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AbstractAbstract
[en] HIMAC synchrotrons are now under construction, which require vacuum chambers of large aperture and high vacuum of about 10-9 torr. Wide thin wall vacuum chamber of 0.3 mm thickness reinforced with ribs has been developed as the chamber at dipole magnet. We have just now started to evacuate the lower ring. The obtained average value was about 5x10-8 torr with turbo-molecular and sputter ion pumps, and 1.1x10-9 torr after baking. (author)
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National Lab. for High Energy Physics, Tsukuba, Ibaraki (Japan); 509 p; 1994; p. 184-186; 9. symposium on accelerator science and technology; Tsukuba, Ibaraki (Japan); 25-27 Aug 1993
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