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Observations of two-stream collisional instability due to interaction of monoenergetic relativistic electron beams with gas

Published online by Cambridge University Press:  09 March 2009

V.M. Batenin ,
A.V. Danilov ,
A.O. Ikonnikov ,
S.A. Ilchenko ,
A.T. Kunavin ,
A.V. Markov ,
D.V. Sapozhnikov ,
P.M. Tokar ,
I.V. Vovk  and
V.Y. Yakovlev
...Show all authors
V.M. Batenin
Affiliation:
Institute for High Temperatures, USSR Academy of Sciences, Izhorskaya str., 13/19, 127412 Moscow, Russia
A.V. Danilov
Affiliation:
Institute for High Temperatures, USSR Academy of Sciences, Izhorskaya str., 13/19, 127412 Moscow, Russia
A.O. Ikonnikov
Affiliation:
Institute for High Temperatures, USSR Academy of Sciences, Izhorskaya str., 13/19, 127412 Moscow, Russia
S.A. Ilchenko
Affiliation:
Institute for High Temperatures, USSR Academy of Sciences, Izhorskaya str., 13/19, 127412 Moscow, Russia
A.T. Kunavin
Affiliation:
Institute for High Temperatures, USSR Academy of Sciences, Izhorskaya str., 13/19, 127412 Moscow, Russia
A.V. Markov
Affiliation:
Institute for High Temperatures, USSR Academy of Sciences, Izhorskaya str., 13/19, 127412 Moscow, Russia
D.V. Sapozhnikov
Affiliation:
Institute for High Temperatures, USSR Academy of Sciences, Izhorskaya str., 13/19, 127412 Moscow, Russia
P.M. Tokar
Affiliation:
Institute for High Temperatures, USSR Academy of Sciences, Izhorskaya str., 13/19, 127412 Moscow, Russia
I.V. Vovk
Affiliation:
Institute for High Temperatures, USSR Academy of Sciences, Izhorskaya str., 13/19, 127412 Moscow, Russia
V.Y. Yakovlev
Affiliation:
Institute for High Temperatures, USSR Academy of Sciences, Izhorskaya str., 13/19, 127412 Moscow, Russia
V.S. Zhivopistsev
Affiliation:
Institute for High Temperatures, USSR Academy of Sciences, Izhorskaya str., 13/19, 127412 Moscow, Russia
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Abstract

We have studied experimentally the beam-plasma two-stream dissipative collisional instability of relativistic electron beams (REB) injected into plasma produced by interaction of REB with neutral nitrogen. The gas pressure ranged from 0.02 to 8 Torr. REB (T = 100 μs, E = 300 keV, 7 = 3–15 A) were injected into gas through a pulsed foilless valve. An external magnetic field was not used. A description of the experimental setup and that of applied diagnostics are presented. In some of the experiments the inner walls of a metallic interaction chamber were covered with microwave-absorbent material. We present the experimental dependence of the critical current of two-stream instability on gas pressure and beam penetration length. We have also measured the distribution of microwave emission along the beam axis. The influence of plasma self-radiation on the instability was observed and is attributed to a feedback. A possible mechanism of the feedback is discussed.

Type
Research Article
Information
Laser and Particle Beams , Volume 11 , Issue 3 , September 1993 , pp. 595 - 609
Copyright
Copyright © Cambridge University Press 1993

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