HEBT MOMENTUM SCRAPER, H+ RAY TRACE SIMULATION AND VACUUM CHAMBER DESIGN.

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In the 1MW Spallation Neutron Source (SNS), the High-Energy Beam Transfer line (HEBT) connects the LINAC to the accumulator ring. A major requirement of the SNS complex is to have low uncontrolled beam loss (lnA/m), to allow hands on maintenance. The vacuum requirement for the HEBT is 5x10{sup {minus}8} Torr. Excessive H{sup {minus}} stripping will occur above this pressure and increase losses in the machine. The HEBT is also equipped with three sets of beam halo scrapers, one for momentum and two for transverse collimation. The momentum scraper is located at a maximum dispersion point, between the 3rd dipole magnet ... continued below

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3 pages

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HE,P.; HSEUH,H.C.; RAPARIA,D.; TSOUPAS,N. & WEISS,D. June 18, 2001.

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In the 1MW Spallation Neutron Source (SNS), the High-Energy Beam Transfer line (HEBT) connects the LINAC to the accumulator ring. A major requirement of the SNS complex is to have low uncontrolled beam loss (lnA/m), to allow hands on maintenance. The vacuum requirement for the HEBT is 5x10{sup {minus}8} Torr. Excessive H{sup {minus}} stripping will occur above this pressure and increase losses in the machine. The HEBT is also equipped with three sets of beam halo scrapers, one for momentum and two for transverse collimation. The momentum scraper is located at a maximum dispersion point, between the 3rd dipole magnet (DD3) of HEBT and the 14th quadrupole (Q14) of the HEBT line. The momentum scraper uses movable foils that strip the H{sup {minus}} beam that has momentum spread (0.2%<{delta}p/p<0.6%) into H{sup +}, and the H{sup +} ions are then directed out of the HEBT beam line to a beam dump by the next bending magnet DD4 (4th dipole of HEBT). In order to ensure that the extracted H{sup +} beam travels inside the extraction chamber to minimize the radiation in the beam dump station region, we performed H{sup +} particle tracking to determine the outer boundaries and the angle of the Y-type vacuum chamber that will contain the H{sup +} beam. The development and design of the special HEBT momentum scraper extraction and exit chamber, and the relevant H{sup +} trajectories are presented in this paper.

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3 pages

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INIS; OSTI as DE00782975

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  • PARTICLE ACCELERATOR CONFERENCE 2001, CHICAGO, IL (US), 06/18/2001--06/22/2001

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  • Report No.: BNL--67997
  • Report No.: KC0204019
  • Grant Number: AC02-98CH10886
  • Office of Scientific & Technical Information Report Number: 782975
  • Archival Resource Key: ark:/67531/metadc717345

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  • June 18, 2001

Added to The UNT Digital Library

  • Sept. 29, 2015, 5:31 a.m.

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  • Nov. 10, 2015, 12:32 p.m.

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HE,P.; HSEUH,H.C.; RAPARIA,D.; TSOUPAS,N. & WEISS,D. HEBT MOMENTUM SCRAPER, H+ RAY TRACE SIMULATION AND VACUUM CHAMBER DESIGN., article, June 18, 2001; Upton, New York. (digital.library.unt.edu/ark:/67531/metadc717345/: accessed October 17, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.