Abstract
The heavy ion cooler synchrotron, TARN-II, has been operated for studies of accelerator technology and atomic physics since 1989 at the Institute for Nuclear Study, University of Tokyo. The ring has a circumference of 78 m and the vacuum pipe is made of SUS 316L stainless steel. The vacuum system consists of ion pumps, titanium sublimation pumps and turbo-molecular pumps. Beam experiments like acceleration, electron cooling, and extraction have been carried out at a mean pressure of the order of 10 −10 torr. In 1991, the upgrading of TARN-II vacuum system had been performed by adding ion pumps and titanium sublimation pumps in order to promote the experiments using heavy ion beams. Ion beams such as p, D, H 2 +, H 3 +, 3He +, 4He 2+, HD 2 +, 4HeH +, 14N 5+ and 14N 7+ have been injected and circulated in the ring so far.
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