Beams Document 1496-v3

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Using Time Separation of Signals to Obtain Independent Proton and Antiproton Beam Position Measurements Around the Tevatron

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Bob Webber
Updated by:
Bob Webber
Document Created:
09 Dec 2004, 17:42
Contents Revised:
06 May 2005, 12:41
Metadata Revised:
06 May 2005, 12:41
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05 May 2005, 15:03
09 Dec 2004, 17:42
Independent position measurement of the counter-circulating proton and antiproton beams in the Tevatron presents a challenge to upgrading the Tevatron Beam Position Monitor (BPM) system. The inherent directionality of the Tevatron BPM pickup design provides 26dB isolation between signals from the two beams. At the present typical 10:1 proton-to-antiproton bunch intensity ratio, this isolation alone is insufficient to support millimeter accuracy antiproton beam position measurements due to interfering proton signals. An accurate and manageable solution to the interfering signal problem is required for antiproton measurements now and, as machine improvements lead to increased antiproton intensity, will facilitate future elimination of antiproton bias on proton beam position measurements. This paper discusses the possibilities and complications of using time separation of the two beam signals at the numerous Tevatron BPM locations and given the dynamic longitudinal conditions of Tevatron operation. Results of measurements results using one such method are presented.
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PAC 2005 held from 16 May 2005 to 20 May 2005 in Knoxville, Tennessee
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