Effect of thermionic cathode heating current self-magnetic field on gaseous plasma generator characteristics; Review of Scientific Instruments; Vol. 86,iss. 10

Effect of thermionic cathode heating current self-magnetic field on gaseous plasma generator characteristics; Review of Scientific Instruments; Vol. 86,iss. 10

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Parent link:Review of Scientific Instruments
Vol. 86,iss. 10.— 2015.— [103301 p.]
Hlavní autor: Lopatin I. V.
Korporativní autor: Национальный исследовательский Томский политехнический университет (ТПУ)
Další autoři: Akhmadeev Y. H., Koval N. N. Nikolay Nikolaevich
Shrnutí:Title screen
The performance capabilities of the PINK, a plasma generator with a thermionic cathode mounted in the cavity of a hollow cathode, depending for its operation on a non-self-sustained low-pressure gas discharge have been investigated. It has been shown that when a single-filament tungsten cathode 2 mm in diameter is used and the peak filament current is equal to or higher than 100 A, the self-magnetic field of the filament current significantly affects the discharge current and voltage waveforms. This effect is due to changes in the time and space distributions of the emission current density from the hot cathode. When the electron mean free path is close to the characteristic dimensions of the thermionic cathode, the synthesized plasma density distribution is nonuniform and the cathode is etched nonuniformly. The cathode lifetime in this case is 8–12 h. Using a cathode consisting of several parallel-connected tungsten filaments ?0.8 mm in diameter moderates the effect of the self-magnetic field of the filament current and nearly doubles the cathode lifetime. The use of this type of cathode together with a discharge igniting electrode reduces the minimum operating pressure in the plasma generator to about one third of that required for the generator operation with a single-filament cathode (to 0.04 Pa).
Режим доступа: по договору с организацией-держателем ресурса
Jazyk:ruština
Vydáno: 2015
Témata:
электронный ресурс
труды учёных ТПУ
On-line přístup:http://dx.doi.org/10.1063/1.4932543
Médium: Elektronický zdroj Kapitola
KOHA link:https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=647457

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