Streak-Camera Measurements with High Currents in PEP-II and Variable Optics in SPEAR3

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A dual-axis, synchroscan streak camera was used to measure longitudinal bunch profiles in three storage rings at SLAC: the PEP-II low- and high-energy rings, and SPEAR3. At high currents, both PEP rings exhibit a transient synchronous-phase shift along the bunch train due to RF-cavity beam loading. Bunch length and profile asymmetry were measured along the train for a range of beam currents. To avoid the noise inherent in a dual-axis sweep, we accumulated single-axis synchroscan images while applying a 50-ns gate to the microchannel plate. To improve the extinction ratio, an upstream mirror pivoting at 1 kHz was synchronized with ... continued below

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5 pages

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Cheng, Weixeng; Fisher, Alan & Corbett, Jeff June 5, 2008.

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A dual-axis, synchroscan streak camera was used to measure longitudinal bunch profiles in three storage rings at SLAC: the PEP-II low- and high-energy rings, and SPEAR3. At high currents, both PEP rings exhibit a transient synchronous-phase shift along the bunch train due to RF-cavity beam loading. Bunch length and profile asymmetry were measured along the train for a range of beam currents. To avoid the noise inherent in a dual-axis sweep, we accumulated single-axis synchroscan images while applying a 50-ns gate to the microchannel plate. To improve the extinction ratio, an upstream mirror pivoting at 1 kHz was synchronized with the 2kHz MCP gate to deflect light from other bunches off the photocathode. Bunch length was also measured on the HER as a function of beam energy. For SPEAR3 we measured bunch length as a function of single-bunch current for several lattices: achromatic, low-emittance and low momentum compaction. In the first two cases, resistive and reactive impedance components can be extracted from the longitudinal bunch profiles. In the low-alpha configurations, we observed natural bunch lengths approaching the camera resolution, requiring special care to remove instrumental effects, and saw evidence of periodic bursting.

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5 pages

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  • Presented at 13th Beam Instrumentation Workshop (BIW08), Lake Tahoe, California, 4-8 May 2008

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  • Report No.: SLAC-PUB-13248
  • Grant Number: AC02-76SF00515
  • Office of Scientific & Technical Information Report Number: 929286
  • Archival Resource Key: ark:/67531/metadc899505

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  • June 5, 2008

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  • Sept. 27, 2016, 1:39 a.m.

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  • Sept. 26, 2017, 3:38 p.m.

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Cheng, Weixeng; Fisher, Alan & Corbett, Jeff. Streak-Camera Measurements with High Currents in PEP-II and Variable Optics in SPEAR3, article, June 5, 2008; [Menlo Park, California]. (digital.library.unt.edu/ark:/67531/metadc899505/: accessed September 24, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.