Plasma density from Cerenkov radiation, betatron oscillations, and beam steering in a plasma wakefield experiment at 30 GeV
A method for using Cerenkov radiation near atomic spectral lines to measure plasma source properties for plasma wakefield applications has been discussed and experimentally verified. Because the radiation co-propagates with the electron beam, the radiation samples the source properties exactly along the path of interest with perfect temporal synchronization. Observation wavelengths were chosen with respect to the atomic resonances of the plasma source, where the relative change in the index of refraction strongly affects the Cerenkov cone angle, and permits flexible diagnostic design. The Cerenkov spatial profiles were systematically studied for a Lithium heat pipe oven as a function of oven temperature and observation wavelength. Neutral densities and plasma densities were extracted from the measurements.
- Research Organization:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE Director, Office of Science. Office of High Energy and Nuclear Physics. Division of High Energy Physics (US)
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 787115
- Report Number(s):
- LBNL-47632; CBP Note-375, LOL Note-077; R&D Project: 455401; TRN: US0110429
- Resource Relation:
- Other Information: PBD: 1 Jan 2001
- Country of Publication:
- United States
- Language:
- English
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Measurements of radiation near an atomic spectral line from the interaction of a 30 GeV electron beam and a long plasma
Measurements of radiation near an atomic spectral line from the interaction of a 30 GeV electron beam and a long plasma