Determination of neutral beam direction from radiation emitted by photodetached H/sup [electronic resource].
- Upton, N.Y. : Brookhaven National Laboratory, 1986. and Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
- Physical Description:
- Pages: 10 : digital, PDF file
- Additional Creators:
- Brookhaven National Laboratory and United States. Department of Energy. Office of Scientific and Technical Information
- Restrictions on Access:
- Free-to-read Unrestricted online access
- Non-destructive diagnostic techniques to determine beam direction of 200 MeV H/sup 0/ atoms are analyzed. These methods are based on excited hydrogen atoms in n=2 and n=3 levels due to photodetachment of H/sup -/ ions. With some development of hot cathodes, an e-beam driven ArF laser can produce H*(2s) atoms for laser resonance fluorescence by photoneutralizing H/sup -/ ions in a quantity comparable to that of a gas cell. Observation of fluorescence from spontaneous decay of H*(2p) or induced decay of H*(2s) can be readily used to indicated beam orientation with a 40 ..mu..rad accuracy. Measurements of minute Doppler shifts of this Lyman Alpha radiation by a spectrograph could in principle resolve beam direction to within 2.8 ..mu..rad. For schemes requiring n=3 hydrogen atoms, a Xe laser can produce H*(3s) or H*(3p) atoms in quantities larger than previously published. 11 refs., 3 figs.
- Published through SciTech Connect., 01/01/1986., "bnl-39001", " conf-8610115-9", "DE87004174", 4. international symposium on the production and neutralization of negative ions and beams, Upton, NY, USA, 27 Oct 1986., and Hershcovitch, A.
- Funding Information:
View MARC record | catkey: 13826983