Study of intense relativistic electron beam self-focusing dynamics
Yu M Gorbulin; E M Gordeev; D M Zlotnikov; Yu G Kalinin; P V Kuksov; V A Skoryupin; E A Smirnova; S D Fanchenko; A Yu Shashkov; Yu M Gorbulin; I.V. Kurchatov Inst. of Atomic Energy, Moscow, USSR; E M Gordeev; I.V. Kurchatov Inst. of Atomic Energy, Moscow, USSR; D M Zlotnikov; I.V. Kurchatov Inst. of Atomic Energy, Moscow, USSR; Yu G Kalinin; I.V. Kurchatov Inst. of Atomic Energy, Moscow, USSR; P V Kuksov; I.V. Kurchatov Inst. of Atomic Energy, Moscow, USSR; V A Skoryupin; I.V. Kurchatov Inst. of Atomic Energy, Moscow, USSR; E A Smirnova; I.V. Kurchatov Inst. of Atomic Energy, Moscow, USSR; S D Fanchenko; I.V. Kurchatov Inst. of Atomic Energy, Moscow, USSR; A Yu Shashkov; I.V. Kurchatov Inst. of Atomic Energy, Moscow, USSR
Журнал:
Plasma Physics and Controlled Fusion
Дата:
1985-01-01
Аннотация:
Time-resolved data on intense REB self-focusing in 'MIRAGE' (V=0.8 MV, I=200 kA) and 'KALMAR' (V=0.4 MV, I=150 kA) devices are presented. The 5 ns frame-exposure X-ray photography data corroborate very well with the sharp e-beam focusing reported previously in 'MIRAGE'. The instantaneous current density and power flux in 'MIRAGE' were up to 80 MA cm<sup>-2</sup> and up to 6*10<sup>13</sup> W cm<sup>-2</sup>, respectively, exceeding the corresponding time-integrated values by an order of magnitude. The REB sharp focus was seen to wander all over the time-integrated focusing area. The REB behaviour in the 'KALMAR' diode up and downstream from the anode was studied using X-ray pinholes. The FWHM REB focal spot diameter seen in direct time-integrated recording, in 30 ns and 5 ns exposure frames was 2.5-3.5 mm, 1.5-2 mm and 1-1.5 mm, respectively. Data on focal spot-size time dependence were obtained.
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