Beams Document 1815-v2

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A BETATRON TUNE FITTING PACKAGE FOR THE TEVATRON 21.4 MHZ SCHOTTKY

Document #:
Beams-doc-1815-v2
Document type:
Poster
Submitted by:
Paul Lebrun
Updated by:
Paul Lebrun
Document Created:
09 May 2005, 08:17
Contents Revised:
09 May 2005, 10:46
Metadata Revised:
09 May 2005, 10:46
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Beams-doc-1815-v1
09 May 2005, 08:17
Abstract:
Accurate control of the Betatron tunes and chromaticities is required to optimize the dynamical
aperture of any large synchrotron. The Fermilab Tevatron is
equipped with two independent Schottky monitors, one operating at 21.4 MHz and the other 1.7 GHz.
While the latter one allows us to characterize individual bunches separated by 396 ns, the former one
has a larger Q and can give precise tune measurements for 53 MHz bunch trains (so called
``un-coalesced" beams). Coherent transverse motions for both types of beams can also be
characterized. A new front-end and related data acquisition for this 21.4 MHz resonator has been
installed and commissioned during the FY04 Collider RunII. Output signal are digitized at 100 KHz.
Frequency spectra are transfered to dedicated server nodes and fitted in real time. Such frequency
spectra are quite complex, due to inherent noise, horizontal/vertical coupling and synchrotron motion.
Sophisticated fitting strategies are required. Optimization of this fitting package on relatively
powerful commodity computer allows us to report tune and chromaticity measurements at almost 1 Hz.
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Associated with Events:
PAC 2005 held from 16 May 2005 to 20 May 2005 in Knoxville, Tennessee
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