Preliminary tests of the optical diagnostics for the APS low-energy undulator test line particle beam
An alternate configuration of the injector linacs (low-energy undulator test line) at the Advanced Photon Source (APS) combined with a thermionic rf gun is projected to provide low, normalized emittance electron beams ({var_epsilon}{sub n} {approximately} 5% mm mrad). By using the electron linac and the inline, rephased positron linac, beam energies from 250 to 650 MeV with bunch lengths sigma {sigma}{sub t} {approximately} 1 ps are possible. In order to characterize such beams, the present intercepting Chromox screens with limited spatial resolution and temporal response are being complemented by optical transition radiation (OTR) screens at selected positions in the beamline to provide sub-100 {micro}m spatial resolution and sub-ps response times. Initial OTR images have been obtained from a beam at 650 MeV using the conventional thermionic gun to generate a 30-ns-long macropulse. Micropulse bunch lengths as short as 3 to 4 ps ({sigma}) were also measured using a C5680 streak camera. Additionally, coherent transition radiation (CTR) and diffraction radiation (DR) based techniques will be evaluated. These beam characterizations will support self-amplified spontaneous emission (SASE) scaling experiments.
- Research Organization:
- Argonne National Lab., Advanced Photon Source, IL (United States)
- Sponsoring Organization:
- USDOE Office of Energy Research, Washington, DC (United States)
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 634092
- Report Number(s):
- ANL/ASD/CP-93265; CONF-970885-; ON: DE97054213; TRN: 98:009825
- Resource Relation:
- Conference: FEL `97: international free electron laser conference and 4. free electron laser users` workshop, Beijing (China), 18-22 Aug 1997; Other Information: PBD: Aug 1997
- Country of Publication:
- United States
- Language:
- English
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