Abstract
A large-scale cryopumping system using low temperature (3.5 K) liquid helium (LHe) was installed in the axisymmetrized tandem mirror GAMMA 10 in order to obtain a clean vacuum condition with a larger pumping speed. Four cryopumps were installed in the end-mirror tanks and in the NBI tanks of the anchor regions on both sides. Performance tests have confirmed that the measured pumping speed agrees well with the designed value. By using this pumping system, the base pressure in the end-mirror region has reached below 1 × 10 −8 torr and improved thermal-barrier experiments were successfully carried out under the upgraded vacuum condition.
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