Recent Measurement of Debuncher Longitudinal Beam Size During Stacking

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During the recent co11ider studies period there were a few time periods when 120 GeV beam was delivered with a slow repetition rate. This gave us a rare chance to study the effectiveness of additional cooling in the antiproton source. The measurements shown below were taken on 1/15/92. Although we have several FFT analyzers connected to the debuncher schottkey monitor we cannot readout the measured spectrum except with a TV camera. The following measurements, therefore, were taken with a spectrum analyzer. It is necessary to use a resolution bandwidth of 100 HZ to see the effectiveness of the momentum cooling ... continued below

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9 pages

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Halling, Mike February 18, 1992.

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Description

During the recent co11ider studies period there were a few time periods when 120 GeV beam was delivered with a slow repetition rate. This gave us a rare chance to study the effectiveness of additional cooling in the antiproton source. The measurements shown below were taken on 1/15/92. Although we have several FFT analyzers connected to the debuncher schottkey monitor we cannot readout the measured spectrum except with a TV camera. The following measurements, therefore, were taken with a spectrum analyzer. It is necessary to use a resolution bandwidth of 100 HZ to see the effectiveness of the momentum cooling system, and therefore the sweep time was 3 seconds. It took about 1 hour to complete the series of measurements. The main ring performance was up to it's normal standards during this time period, but it's performance can vary greatly from on minute to the next. The debuncher longitudinal schottkey spectra are shown in Figures 1-5 with different trigger times for the spectrum analyzer. These are shown using a scale linear in power, which should also be linear in particle density. There are two effects of momentum cooling that are apparent. (1) The momentum distribution after bunch rotation has very long non-gaussian tails, momentum cooling rapidly pushes these tails into the central peak. (2) The width of the central peak is gradually reduced, as is shown in Table I. The FWHM shown in TABLE I is at h=127, and the 95% dp/p is the full width in percent dp/p that contains 95% of the beam.

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9 pages

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  • Report No.: FERMILAB-PBAR-NOTE-526
  • Grant Number: AC02-07CH11359
  • DOI: 10.2172/983959 | External Link
  • Office of Scientific & Technical Information Report Number: 983959
  • Archival Resource Key: ark:/67531/metadc1015071

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • February 18, 1992

Added to The UNT Digital Library

  • Oct. 14, 2017, 8:36 a.m.

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  • Oct. 24, 2017, 9:58 p.m.

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Halling, Mike. Recent Measurement of Debuncher Longitudinal Beam Size During Stacking, report, February 18, 1992; Batavia, Illinois. (digital.library.unt.edu/ark:/67531/metadc1015071/: accessed June 22, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.