Speaker
Mr
Alexey Sorokin
(Budker Institute of Nuclear Physics)
Description
The 15 kV, 2 MW neutral beam injector (NBI) was developed for C-2U magnetic trap experiments. Important part of the NBI is efficient pumping system which provided a good vacuum condition during beam pulse. The pressure rise during the NBI operation and accompanying gas flow to the fusion device is a negative factor both for the beam transportation and for fusion experiment. The high-speed pumping system based on four Ti-bar arc-discharge evaporators placed inside LN2-cooled volume was developed and succesfully used in vacuum chamber of the 2 MW NBI. The results of calculations and tests are presented both at the room and at the LN2 temperatures of the gettered surface. Achieved pumping speeds are about $10^5$ and $4\cdot10^5$ l/s correspondingly. Also gas capacitance of the gettered surface and conditions of uniform gettering were established.
Primary author
Mr
Alexey Sorokin
(Budker Institute of Nuclear Physics)
Co-authors
Mr
Alan Van Drie
(TAE)
Mr
Aleksandr Dranichnikov
(Budker Institute of Nuclear Physics)
Dr
Alexander Ivanov
(Budker Institute of Nuclear Physics)
Dr
Petr Deichuli
(Budker Institute of Nuclear Physics)
Dr
Sergey Korepanov
(TAE)
