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The traditional way of relativistic electron beam (REB) injection in the experiments on REB- plasma interaction is the injection through an anode foil that separates vacuum diode from plasma chamber. The presence of separating foil leads to the following: (1) replacement of destroyed foil is required after each shot, and (2) the beam angular characteristics making worse. A beam with low angular spread can be obtained from foilless diode placed into strong guiding magnetic field; the problem is how to avoid the diode shortening in the presence of a dense plasma from the interaction chamber. In the experiments on studying of Langmuir turbulence, carrying out on GOL-M device it becomes possible to avoid a separating foil and to obtain a foilless injection of REB into a dense (16 cm-3) plasma, utilizing a special drift pipe as an anode of the foilless axially symmetric magnetized diode.
V. S. Burmasov,I. V. Kandaurov,E. P. Kruglyakov, andO. I. Meshkov
"Relativistic electron-beam generation in plasma-filled diode and foilless injection into dense plasma", Proc. SPIE 2259, XVI International Symposium on Discharges and Electrical Insulation in Vacuum, (1 May 1994); https://doi.org/10.1117/12.174542
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V. S. Burmasov, I. V. Kandaurov, E. P. Kruglyakov, O. I. Meshkov, "Relativistic electron-beam generation in plasma-filled diode and foil-less injection into dense plasma," Proc. SPIE 2259, XVI International Symposium on Discharges and Electrical Insulation in Vacuum, (1 May 1994); https://doi.org/10.1117/12.174542