LARP LARP Document 358-v1

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Preliminary Studies of a Chromaticity Tracker

Document #:
LARP-doc-358-v1
Document type:
Note
Submitted by:
Cheng-Yang Tan
Updated by:
Cheng-Yang Tan
Document Created:
14 Aug 2006, 07:46
Contents Revised:
14 Aug 2006, 07:46
Metadata Revised:
14 Aug 2006, 07:46
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Abstract:
A chromaticity tracker based on a method by D. McGinnis is
proposed. This method starts with the slow modulation of the accelerating RF
which causes the beam to respond to it. This beam modulation can be detected
transversely with a Schottky pickup which after phase demodulation, the chromaticity
can be calculated from it. However, to perform phase demodulation, the
carrier frequency which is the betatron tune needs to be identi ed. The identi cation
of the carrier frequency falls naturally onto the phase locked loop tune tracker
which when locked to the betatron tune outputs this value in real time.
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