Current leads for the SuperKEKB final focus SC magnets

宗占国, 大内徳人, 土屋清澄, 東憲男, 山岡広, 有本靖, 近藤良也, 川井正徳（KEK）

Abstract:The service cryostats of the final focus superconducting (SC) magnets at the SuperKEKB interaction region (IR) will be equipped with 110 current leads in total. The 22 leads of the SC quadrupole magnets and solenoids, rated at 450 A, 1.0 kA, 1.35 kA, 1.8 kA and 2 kA, are conventional leads and commercially supplied. The other leads for the SC correctors, with the design currents of about 70 A, are incorporated with a HTS section and have been developed at KEK. Considering the large number of 70 A leads and the strong space constraints imposed by the configurations of the cryostats, every 8 leads are assembled into a same cooling channel. The cryogenic tests of all the lead types are being carried out at KEK prior to integration into the service cryostats. This paper describes the thermal and electrical specification of the leads and presents the cryogenic test results.