Design of the RF cavity and power amplifier for the Fermilab antiproton source

Journal Article · Mon Aug 01 04:00:00 EDT 1983 · IEEE Trans. Nucl. Sci.; (United States)

DOI:https://doi.org/10.1109/TNS.1983.4336682· OSTI ID:6689514

Griffin, J E; MacLachlan, J A; Moretti, A

In the Fermilab program for production of an intense antiproton beam, trains of 82 short antiproton bunches (1 nsec) separated by 18.8 nsec are produced with a large momentum spread about a mean energy of 8.9 GeV. The bunch trains are delivered to a Debuncher ring where a 3% momentum bite is reduced to about 0.2% by exchanging momentum spread for time spread. This exchange is a two step process involving synchrotron rotation of the bunches in mismatched buckets followed by adiabatic debunching. During the bunch rotation the rf system is required to provide a stable rf voltage of 5 MV at 53.1035 MHz for 60 251sec, or about 35 turns. Then the voltage must be lowered to 98 kV within about 56 251sec to match the rotated distribution. The voltage is then reduced to 5 kV in about 12 msec for final adiabatic debunching of the antiprotons. The process is repeated at a 2 second repetition rate. The rf voltage is to be generated by eight rf cavities in a long straight section. Each cavity, when excited with 112 KW of rf power, will generate a peak voltage of 625 kV. Each cavity is excited by a self contained power amplifier mounted directly on top of the cavity to minimize rf interference with nearby high sensitivity stochastic cooling systems. The cavity, 90.9 cm dia. and 182.6 cm long, is made of aluminum and completely evacuated. The rf power is fed into the cavity through ceramic vacuum feedthrus through a top plate. Details of the cavity and amplifier design as well as prototype cavity measurement are presented.

• Research Organization: Fermi Nat.'l Accelerator Lab., P.O. Box 500, Batavia, IL 60510
• OSTI ID: 6689514
• 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

Related Subjects

43 PARTICLE ACCELERATORS
430303* -- Particle Accelerators-- Experimental Facilities & Equipment
ACCELERATORS
ADIABATIC PROCESSES
AMPLIFIERS
ANTINUCLEON BEAMS
ANTIPARTICLE BEAMS
ANTIPROTON BEAMS
BEAM BUNCHERS
BEAM BUNCHING
BEAM COOLING
BEAM DYNAMICS
BEAM PRODUCTION
BEAM SHAPING
BEAMS
CAVITY RESONATORS
CYCLIC ACCELERATORS
DESIGN
ELECTRIC POTENTIAL
ELECTRONIC EQUIPMENT
ENERGY RANGE
EQUIPMENT
FERMILAB ACCELERATOR
FREQUENCY RANGE
GEV RANGE
GEV RANGE 01-10
MHZ RANGE
MHZ RANGE 01-100
OSCILLATIONS
POWER AMPLIFIERS
RESONATORS
RF SYSTEMS
STOCHASTIC COOLING
STORAGE RINGS
SYNCHROTRON OSCILLATIONS
SYNCHROTRONS