Beams Document 841-v4

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Pbar acceleration in MI using 2.5 MHz and 53 MHz rf Systems

Document #:
Beams-doc-841-v4
Document type:
Note
Submitted by:
Chandrashekhara M. Bhat
Updated by:
Chandrashekhara M. Bhat
Document Created:
22 Sep 2003, 17:25
Contents Revised:
28 Jan 2004, 10:25
Metadata Revised:
28 Jan 2004, 10:25
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Beams-doc-841-v7
07 Nov 2005, 13:55
Beams-doc-841-v6
28 Jan 2004, 10:32
Beams-doc-841-v5
28 Jan 2004, 10:29
Beams-doc-841-v3
03 Oct 2003, 13:47
Abstract:
Here we present the results of beam dynamics simulations and beam studies in the Main injector on an 8-150 GeV pbar acceleration scheme. The scheme involves accelerating four 2.5 MHz bunches from 8-27 GeV using the MI 2.5 MHz (h=28) rf system, a harmonic beam transfer at 27 GeV front porch from 2.5 MHz to 53 MHz rf buckets after a bunch rotation and an acceleration from 27-150 GeV using the 53 MHz (h=588) rf system. This scheme is expected to give less than 50% longitudinal emittance growth while the currently used 53 MHz bunch coalescing scheme at 150 GeV which gives rise to an emittance growth in the range of 100-140%. Simulations are carried out for the new acceleration scheme for bunches with emittance in the range 0.8-2.8 eVs/bunch and intensities of 60E9-170E9. The simulations predict about 20% emittance growth. The beam studies have been performed for single and four bunch scenarios in the MI using protons from the Booster for the beam intensity of 20-60E9/bunch and initial longitudinal emittance of 0.8-2 eVs. The outcome of the beam studies is very promising. The data show that acceleration efficiency is about 100%, emittance growth for single-bunch scenario is about 30% and emittance growth for the four-bunch scenario is 45% for beam acceleration from 8 GeV up to the end of the harmonic transfer at 27GeV. The beam studies of acceleration from 27-150 GeV are in progress and we do not expect any emittance growth in this part of the cycle.
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