed kick factor is compared to analytical calculations and simulations.

WEPP165	GdfidL Simulations of International Linear Collider Candidate Collimator Assemblies	simulation, linear-collider, insertion, vacuum	2874
	J. D.A. Smith Cockcroft Institute, Warrington, Cheshire
	Collimator performance is critical to the successful operation of any collider. Building on previous GdfidL simulations of collimator jaws, this paper describes simulations where STL files of the complete assembly are investigated and wakefield performance is determined and optimised.

WEPP168	Mechanical Design of Collimators for the ILC	radiation, vacuum, linear-collider, photon	2883
	B. D. Fell, D. Angal-Kalinin, S. C. Appleton, J.-L. Fernandez-Hernando, F. Jackson, O. B. Malyshev STFC/DL/ASTeC, Daresbury, Warrington, Cheshire N. Bliss STFC/DL, Daresbury, Warrington, Cheshire G. Ellwood, R. J.S. Greenhalgh STFC/RAL, Chilton, Didcot, Oxon J. D.A. Smith Cockcroft Institute, Warrington, Cheshire N. K. Watson Birmingham University, Birmingham
	Much attention has been paid to the optimisation of the geometry and material of collimators in the ILC to mitigate the effects of both short-range transverse wakefields and errant beam impacts. We discuss the competing demands imposed by realistic engineering constraints and present a preliminary engineering design for adjustable jaw spoilers for the ILC.

WEPP170	A 15-T Pulsed Solenoid for a High-power Target Experiment	target, proton, factory, power-supply	2889
	H. G. Kirk BNL, Upton, Long Island, New York J. R.J. Bennett STFC/RAL/ISIS, Chilton, Didcot, Oxon I. Efthymiopoulos, A. Fabich, F. Haug, H. Pereira CERN, Geneva K. T. McDonald PU, Princeton, New Jersey P. H. Titus MIT/PSFC, Cambridge, Massachusetts
	The MERIT experiment, which ran at CERN in 2007, is a proof-of-principle test for a target system that converts a 4-MW proton beam into a high-intensity muon beam for either a neutrino factory complex or a muon collider. The target system is based on a free mercury jet that intercepts an intense proton beam inside a 15-T solenoidal magnetic field. Here, we describe the design and performance of the 15-T, liquid-nitrogen-precooled, copper solenoid magnet.

THYG01	The ILC Beam Delivery System Design and R&D Programme	collimation, extraction, linear-collider, instrumentation	2907
	T. Tauchi KEK, Ibaraki
	The presentation will describe recent developments for the ILC beam delivery system. Special emphasis will be given to the R&D programme at existing and planned test facilities.
	Slides

THYG03	Ionization Cooling and Muon Colliders	emittance, factory, dipole, luminosity	2917
	R. P. Johnson Muons, Inc, Batavia
	Recent developments in the field of muon beam cooling are reviewed. A view of the impact of new cooling concepts on the overall design of muon colliders is included, as are the prospects for the experimental verification of the required muon beam cooling concepts and technology.
	Slides

THXM01	CLIC Accelerating Structure Development	damping, site, simulation, linac	2922
	W. Wuensch CERN, Geneva
	One of the most important objectives of the CLIC (Compact Linear Collider) study is to demonstrate the design accelerating gradient of 100 MV/m in a fully featured accelerating structure under nominal operating conditions including pulse length and breakdown rate. The development and testing program which has been put into place to achieve this objective is described. Recent advances in understanding and quantifying the effects which limit the accelerating gradient are presented.
	Slides

THYM03	Advanced Computing Tools and Models for Accelerator Physics	simulation, space-charge, electron, linac	2947
	R. D. Ryne LBNL, Berkeley, California
	The design of the next generation of accelerators will require a new level of simulation capability to perform high resolution, multi-physics modelling of beam dynamics phenomena and to design complex 3D electromagnetic structures. Thanks to the availability of computational resources that will soon reach the petascale, we will be able to perform simulations involving unprecedented size, complexity, and physical realism. This paper will review the state-of-the-art in scientific computing for accelerator physics.
	Slides

THPC074	Observation of Coherent Oscillations of Colliding Bunches at the Tevatron	proton, antiproton, beam-beam-effects, pick-up	3158
	A. Valishev, V. Kamerdzhiev, V. A. Lebedev Fermilab, Batavia, Illinois F. A. Emanov BINP SB RAS, Novosibirsk
	Commissioning of the new digital tune monitor (DTM) at the Tevatron made it possible to observe vertical dipole oscillations of individual bunches at any time during an HEP store. Since all the bunches have significantly different collision conditions, this device provides vast possibilities for investigation of coherent beam-beam effects. We present theoretical model and experimental observations of coherent beam-beam modes. Analysis of the DTM data and its agreement with theory are discussed.

THPC080	The VEPP-4M Dynamic Aperture Determination with Beam-beam Effects	dynamic-aperture, beam-beam-effects, simulation, insertion	3170
	A. N. Zhuravlev, V. A. Kiselev, E. B. Levichev, O. I. Meshkov, P. A. Piminov, D. N. Shatilov, V. V. Smaluk BINP SB RAS, Novosibirsk
	To determine experimentally the particle stable area under the influence of beam-beam effects in the electron-positron collider VEPP-4M we measure the beam lifetime with high accuracy as a function of moving aperture. The measurement is performed by a photodiode installed in the collider diagnostic beam line. The experimental setup and the measurement results are described. Comparison with the tracking simulation is presented.

THPC114	Design and Performance of a Prototype Digital Feedback System for the International Linear Collider Interaction Point	feedback, kicker, linear-collider, extraction	3245
	P. Burrows, B. Constance, H. Dabiri Khah, J. Resta-López JAI, Oxford R. Apsimon, P. Burrows, C. I. Clarke, A. F. Hartin, C. Perry, C. Swinson OXFORDphysics, Oxford, Oxon G. B. Christian ATOMKI, Debrecen A. Kalinin STFC/DL/ASTeC, Daresbury, Warrington, Cheshire
	We present the design and preliminary results of a prototype beam-based digital feedback system for the Interaction Point of the International Linear Collider. A custom analogue front-end processor, FPGA-based digital signal processing board, and kicker drive amplifier have been designed, built, and tested on the extraction line of the KEK Accelerator Test Facility (ATF). The system was measured to have a base latency of approximately 140 ns, increasing to approximately 148 ns with the inclusion of real-time charge normalisation.