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Optical measurements of a large-scale laboratory Beam Plasma Discharge (BPD)Optical emission measurements provided information on the spatial distribution of energetic (primary and suprathermal) electrons producing the emissions; power dissipation during beam transit of the system; and modifications of the primary beam velocity distribution. The measurements were carried out for BPD's produced in a very large vacuum chamber using a 391.4 nm scanning photometer and total light (red sensitive) TV systems. Results for conditions Eb 500 to 2000 V, injection pitch angle 0 to 75 deg, and neutral density are presented. The typical power loss in ionization in transit of the 20 m pathlength during BPD is from 3 to 10% of the input power, an order of magnitude greater than attributable to collisional ionization alone. Differences between rocket observations and the laboratory results are noted.
Document ID
19840006128
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Bernstein, W.
(Rice Univ. Houston, TX, United States)
Mantjoukis, G.
(Rice Univ. Houston, TX, United States)
Leinbach, F. H.
(NOAA Boulder, Colo., United States)
Hallinan, T.
(Alaska Univ. Fairbanks, United States)
Date Acquired
August 12, 2013
Publication Date
July 1, 1983
Publication Information
Publication: ESA Active Expts. in Space
Subject Category
Optics
Accession Number
84N14196
Funding Number(s)
CONTRACT_GRANT: NAGW-69
CONTRACT_GRANT: NSF ATM-80-22550
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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