Debuncher Energy Mismatch

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Description

During the December 1999 startup of antiproton stacking, a quick measurement of the Debuncher momentum aperture was made. The measurement was done by turning off and de-tuning the Debuncher bunch rotation cavities and observing the Debuncher 75 MHz longitudinal schottky signal of the circulating antiprotons as shown in Figure 1. The frequency at the center of the plot corresponds to the rotation frequency of the Debuncher RF cavities. (The schottky signal and the bunch rotation frequency occur at the 127th and 90th harmonics of the revolution frequency, respectively.) Figure 1 shows that the Debuncher bunch rotation energy is offset from ... continued below

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7 pages

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McGinnis, Dave January 25, 2000.

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Description

During the December 1999 startup of antiproton stacking, a quick measurement of the Debuncher momentum aperture was made. The measurement was done by turning off and de-tuning the Debuncher bunch rotation cavities and observing the Debuncher 75 MHz longitudinal schottky signal of the circulating antiprotons as shown in Figure 1. The frequency at the center of the plot corresponds to the rotation frequency of the Debuncher RF cavities. (The schottky signal and the bunch rotation frequency occur at the 127th and 90th harmonics of the revolution frequency, respectively.) Figure 1 shows that the Debuncher bunch rotation energy is offset from the middle of the Debuncher momentum aperture by about 0.7% (57 MeV). The measured value of momentum aperture using the width of the base of the signal shown in Figure 1 ({eta} = 0.006 ) is 3.9% (346 MeV). This is close to the design value of 4%, so the offset is probably not due to any asymmetric momentum aperture restrictions.

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7 pages

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  • Report No.: FERMILAB-PBAR-NOTE-629
  • Grant Number: AC02-07CH11359
  • DOI: 10.2172/984606 | External Link
  • Office of Scientific & Technical Information Report Number: 984606
  • Archival Resource Key: ark:/67531/metadc1012425

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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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Creation Date

  • January 25, 2000

Added to The UNT Digital Library

  • Oct. 14, 2017, 8:36 a.m.

Description Last Updated

  • Nov. 3, 2017, 9:28 p.m.

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McGinnis, Dave. Debuncher Energy Mismatch, report, January 25, 2000; Batavia, Illinois. (digital.library.unt.edu/ark:/67531/metadc1012425/: accessed October 17, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.