Design of the dummy coil for magnet power supply

•It is necessary to confirm safety of the MPS on a dummy coil before the operating it.•We selected and designed the water cooling type dummy coil to test on the MPS's rating (12.5kA) test.•For the design of the dummy coil, we considered requirements about electrical, structural and water coolin...

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Bibliographic Details
Published in:Fusion engineering and design 2013-11, Vol.88 (11), p.2796-2801
Main Authors: Kim, Chang-Hwan, Choi, Jae-Hoon, Jin, Jong-Kook, Lee, Dong-Keun, Kong, Jong-Dea, Joung, Nam-Young, Kim, Sang-Tae, Kim, Young-Jin, Kim, Yang-Soo, Kwon, Myeun
Format: Article
Language:English
Subjects:
Coil design
Coiling
Cross sections
Dummies
Dummy coil
Inductance
KSTAR
PF MPS
Power supplies
Superconductivity
Tokamak devices
Water cooling
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Summary:•It is necessary to confirm safety of the MPS on a dummy coil before the operating it.•We selected and designed the water cooling type dummy coil to test on the MPS's rating (12.5kA) test.•For the design of the dummy coil, we considered requirements about electrical, structural and water cooling.•We will test as the rating power after MPS upgrade and that test will do before every KSTAR campaign. It is necessary to test it on a dummy coil, before using a magnet power supply (MPS) to energize a Poloidal Field (PF) coil in the Korea Superconducting Tokamak Advanced Research (KSTAR) device. The dummy coil should accept the same large current from the MPS as the PF coil and be within the capability of the utilities located at the KSTAR site. Therefore a coil design based on the characteristics of the MPS and other restrictive conditions needed to be made. There are three requirements to be met in the design: an electrical requirement, a structural requirement, and a water cooling requirement. The electrical requirement was that the coil should have an inductance of 40mH. For the structural requirement, the material should be non magnetic. The coil support structure and water cooling manifold were made of SUS 304. The water cooling requirement was that there should be sufficient flow rate so that the temperature rise ΔT should not exceed 12°C for operation at 12.5kA for 5min. Square cross-section hollow conductor with dimensions of 38.1mm×38.1mm was used with a 25.4mm center hole for cooling water. However, as a result of tests, it was found that the electrical and structural requirements were satisfied but that the water cooling was over designed. It is imperative that the verification will be redone for a test with 12.5kA for 5min.
ISSN:0920-3796
1873-7196
DOI:10.1016/j.fusengdes.2013.04.027