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Registration Number

0215U004555, 0114U004331 , R & D reports

Title

Development and investigation of optimal regimes of RF-cleaning of torsatron U-2M vacuum chamber walls via the use of optical and contact probes.

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Head

Voitsenya Vladimir Sergeevich, Доктор фізико-математичних наук

Registration Date

04-06-2015

Organization

National Science Center "Kharkiv Institute of Physics and Technology

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During the current year the work was continued directing to optimize the regime of wall conditioning procedure for Uragan-2M device. Aiming this, different RF generators, different combinations of background gases with different magnetic strength were used. The gases were: hydrogen, helium, or mixtures of hydrogen plus nitrogen, hydrogen plus oxygen, helium plus nitrogen, and helium plus oxygen. As the base, stationary discharge maintaining by generator operating at ultrahigh frequency (135 MHz) was served. For the first time a liquid nitrogen trap was used regularly, which was cooled for some (measured) time interval during conditioning procedure and then warmed up having been isolated both from vacuum chamber and from pumping system. The experiments demonstrate that most effective are discharges in mixtures: helium plus oxygen and hydrogen plus nitrogen. Taking these results into account, further work on cleaning of the Uragan-2M chamber walls from light impurities (oxygen, carbon) is being provided using the mixture 95% hydrogen + 5% nitrogen.

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Барон Дем'ян Ілліч
Грігорьева Людмила Іванівна
Евсюков Олександр Вікторович
Коровін Валерій Борісович
Красюк Олександр Юрійович
Мазніченко Сергій Михайлович
Моісеенко Володимир Евгенович
Пашнев Валерій Костянтинович
Чернишенко Віктор Яккович
Шаповал Анатолій Миколайович

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2020-04-02