HB2006 - List of Keywords (extraction)

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

extraction

Paper	Title	Other Keywords	Page
MOAP02	Recent Beam Commissioning Results from the Spallation Neutron Source	linac, target, proton, emittance	6
	S. Henderson ORNL, Oak Ridge, Tennessee
	The Spallation Neutron Source accelerator complex consists of a 2.5 MeV H^- front-end injector system, a 186 MeV normal-conducting linear accelerator, a 1 GeV superconducting linear accelerator, an accumulator ring and associated beam transport lines. The beam commissioning campaign of the SNS accelerator complex, initiated in 2002, has been performed in seven discrete runs as each successive portion of the accelerator complex has been installed. The final beam commissioning run, in which beam was transported to the liquid mercury target was recently completed. In the course of beam commissioning, most beam performance parameters and beam intensity goals have been achieved at low duty factor. The beam performance and beam dynamics measurements of the linac and ring will be presented.

MOCP01	Beam intensity upgrade at Fermilab	proton, booster, target, antiproton	34
	A. Marchionni Fermilab, Batavia, Illinois
TUAX01	Accumulation of High Intensity Beam and First Observations of Instabilities in the SNS Accumulator Ring*	impedance, kicker, lattice, electron	59
	V. V. Danilov, A. V. Aleksandrov, S. Assadi, W. Blokland, S. M. Cousineau, C. Deibele, S. Henderson, J. A. Holmes, M. A. Plum, A. P. Shishlo ORNL, Oak Ridge, Tennessee
	The Spallation Neutron Source accumulator ring, designed to accumulate up to 1.5·10¹⁴ protons per pulse, was commissioned in January of 2006. During the run, over 1.·10¹⁴ protons were accumulated in the ring in the natural chromaticity state without any sign of instabilities. The first beam instabilities were observed for a high intensity coasting beam with zero chromaticity. Preliminary analysis of data indicates instabilities related to extraction kicker impedances, and electron-proton instability. Here we review the background theory and design philosophy of the ring, as it relates to instabilities, and compare the pre-commissioning predictions with the experimental measurements.

TUBX01	Impedance and radiation generated by a ceramic chamber with RF shields and TiN coating	impedance, space-charge, electromagnetic-fields, synchrotron	125
	Y. H. Chin, S. Lee, K. Takata, T. Toyama KEK, Ibaraki Y. Shobuda JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken H. Tsutsui SHI, Tokyo
	In the RCS (Rapid Cycle Synchrotron) ring of J-PARC, we use ceramic chambers with the interior TiN coating and exterior Cu RF shields in the magnet sections. A new theory has been developed for calculation of impedance in this unusual configuration. When it was applied to a prototype RCS ceramic chamber, the calculation results got good agreement with the measurement results. We also considered the dipole radiation from gaps between Cu shields of the ceramic chamber in the bending magnets. The effects turn out to be rather small thanks to the special configuration of the ceramic chambers. We measured the radiation from a ceramic break with and without RF shields and capacitors in the KEK, PS and found that the RF shields with capacitors considerably suppress the radiation from the ceramic break. We summarize all these studies in this paper.

TUBX03	Coupling impedance of the J-PARC kicker magnets	kicker, impedance, coupling, synchrotron	140
	T. Toyama, Y. Hashimoto, E. Nakamura, Y. Shirakabe KEK, Ibaraki J. Kamiya, Y. Shobuda JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken
	The single- and twin-wire measurements both for the longitudinal ( ZL ) and transverse impedances ( ZT ) will be discussed for the J-PARC kicker magnets: a lumped circuit kicker and several types of traveling wave kickers. The question if a position shifted single-wire can measure ZT is discussed. The measurement results are compared with the equivalent circuit analysis. The relation between the imaginary part of the impedance and causality will also be discussed.

WEAY02	Electron cooling of 8 GeV antiprotons at Fermilab’s Recycler: Results and operational implications	electron, antiproton, emittance, beam-losses	182
	L. R. Prost, D. R. Broemmelsiek, A. V. Burov, K. Carlson, C. Gattuso, M. Hu, T. K. Kroc, J. R. Leibfritz, S. Nagaitsev, S. M. Pruss, G. W. Saewert, C. W. Schmidt, A. V. Shemyakin, M. Sutherland, V. Tupikov, A. Warner Fermilab, Batavia, Illinois
	Electron cooling of 8 GeV antiprotons at Fermilab’s Recycler storage ring is now routinely used in the collider operation. It requires a 0.1-0.5 A, 4.3 MeV DC electron beam that reduces the longitudinal phase-space of the circulating antiproton beam. This paper first describes the characteristics of the electron beam that was achieved to successfully cool antiprotons as well as its necessary stability. Then, results from various cooling force measurements along with comparison to a simple non-magnetized model will be presented. Finally, operational aspects of the implementation of electron cooling at the Recycler will be discussed, such as regulation of the cooling rate and the influence of the electron beam on the antiprotons lifetime.

WEAZ01	Overview of beam loss mechanisms in injection and extraction	injection, beam-losses, linac, emittance	172
	M. Tomizawa KEK, Ibaraki
WEAZ03	DESIGN AND TESTS OF A LOW-LOSS MULTI-TURN EJECTION FOR THE CERN PS	septum, kicker, beam-losses, emittance	192
	M. Giovannozzi CERN, Geneva
	Following the positive results of the three-year measurement campaign at the CERN Proton Synchrotron, the study of a possible implementation of the proposed multi-turn extraction based on beam splitting with stable islands in the transverse phase space was undertaken. A substantial reduction of beam losses, with respect to the present extraction scheme, should be achieved with the proposed technique when delivering the high-intensity proton beams required for the planned CERN Neutrino to Gran Sasso Project. Major modifications to the ring layout are foreseen, such as a new design of the extraction bumps including also the installation of three additional kickers to create a closed-bump over the five turns used to extract the split beam. The ring aperture was reviewed and improvements are proposed to reduce possible beam losses between beam splitting and extraction. The goal consists of implementing the proposed changes by beginning of 2008 and to commission the novel extraction during the 2008 PS physics run.

WEAZ06	Transfer line damage during high intensity proton beam extraction from the SPS in 2004	power-supply, simulation, vacuum, septum	228
	B. Goddard, V. Kain, V. Mertens, J. A. Uythoven, J. Wenninger CERN, Geneva
	During extraction of a high intensity beam from the SPS in 2004 an incident occurred in which the vacuum chamber of a transfer line quadrupole magnet was badly damaged. The beam was a 450 GeV full LHC injection batch of 3.4·10¹³ p+ in 288 bunches, and was extracted with the wrong trajectory. The incident causes have been identified, with details reconstructed from the logged data and the damage to the vacuum chamber. The remedial measures which were taken are explained, and further recommendations made concerning the interlocking system performance and tests, as well as the operational procedures which must be adopted when commissioning with high intensities. The specific issues of how the incident happened, why the existing protection system was not sufficient and what can/has been done about it are addressed.

THAZ03	Safe LHC Beam Commissioning	injection, dumping, collimation, beam-losses	306
	J. A. Uythoven, R. Schmidt CERN, Geneva
	Due to the large amount of energy stored in magnets and beams, safe operation of the LHC is essential. The commissioning of the LHC machine protection system will be an integral part of the general LHC commissioning program. A brief overview of the LHC Machine Protection System will be given, identifying the main components: the Beam Interlock System, the Beam Dumping System, the Collimation System, the Beam Loss Monitoring system and the Quench Protection System. An outline is given of the commissioning strategy of these systems during the different commissioning phases of the LHC: without beam, injection and the different phases with stored beam depending on beam intensity and beam energy.

THAZ06	Commissioning scenarios for the J-PARC accelerator complex	linac, injection, closed-orbit, acceleration	329
	T. Koseki KEK, Ibaraki
	The J-PARC accelerator complex consists of a 400-MeV linac, a 3.0-GeV rapid-cycling synchrotron (RCS), a 50-GeV main ring (MR) and associated beam transport lines to experimental facilities, which use the 3- and 50-GeV proton beams. It is now under construction in the Tokai campus of JAEA as a joint project between JAEA and KEK. The beam commissioning of each accelerator is scheduled to start for linac in December 2006, RCS in September 2007 and MR in May 2008. The commissioning strategy for the accelerator complex will be presented.

THBY01	Acceleration of Intense Beams of Highly-Charged Ions using Direct Plasma Injection Scheme	ion, rfq, target, plasma	341
	A. Kondrashev ITEP, Moscow R. A. Jameson, M. Okamura RIKEN, Saitama T. Kanesue Kyushu University, Fukuoka H. Kashiwagi JAEA/ARTC, Gunma-ken K. Sakakibara RLNR, Tokyo J. Tamura TIT, Yokohama
	Laser Ion Source (LIS) is the most intense source of highly-charged ions capable to provide beams with current 10 / 100 mA and pulse durations 1 / 10 μs. Such parameters well meet requirements of single turn injection into synchrotron rings and FFAG. Few years ago Direct Plasma Injection Scheme (DPIS) was proposed to extract and accelerate intense ion beams from laser induced plasma. By this approach extraction of ions happens almost inside first acceleration cell of RFQ, eliminating severe space charge problems in LEBT and LEBT itself. About 35 mA of 12C⁴⁺ ions and 17 mA of 12C⁶⁺ ions were accelerated by RFQ up to 100 keV/u using DPIS. Amplitude of total current of carbon ions is equal to 60 mA. The latest results on 27Al and 56Fe ions acceleration using DPIS are presented. The results obtained show that DPIS is, probably, the best choice as a high current injector of highly-charged ions for FFAG.

FRAP03	Summary of Working Group C+G (Part I)	beam-losses, target, collimation, injection	365
	N. V. Mokhov Fermilab, Batavia, Illinois K. Hasegawa JAEA, Ibaraki-ken S. Henderson ORNL, Oak Ridge, Tennessee R. Schmidt CERN, Geneva M. Tomizawa KEK, Ibaraki K. Wittenburg DESY, Hamburg