Beams Document 989-v1

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RESULTS OF AN INVESTIGATION OF THE SKEW QUADRUPOLE ISSUE IN TEVATRON DIPOLES

Document #:
Beams-doc-989-v1
Document type:
Publication
Submitted by:
Ray Stefanski
Updated by:
Ray Stefanski
Document Created:
02 Feb 2004, 10:36
Contents Revised:
02 Feb 2004, 10:36
Metadata Revised:
18 Feb 2004, 10:42
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Abstract:
Analysis of the corrector settings and beam studies revealed strong coupling in the Tevatron proton antiproton collider, currently in its collider run II stage. Beam tracking indicates that the coupling is distributed more or less evenly over the ring and could be explained by a skew quadrupole field component of approximately one unit in all Tevatron dipole magnets. Such a skew quadrupole field component was not present in the Tevatron dipole magnets at the time of installation. Hints were found, however, that a systematic, vertical downward shift of the coils within the (warm) iron yoke occurred in the dipole magnets over time. The dropping of the coils within the yoke generated a skew quadrupole moment in the magnet bore.
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