Beams Document 1819-v2

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BETA FUNCTION MEASUREMENT IN THE TEVATRON USING QUADRUPOLE GRADIENT MODULATION

Document #:
Beams-doc-1819-v2
Document type:
Proceeding
Submitted by:
Andreas Jansson
Updated by:
Andreas Jansson
Document Created:
12 May 2005, 05:42
Contents Revised:
17 Jun 2005, 15:18
Metadata Revised:
17 Jun 2005, 15:18
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Beams-doc-1819-v1
12 May 2005, 05:42
Abstract:
Early in Run2, there was an effort to compare the different emittance measurements
in the Tevatron (flying wires and synchtotron light) and understand the origin of
the observed differences. To measure the beta function at a few key locations near
the instruments, air-core quadrupoles were installed. By modulating the gradient of
these magnets and measuring the effect on the tune, the lattice parameters can be
extracted. Initially, the results seem to disagree with with other methods. At the
time, the lattice was strongly coupled due to a skew component in the main dipoles,
caused by sagging of the cryostat. After a large fraction of the superconducting
magnets were shimmed to remove a strong skew quadrupole component, the results now
agree with the theoretical values to within 20%.
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Topics:
None
Notes and Changes:
Fixed a minor typo caught by the FNAL Technical Memo reviewer (after the conference).
Associated with Events:
PAC 2005 held from 16 May 2005 to 20 May 2005 in Knoxville, Tennessee
Publication Information:
2005 Particle Accelerator Conference, Knoxville, TN.
FERMILAB-CONF-05-171-AD
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