Optical techniques for electron-beam characterizations on the APS SASE FEL project

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Description

At the Advanced Photon Source (APS) the injector linac`s DC thermionic gun is being supplemented by a low-emittance rf thermionic gun that will support the SASE FEL project. To address the anticipated smaller beam sizes, the standard Chromox beam-profiling screens are being complemented by optical transition radiation (OTR) and Ce-doped YAG single-crystal converters. Direct comparisons of the effective conversion efficiency, spatial resolution, and time response of the three converter screen types have been performed using the DC thermionic gun`s beam accelerated to 400 to 650 MeV. An apparent blurring of observed beam size with increasing incident charge areal density in ... continued below

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15 p.

Creation Information

Lumpkin, A.H.; Yang, B.X.; Berg, W.J.; White, M.; Lewellen, J.W. & Milton, S.V. September 1, 1998.

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Description

At the Advanced Photon Source (APS) the injector linac`s DC thermionic gun is being supplemented by a low-emittance rf thermionic gun that will support the SASE FEL project. To address the anticipated smaller beam sizes, the standard Chromox beam-profiling screens are being complemented by optical transition radiation (OTR) and Ce-doped YAG single-crystal converters. Direct comparisons of the effective conversion efficiency, spatial resolution, and time response of the three converter screen types have been performed using the DC thermionic gun`s beam accelerated to 400 to 650 MeV. An apparent blurring of observed beam size with increasing incident charge areal density in the YAG crystal was observed for the first time. Only the OTR was prompt enough for the few-ps domain micropulse bunch length measurements performed with a stream camera. Initial beam images of the rf-thermionic gun beam have also been obtained.

Physical Description

15 p.

Notes

INIS; OSTI as DE98058861

Source

  • FEL `98: 20. international conference, Williamsburg, VA (United States), 16-21 Aug 1998

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  • Other: DE98058861
  • Report No.: ANL/ASD/CP--96526
  • Report No.: CONF-980842--
  • Grant Number: W-31109-ENG-38
  • Office of Scientific & Technical Information Report Number: 291047
  • Archival Resource Key: ark:/67531/metadc680018

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  • September 1, 1998

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  • July 25, 2015, 2:20 a.m.

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  • Nov. 5, 2015, 1:52 p.m.

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Lumpkin, A.H.; Yang, B.X.; Berg, W.J.; White, M.; Lewellen, J.W. & Milton, S.V. Optical techniques for electron-beam characterizations on the APS SASE FEL project, article, September 1, 1998; United States. (digital.library.unt.edu/ark:/67531/metadc680018/: accessed September 25, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.