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Analysis of a new electron-runaway mechanism and of record-high runaway-electron currents achieved in dense-gas discharges

It is shown that the ’new’ runaway criterion for electrons in dense gases suggested by Tarasenko and Yakovlenko (Usp. Fiz. Nauk 174 953 (2004) [Phys. Usp. 47 887 (2004)]) is actually not a criterion, and the ’upper’ curve of the U(Pd) dependence does not exist. Only the Z-shaped segment of U(Pd) in the region of small Pd, known for helium since the early 1930s, agrees with the reality. The decrease in the ionization coefficient with E/P increasing and the existence of Pdmin for helium have been known since the same time. Doubt is cast upon the ’record’ runaway-electron currents at P = 1 atm. The acceleration mechanism suggested in the above article has been known for a long time, and the interpretation of the ’record’ runaway-electron currents on this basis is the result of fitting the data to the formula that implies the lack of electron multiplication but is ’understood’ by Tarasenko and Yakovlenko as a runaway criterion. Nothing new has been added to the mechanism of volumetric discharge formation, but mistakes have been made.

Text can be downloaded in Russian. English translation is available on IOP Science.
PACS: 41.75.Fr, 51.50.+v, 52.80.Dy (all)
DOI: 10.1070/PU2005v048n10ABEH002805
URL: https://ufn.ru/en/articles/2005/10/c/
Citation: Babich L P "Analysis of a new electron-runaway mechanism and of record-high runaway-electron currents achieved in dense-gas discharges" Phys. Usp. 48 1015–1037 (2005)
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Оригинал: Бабич Л П «Анализ нового механизма убегания электронов и рекордных токов убегающих электронов, достигнутых в разрядах в плотных газах» УФН 175 1069–1091 (2005); DOI: 10.3367/UFNr.0175.200510g.1069

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