RF exercises associated with acceleration of intense antiproton bunches at Fermilab
Antiprotons for the Fermilab p/sup -/p colliding beam project (Tevatron I) will be extracted from an 8 GeV accumulation ring in a few (1 to 3) bunches of about 10/sup 11/, a single bunch at a time. To preserve the stack as a source of subsequent bunches, each bunch will be removed from the dense core of the stack with an isolated bucket at harmonic number h = 2. The longitudinal emittance of the bunches will be in range 1.5 to 2.0 eV, roughly five times what the Main Ring usually accelerates with the installed 53 MHz rf system. Therefore, the bunch is to be narrowed on the Accumulator extraction orbit to match a 2.5 MHz bucket in the Main Ring. By raising the 2.5 MHz voltage (harmonic number h = 53), the bunch will be further narrowed in the Main Ring to span seven buckets of the principal system (h = 1113). The bunch will then be captured adiabaically from the h = 53 bucket into seven adjacent h = 1113 buckets for acceleration to a 150 GeV flattop. At this energy the 2.5 MHz and 53 MHz systems will be used jointly to coalesce the seven bunches into a single h = 1113 bucket for injection into the Energy Doubler. This paper describes unstacking in the Accumulator, the adiabatic capture into seven bunches in the Main Ring, and the coalescing of the seven back into one bunch at 150 GeV. The expected performance of the whole sequence has been established by detailed particle tracking simulation, and tests of some phases have been made in the Main Ring.
- Research Organization:
- Fermilab, P.O. Box 500, Batavia, IL 60510
- OSTI ID:
- 5654998
- Report Number(s):
- CONF-830311-
- Journal Information:
- IEEE Trans. Nucl. Sci.; (United States), Journal Name: IEEE Trans. Nucl. Sci.; (United States) Vol. NS-30:4; ISSN IETNA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
430200 -- Particle Accelerators-- Beam Dynamics
Field Calculations
& Ion Optics
430400* -- Particle Accelerators-- Storage Rings
ACCELERATORS
ACCUMULATORS
ANTINUCLEON BEAMS
ANTIPARTICLE BEAMS
ANTIPROTON BEAMS
BEAM BUNCHING
BEAM DYNAMICS
BEAM EMITTANCE
BEAM EXTRACTION
BEAM STACKING
BEAMS
COLLIDING BEAMS
CONTAINERS
CYCLIC ACCELERATORS
ENERGY RANGE
FERMILAB ACCELERATOR
GEV RANGE
GEV RANGE 01-10
HARMONICS
LINE NARROWING
OSCILLATIONS
PERFORMANCE TESTING
RF SYSTEMS
SIMULATION
STORAGE RINGS
SYNCHROTRONS
TANKS
TESTING
TEVATRON