Observations of bunch lengthening effects in the APS 7-GeV storage ring

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Measurements of the bunch length and horizontal beam size at a dispersive point in the lattice versus single-bunch current have been done on the Advanced Photo Source (APS) 7-GeV storage ring. These data are relevant to issues (limits) of obtaining high peak currents for storage-ring-based FELs. Bunch lengths from {sigma}{sub {tau}} {approx} 25 to 70 ps were measured using a Hamamatsu C5680 dual-sweep streak camera. Additional complementary data on energy spread deduced from horizontal beam size at a dispersive point in the lattice were also tracked versus single-bunch current. Both optical synchrotron radiation (OSR) and x-ray synchrotron radiation (XSR) techniques ... continued below

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21 pages

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Lumpkin, A.H.; Yang, B.X. & Chae, Y.C. December 31, 1996.

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Description

Measurements of the bunch length and horizontal beam size at a dispersive point in the lattice versus single-bunch current have been done on the Advanced Photo Source (APS) 7-GeV storage ring. These data are relevant to issues (limits) of obtaining high peak currents for storage-ring-based FELs. Bunch lengths from {sigma}{sub {tau}} {approx} 25 to 70 ps were measured using a Hamamatsu C5680 dual-sweep streak camera. Additional complementary data on energy spread deduced from horizontal beam size at a dispersive point in the lattice were also tracked versus single-bunch current. Both optical synchrotron radiation (OSR) and x-ray synchrotron radiation (XSR) techniques were used. For the set of data taken at a synchrotron frequency of 1.2 kHz (indicating rf gap voltage {<=} 6 MV), the significant bunch lengthening without a comparable horizontal size change ({Delta}E growth) is consistent with the potential well distortion model rather than the predictions of a microwave instability calculation. With higher rf gap voltage, peak currents up to 400 A were observed. A bunch-lengthening effect in multibunch mode was also observed as the stored-beam current approached the available rf power limit.

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21 pages

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OSTI as DE00432947

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  • Other Information: Supercedes reports DE00432947 and DE97001012; PBD: 31 Dec 1996

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  • Other: DE97001012
  • Report No.: ANL/ASD/CP--90147
  • Report No.: CONF-9608133--15
  • Grant Number: W-31109-ENG-38
  • DOI: 10.2172/432947 | External Link
  • Office of Scientific & Technical Information Report Number: 432947
  • Archival Resource Key: ark:/67531/metadc688899

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  • December 31, 1996

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  • July 25, 2015, 2:20 a.m.

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  • Dec. 16, 2015, 6:37 p.m.

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Lumpkin, A.H.; Yang, B.X. & Chae, Y.C. Observations of bunch lengthening effects in the APS 7-GeV storage ring, report, December 31, 1996; Illinois. (digital.library.unt.edu/ark:/67531/metadc688899/: accessed September 24, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.