Bunch-Length Measurements in PEP-II

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We measured the lengths of colliding e{sup +}e{sup -} bunches in the PEP-II B Factory at SLAC using various techniques. First, at several RF voltages and with both single-bunch and multibunch beams, a synchroscan streak camera measured synchrotron emission through a narrow blue filter. With 3.8 MV of RF, the length of a single positron bunch was 12 mm at low current, rising to 13 mm at 1.5 mA and 14.8 mm at 3 mA. The electrons measured 12.2 mm at 16 MV with little current dependence. Both are longer than the expected low-current value of 10 mm (e{sup +}) ... continued below

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4 pages

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Fisher, Alan S.; Novokhatski, A.; Turner, J.L.; Wienands, U.; Yocky, G.; /SLAC et al. June 10, 2005.

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We measured the lengths of colliding e{sup +}e{sup -} bunches in the PEP-II B Factory at SLAC using various techniques. First, at several RF voltages and with both single-bunch and multibunch beams, a synchroscan streak camera measured synchrotron emission through a narrow blue filter. With 3.8 MV of RF, the length of a single positron bunch was 12 mm at low current, rising to 13 mm at 1.5 mA and 14.8 mm at 3 mA. The electrons measured 12.2 mm at 16 MV with little current dependence. Both are longer than the expected low-current value of 10 mm (e{sup +}) and 10.5 mm (e{sup -}), derived from the energy spread and the measured synchrotron tune. We also determined the length for multibunch fills from measurements between 2 and 13 GHz of the bunch spectrum on a BPM button. After correcting for the frequency dependence of cable attenuation, we fitted the measured spectrum to that of a Gaussian bunch. At 3.8 MV, the positron measurement gave 13.2 mm at 1.5 mA/bunch in a full ring, shorter than the 15.6 mm found with the streak camera under these conditions, but we found 11.4 mm for the electrons at 16.7 MV and 1 mA/bunch, in good agreement with the 11 mm from multibunch streak measurements.

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4 pages

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  • Presented atParticle Accelerator Conference (PAC 05), , 5/16/2005-5/20/2005

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  • Report No.: SLAC-PUB-11230
  • Grant Number: AC02-76SF00515
  • Office of Scientific & Technical Information Report Number: 890447
  • Archival Resource Key: ark:/67531/metadc881914

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  • June 10, 2005

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  • Sept. 21, 2016, 2:29 a.m.

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  • Dec. 2, 2016, 8:45 p.m.

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Fisher, Alan S.; Novokhatski, A.; Turner, J.L.; Wienands, U.; Yocky, G.; /SLAC et al. Bunch-Length Measurements in PEP-II, article, June 10, 2005; [Menlo Park, California]. (digital.library.unt.edu/ark:/67531/metadc881914/: accessed August 16, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.