BOOSTER GOLD BEAM INJECTION EFFICIENCY AND BEAM LOSS

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The Relativistic Heavy Ion Collider (RHIC) at the BNL requires the AGS to provide Gold beam with the intensity of 10{sup 9} ions per bunch. Over the years, the Tandem Van de Graaff has provided steadily increasing intensity of gold ion beams to the AGS Booster. However, the gold beam injection efficiency at the Booster has been found to decrease with the rising intensity of injected beams. As the result, for Tandem beams of the highest intensity, the Booster late intensity is lower than with slightly lower intensity Tandem beam. In this article, the authors present two experiments associated with ... continued below

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ZHANG,S.Y. & AHRENS,L.A. June 22, 1998.

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Description

The Relativistic Heavy Ion Collider (RHIC) at the BNL requires the AGS to provide Gold beam with the intensity of 10{sup 9} ions per bunch. Over the years, the Tandem Van de Graaff has provided steadily increasing intensity of gold ion beams to the AGS Booster. However, the gold beam injection efficiency at the Booster has been found to decrease with the rising intensity of injected beams. As the result, for Tandem beams of the highest intensity, the Booster late intensity is lower than with slightly lower intensity Tandem beam. In this article, the authors present two experiments associated with the Booster injection efficiency and beam intensity. One experiment looks at the Booster injection efficiency by adjusting the Tandem beam intensity, and another looks at the beam life time while scraping the beam in the Booster. The studies suggest that the gold beam injection efficiency at the AGS Booster is related to the beam loss in the ring, rather than the intensity of injected beam or circulating beam. A close look at the effect of the lost gold ion at the Booster injection leads to the prediction that the lost gold ion creates large number of positive ions, and even larger number of electrons. The lost gold beam is also expected to create large numbers of neutral particles. In 1998 heavy ion run, the production of positive ions and electrons due to the lost gold beam has been observed. Also the high vacuum pressure due to the beam loss, presumably because of the neutral particles it created, has been measured. These results will be reported elsewhere.

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3 pages

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INIS; OSTI as DE00757115

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  • EUROPEAN PARTICLE ACCELERATOR CONFERENCE, STOCKHOLM (SE), 06/22/1998--06/26/1998

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  • Report No.: BNL--65643
  • Report No.: KA0403
  • Grant Number: AC02-98CH10886
  • Office of Scientific & Technical Information Report Number: 757115
  • Archival Resource Key: ark:/67531/metadc704257

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • June 22, 1998

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  • Sept. 12, 2015, 6:31 a.m.

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  • Nov. 6, 2015, 10:54 p.m.

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ZHANG,S.Y. & AHRENS,L.A. BOOSTER GOLD BEAM INJECTION EFFICIENCY AND BEAM LOSS, article, June 22, 1998; Upton, New York. (digital.library.unt.edu/ark:/67531/metadc704257/: accessed May 22, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.