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Application of a new scheme for passing through transition energy to the Fermilab Main Ring and Main Injector [electronic resource].

Published
Washington, D.C. : United States. Dept. of Energy, 1991.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description
Pages: (4 pages) : digital, PDF file
Additional Creators
Fermi National Accelerator Laboratory, United States. Department of Energy, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
In the vicinity of the transition energy of an ion synchrotron the longitudinal oscillation frequency drops and the motion becomes non- adiabatic; the result is emittance dilution. Furthermore, because the synchrotron oscillation is too slow to average particle energy gain, particles off the synchronous phase get to much or too little acceleration depending whether they lead or lag; therefore, momentum spread is increased. In this regime of rf focusing degrades beam quality. Directly J. Griffin has proposed eliminating the rf focusing near transition by flattening the rf waveform with a second or third harmonic component. The rf is phased so that all particles in the bunch are accelerated by the flattened portion, receiving just the acceleration required by the magnet cycle. We will show by concrete examples related to the Fermilab Main Ring (MR) and Main Injector (MI) that one can eliminate rf focusing sufficiently long before and after transition to reduce the maximum momentum spread and emmitance growth significantly. Additionally, the bunch has its maximum phase spread at transition so that the peak current and resulting microwave instability is mitigated, and the bunch above transition becomes a satisfactory match to an accelerating bucket.
Report Numbers
E 1.99:fnal/c-91-131
E 1.99: conf-910505--187
conf-910505--187
fnal/c-91-131
Subject(s)
Other Subject(s)
Note
Published through SciTech Connect.
01/01/1991.
"fnal/c-91-131"
" conf-910505--187"
"DE91013675"
1991 Institute of Electrical and Electronics Engineers (IEEE) particle accelerator conference (PAC), San Francisco, CA (USA), 6-9 May 1991.
Griffin, J.E.; MacLachlan, J.A.
Funding Information
AC02-76CH03000
View MARC record | catkey: 14696076