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Title: Bunch-by-bunch measurement of transverse coherent beam-beam modes in the Fermilab Tevatron collider

Journal Article · · Phys.Rev.ST Accel.Beams
ORCiD logo [1]; ORCiD logo [1]
  1. Fermilab
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A system for bunch-by-bunch detection of transverse proton and antiproton coherent oscillations in the Tevatron is described. It is based on the signal from a single beam-position monitor located in a region of the ring with large amplitude functions. The signal is digitized over a large number of turns and Fourier-analyzed offline with a dedicated algorithm. To enhance the signal, band-limited noise is applied to the beam for about 1 s. This excitation does not adversely affect the circulating beams even at high luminosities. The device has a response time of a few seconds, a frequency resolution of 1.6e-5 in fractional tune, and it is sensitive to oscillation amplitudes of 60 nm. It complements Schottky detectors as a diagnostic tool for tunes, tune spreads, and beam-beam effects. Measurements of coherent mode spectra are presented to show the effects of betatron tunes, beam-beam parameter, and collision pattern, and to provide an experimental basis for beam-beam numerical codes. Comparisons with a simplified model of beam-beam oscillations are also described.

Research Organization:
Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP)
DOE Contract Number:
AC02-07CH11359
OSTI ID:
1967405
Report Number(s):
FERMILAB-PUB-11-181-APC; arXiv:1104.4366; oai:inspirehep.net:897038
Journal Information:
Phys.Rev.ST Accel.Beams, Vol. 15
Country of Publication:
United States
Language:
English

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