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Title: RF exercises associated with acceleration of intense antiproton bunches at Fermilab

Abstract

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 intomore » 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.« less

Authors:
; ;
Publication Date:
Research Org.:
Fermilab, P.O. Box 500, Batavia, IL 60510
OSTI Identifier:
5654998
Report Number(s):
CONF-830311-
Journal ID: CODEN: IETNA; TRN: 84-000711
Resource Type:
Conference
Journal Name:
IEEE Trans. Nucl. Sci.; (United States)
Additional Journal Information:
Journal Volume: NS-30:4; Conference: Particle accelerator conference, Santa Fe, NM, USA, 21 Mar 1983
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; TEVATRON; ANTIPROTON BEAMS; BEAM BUNCHING; ACCUMULATORS; BEAM EMITTANCE; BEAM EXTRACTION; BEAM STACKING; COLLIDING BEAMS; FERMILAB ACCELERATOR; GEV RANGE 01-10; HARMONICS; LINE NARROWING; PERFORMANCE TESTING; RF SYSTEMS; SIMULATION; STORAGE RINGS; ACCELERATORS; ANTINUCLEON BEAMS; ANTIPARTICLE BEAMS; BEAM DYNAMICS; BEAMS; CONTAINERS; CYCLIC ACCELERATORS; ENERGY RANGE; GEV RANGE; OSCILLATIONS; SYNCHROTRONS; TANKS; TESTING; 430400* - Particle Accelerators- Storage Rings; 430200 - Particle Accelerators- Beam Dynamics, Field Calculations, & Ion Optics

Citation Formats

Griffin, J E, MacLaclan, J A, and Qian, Z B. RF exercises associated with acceleration of intense antiproton bunches at Fermilab. United States: N. p., 1983. Web.
Griffin, J E, MacLaclan, J A, & Qian, Z B. RF exercises associated with acceleration of intense antiproton bunches at Fermilab. United States.
Griffin, J E, MacLaclan, J A, and Qian, Z B. Mon . "RF exercises associated with acceleration of intense antiproton bunches at Fermilab". United States.
@article{osti_5654998,
title = {RF exercises associated with acceleration of intense antiproton bunches at Fermilab},
author = {Griffin, J E and MacLaclan, J A and Qian, Z B},
abstractNote = {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.},
doi = {},
url = {https://www.osti.gov/biblio/5654998}, journal = {IEEE Trans. Nucl. Sci.; (United States)},
number = ,
volume = NS-30:4,
place = {United States},
year = {1983},
month = {8}
}

Conference:
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