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2024 ANS Annual Conference
June 16–19, 2024
Las Vegas, NV|Mandalay Bay Resort and Casino
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Fusion Science and Technology
Latest News
College students help develop waste-measuring device at Hanford
A partnership between Washington River Protection Solutions (WRPS) and Washington State University has resulted in the development of a device to measure radioactive and chemical tank waste at the Hanford Site. WRPS is the contractor at Hanford for the Department of Energy’s Office of Environmental Management.
S. Hamaguchi, T. Okamura, S. Imagawa, T. Obana, N. Yanagi, T. Mito
Fusion Science and Technology | Volume 58 | Number 1 | July-August 2010 | Pages 581-585
Chapter 12. Superconducting Magnet System | Special Issue on Large Helical Device (LHD) | doi.org/10.13182/FST10-A10845
Articles are hosted by Taylor and Francis Online.
The helical coils in the Large Helical Device (LHD) are large-scale superconducting magnets for heliotron plasma experiments. The cooling system of the coils was upgraded in 2006 to improve the cryogenic stability of the coils using subcooled helium as the coolant. In the present study, characteristics of the upgraded cooling system have been investigated and the steady-state operating method in which the subcooled helium of 50 g/s at 3.2 K is supplied stably to the coils has been developed. The supplied helium is subcooled via a heat exchanger in a saturated helium bath. The bath pressure and the temperature are reduced by a series of two centrifugal cold compressors. Based on the measured characteristics of the subcooling system, the optimization of the operating method has been performed using an automatic control of the mass flow rate through the cold compressors by the heater. Consequently, the designed mass flow rate and temperature were obtained and stable long-term operations have been achieved. The improvement of the cryogenic stability was also confirmed and the maximum average current of three blocks of the coils has reached up to 11.833 kA.