Beams Document 1838-v1

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Studies of the Chromaticity, Tune, and Coupling Drift in the Tevatron

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Michael A. Martens
Updated by:
Michael A. Martens
Document Created:
22 May 2005, 17:15
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22 May 2005, 17:15
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22 May 2005, 17:15
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Chromaticity drift is a well-known and more or less well-understood phenomenon in superconducting colliders such as the Tevatron. Less known is the effect of tune and coupling drift, also observed in the Tevatron during injection. These effects are caused by field drifts in the superconducting magnets. Controlling the behavior of the tune, coupling, and chromaticity is an important part of reducing beam loss at injection and at the start of the Tevatron ramp. In this context we conducted several beam-studies during the period of April to August 2004 in which we measured the drift in the Tevatron chromaticity, tunes, and coupling during the injection porch. In some cases we also measured the snapback at the start of the ramp. We will present the results of these studies data and put them into context of the results of off-line magnetic measurements conducted in spare Tevatron dipoles.
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PAC 2005 held from 16 May 2005 to 20 May 2005 in Knoxville, Tennessee
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