Determination of neutral beam direction from radiation emitted by photodetached H/sup -/
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.
- Research Organization:
- Brookhaven National Lab., Upton, NY (USA)
- DOE Contract Number:
- AC02-76CH00016
- OSTI ID:
- 6845725
- Report Number(s):
- BNL-39001; CONF-8610115-9; ON: DE87004174
- Resource Relation:
- Conference: 4. international symposium on the production and neutralization of negative ions and beams, Upton, NY, USA, 27 Oct 1986
- Country of Publication:
- United States
- Language:
- English
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GENERAL PHYSICS
HYDROGEN
ATOMIC BEAMS
BEAM MONITORING
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LASER SPECTROSCOPY
MEV RANGE 100-1000
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ENERGY RANGE
LUMINESCENCE
MEV RANGE
MONITORING
NONMETALS
SPECTROSCOPY
640301* - Atomic
Molecular & Chemical Physics- Beams & their Reactions