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

Abstract

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 containedmore » 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.« less

Authors:
; ;
Publication Date:
Research Org.:
Fermi Nat.'l Accelerator Lab., P.O. Box 500, Batavia, IL 60510
OSTI Identifier:
6689514
Resource Type:
Journal Article
Journal Name:
IEEE Trans. Nucl. Sci.; (United States)
Additional Journal Information:
Journal Volume: NS-30:4
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; ANTIPROTON BEAMS; BEAM BUNCHING; BEAM PRODUCTION; FERMILAB ACCELERATOR; BEAM BUNCHERS; CAVITY RESONATORS; POWER AMPLIFIERS; ADIABATIC PROCESSES; BEAM SHAPING; DESIGN; ELECTRIC POTENTIAL; GEV RANGE 01-10; MHZ RANGE 01-100; RF SYSTEMS; STOCHASTIC COOLING; STORAGE RINGS; SYNCHROTRON OSCILLATIONS; ACCELERATORS; AMPLIFIERS; ANTINUCLEON BEAMS; ANTIPARTICLE BEAMS; BEAM COOLING; BEAM DYNAMICS; BEAMS; CYCLIC ACCELERATORS; ELECTRONIC EQUIPMENT; ENERGY RANGE; EQUIPMENT; FREQUENCY RANGE; GEV RANGE; MHZ RANGE; OSCILLATIONS; RESONATORS; SYNCHROTRONS; 430303* - Particle Accelerators- Experimental Facilities & Equipment

Citation Formats

Griffin, J E, MacLachlan, J A, and Moretti, A. Design of the RF cavity and power amplifier for the Fermilab antiproton source. United States: N. p., 1983. Web. doi:10.1109/TNS.1983.4336682.
Griffin, J E, MacLachlan, J A, & Moretti, A. Design of the RF cavity and power amplifier for the Fermilab antiproton source. United States. https://doi.org/10.1109/TNS.1983.4336682
Griffin, J E, MacLachlan, J A, and Moretti, A. Mon . "Design of the RF cavity and power amplifier for the Fermilab antiproton source". United States. https://doi.org/10.1109/TNS.1983.4336682.
@article{osti_6689514,
title = {Design of the RF cavity and power amplifier for the Fermilab antiproton source},
author = {Griffin, J E and MacLachlan, J A and Moretti, A},
abstractNote = {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.},
doi = {10.1109/TNS.1983.4336682},
url = {https://www.osti.gov/biblio/6689514}, journal = {IEEE Trans. Nucl. Sci.; (United States)},
number = ,
volume = NS-30:4,
place = {United States},
year = {1983},
month = {8}
}