Beams Document 1157-v1

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Redefining MI 8 GeV Energy, a Proposal

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Submitted by:
David E. Johnson
Updated by:
David E. Johnson
Document Created:
04 May 2004, 11:55
Contents Revised:
04 May 2004, 11:55
Metadata Revised:
04 May 2004, 16:55
Actually Revised:
26 Sep 2006, 16:55
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It has long been accepted that the permanent magnet Recycler ring will define the 8 GeV energy of the accelerator complex. Currently, the Accumulator energy on the extraction orbit defines the 8 GeV energy of the MI and hence that of the Booster and 8 GeV line.
In this proposal, the MI injection momentum and frequency will be defined to match that of the Recycler but does not require any changes to the Accumulator. In this scheme, a Main Injector “mini-ramp” (or front porch in the case of a $2A) is matched to the current Accumulator energy. The original description of this scheme and motivation is in Beams-doc-1140 when the Recycler was in proton mode a significant portion of the time and this proposal was viewed as a means to minimize impact on stacking (and save the pbar tax).
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