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Title: Determination of neutral beam direction from radiation emitted by photodetached H/sup -/

Abstract

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.

Authors:
Publication Date:
Research Org.:
Brookhaven National Lab., Upton, NY (USA)
OSTI Identifier:
6845725
Report Number(s):
BNL-39001; CONF-8610115-9
ON: DE87004174
DOE Contract Number:  
AC02-76CH00016
Resource Type:
Conference
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
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; HYDROGEN; ATOMIC BEAMS; BEAM MONITORING; FLUORESCENCE; LASER SPECTROSCOPY; MEV RANGE 100-1000; BEAMS; ELEMENTS; ENERGY RANGE; LUMINESCENCE; MEV RANGE; MONITORING; NONMETALS; SPECTROSCOPY; 640301* - Atomic, Molecular & Chemical Physics- Beams & their Reactions

Citation Formats

Hershcovitch, A. Determination of neutral beam direction from radiation emitted by photodetached H/sup -/. United States: N. p., 1986. Web.
Hershcovitch, A. Determination of neutral beam direction from radiation emitted by photodetached H/sup -/. United States.
Hershcovitch, A. Wed . "Determination of neutral beam direction from radiation emitted by photodetached H/sup -/". United States. https://www.osti.gov/servlets/purl/6845725.
@article{osti_6845725,
title = {Determination of neutral beam direction from radiation emitted by photodetached H/sup -/},
author = {Hershcovitch, A},
abstractNote = {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.},
doi = {},
url = {https://www.osti.gov/biblio/6845725}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1986},
month = {1}
}

Conference:
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