Study of the influence of the injection section on the stability of a high-current relativistic electron beam propagating through the gaseous medium of a plasmochemical reactor |
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Authors: | N A Kondrat’ev V I Smetanin |
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Institution: | (1) Nuclear Physics Institute, Tomsk Polytechnical University, pr. Lenina 2a, Tomsk, 634050, Russia |
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Abstract: | Results are presented from experimental study of the influence of the injection section on the stability of a high-current
relativistic electron beam (REB) propagating through the gaseous medium of a plasmochemical reactor (PR). An REB with the
electron energy E
e
=1 MeV, beam current I
b
=10–22 kA, and pulse duration t=60 ns was generated by the Tonus accelerator and, then, injected into a 0.1-m-diameter PR filled with air. The PR consisted
of two sections with lengths L
1= 0.3–1.0 m and L
2=1.1–2.5 m; the total length of the system was no longer than 3.5 m. The first section was filled with air at a pressure of
P
1=0.8–1.5 torr, and the pressure in the second section was varied within the range P
2=0.1–760 torr. The current I
b
of an REB passed through both sections of the PR was measured with the help of a sectioned vacuum Faraday cup. The transportation
efficiency of the beam was determined as the ratio I
b
/I
inj, where I
inj is the beam current measured at the point of injection into the PR. It is shown that, for the optimal dimensions of the first
PR section, it has a stabilizing action on the REB with a current density of up to 3 kA/cm2, which makes it possible to increase the effective length of the second (working) PR section, which is filled with a gas
at various pressures, to L
2=(25–35)L
bet, where L
bet is the beam betatron length. |
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Keywords: | |
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