Mechanical Test of Stacked 4 ¡¿ 4 CICC for the KSTAR Central Solenoid

Abstract
The Central Solenoid (CS) of the KSTAR (Korea Superconducting Tokamak Advanced Research) consists of arrays of stacked CICC including the turn and ground insulation system. They should withstand the compressive preloads for subassembly and electromagnetic loads under various operating conditions. The large scale tests of the CS coil are necessary to assess the mechanical and electrical stability under both conditions. The stacked 4$imes$4 insulated conduit test modules were fabricated with the same materials and fabrication procedures as were used in the CS coil. Four strain gages were installed on both sides of the test modules to measure the module strain. Static tests were conducted under preloading conditions at room temperature and simulated operating conditions at 77 K, respectively. Fatigue tests were also carried out at 77 K. The electrical properties of the insulation system under high voltage were tested in order to confirm the integrity of each test module prior to the mechanical tests. Intermittent electrical tests were also performed at several stages under maximum load during the mechanical tests to ensure electrical performance. This paper describes the configuration of the stacked test module, fabrication procedures with the materials of components, and test procedures with apparatus.

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