Optical techniques for electron-beam characterizations on the APS SASE FEL project
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.
- Research Organization:
- Argonne National Lab., Advanced Photon Source Div., IL (United States)
- Sponsoring Organization:
- USDOE Office of Energy Research, Washington, DC (United States)
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 291047
- Report Number(s):
- ANL/ASD/CP-96526; CONF-980842-; ON: DE98058861; TRN: 99:002191
- Resource Relation:
- Conference: FEL `98: 20. international conference, Williamsburg, VA (United States), 16-21 Aug 1998; Other Information: PBD: [1998]
- Country of Publication:
- United States
- Language:
- English
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