Antiproton acceleration in the Main Injector with RF at harmonic number h=28 or h=84

MacLachlan, J.A.

Fermi National Accelerator Laboratory

关键词: Acceleration;    Cavities;    Rf Systems;    43 Particle Accelerators;    Fermilab Tevatron;   

DOI  :  10.2172/795913
RP-ID  :  FERMILAB-TM-2177
RP-ID  :  AC02-76CH03000
RP-ID  :  795913

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来源: UNT Digital Library

【 摘 要 】

Antiproton bunches of 1.5 eVs are required for the Tevatron but can not be accelerated through transition in the Main Injector (MI) with the h=588 rf system. Chandra Bhat has developed parameters for h=28 acceleration from 8 GeV followed by h=588 acceleration from 25 to 150 GeV.[1] This note refines the h=28 scenario and also adapts it to the h=84 case needed for 132 ns separation. It is practicable to accelerate the 1.5 eVs {bar p} bunches in about seven seconds with no loss and less than ten percent emittance growth using the existing 2.5 MHz cavities. Both the cycle time and emittance growth are significantly improved by the scheme described in this note. Excellent results can be obtained for the 7.5 MHz case with only 75 kV except that there is a 0.5 % beam loss. For completely clean 53 MHz capture of the tail produced by shape mismatch at transition, 250 kV is desirable for bunch rotation at 26 GeV.