Rapid current transition in a crossed-field diode
- Electronics Research Laboratory, University of California, Berkeley, California 94720 (United States)
The transmitted current in a crossed-field gap has been characterized analytically by a number of authors. Using a one dimensional PIC simulation, we explore the behavior of the crossed-field diode at {ital B}={ital B}{sub {ital Hull}}. For mono-energetic (cold) emission, a rapid reduction of transmitted current is observed when the injected current exceeds the critical current by just 1{percent}. The addition of a small electron temperature normal to the cathode eliminates the transition, even for {ital kT}/{ital V}{approximately}10{sup {minus}5} ({ital V}=10 kV, gap = 1 cm, {ital B}=337 G, {ital J}=1.69 A/cm{sup 2}), while an isotropic velocity distribution accelerates the transition. {copyright} {ital 1996 American Institute of Physics.}
- OSTI ID:
- 278971
- Journal Information:
- Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 3 Vol. 3; ISSN 1070-664X; ISSN PHPAEN
- Country of Publication:
- United States
- Language:
- English
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