Operational experience and techniques for controlled longitudinal phase space dilution in the AGS using a high harmonic cavity

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A fixed frequency 93 MHz harmonic cavity has been installed in the AGS ring. The primary purpose of this harmonic cavity is to increase (dilute) the longitudinal phase space area occupied by the beam by as much as a factor of four (to 4.0 eV-s) in a controlled, rapid manner while maintaining a smooth local density. This then will permit essentially lossless passage through transition energy (8.0 GeV) at intensities higher than previously achieved. Although the system controls permit as many as five dilutions per AGS cycle, only one is used at present. Effects of the various phase modulation programs, ... continued below

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Pages: 4

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Reece, R.K.; Ahrens, L.; Abola, A.; Brennan, J.M.; Cameron, P.; Ciardullo, D. et al. January 1, 1989.

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Description

A fixed frequency 93 MHz harmonic cavity has been installed in the AGS ring. The primary purpose of this harmonic cavity is to increase (dilute) the longitudinal phase space area occupied by the beam by as much as a factor of four (to 4.0 eV-s) in a controlled, rapid manner while maintaining a smooth local density. This then will permit essentially lossless passage through transition energy (8.0 GeV) at intensities higher than previously achieved. Although the system controls permit as many as five dilutions per AGS cycle, only one is used at present. Effects of the various phase modulation programs, excitation period, and rf voltage programs on the dilution rate have been modeled. The parameters predicted to yield the best dilution have been implemented with satisfactory results. Further, a beginning has been made to explore the parameter space experimentally in order to determine the programs leading to the desired of dilution without loss of beam in the minimum time. 5 refs., 5 figs., 4 tabs.

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Pages: 4

Notes

NTIS, PC A02 - OSTI; 3.

Source

  • 13. particle accelerator conference, Chicago, IL, USA, 20 Mar 1989

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  • Other: DE89012537
  • Report No.: BNL-41839
  • Report No.: CONF-890335-126
  • Grant Number: AC02-76CH00016
  • Office of Scientific & Technical Information Report Number: 6296134
  • Archival Resource Key: ark:/67531/metadc1108718

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Office of Scientific & Technical Information Technical Reports

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  • January 1, 1989

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  • Feb. 22, 2018, 7:45 p.m.

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  • April 24, 2018, 12:11 p.m.

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Reece, R.K.; Ahrens, L.; Abola, A.; Brennan, J.M.; Cameron, P.; Ciardullo, D. et al. Operational experience and techniques for controlled longitudinal phase space dilution in the AGS using a high harmonic cavity, article, January 1, 1989; Upton, New York. (digital.library.unt.edu/ark:/67531/metadc1108718/: accessed October 16, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.