APAC 2007 - List of Keywords (collider)

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

collider

Paper	Title	Other Keywords	Page
MOOPMA02	Overview of Regional Infrastructure for SCRF Development	linac, controls, linear-collider, cryogenics	31
	C. Pagani INFN/LASA, Segrate (MI)
	The unanimous ICFA decision to choose the TESLA “cold” technology as the basis for the International Linear Collider, ILC, gave a global impulse to the superconducting RF, SCRF, technology. The perspective of building large accelerators based on high gradient superconducting cavities poses a number of new problems in term of performance reproducibility, large scale manufacturing and cost containment. In parallel with the ongoing R&D on basics in labs and universities, new large regional SCRF infrastructures are being developed to qualify treatment, assembly procedures and ancillary integration in performing cryomodules. US at Fermilab and Asia at KEK are strongly investing in these facilities and also Europe is considering duplicating and adjourning at CERN the operational facility set up at DESY by the TESLA Collaboration. In this paper the ongoing global effort on SCRF through the development of large regional infrastructures is outlined together with their status and plans.
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TUXMA02	Record Luminosities at the Tevatron & Future Potentiality	luminosity, proton, antiproton, target	51
	S. J. Werkema Fermilab, Batavia, Illinois
	Fermilab Collider Run II has been in progress for nearly six years. During this tine the D0 and CDF experiments have each acquired total integrated luminosities of nearly 2.2 fb-1. Also during this time the peak instantaneous luminosities increased by more than a factor of 25 ' from 10 to as high as 270 ×10³⁰ cm^-2 s-1. An aggressive collider upgrade program continues to make significant progress in conjunction with luminosity production operations. This paper will give the status of Tevatron operations and expectations for the remainder of Run II.
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TUXMA03	Next Generation Electron-Ion Colliders	electron, ion, luminosity, proton	56
	I. Ben-Zvi BNL, Upton, Long Island, New York
	The next generation of electron-ion colliders is expected to deliver much higher luminosity, a high degree of polarization of both the leptons and hadrons, multiple interaction points and large ratios of beam energies as compared to the first end only such collider, HERA. Energy Recovery Linacs (ERLs) have significant potential uses as providers of lepton beams for colliders in High Energy Physics and Nuclear Physics. We describe plans for these colliders which are under development by various laboratories and the technology issues that are associated with these applications. The advantages of ERLs for these applications are numerous and will be outlined in the text. It is worth noting that some of these advantages are the high-brightness of the ERL beams and their relative immunity to beam-beam disturbances.
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TUPMA008	Status of the VEPP-4M Electron-Positron Collider	monitoring, lepton, luminosity, controls	112
	V. V. Petrov BINP SB RAS, Novosibirsk
	Since 2004, the principal high-energy physics experiment carried out at the VEPP-4M electron-positron collider is precise measurement of the tau-lepton mass. Moreover, a series of experiments to improve measurement accuracy of the J/psi, psi(2s) and psi(3770) mesons has been performed. During all the high-energy physics experiments, absolute calibrations of beam energy by the resonant depolarization method and routine energy monitoring using the Compton back-scattering technique were realized. Monitoring of beam energy spread, which is also important, was implemented using several techniques. To provide the VEPP-4M high performance, some investigation and further development of the machine have been done, the most important results are described.

TUPMA064	ILC Activity at JINR and Siting in Dubna Region	power-supply, linear-collider, electron, luminosity	202
	G. V. Trubnikov, Yu. N. Denisov, I. N. Meshkov, G. Shirkov, A. N. Sissakian JINR, Dubna, Moscow Region
	JINR actively participates in ILC project. JINR physicists are planning to take part in several fields of activity in ILC: works on photo injector prototype, participation in design and construction of cryomodules, laser metrology, etc. Moreover Joint Institute is full-member pretender for possible hosting of ILC in the region near Dubna. International intergovernmental status of JINR, comfortable location of site, well developed infrastructure, geological, climate and relief conditions may become powerful advantages of Dubna siting among other proposals of ILC location. All above mentioned topics are discussed in the presented report.

TUPMA075	Status of the CTF3 Frequency Multiplication Rings	linac, electron, vacuum, injection	217
	A. Ghigo, C. Biscari, F. Marcellini, M. Serio, A. Stella INFN/LNF, Frascati (Roma) R. Corsini, S. Doebert, G. Geschonke, L. Rinolfi, F. Tecker, P. Urschütz CERN, Geneva
	The CLIC Test Facility (CTF3) is in construction at CERN by an international collaboration to demonstrate the feasibility of two beam acceleration scheme at the CLIC parameters. The drive beam of the CTF3 is composed by a fully loaded Linac that generates a long bunch train and two rings that provide the high current and bunch frequency multiplication by interleaving bunch trains. The status of the commissioning of the first ring (Delay Loop) and of the transfer lines are reported together with the installation of the second ring (Combiner Ring).

WEZH101	Real Time Feedback on Beam Parameters	feedback, controls, coupling, synchrotron	295
	R. J. Steinhagen CERN, Geneva
	Traditionally, tight beam parameter stability requirements were most pronounced for light sources and lepton colliders but became increasingly important for present and future hadron accelerator operation, not only for performance but also for reasons of machine protection, as recent improvements lead to significantly increased stored beam energies. In the latest generation machines the performance depends critically on the stability of the beam. In order to counteract disturbances due to magnetic imperfections, misalignments, ground motion, temperature changes and other dynamic effects, fully automated control of the key beam parameters –- orbit, tune, coupling, chromaticity and energy -– becomes an increasingly important aspect of accelerator operation. This contribution presents an overview of beam-based feedback systems, their architecture, performance limitations and design choices involved. invited oral
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WEPMA068	Comparison of the Methods for Beam Energy Spread Measurement at the VEPP-4M	betatron, wiggler, resonance, electron	416
	A. N. Zhuravlev, V. Kiselev, O. I. Meshkov, N. Yu. Muchnoi, V. V. Smaluk, V. N. Zhilich BINP SB RAS, Novosibirsk
	The knowledge of beam energy spread is necessary for the experimental program of VEPP-4M collider. In this report we discuss the application of several diagnostics for studying of this value. We applied the Compton BackScattering (CBS) technique for direct measurement of the energy spread of the beam. The obtained data are compared with the value of the spread derived from the radial and longitudinal beam size as well as from betatron frequencies of the beam. The value of energy spread were determined for set of operating mode of the collider.

WEPMA105	High Power Test of C-band Accelerating System for Japanese XFEL Project	klystron, linac, power-supply, vacuum	470
	K. Shirasawa, T. Inagaki, H. Kitamura, T. Shintake RIKEN Spring-8 Harima, Hyogo H. Baba, H. Matsumoto KEK, Ibaraki S. Miura MHI, Hiroshima
	?The C-band (5712 MHz) choke-mode type accelerating structure will be used for SCSS: SPring-8 Compact SASE Source project. Since the C-band accelerator generates higher accelerating gradient than traditional S-band accelerator, it makes the machine size compact and the cost low. In order to confirm the performance of the C-band accelerating system for the 8 GeV XFEL machine, the system including the same accelerating structure and RF system have been installed in the SCSS prototype accelerator. The first SASE amplification was observed at 49 nm on June 2006. In the prototype machine, four 1.8 m long C-band accelerating structures are used to accelerate electron up to 250 MeV. The C-band accelerator?unit has one 50 MW klystron and pulse compressor, where two types of pulse compressors: SKIP and SLED were adapted. After 300-hour RF conditioning, accelerating gradient up to 32 MV/m was achieved and we confirmed there is no serious problem. Now we continue the RF conditioning to get higher accelerating gradient and find the practical limit. In this paper, we would like to report on the RF conditioning and the achieved performance of the C-band accelerator.

THYMA02	Progress in Understanding the High-gradient Limitations of Accelerating Structures	linear-collider, emittance, damping, linac	544
	W. Wuensch CERN, Geneva
	CLIC main linac accelerating structures have extremely demanding high-gradient, high-power and wakefield performance requirements. The research program which has been put into place to develop such structures, as well as recent experimental and technological results are described. The current understanding of the effects which both limit the ultimate accelerating gradient and fix the practical operating gradient is presented.
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THPMA078	Wideband Current Transformers for the Surveillance of the Beam Extraction Kicker System of the Large Hadron Collider	extraction, kicker, beam-losses, shielding	746
	C. Defrance, J. F. Bergoz BERGOZ Instrumentation, Saint Genis Pouilly L. Ducimetière, E. Vossenberg CERN, Geneva
	The LHC beam dumping system must protect the LHC machine from damage by reliably and safely extracting and absorbing the circulating beams when requested. Two sets of 15 extraction kicker magnets form the main active part of this system. A separate high voltage pulse generator powers each magnet. Because many failures are deemed catastrophic, the magnets and generators are continuously surveyed in order to generate a failsafe beam abort as soon as an internal fault is detected. Amongst these surveillance systems, wideband current transformers have been designed to detect any erratic starts in one of the generators. The current transformers were developed in collaboration with industry. To minimize losses, high-resistivity cobalt alloy was chosen for the cores. The annealing techniques originally developed for LEP beam current measurement in collaboration between CERN and industry allowed to extend the frequency response beyond that of traditional core materials. The paper shows the results obtained, exposes the problems encountered with shielding, conductor position sensitivity, load resistor technology and their solutions.

THPMA085	Mechanical Coupling between the LHC Cryogenic Distribution Line and the Short Straight Section housing the Superconducting Quadrupole. Theoretical Analysis and Experimental Validation	vacuum, alignment, coupling, hadron	758
	S. Dutta, S. C. Bapna, J. Dwivedi, S. Kotaiah, A. Kumar, R. S. Sandha, H. C. Soni RRCAT, Indore (M. P.) C. Garion, A. Poncet, B. Skoczen CERN, Geneva
	The cryogenic module of the Short Straight Section (SSS) of Large Hadron Collider (LHC) is supplied with liquid & gaseous Helium through a jumper connection, which links the valve distribution box of the Cryogenic Distribution Line (QRL) & the SSS. The internal as well as external features of the jumper construction allow for sufficient flexibility to reduce the reaction forces responsible for elastic deformations when the SSS is moved for alignment. The SSS is composed of a cold mass and an external vacuum vessel equipped with fiducials for allowing the precise alignment of the machine when the cryostat is finally closed. A deformation of the structure from reaction forces induced by relative displacements of the SSS and the QRL, if unpredictable, would result in a dangerous misalignment of the quadrupole magnetic axis. A unified FE model, validated by a 40 meter long dedicated test setup at CERN, was generated at RRCAT to study the elastic behaviour of the SSS under the conditions of alignment. Transfer functions linking the action on the SSS external alignment jacks and the position of the cold mass are now available that will be used to properly align the machine in operation.

THPMA131	Indian Participation in LHC, SPL and CTF-3 Projects at CERN, Switzerland	dipole, linac, vacuum, klystron	829
	V. C. Sahni, V. B. Bhanage, J. Dwivedi, A. K. Jain, P. Khare, S. Kotaiah, A. Kumar, P. K. Kush, S. S. Prabhu, A. Puntambekar, A. Rawat, A. Sharma, R. S. Shridhar, P. Shrivastava, G. Singh RRCAT, Indore (M. P.) R. K. Sadhu BARC, Mumbai
	After signing a Protocol on 29 March 1996 to the 1991 cooperation agreement with CERN, Switzerland, India is participating in the construction of CERN’s most challenging and ambitious particle accelerator the “Large Hadron Collider” (LHC). The contributions span from hardware, software, and skilled manpower support for evaluation of some of the LHC sub-systems and presently to the support in commissioning of various subsystems of LHC. With major achievements on Indian part during the course of time CERN has now invited India to jointly participate further to build CERN’s Advanced Accelerator Projects like Super conducting Proton LINAC, SPL and Compact Linear Collider Test Facility, CTF-3. The present paper describes the achievements to date and high lights the ongoing and future collaboration activities.

FRYMA02	Towards a Multi TeV Linear Collider; Drive Beam Generation with CTF3	linac, linear-collider, acceleration, emittance	847
	H.-H. Braun CERN, Geneva
	The 3 TeV compact linear collider, CLIC, foresees an RF source based on a high current drive beam running parallel with the main linac. To generate this drive beam of very high instantaneous power a sophisticated complex consisting of a fully beam-loaded linac and several stages of beam compression is used. Although this scheme is very promising in terms of cost and power efficiency, it needs demonstration in a scaled version before construction of CLIC can be envisaged. This is the aim of the CLIC Test Facility CTF3, build by an international collaboration. CTF3 is constructed and exploited in several phases. Here we report present status, experimental achievements and future plans for CTF3.
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