Beams Document 841-v5

DocDB Home ]  [ Search ] [ Last 20 Days ] [ List Authors ] [ List Topics ] [ List Events ]

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

Document #:
Document type:
Submitted by:
Chandrashekhara M. Bhat
Updated by:
Chandrashekhara M. Bhat
Document Created:
22 Sep 2003, 17:25
Contents Revised:
28 Jan 2004, 10:29
Metadata Revised:
28 Jan 2004, 10:29
Viewable by:
  • Public document
Modifiable by:
  • Same as Viewable by

Quick Links:
Latest Version

Other Versions:
07 Nov 2005, 13:55
28 Jan 2004, 10:32
28 Jan 2004, 10:25
03 Oct 2003, 13:47
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.
Files in Document:
  • .pdf (2pt5mhz-aceleration-doc-v4.pdf, 1.7 MB)
DocDB Home ]  [ Search ] [ Last 20 Days ] [ List Authors ] [ List Topics ] [ List Events ]

DocDB Version 8.8.9, contact Beams Document Database Administrators