EPAC08 - List of Keywords (factory)

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factory

Paper	Title	Other Keywords	Page
MOPC087	The MERIT (nTOF-11) High Intensity Liquid Mercury Target Experiment at the CERN PS	target, proton, simulation, collider	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.

MOPC153	Construction and Test of the Superconducting Coils for RIKEN SC-ECR Ion Source	sextupole, ion, ion-source, cyclotron	433
	J. Ohnishi, A. Goto, Y. Higurashi, K. Kusaka, T. Nakagawa, H. Okuno RIKEN, Wako, Saitama T. Minato Mitsubishi Electric Corp., Energy Systems Centre, Kobe
	A superconducting ECR ion source is under development to increase the intensity of the beams with high charge state such as U³⁵⁺ provided to the RI-beam factory at RIKEN. The ion source consists of six superconducting solenoids and a set of superconducting sextupoles. The axial magnetic fields are 3.8 T at the injection peak and 2.2 T at the extraction peak. The sextupole magnetic field is 2.0 T on the inner surface of the plasma chamber with a diameter of 15 cm. The conductors use NbTi/copper wires with copper/SC ratio of 1.3 and size of 1.25 mm x 0.92 mm. The sextupole coils are difficult to design and fabricate because the maximum experience magnetic field is about 7.3 T and the magnetic force acting on the coils changes by the strength of the radial field of the solenoids along the axis. The design, construction and the results of the excitation test will be presented in this paper.

MOPD003	ILC Cavity Fabrication Optimization for High Production	vacuum, electron, radio-frequency, linear-collider	451
	A. J. Favale, M. Calderaro, E. Peterson, J. J. Sredniawski AES, Medford, NY
	In 2006, AES performed a US based industrial Cost Study of RF units in production quantities sufficient for the ILC. During this study detailed costs were estimated for the fabrication steps of the SRF cavities in high production quantities. In late 2007, AES carried out a more detailed study specifically oriented toward optimizing the high production methods of only the SRF cavities to arrive at a best estimate of cost. We have found that the revised estimate shows a 34% reduction in cavity fabrication cost. We have optimized many of the machining and welding steps to take advantage of automated operations were possible. Our high production cost estimates were based upon actual machining, welding and parts handling times derived during the prototype fabrication of ILC type cavities at AES. These values were then applied with learning as appropriate to more automated operations to reduce labor costs. In addition, the type and size of e-beam welding machines was optimized. We found that the use of all single chamber welders covering three specific sizes was most cost effective. Details of steps leading to the stated conclusions are presented herein.

MOPD025	Status of the 805-MHz Pulsed Klystrons for the Spallation Neutron Source	klystron, cathode, gun, electron	499
	S. Lenci, E. L. Eisen CPI, Palo Alto, California M. P. McCarthy ORNL, Oak Ridge, Tennessee
	Communications and Power Industries, Inc (CPI) produced 81 klystrons for the Spallation Neutron Source at Oak Ridge National Laboratory. The klystrons are rated for 550 kW peak at 805 MHz. Seventy units have accumulated 1.2M hours of filament operation and 820K hours of high voltage operation through January 2008. A higher power 700 kW version has been developed and is now in production with 12 of the 38 units on order delivered through January 2008. Performance specifications, computer model predictions, operating results, production statistics, and operational status will be presented.

MOPD033	The ALBA RF Amplifier System Based on Inductive Output Tubes (IOT)	controls, coupling, power-supply, storage-ring	523
	P. Sanchez, D. Einfeld, M. L. Langlois, F. Pérez ALBA, Bellaterra J. Alex, A. Spichiger, J. Stahl Thomson Broadcast & Multimedia AG, Turgi C. Bel, G. Peillex-Delphe, P. Ponard TED, Thonon
	The ALBA accelerator RF systems include a complete new transmitter developed in collaboration between Thomson Broadcast & Multimedia (TBM), Thales Electron Devices (TED) and CELLS. A new IOT version, based on the previous TH793 has been developed by TED: the TH793-1, dedicated to scientific applications. It has demonstrated cw operation up to 90 kW at 500 MHz. In addition, a TH18973 LS cavity has also been developed, featuring a 6”1/8 coaxial RF output, an optimized cooling system and centred operation at 500 MHz, 7 MHz bandwidth and ± 5 MHz tuning range. TBM developed a new amplifier system to achieve high reliability and performance. Each IOT is powered by an individual power supply based on the Pulse Step Modulator technology. The amplifier control system was designed on a PLC controller with the possibility to interface with the Tango control system. The first amplifier was delivered to ALBA in summer 2007 and is already in use for the conditioning and testing of the first RF cavity. The remaining 13 amplifiers will be delivered in the second half of 2008. The paper gives an overview on the design and operation performance during commissioning and cavity testing.

MOPP099	MICE RF System	power-supply, controls, emittance, superconducting-magnet	787
	A. J. Moss, P. A. Corlett, J. F. Orrett, J. H.P. Rogers STFC/DL/ASTeC, Daresbury, Warrington, Cheshire
	The Muon Ionisation Cooling Experiment (MICE) at the Rutherford Appleton Laboratory uses normal conducting copper cavities to re-accelerate a muon beam after it has been retarded by liquid hydrogen absorbers. Each cavity operates at 200MHz and requires 1MW of RF power in a 1ms pulse at a repetition rate of 1Hz. In order to provide this power, a Thales TH116 triode, driven by a Burle 4616 tetrode is used, with each amplifier chain providing ~2.5MW. This power is then split between 2 cavities. The complete MICE RF system is described, including details of the low level RF, the power amplifiers and the coaxial power distribution system.

MOPP116	Commissioning of the Cornell ERL Injector RF Systems	klystron, controls, linac, diagnostics	832
	S. A. Belomestnykh, J. Dobbins, R. P.K. Kaplan, M. Liepe, P. Quigley, J. J. Reilly, C. R. Strohman, V. Veshcherevich CLASSE, Ithaca
	Two high power 1300 MHz RF systems have been developed for the Cornell University ERL Injector. The first system, based on a 16 kWCW IOT transmitter, is to provide RF power to a buncher cavity. The second system employs five 120 kWCW klystrons to feed 2-cell superconducting cavities of the injector cryomodule. The sixth, spare klystron is used to power a deflecting cavity in a pulsed mode for beam diagnostics. A digital LLRF control stem was designed and implemented for precise regulation of the cavities’ field amplitudes and phases. All components of these systems have been recently installed and commissioned. The results from the first turn-on of the systems are presented.

TUPC012	MICE: The International Muon Ionization Cooling Experiment: Diagnostic Systems	emittance, dipole, quadrupole, diagnostics	1068
	A. D. Bross Fermilab, Batavia, Illinois T. L. Hart IIT, Chicago, Illinois
	The Muon Ionization Cooling Experiment will make detailed measurements of muon ionization cooling using a new constructed low-energy muon beam at the Rutherford Appleton Laboratory. The experiment is a single-particle experiment and utilizes many detector techniques from High-Energy Physics experiments. To characterize and monitor the muon beam line, newly developed scintillating fiber profile monitors will employed. In order to monitor the purity of the beam and tag the arrival time of individual muons, a dual Aerogel Cerenkov system and a plastic scintillator time-of-flight system will be used. The 4-momenta of the muons will be measured by two identical spectrometer systems (one before and one after the cooling apparatus) which employ a fiber tracker that utilizes 350 micron diameter scintillator fiber. An additional time-of-flight system and electron and muon calorimeters are used to tag outgoing muons. We will discuss the design of the MICE diagnostic systems, the operation and give the first results from beam measurements in the MICE experimental hall. A. Bross on behalf of the MICE collaboration.

TUPC091	Measurement of Quadrupolar Tune Shifts under Multibunch Operations of the Photon Factory Storage Ring	storage-ring, single-bunch, synchrotron, quadrupole	1269
	S. Sakanaka, T. Mitsuhashi, T. Obina KEK, Ibaraki
	The quadrupolar tune shifts were observed under a single-bunch operation of the Photon Factory storage ring at KEK, which indicated that a quadrupolar component of wakefields affected the motion of an electron bunch. We recently measured the quadrupolar tune shifts under a multibunch operation of the Photon Factory storage ring. To detect the transverse quadrupole-mode oscillations of electron bunches, we used an avalanche photo diode (APD) which can detect visible synchrotron light with short rise-time of less than 1 ns. As a result, we observed that the quadrupolar tunes depended on the total beam current by 0.0082 1/A (in horizontal) and -0.0082 1/A (in vertical), respectively. These tune shifts can be caused by a quadrupolar component of long-range wakefield.

WEPC092	A Pulsed Quadrupole Magnet Injection at the PF-AR Storage Ring	injection, beam-losses, dipole, quadrupole	2207
	H. Takaki, N. Nakamura ISSP/SRL, Chiba K. Harada, Y. Kobayashi, T. Miyajima, S. Nagahashi, T. Obina, A. Ueda, K. Umemori KEK, Ibaraki
	We have examined a beam injection system that used a pulsed quadruple magnet (PQM) at the PF-AR storage ring since the spring of 2004. The system is operating well and the accumulation of the beam up to 60mA in the single bunch operation is possible by the current state. The beam injection system that uses the PQM does not require a conventional injection bump orbit, and has the feature that only one PQM in the injection part is needed. An injected beam is kicked to be proportional to the distance from the center and captured afterwards. On the other hand, the pulse kick hardly influences the stored beam at the magnetic field center of the PQM. We report on the result of collecting the basic data of the influence on the PQM beam injection at the PF-AR storage ring.

WEPD002	Magnetic Design Studies for the Final Focus Quadrupoles of the SuperB Large Crossing Angle Collision Scheme	quadrupole, target, background, simulation	2401
	E. Paoloni University of Pisa and INFN, Pisa S. Bettoni CERN, Geneva M. E. Biagini, P. Raimondi INFN/LNF, Frascati (Roma)
	The vertical focusing element closest to the interaction point of the SuperB factory based on the large crossing angle collision scheme (~50 mrad), must provide a pure quadrupolar field on each of the two beams. This allows to avoid the high background rate in the detector which would be produced by the over-bend of the off-energy particles if a dipolar component were present. Because of the small separation of the two beams in the transverse dimension (only 2 cm) the influence of each winding on the other one is not negligible and, for the same space limitation, a multi-layer configuration is not suitable to compensate the high order multipoles. A novel design, based on 'helical-type' windings, has therefore been investigated. The windings generates the pure quadrupolar field as a superposition of the inner field of the surrounding coil and of the outer fringe field of the neighbor one. The same idea may be used to produce two pure quadrupolar fields with opposite strength, suitable for the final focus elements in colliders, as LHC, where the sign of the circulating particles are the same. In this paper the 2D concept and the 3D model of this design are presented.

WEPP046	Final Focus for the Crab-waist Tau-charm Factory	quadrupole, luminosity, interaction-region, collider	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.

WEPP119	The International Design Study for a Neutrino Factory	target, proton, acceleration, linac	2773
	C. R. Prior STFC/RAL/ASTeC, Chilton, Didcot, Oxon J. S. Berg BNL, Upton, Long Island, New York M. Meddahi CERN, Geneva Y. Mori KURRI, Osaka
	The International Design Study (IDS) is the successor to the International Scoping Study (ISS), which identified a baseline scenario for a Neutrino Factory. IDS was launched in August 2007, with the aim of developing the baseline to the point where a full, technical design report can be written. The accelerator complex starts with a 4 MW proton driver operating at 50 Hz producing three to five, 1-2 ns bunches per pulse. The proton beam impacts on a liquid mercury jet target; pions are generated and are captured in a solenoid channel; they decay to muons which are phase rotated and formed into trains of interleaved bunches alternating in sign. The muon bunches then undergo ionisation cooling so as to be accepted by a linac, two dogbone recirculating linacs and finally an FFAG for acceleration to 25GeV. The muons are transferred to purpose-built storage rings, with long production straights, where they decay to neutrinos which are directed to detectors at distances of about 3000 km and 7500 km. IDS will be developing this baseline design, identifying its strengths and weaknesses, and progressing the whole towards a self-consistent scenario for the final technical design report stage.

WEPP121	Recirculating Ring for an Ionization Cooling Channel	emittance, lattice, closed-orbit, simulation	2779
	C. T. Rogers STFC/RAL/ASTeC, Chilton, Didcot, Oxon
	In a muon acceleration facility such as a Neutrino Factory or Muon Collider, the muons created from pion decay occupy a large volume of phase space. For a good capture efficiency this phase space should be reduced and this is typically achieved using ionisation cooling channels. These are quite expensive but the cost can be reduced by recirculating muons through the cooling hardware. Recirculating a high emittance beam typical of a Neutrino Factory is very challenging if it is to be achieved without significant losses. I describe latest attempts to design a high acceptance recirculator for a muon front end.

WEPP123	Isochronous Pion Decay Channel for Enhanced Muon Capture	target, collider, 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.

WEPP124	The Status of Turkish Accelerator Complex Project	linac, electron, positron, synchrotron	2788
	A. Aksoy, Ö. Karsli, B. Ketenoglu, O. Yavas Ankara University, Faculty of Engineering, Tandogan, Ankara A. K. Ciftci Ankara University, Faculty of Sciences, Tandogan/Ankara S. Sultansoy TOBB ETU, Ankara
	The Turkish Accelerator Complex (TAC) is proposed as a regional facility for accelerator based fundamental and applied research in 1997 with support of Turkish State Planning Organization (DPT). The feasibility and conceptual design phases of TAC proposal were completed in 2001 and 2005, respectively. Again with support of DPT, the technical design phase of TAC was started at the beginning of 2006. The complex will include 1 GeV electron linac and 3.56 GeV positron ring for linac on ring type electron-positron collider as a charm factory and a few GeV proton linac. Besides the particle factory, it is also planned to produce SASE FEL from electron linac and synchrotron radiation from positron ring. It is planed that the TDR of TAC Project will be completed in 2011 and the construction will be performed during following ten years .

WEPP161	Preliminary Experiments on a Fluidised Powder Target	target, recirculation, collider, 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.

WEPP169	The MERIT High-power Target Experiment at the CERN PS	proton, target, injection, diagnostics	2886
	H. G. Kirk, H. Park, T. Tsang BNL, Upton, Long Island, New York 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 I. Efthymiopoulos, A. Fabich, F. Haug, J. Lettry, M. Palm, H. Pereira CERN, Geneva K. T. McDonald PU, Princeton, New Jersey N. V. Mokhov, S. I. Striganov Fermilab, Batavia, Illinois
	The MERIT experiment was designed as a proof-of-principle test of a target system based on a free mercury jet inside a 15-T solenoid that is capable of sustaining proton beam powers of up to 4MW. The experiment was run at CERN in the fall of 2007. We describe the results of the tests and their implications.

WEPP170	A 15-T Pulsed Solenoid for a High-power Target Experiment	target, proton, collider, 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.

THYG03	Ionization Cooling and Muon Colliders	collider, emittance, 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

THPP094	The Development of a Fast Beam Chopper for Next Generation High Power Proton Drivers	proton, rfq, linac, ion	3584
	M. A. Clarke-Gayther STFC/RAL/ISIS, Chilton, Didcot, Oxon
	The Front End Test Stand (FETS) project at RAL will test a fast beam chopper, designed to address the requirements of high-power proton drivers for next generation pulsed spallation sources and neutrino factories. The RAL ‘Fast-Slow’ chopping scheme for the 2.5 MeV, 280 MHz, ESS Medium Energy Drift Space (MEBT)* is evolving to address the requirements of the 3.0 MeV, 324 MHz, FETS project. The recent adoption of a more efficient optical design for the FETS MEBT** will result in a useful increase in beam aperture and permit an important reduction in the amplitude of the chopper E-fields. A description is given of a 'state of the art' high voltage pulse generator designed to address the FETS 'Slow' chopper requirement. Measurements of output waveform and timing stability are presented. M. Clarke-Gayther, "A Fast Beam Chopper for Next Generation High Power Proton Drivers," EPAC04. *M. Clarke-Gayther et al. "A fast beam chopper for the RAL Front-End Test Stand," EPAC06.

THPP136	The Replacement of the Isis White-circuit Choke	coupling, synchrotron, proton, power-supply	3679
	S. West, M. G. Glover, J. W. Gray STFC/RAL/ISIS, Chilton, Didcot, Oxon K. Papp, K. Pointner TA, Leonding L. A.E. Van Lieshout Imtech Vonk, Coevorden
	ISIS, located at the Rutherford Appleton Laboratory is the world’s leading pulsed neutron source. It produces intense bursts of neutrons every 20mS when 800MeV protons are fired into a heavy metal target by an accelerating synchrotron. The ISIS synchrotron is based on a resonant “White Circuit”* allowing superimposed DC and AC currents to circulate in the ring of dipole and quadrupole magnets. The magnets themselves resonate with tuned capacitor banks at 50Hz and a large ten-winding choke allows both a path for the DC component of the current and a means to inject the AC power which maintains the 50Hz AC oscillation. This choke, which dates from the 1960’s, was a veteran of the “NINA” synchrotron in Daresbury before it began service at ISIS. Should it fail it could take at years to repair and a scheme is now well under way to replace it with ten individual chokes with in-situ spares so that the system will gain redundancy and robustness. This paper covers progress to date and the problems that have been encountered and their solutions. *M. G. White et al. "A 3-BeV High Intensity Proton Synchrotron," The Princeton-Pennsylvania Accelerator, CERN Symp.1956 Proc., p525.