A New Scheme for Measuring the Length of Very Short Bunches at CEBAF

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The CEBAF injector is designed to bunch a 100 keV beam chopped to 60 degrees to a very short bunch of less than 1 degree at 5 MeV energy. Presented are a new scheme for measuring the phase distribution in the bunch that gives information about bunch length, and preliminary experimental results that show a resolution of better than 0.1 degree in phase at 1.5 GHz (or 0.2 ps in time). The advantages of the scheme compared with existing methods for bunch phase width measurement, such as using streak cameras, measuring the energy spread by bunch traversing a section of ... continued below

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page(s) 28-33

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Yao, Chong-guo October 1, 1990.

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Description

The CEBAF injector is designed to bunch a 100 keV beam chopped to 60 degrees to a very short bunch of less than 1 degree at 5 MeV energy. Presented are a new scheme for measuring the phase distribution in the bunch that gives information about bunch length, and preliminary experimental results that show a resolution of better than 0.1 degree in phase at 1.5 GHz (or 0.2 ps in time). The advantages of the scheme compared with existing methods for bunch phase width measurement, such as using streak cameras, measuring the energy spread by bunch traversing a section of accelerating structure at zero cross phase, or observing transition radiation, are: high resolution is obtained; it is suitable for any level of energy; and it is inexpensive. The scheme is not easy to apply to an intense beam where the space charge effect has an important impact on bunching.

Physical Description

page(s) 28-33

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  • Poster compiled for Workshop On Particle Beam Instrumentation, 1-4 Oct 1990, Batavia, Illinois

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  • Report No.: CEBAF-PR-90-19
  • Grant Number: AC05-84ER40150
  • Office of Scientific & Technical Information Report Number: 954160
  • Archival Resource Key: ark:/67531/metadc933814

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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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  • October 1, 1990

Added to The UNT Digital Library

  • Nov. 13, 2016, 7:26 p.m.

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  • Dec. 6, 2016, 2:03 p.m.

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Yao, Chong-guo. A New Scheme for Measuring the Length of Very Short Bunches at CEBAF, article, October 1, 1990; [Newport News, Virginia]. (digital.library.unt.edu/ark:/67531/metadc933814/: accessed October 19, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.