Accession Number:

ADA101952

Title:

Time-Dependent Plasma Behavior Triggered by a Pulsed Electron Gun under Conditions of Beam-Plasma-Discharge.

Descriptive Note:

Interim rept.,

Corporate Author:

NAVAL RESEARCH LAB WASHINGTON DC

Personal Author(s):

Report Date:

1981-07-13

Pagination or Media Count:

21.0

Abstract:

We have conducted a number of experiments intended to simulate spaceborne applications of energetic electron guns while exploring the in situ diagnostics of time-dependent beam-plasma behavior under pulsed electron gun conditions. The conditions include the beam-plasma-discharge BPD and the BPD afterglow that exists after gun-pulse termination. With electron gun characteristics set at Ig, Vg, TonToff 34 ma, 1.9 keV, 80 ms270 ms and a superimposed magnetic field at 1.5 gauss, the results show that 1 There is a three order-of-magnitude increase in plasma density within 5 ms of gun turn-on 2 During the pulse-ON time a quasi-steady-state BPD is maintained with characteristics identical to dc-BPD conditions 3 Plasma losses appear to be dominated by Bohm-like diffusion processes and finally 4 The afterglow can be characterized by an isodensity radial profile that decays with a 36 msec time constant and cools at a 3800 Ksec rate. Author

Subject Categories:

  • Particle Accelerators

Distribution Statement:

APPROVED FOR PUBLIC RELEASE