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MOYKI01 e+e- Factories luminosity, storage-ring, vacuum, electron 12
 
  • M. K. Sullivan
  Funding: Work supported by USDOE contract DE-AC02-76SF00515

The achievements of the e+e- Factories have been impressive. The KEK B- Factory has achieved a peak luminosity of 1.7x1034 cm2/s and the PEP-II B-Factory has reached 1.2x1034 cm2/s while the Dafne Phi-Factory has obtained 1.5x1032 cm2/s. Early in the B-Factory running, CP violation in the B meson system was found to be consistent with the prediction of the Standard Model. Now all three factories are integrating as much luminosity as they can in order to look for rare decay channels that may have a rate that differs from the value predicted by the Standard Model and therefore hint at New Physics. I will give a status report on the most recent accomplishments of all three factories PEP-II, KEKB and Dafne and will show what the three facilities have for plans to further improve performance.

 
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MOZAKI01 Compensation of the Crossing Angle with Crab Cavities at KEKB luminosity, coupling, emittance, resonance 27
 
  • K. Oide
  • T. Abe, K. Akai, M. Akemoto, A. Akiyama, A. Arinaga, K. Ebihara, K. Egawa, A. Enomoto, J. W. Flanagan, S. Fukuda, H. Fukuma, Y. Funakoshi, K. Furukawa, T. Furuya, K. Hara, T. Higo, S. Hiramatsu, H. Hisamatsu, H. Honma, K. Hosoyama, T. Ieiri, N. Iida, H. Ikeda, M. Ikeda, S. Isagawa, H. Ishii, A. Kabe, E. Kadokura, T. Kageyama, K. Kakihara, E. Kako, S. Kamada, T. Kamitani, K.-I. Kanazawa, H. Katagiri, S. Kato, T. Kawamoto, S. Kazakov, M. Kikuchi, E. Kikutani, K. Kitagawa, H. Koiso, Y. Kojima, K. Komada, T. Kubo, K. Kudo, N. K. Kudo, K. Marutsuka, M. Masuzawa, S. Matsumoto, T. Matsumoto, S. Michizono, K. Mikawa, T. Mimashi, S. Mitsunobu, K. Mori, A. Morita, Y. Morita, H. Nakai, H. Nakajima, T. T. Nakamura, H. Nakanishi, K. Nakao, S. Ninomiya, Y. Ogawa, K. Ohmi, Y. Ohnishi, S. Ohsawa, Y. Ohsawa, N. Ohuchi, M. Ono, T. Ozaki, K. Saito, H. Sakai, Y. Sakamoto, M. Sato, M. Satoh, K. Shibata, T. Shidara, M. Shirai, A. Shirakawa, T. Sueno, M. Suetake, Y. Suetsugu, R. Sugahara, T. Sugimura, T. Suwada, O. Tajima, S. Takano, S. Takasaki, T. Takenaka, Y. Takeuchi, M. Tawada, M. Tejima, M. Tobiyama, N. Tokuda, S. Uehara, S. Uno, Y. Yamamoto, Y. Yano, K. Yokoyama, Ma. Yoshida, M. Yoshida, S. I. Yoshimoto, K. Yoshino
    KEK, Ibaraki
  • E. Perevedentsev, D. N. Shatilov
    BINP SB RAS, Novosibirsk
  The crab cavities are presently being installed in the KEKB rings to compensate the crossing angle at collision and thus increase luminosity. This will be the first experience with such cavities in colliders. Results on the beam operation of the new cavities, both for single and colliding beams, will be presented including the luminosity performance and limitations.

Work presented on behalf of the KEKB Accelerator Group.

 
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MOZBC01 National Nuclear Security and Other Applications of Rare Isotopes target, site, background, simulation 124
 
  • M. N. Kreisler
  The proposed Rare Isotope Accelerator will produce large quantities of short-lived isotopes in beams suitable for experiments in low energy nuclear physics and nuclear astrophysics. The full suite of particles available offers the opportunity for advances in other scientific fields and applied technologies, including national security, medical technology, material science, and nuclear energy.  
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MOPAN030 Analysis of Transverse Beam Oscillation at Photon Factory feedback, betatron, injection, damping 221
 
  • W. X. Cheng
  • T. Obina
    KEK, Ibaraki
  FPGA based bunch by bunch feedback system to cure the transverse instabilities has been in operation stably since Oct. 2005. Specification and performance of the system will be introduced, transient measurement has been done to analyze the instability modes, which helps to understand the instability sources. Bunch by bunch beam oscillation, together with the digital turn-by-turn beam position measurement, injection oscillation damping is recorded and analyzed, transverse beam oscillation with and without the bunch by bunch feedback system will be shown in this paper. Precise tune measurement during this period will be presented. Turn by turn phase space monitor is also available with the data, from which the nonlinear beam dynamics can be revealed.  
 
MOPAN036 Longitudinal Feedback System for the Photon Factory feedback, kicker, synchrotron, impedance 233
 
  • T. Obina
  • W. X. Cheng, T. Honda, M. Tobiyama
    KEK, Ibaraki
  In the KEK-PF, longitudinal coupled-bunch instabilities are suppressed by means of the RF phase-modulation technique during the users operation. This method is very effective not only to suppress the instabilities but also to enlarge the beam lifetime. Together with the feasibility study for top-up operation, bunch-by-bunch feedback system have been developed. A two-port longitudinal kicker based on dafne-type cavity were designed and installed in the storage ring in the summer of 2006. FPGA-based signal processing part is under development based on the KEKB design. As an preliminary test of the longitudinal kicker, a simple mode-feedback system which suppress a specific coupled-bunch mode were tested successfully.  
 
MOPAN041 Design of a Movable Synchrotron Radiation Mask with SiC Absorber for the Photon Factory Advanced Ring (PF-AR) synchrotron, synchrotron-radiation, photon, klystron 248
 
  • T. Takahashi
  • M. Izawa, S. Sakanaka, K. Umemori
    KEK, Ibaraki
  • H. Suzuki, J. Watanabe
    Toshiba, Yokohama
  We have six rf cavities in the Photon Factory Advanced ring (PF-AR) at KEK. Three years ago, one of them was seriously damaged by the Synchrotron Radiation (SR) from the upstream of the cavity. In order to protect the cavities from SR, we intend to install SR masks nearby the cavities. The masks have to be positioned as close as possible to the beams in order to block the SR completely during the beam storage, and as far as possible during the beam injection. Therefore SR masks should be movable. Since it is placed under strong HOM power from the cavities, careful design is necessary for power dissipation. The basic structure of the movable masks is a coaxial wave-guide with cylindrical SiC absorber whose power capability is designed to be more than 1kW. We report the design of the movable SR masks and the result of rf power test.  
 
MOPAN067 Transport and Installation of the LHC Cryo-Magnets acceleration, dipole, insertion, 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.  
 
MOPAN072 High-precision Performance Testing of the LHC Power Converters controls, monitoring, instrumentation, collider 320
 
  • G. Fernqvist
  • M. C. Bastos, A. Cantone, P. Dreesen, O. Fournier, G. Hudson
    CERN, Geneva
  The magnet power converters for LHC were procured in three parts, power part, current transducers and control electronics, to enable a maximum of industrial participation in the manufacturing and still guarantee the very high precision (a few parts in 10-6) required by LHC. One consequence of this approach was several stages of system tests: factory reception tests, CERN reception tests, integration tests, short-circuit tests and commissioning on the final load in the LHC tunnel. The majority of the power converters for LHC have now been delivered, integrated into complete converters and high-precision performance testing is well advanced. This paper presents the techniques used for high-precision testing and the results obtained. It is also hoped to report results from the first sector commissioning.  
 
MOPAN085 Completion of the Series Fabrication of the Main Superconducting Quadrupole Magnets of LHC quadrupole, dipole, cryogenics, insertion 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.  
 
MOPAS094 A High-Power Target Experiment at the CERN PS target, proton, collider, extraction 646
 
  • H. G. Kirk
  • J. R.J. Bennett
    STFC/RAL/ASTeC, 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
  • I. Efthymiopoulos, A. Fabich, F. Haug, J. Lettry, M. Palm
    CERN, Geneva
  • K. T. McDonald
    PU, Princeton, New Jersey
  • N. V. Mokhov, S. I. Striganov
    Fermilab, Batavia, Illinois
  We test a target concept of a free-flowing mercury stream embedded in a high-field solenoid. The goal is to demonstrate the copious production of secondary pions and tertiary muons in a megawatt class proton beam at the front end of a neutrino factory or muon collider. Key components are described and results of the experimental commissioning phase are given.  
 
MOPAS095 Study of the RHIC BPM SMA Connector Failure Problem cryogenics, superconducting-magnet, radiation 649
 
  • C. J. Liaw
  • R. Schroeder, R. Sikora
    BNL, Upton, Long Island, New York
  About 730 cryogenic beam position monitors (BPMs) are mounted on the RHIC CQS and triplet superconducting magnets. Semi-rigid coaxial cables bring the electrical signal from BPM feedthroughs to outside flanges at ambient temperature. Each year approximately 10 cables fail during RHIC operations. The connection usually fails at the warm end of the cable, either from solder joint failure or retraction of the center conductor in the SMA connector. Finite element analyses were performed to understand the solder joint failure mechanism. Results showed that (1) the SMA center conductor can separate from the mating connector due to the thermal retraction,(2) the maximum thermal stress at the warm end solder joint can exceed the material strength of the Pb37/Sn63 solder material, and (3) magnet ramping frequency (~10 Hz) during the machine startup can possibly resonate the coaxial cable and damage the solder joint. This failure problem can be resolved by repairing with silver bearing solder material (a higher strength material) and crimping the cable at the locations close to the SMA connector to prevent center conductor retraction.  
 
TUXKI01 Advances in High Power Targets target, proton, radiation, kaon 676
 
  • H. G. Kirk
  High power targets are one of the major issues for both neutron sources and neutrino factories. The paper will review status of studies worldwide, including those at JPARC and SNS etc. Results from the MERIT liquid-jet Hg target experiment at CERN will also be covered.  
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TUXKI02 Recommendations from the International Scoping Study for a Neutrino Factory target, proton, linac, acceleration 681
 
  • C. R. Prior
  The International Scoping Study (ISS), a one-year review set up at the behest of CCLRC, aimed to lay the foundation for a planned international design study (IDS) for a neutrino factory or superbeam facility over the next three to five years. A team of experienced accelerator physicists were asked to examine the accelerator work carried out to date, identify a fully self-consistent and viable scenario, and specify areas for immediate study and R&D. The ISS Report, published in late 2006, makes recommendations for all parts of a Neutrino Factory complex, from the proton driver, through muon production and acceleration to the final decay ring, which directs the neutrino beams through the earth to far detectors. The paper describes these proposals, explaining the reasoning behind them, and outlines the work currently being undertaken in preparation for the IDS.  
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TUYKI02 Status of the RIKEN RIB Factory cyclotron, acceleration, ion, heavy-ion 700
 
  • Y. Yano
  A series of ring cyclotrons have been constructed/under construction to accelerate radioactive ion beams to very high energy, e.g. 350MeV/u for uranium. Status of the project will be reported. Commissioning and/or operational experience with the large superconducting ring cyclotrons will be presented. Experience with the projectile fragment separator (BigRIPS) and two new large spectrometers will also be covered.  
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TUOBKI02 Low Emittance Muon Colliders emittance, collider, simulation, RF-structure 706
 
  • R. P. Johnson
  • Y. S. Derbenev
    Jefferson Lab, Newport News, Virginia
  Funding: The work described here was supported in part by DOE SBIR/STTR grants DE-FG02-03ER83722, 04ER86191, 04ER84016, 05ER86252, 05ER86253 and 06ER86282.

Advances in ionization cooling, phase space manipulations, and technologies to achieve high brightness muon beams are stimulating designs of high-luminosity energy-frontier muon colliders. Simulations of Helical Cooling Channels (HCC) show impressive emittance reductions, new ideas on reverse emittance exchange and muon bunch coalescing are being developed, and high-field superconductors show great promise to improve the effectiveness of ionization cooling. Experiments to study RF cavities pressurized with hydrogen gas in strong magnetic fields have had encouraging results. A 6-dimensional HCC demonstration experiment is being designed and a 1.5 TeV muon collider is being studied at Fermilab. Two new synergies are that very cool muon beams can be accelerated in ILC RF structures and that this capability can be used both for muon colliders and for neutrino factories. These advances are discussed in the context of muon colliders with small transverse emittances and with fewer muons to ease requirements on site boundary radiation, detector backgrounds, and muon production.

 
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TUPMN100 LCLS Undulator Production undulator, linac, extraction, photon 1148
 
  • E. Trakhtenberg
  • T. Barsz, P. K. Den Hartog, G. S. Lawrence, E. R. Moog, S. Sasaki, I. Vasserman, M. White
    ANL, Argonne, Illinois
  • T. Becker, S. Dufresne, W. Kummerle, R. Schuermann
    Metalex Manufacturing, Cincinnati, Ohio
  • G. Goldfarb, N. Lagonsky, S. Lagonsky, S. Sorsher
    Hi-Tech Manufacturing, Schiller Park, Illinois
  Funding: Work supported by the U. S. Dept. of Energy, under contract numbers DE-AC02-06CH11357 and DE AC03-76SF00515.

Design and construction of the undulators for the Linac Coherent Light Source (LCLS) is the responsibility of Argonne National Laboratory. A prototype undulator* was constructed in-house and was extensively tested. The device was tunable to well within the LCLS requirements and was stable over a period of several years. Experience constructing the prototype undulator led us to conclude that with appropriate engineering design and detailed assembly procedures, precision undulators can be constructed by qualified vendors without previous undulator-construction experience. Our detailed technological knowledge and experience were transferred to the successful bidders who have produced outstanding undulators. Our production concept for the 40 3.4 m long, fixed-gap, planar-hybrid undulators with a 30 mm period is presented. Manufacturing, quality assurance, and acceptance testing details are also presented.

*LCLS Prototype Undulator Report, Argonne National Laboratory Report ANL/APS/TB-48, January 2004, R. Dejus, Editor.

 
 
TUPAN034 Super-B Factory using Low Emittance Storage Rings and Large Crossing Angle collider, interaction-region, injection, luminosity 1460
 
  • J. Seeman
  • M. E. Biagini, P. Raimondi
    INFN/LNF, Frascati (Roma)
  • Y. Cai, M. K. Sullivan, U. Wienands
    SLAC, Menlo Park, California
  Funding: Work supported by US DOE contract DE-AC02-76SF00515.

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 over 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 at 4 GeV x 7 GeV are stored in low-emittance damping rings similar to those designed for a Linear Collider (LC). 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 (±30 mrad) is used at the collision point to allow beam separation and reduce the hourglass effect. Beam currents of about 3 A x 2 A in 1700 bunches can produce a luminosity of 1036/cm2/s. Design parameters and beam dynamics effects are discussed.

 
 
TUPAN114 RF Design Options for a 180 MeV H- Linac for Megawatt Beam Facilities linac, proton, impedance, quadrupole 1643
 
  • D. C. Plostinar
  Future projects like a neutrino factory or an advanced spallation neutron source require high power proton accelerators capable of producing beams in the multi-MW range. The quality of the beam delivered to the target is very much dictated by the accelerator front end and by the lower energy linac. Prompted by the Front End Test Stand (FETS) under construction at RAL, a new 180 MeV H- linac is being considered as a possible replacement for the aging current 70 MeV ISIS injector, and the same linac has also been included in designs for the proton driver for a possible UK Neutrino Factory. In this paper, different RF design options are analysed and a general layout for the new linac is presented based on two accelerating structures to raise the beam energy from 3 to 180 MeV: a 324 MHz Drift Tube Linac (DTL) making use of commercial Toshiba klystrons, followed by Side Coupled Linac (SCL) with a triple frequency jump at the transition between the two structures.  
 
TUPAS002 RFQ Cold Model RF Measurements and Waveguide-to-Coaxial line Transition Design for the Front-End Test Stand at RAL rfq, simulation, klystron, quadrupole 1655
 
  • Y. A. Cheng
  • A. Kurup, P. Savage
    Imperial College of Science and Technology, Department of Physics, London
  • A. P. Letchford
    STFC/RAL/ISIS, Chilton, Didcot, Oxon
  • J. K. Pozimski
    STFC/RAL, Chilton, Didcot, Oxon
  A 324MHz four vane RFQ cold model has been built, as part of the development of a proton driver front end test stand at the Rutherford Appleton Laboratory (RAL) in the UK. This paper will present the results of RF measurements performed on the cold model, which include analysis of resonant modes, Q-value measurements and electric field profile measurements using a bead-pull perturbation method. These measurements were done before and after brazing of the four vanes and the results were compared to Microwave Studio simulations. Additionally a tuner has been designed, built and tested and the results will be presented together with the electromagnetic design of waveguide-to-coaxial line transition structures for the four vane RFQ.  
 
TUPAS066 Interaction Region Design for a Super-B Factory background, radiation, interaction-region, synchrotron 1805
 
  • M. K. Sullivan
  • M. E. Biagini, P. Raimondi
    INFN/LNF, Frascati (Roma)
  • J. Seeman, U. Wienands
    SLAC, Menlo Park, California
  Funding: Work supported by US DOE contract DE-AC02-76SF00515

We present a preliminary design of an interaction region for a Super-B Factory with luminosity of 1x1036 cm2/s. The collision has a ± 17 mrad crossing angle and the first magnetic element starts 30 cm from the collision point. We show that synchrotron radiation backgrounds are controlled and are at least as good as the backgrounds calculated for the PEP-II accelerator. How the beams get into and out of a shared beam pipe is illustrated along with the control of relatively high synchrotron radiation power from the outgoing beams. The high luminosity makes radiative bhabha backgrounds significantly higher than that of the present B-Factories and this must be addresed in the initial design.

 
 
WEPMN037 Manufacture and Assembly of the 6 Meter-Long Cryomodules for Superconducting RF Test Facility (STF) at KEK vacuum, cryogenics, radiation, insertion 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.  
 
WEPMN073 A New Klystron Modulator for XFEL based on PSM Technology klystron, controls, power-supply, simulation 2200
 
  • J. Alex
  • M. Bader, J. Troxler
    Thomson Broadcast & Multimedia AG, Turgi
  Funding: Supported by DESY contract.

Thomson Broadcast & Multimedia has been awarded a contract from DESY to design and build a prototype klystron modulator for the XFEL project. This modulator will be built in pulse step modulator (PSM) technology. This technology will allow to control the pulse form to achieve a maximum flatness of the pulse without tuning any high power components. The modulator will also have a built-in power regulation to prevent voltage flicker of the mains. The paper will give an overview about the principles of the modulator and presents the status of the design. It also shows simulation results about the expected performance.

 
 
THYAB01 Muon Accelerators acceleration, emittance, linac, proton 2614
 
  • S. Machida
  Funding: The work is supported by the UK Neutrino Factory/Particle Physics and Astronomy Research Council (PPARC) under Contract No. 2054.

Accelerator of muon has to have very large acceptance and very quick acceleration. Recent study shows that FFAGs (in particular non-scaling) are one of the most promising candidates for muon accelerators as building block for a neutrino factory. There are, however, some unresolved problems which should be studied in more detail. We will talk about mostly beam dynamics issues of the muon accelerators, not only FFAG, but other candidates such as linac and RLA and compare their performance.

 
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THOBAB01 EMMA - the World's First Non-scaling FFAG acceleration, extraction, diagnostics, injection 2624
 
  • T. R. Edgecock
  EMMA - the Electron Model of Muon Acceleration - is to be built at the CCLRC Daresbury Laboratory in the UK. It will demonstrate the principle of non-scaling FFAGs and be used to study the features of this type of accelerator in detail. Although a model of the muon accelerators in a Neutrino Factory, EMMA will have sufficient flexibility to study a variety of applications. It has been designed by an international collaboration of accelerator physicists and will be built as part of the CONFORM project using funds recently approved in the UK.  
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THIAKI02 The US Industrial ILC RF Unit Cost Study vacuum 2671
 
  • E. C. Bonnema
  • J. J. Sredniawski
    AES, Medford, NY
  A major goal of the ILC Global Design Effort (GDE) is to produce an ILC Reference Design Report and an ILC Technical Design Report. Physicists and policy-makers will use these reports to decide the future of the project. As part of these reports detailed concept, performance assessments, reliable international costing, an industrialization plan, siting analysis, as well as detector concepts and scope must be developed. As part of this effort, a contract for an industrial cost study for fabrication of the Cryomodules and RF Power Systems that make up the RF units of the ILC was commissioned to Advanced Energy Systems and their team partners, CPI and Meyer Tool. This presentation will discuss the methodology of the industrial cost study and summarize important assumptions. The public results and key cost drivers will be presented.  
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THIAKI03 Design and Fabrication of Superconducting Cavities for STF electron, superconducting-RF, vacuum 2674
 
  • K. Sennyu
  • H. Hara, M. Matsuoka
    MHI, Kobe
  Some superconducting cavities developed at MHI recently are introduced. The outline of 4 STF (Superconducting RF Test Facility at KEK) baseline cavities designed and fabricated by MHI are described. Some problems and some improvements in the mass production of the superconducting cavity are reported.  
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THPMN081 Measuring Single Particle Amplitudes with MICE emittance, scattering, insertion, 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.  
 
THPMN095 Muon Bunch Coalescing collider, emittance, lattice, luminosity 2930
 
  • R. P. Johnson
  • C. M. Ankenbrandt, C. M. Bhat, M. Popovic
    Fermilab, Batavia, Illinois
  • S. A. Bogacz, Y. S. Derbenev
    Jefferson Lab, Newport News, Virginia
  Funding: Supported in part by DOE STTR grants DE-FG02-04ER86191 and -05ER86253.

The idea of coalescing multiple muon bunches at high energy to enhance the luminosity of a muon collider provides many advantages. It circumvents space-charge, beam loading, and wakefield problems of intense low-energy bunches while restoring the synergy between muon colliders and neutrino factories based on muon storage rings. A sampling of initial conceptual design work for a coalescing ring is presented here.

 
 
THPMN106 Use of Harmonics in RF Cavities in Muon Capture for a Neutrino Factory or Muon Collider lattice, target, collider, proton 2957
 
  • D. V. Neuffer
  • R. P. Johnson
    Muons, Inc, Batavia
  • C. Y. Yoshikawa
    Fermilab, Batavia, Illinois
  Funding: Supported in part by DOE STTR grant DE-FG02-05ER86252

Common to various front end designs for a muon collider or neutrino factory are costly low frequency RF cavities used to bunch muons. In this paper we show that adding higher harmonic RF cavities to the bunching section of a muon capture channel can provide as good or better bunching efficiency than the case where only the fundamental is used. Since higher harmonic cavities are less expensive to build and operate, this approach implies significant cost savings.

 
 
THPMN119 Status of the International Muon Ionization Cooling Experiment (MICE) coupling, target, emittance, vacuum 2996
 
  • M. S. Zisman
  Funding: Work supported by U. S. Dept. of Energy, Office of High Energy Physics, under contract no. DE-AC02-05CH11231.

An international experiment to demonstrate muon ionization cooling is scheduled for beam at Rutherford Appleton Laboratory in 2007. The experiment comprises one cell of the Study II cooling channel*, along with upstream and downstream detectors to identify individual muons and measure their initial and final 6D phase-space parameters to a precision of 0.1%. Magnetic design of the beam line and cooling channel are complete and portions are under construction. The experiment will be described, including hardware designs, fabrication status, and running plans. Phase 1 of the experiment will prepare the beam line and provide detector systems, including time-of-flight, Cherenkov, scintillating-fiber trackers and the spectrometer solenoids, and an electromagnetic calorimeter. The Phase 2 system will add the cooling channel components, including liquid-hydrogen absorbers embedded in superconducting focus solenoids, 201-MHz normal-conducting RF cavities, and their surrounding coupling coil solenoids. The MICE Collaboration goal is to complete the experiment by 2010; progress toward this goal will be indicated. The supporting R&D program and its present results will also be described.

*S. Ozaki, R. Palmer, M. Zisman, and J. Gallardo (eds.), "Feasibility Study II of a Muon-based Neutrino Source," BNL-52623, 2001; http://www.cap.bnl.gov/mumu/studyii/final_draft/The-Report.pdf.

 
 
THPMS019 Comparison of 6D Ring Cooler Schemes and Dipole Cooler for Mu+Mu- Collider Development collider, dipole, emittance, simulation 3038
 
  • D. B. Cline
  • Y. Fukui
    SLAC, Menlo Park, California
  • A. A. Garren
    LBNL, Berkeley, California
  We discuss the various schemes to use ring coolers for 6D cooling for Mu+Mu- colliders. The earliest successful cooler used dipoles and quadrupoles and a high dispersion low beta region. This was also proposed in the form of solenoids. Recently, there have been many new ideas. The simplest is to use a simple dipole ring with high-pressure gas absorber or Li hydride. We show the results of simulations and compare with the results for other cooler schemes.  
 
THPMS041 Disruption of Particle Detector Electronics by Beam Generated EMI radiation, collider, electron, linear-collider 3094
 
  • G. R. Bower
  • R. Arnold, M. Woods
    SLAC, Menlo Park, California
  • N. Sinev
    University of Oregon, Eugene, Oregon
  • Y. Sugimoto
    KEK, Ibaraki
  The possibility that beam generated electromagnetic interference (EMI) could disrupt the operation of particle detector electronics has been of some concern since the inception of short pulse electron colliders more than 30 years ago, Some instances have been reported where this may have occurred but convincing evidence has not been available. This possibility is of concern for the ILC. We have conducted test beam studies demonstrating that electronics disruption does occur using the vertex detector electronics from the SLD detector which ran at the SLC at SLAC. We present the results of those tests and we describe the need for EMI standards, for beam and detector instrumentation, at the ILC.  
 
THPMS068 Systems Testing of a Free Hg Jet System for Use in a High-Power Target Experiment target, proton, diagnostics, laser 3136
 
  • V. B. Graves
  • A. J. Carroll, P. T. Spampinato
    ORNL, Oak Ridge, Tennessee
  • I. Efthymiopoulos, A. Fabich
    CERN, Geneva
  • H. G. Kirk, H. Park, T. Tsang
    BNL, Upton, Long Island, New York
  • K. T. McDonald
    PU, Princeton, New Jersey
  • P. Titus
    MIT/PSFC, Cambridge, Massachusetts
  Funding: U. S. Deparment of Energy contract DE-AC05-00OR22725

The design and operational testing of a mercury jet delivery system is presented. The equipment is part of the Mercury Intense Target (MERIT) Experiment, which is a proof-of-principle experiment to be conducted at CERN in the summer of 2007 to determine the feasibility of using an unconstrained jet of mercury as a target in a Neutrino Factory or Muon Collider. The Hg system is capable of producing a 1 cm diameter, 20 m/s jet of Hg inside a high-field solenoid magnet. A high-speed optical diagnostic system allows observation of the interaction of the jet with a 24 GeV proton beam. Performance of the Hg system will be presented, along with results of integrated systems testing without a beam.

 
 
THPAN103 G4Beamline Simulation Program for Matter-dominated Beamlines simulation, emittance, collider, target 3468
 
  • T. J. Roberts
  • D. M. Kaplan
    Illinois Institute of Technology, Chicago, Illinois
  Funding: Supported in part by DOE STTR grant DE-FG02-06ER86281

G4beamline is a single-particle simulation program optimized for the design and evaluation of beam lines. It is based on the Geant4 toolkit, and can implement accurate and realistic simulations of particle transport in both EM fields and in matter. This makes it particularly well suited for studies of muon collider and neutrino factory design concepts. G4beamline includes a rich repertoire of beamline elements and is intended to be used directly without C++ programming by accelerator physicists. The program has been enhanced to handle a larger class of beamline and detector systems, and to run on Linux, Windows, and Macintosh platforms.

 
 
THPAS014 MICE: the International Muon Ionization Cooling Experiment: Phase Space Cooling Measurement emittance, simulation, background, electron 3543
 
  • T. L. Hart
  Muon storage rings have been proposed for use as sources of intense high-energy neutrino beams and as the basis for multi-TeV lepton-antilepton colliding-beam facilities. Optimizing the performance of such facilities is likely to require the phase-space compression (cooling) of the muon beam prior to acceleration and storage. The short muon lifetime makes traditional beam-cooling techniques ineffective. Ionization cooling, a process in which the muon beam is passed through a series of energy absorbers followed by accelerating RF cavities, is thus the technique of choice. The international Muon Ionization Cooling Experiment (MICE) collaboration is constructing the apparatus for a muon ionization-cooling demonstration experiment, to be conducted at Rutherford Appleton Laboratory over the next 3 years. The MICE cooling channel, its instrumentation, and its implementation at the Rutherford Appleton Laboratory are described together with the predicted performance of the channel and the measurements that will be made.  
 
FRPMN039 Measurement of Quadrupolar Tune Shifts After the Reconstruction of the Photon Factory Storage Ring quadrupole, storage-ring, betatron, photon 4039
 
  • S. Sakanaka
  • T. Mitsuhashi, T. Obina
    KEK, Ibaraki
  The tune shift of transverse quadrupolar oscillations is a measure of a quadrupolar component of wakefields in the storage ring*. By measuring both dipolar and quadrupolar tune shifts, one can estimate the dipolar and the quadrupolar components of wakefields (exactly, kick factors) independently. We carried out such measurements before and after the upgrade of the Photon Factory storage ring. The results showed the change in the tune shifts which were caused by the replacement of many (about two-thirds of the ring) vacuum chambers.

* S. Sakanaka, T. Mitsuhashi, and T. Obina, Phys. Rev. ST Accel. Beams 8, 042801 (2005).