Study of Collective Effects for the PEP Low-Emittance Optics

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Experimental studies have been performed on the PEP storage ring run at 7.1 GeV in the low-emittance mode. The motivation for this work is to explore the capability of PEP as a dedicated synchrotron radiation source. The long straight sections and low emittance available at PEP make its use for this purpose very attractive, and would produce a source of very high brightness x-ray beams for the scientific community. During the studies, single-bunch current limitations were measured as a function of RF voltage. Thresholds were in the range of 1-2 mA per bunch, which is lower than expected based upon ... continued below

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Zisman, M.S.; Borland, M.; Galayda, J.; Jackson, A.; Kramer, S. & Winick, H. July 1, 1988.

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Experimental studies have been performed on the PEP storage ring run at 7.1 GeV in the low-emittance mode. The motivation for this work is to explore the capability of PEP as a dedicated synchrotron radiation source. The long straight sections and low emittance available at PEP make its use for this purpose very attractive, and would produce a source of very high brightness x-ray beams for the scientific community. During the studies, single-bunch current limitations were measured as a function of RF voltage. Thresholds were in the range of 1-2 mA per bunch, which is lower than expected based upon transverse impedance estimates from the PEP collider optics. An increase in threshold current by about 50% was realized by modifying the optics to reduce the magnitude of the horizontal beta functions in the straight sections and at the RF locations. The reason for the lower than expected thresholds has not been resolved. To permit its effective use as a synchrotron radiation source, a beam current of 50-100 mA is desired, which will require that PEP be run in the multibunch mode. Our goal in this study was to investigate the multibunch operating mode to ascertain that reasonable beam intensities were possible. By utilizing many low intensity (0.1-0.25 mA) bunches, stable and reproducible currents of 15-20 mA were achieved. In an attempt to improve this value, one of the idle RF stations was operated in a tune-splitting mode, with only partial success. By adjusting the tuner positions of the unused RF stations, up to 33 mA was ultimately stored, albeit with some evidence for instability. Possible approaches to improving the multibunch stability are discussed.

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  • Report No.: LBL-25582
  • Grant Number: DE-AC02-05CH11231
  • DOI: 10.2172/1000485 | External Link
  • Office of Scientific & Technical Information Report Number: 1000485
  • Archival Resource Key: ark:/67531/metadc838128

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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.

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  • July 1, 1988

Added to The UNT Digital Library

  • May 19, 2016, 3:16 p.m.

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  • June 15, 2016, 9:42 p.m.

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Zisman, M.S.; Borland, M.; Galayda, J.; Jackson, A.; Kramer, S. & Winick, H. Study of Collective Effects for the PEP Low-Emittance Optics, report, July 1, 1988; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc838128/: accessed June 24, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.