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Plasma-Parameter Measurements Using Neutral-Particle-Beam Attenuation
Intense and energetic neutral-particle-beam injection used for fueling or heating magnetically confined, controlled-fusion experimental plasmas can also provide diagnostic measurements of the plasmas. The attenuation of an atomic beam (mainly from charge-exchange and ionization interactions) when passing through a plasma gives the plasma line density. Orthogonal arrays of highly collimated detectors of the secondary-electron-emission type have been used in magnetic-mirror experiments to measure neutral-beam attenuation along chords through the plasma volume at different radial and axial positions. The radial array is used to infer the radial plasma-density profile; the axial array, to infer the axial plasma-density profile and the ion angular distribution at the plasma midplane.
Date:
July 7, 1982
Creator:
Foote, J. H.; Molvik, A. W. & Turner, W. C.
System:
The UNT Digital Library
The NIH Recombinant DNA Guidelines: Brief History and Current Status
This Congressional Research Service Report for Congress provides information on the history and timeline of recombinant DNA and its uses.
Date:
July 7, 1982
Creator:
Johnson, Judith A.
System:
The UNT Digital Library