Abstract
The occurrence of high voltage electrical breakdowns between the ion beam extraction grids of a high-power neutral beam injector is one of the major factors that determine the performance of an injector. The tedious procedure of `conditioning` the electrodes in up to several thousand shots and the stressing of electrical supplies by the fast transients are two examples illustrating the need for more understanding of the actual origins of the high-voltage breakdown and the desire to reduce their frequency, thereby shortening the down-times on an injector. This report is an attempt to systematically address these questions. It starts with a survey of the relevant literature relevant to gap breakdown in the extraction optics system. Considering the various possible reasons for breakdowns, different methods for conditioning are discussed as to their potential effectiveness and with respect to the necessary effort. The proposed experimental work to improve the conditioning time will then be described. Finally the results so far obtained will be reported. (orig.).
Morris, E C.A.
[1]
- Association Euratom-Max-Planck-Institut fuer Plasmaphysik, Garching (Germany)
Citation Formats
Morris, E C.A.
Understanding and improving the neutral beam injector conditioning problem.
Germany: N. p.,
1991.
Web.
Morris, E C.A.
Understanding and improving the neutral beam injector conditioning problem.
Germany.
Morris, E C.A.
1991.
"Understanding and improving the neutral beam injector conditioning problem."
Germany.
@misc{etde_10132523,
title = {Understanding and improving the neutral beam injector conditioning problem}
author = {Morris, E C.A.}
abstractNote = {The occurrence of high voltage electrical breakdowns between the ion beam extraction grids of a high-power neutral beam injector is one of the major factors that determine the performance of an injector. The tedious procedure of `conditioning` the electrodes in up to several thousand shots and the stressing of electrical supplies by the fast transients are two examples illustrating the need for more understanding of the actual origins of the high-voltage breakdown and the desire to reduce their frequency, thereby shortening the down-times on an injector. This report is an attempt to systematically address these questions. It starts with a survey of the relevant literature relevant to gap breakdown in the extraction optics system. Considering the various possible reasons for breakdowns, different methods for conditioning are discussed as to their potential effectiveness and with respect to the necessary effort. The proposed experimental work to improve the conditioning time will then be described. Finally the results so far obtained will be reported. (orig.).}
place = {Germany}
year = {1991}
month = {Sep}
}
title = {Understanding and improving the neutral beam injector conditioning problem}
author = {Morris, E C.A.}
abstractNote = {The occurrence of high voltage electrical breakdowns between the ion beam extraction grids of a high-power neutral beam injector is one of the major factors that determine the performance of an injector. The tedious procedure of `conditioning` the electrodes in up to several thousand shots and the stressing of electrical supplies by the fast transients are two examples illustrating the need for more understanding of the actual origins of the high-voltage breakdown and the desire to reduce their frequency, thereby shortening the down-times on an injector. This report is an attempt to systematically address these questions. It starts with a survey of the relevant literature relevant to gap breakdown in the extraction optics system. Considering the various possible reasons for breakdowns, different methods for conditioning are discussed as to their potential effectiveness and with respect to the necessary effort. The proposed experimental work to improve the conditioning time will then be described. Finally the results so far obtained will be reported. (orig.).}
place = {Germany}
year = {1991}
month = {Sep}
}