Time-resolved imaging for the APS linac beams.

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The particle-beam imaging diagnostics for the Advanced Photon Source (APS) injector lime have been enhanced by the installation of optical transition radiation (OTR) screens and the use of Ce-doped YAG crystals as beam profile monitors. Both converters have improved spatial resolution and time responses compared to the standard Chromox (Al{sub 2}O{sub 3}:Cr) screens used elsewhere in the linac. These enhancements allow us to address the smaller beam sizes (< 100 {micro}m) and the critical micropulse bunch length of higher brightness gun sources For the Linac macropulse of 30-ns duration composed of 86 micropulses at S-band frequency intervals, only the OTR ... continued below

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5 p.

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Lumpkin, A. H. September 29, 1998.

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Description

The particle-beam imaging diagnostics for the Advanced Photon Source (APS) injector lime have been enhanced by the installation of optical transition radiation (OTR) screens and the use of Ce-doped YAG crystals as beam profile monitors. Both converters have improved spatial resolution and time responses compared to the standard Chromox (Al{sub 2}O{sub 3}:Cr) screens used elsewhere in the linac. These enhancements allow us to address the smaller beam sizes (< 100 {micro}m) and the critical micropulse bunch length of higher brightness gun sources For the Linac macropulse of 30-ns duration composed of 86 micropulses at S-band frequency intervals, only the OTR mechanism is prompt enough to separate individual micropulses and to allow streak camera measurements of the micropulse averaged bunch length. Tests have been performed at 400 to 625 MeV using the gated DC thermionic gun source. Beam sizes less than {sigma}{sub x} = 30 {micro}m have been observed with a micropulse bunch length of {sigma} = 2-3 ps using OTR. First results on the lower-emittance rf thermionic gun are briefly discussed.

Physical Description

5 p.

Notes

INIS; OSTI as DE00010769

Medium: P; Size: 5 pages

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  • 19th International Linac Accelerator Conference (Linac '98), Chicago, IL (US), 08/23/1998--08/28/1998

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  • Report No.: ANL/ASD/CP-96385
  • Grant Number: W-31109-ENG-38
  • Office of Scientific & Technical Information Report Number: 10769
  • Archival Resource Key: ark:/67531/metadc625195

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  • September 29, 1998

Added to The UNT Digital Library

  • June 16, 2015, 7:43 a.m.

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  • April 11, 2017, 12:30 p.m.

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Lumpkin, A. H. Time-resolved imaging for the APS linac beams., article, September 29, 1998; Illinois. (digital.library.unt.edu/ark:/67531/metadc625195/: accessed October 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.