Speaker
Description
Magnet Cold Test Bench (MCTB) is a test facility under development to test the superconducting Toroidal Field (TF) and Poloidal Field (PF-1) magnets at ITER. The testing of the magnets will be performed at 4K cryogenic temperature. The cryostat is required for housing the TF and PF-1 magnets in the vacuum environment for test at cryogenic temperature.
The material of construction for the cryostat is stainless steel type 304L/ 304. The cryostat shall be designed for operating conditions with vacuum level 10-4 mbar or better. The design of cryostat has to be performed in consideration of the major constraints like maximum dimensions and weight for road transport from Marseille port to ITER site, crane lifting capacity and lifting height in the ITER site building 55 where the test will be performed. This restricts the overall weight of cryostat to be under 330 tonnes with weight of top cover to be limited to maximum 90 tonnes. The maximum width of the cryostat is constrained to be under 10.5 m. The challenging schedule of the overall test program puts restriction on cryostat to be fully manufactured in factory and avoid any welding and construction activity on ITER site.
This paper will focus on the final design of the cryostat shell and associated components like the 4 K active cooled magnet supports, pressure release device, multi layer insulation. The cryostat structural analysis will be performed for the load cases like Electromagnetic (EM) loads, vacuum, magnet fast discharge, seismic. The challenges encountered during the design process will be presented in this paper. The paper also presents the update on the manufacturing process of the cryostat.
