Cryogenic system for SCC horizontal test

A cryogenic system for testing Superconducting RF cavity (SCC) in horizontal cryostat has been constructed. Thirty-two 5-cell SCC in 16 cryostat for TRISTAN electron positron collider have been tested at the test stand which consist of refrigerator/liquifier (BOC Turbo Cool 100: 300W/110litter/hr), 1000litter L.He dewar, and transfer lines. In the horizontal test we have comfirmed cryostat performance and cavity performance on low and high RF power. First horizontal test has been started in December 1987 and last one has been finished in July 1989. During this duration this system has achieved 23 times of horizontal test and has liquified He for vertical test. And finally all of SCC have successfully prepared for installation. Present equipment status and its operation experience of horizontal test will be reported. (author)