Main Ring bunch spreaders: Past, 1987/1988 fixed target run, and proposed future

Technical Report · Sun Feb 26 04:00:00 EST 1989

DOI:https://doi.org/10.2172/6296115· OSTI ID:6296115

Jackson, G P

During the last 1987--1988 fixed target running period beam intensity was limited many times by coherent instabilities in both the Main Ring and in the Tevatron. The intensity thresholds for instabilities are generally inversely proportional to the proton bunch length. Since fixed target operations are insensitive to the longitudinal phase space emittance of the beam, bunch spreaders are employed to increase this emittance, and hence the bunch length. As a result, more beam intensity can be delivered to the fixed target experiments. This paper starts with a short history behind the old Main Ring bunch spreader. After discussing the physics of stimulated emittance growth, the design and performance of the 1987--1988 fixed target run Main Ring bunch spreader is discussed. Finally, designs of improved Main Ring and Tevatron bunch spreaders for the next fixed target run are proposed. 23 figs.

• Research Organization: Fermi National Accelerator Lab., Batavia, IL (USA)
• DOE Contract Number: AC02-76CH03000
• OSTI ID: 6296115
• Report Number(s): FNAL-TM-1572; ON: DE89011295
• Country of Publication: United States
• Language: English

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ACCELERATORS
BEAM BUNCHERS
BEAM BUNCHING
BEAM DYNAMICS
BEAM EMITTANCE
BEAM SHAPING
CYCLIC ACCELERATORS
DESIGN
FERMILAB TEVATRON
INSTABILITY
MATHEMATICAL SPACE
PERFORMANCE
PHASE SPACE
SPACE
SYNCHROTRONS