MEASURING CHROMATICITY ALONG THE RAMP USING THE PLL TUNE METER IN RHIC.

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Beam stability up the ramp requires the appropriate sign and magnitude of the chromaticity. We developed a way to measure the chromaticity using the PLL (Phase Locked Loop) tune-meter. Since, the accuracy of the PLL tune-meter with properly adjusted loop gain is better than {approx} 0.0001 in tune units, the radial loop needs only be changed by a small amount of 0.2mm at a 1Hz rate. Thus, we can achieve fast chromaticity measurements in 1 sec. Except during the very beginning of the ramp where there are snapback effects and the gamma changes very rapidly, we can have good chromaticcity ... continued below

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3 pages

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TEPIKIAN,S.; AHRENS,L.; CAMERON,P. & SCHULTHEISS,C. June 2, 2002.

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Beam stability up the ramp requires the appropriate sign and magnitude of the chromaticity. We developed a way to measure the chromaticity using the PLL (Phase Locked Loop) tune-meter. Since, the accuracy of the PLL tune-meter with properly adjusted loop gain is better than {approx} 0.0001 in tune units, the radial loop needs only be changed by a small amount of 0.2mm at a 1Hz rate. Thus, we can achieve fast chromaticity measurements in 1 sec. Except during the very beginning of the ramp where there are snapback effects and the gamma changes very rapidly, we can have good chromaticcity measurements along the ramp. This leads to the possibility of correcting the chromaticity during the ramp using a feedback system.

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3 pages

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  • 2002 PARTICLE ACCELERATOR CONFERENCE, PARIS (FR), 06/02/2002--06/07/2002

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  • Report No.: BNL--69228
  • Grant Number: AC02-98CH10886
  • Office of Scientific & Technical Information Report Number: 798556
  • Archival Resource Key: ark:/67531/metadc734278

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  • June 2, 2002

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  • Oct. 19, 2015, 7:39 p.m.

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  • Nov. 9, 2015, 8:09 p.m.

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TEPIKIAN,S.; AHRENS,L.; CAMERON,P. & SCHULTHEISS,C. MEASURING CHROMATICITY ALONG THE RAMP USING THE PLL TUNE METER IN RHIC., article, June 2, 2002; Upton, New York. (digital.library.unt.edu/ark:/67531/metadc734278/: accessed December 10, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.