Results of the Excitation Test of the LHD Helical Coils Cooled by Subcooled Helium

Imagawa, S.; Obana, T.; Hamaguchi, S.; Yanagi, N.; Mito, T.; Moriuchi, S.; Sekiguchi, Hiroyuki; Ooba, K.; Okamura, Tomonori; Komori, A.; Motojima, O.

doi:10.1109/tasc.2008.921977

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Calculation Of Balance Voltage1

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Cited by 9 publications

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References 6 publications

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“…In actual fact, t r should depend on the position. Considering the deterioration of cooling condition by accumulation of bubbles at the bottom [15], the following equation is assumed:…”

Section: Calculation Of Balance Voltagementioning

confidence: 99%

Reconsideration of Evaluation of Balance Voltages During a Normal Zone Propagation in the LHD Helical Coils

Imagawa

Yanagi

Mito

2013

IEEE Trans. Appl. Supercond.

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“…In actual fact, t r should depend on the position. Considering the deterioration of cooling condition by accumulation of bubbles at the bottom [15], the following equation is assumed:…”

Section: Calculation Of Balance Voltagementioning

confidence: 99%

Reconsideration of Evaluation of Balance Voltages During a Normal Zone Propagation in the LHD Helical Coils

Imagawa

Yanagi

Mito

2013

IEEE Trans. Appl. Supercond.

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“…The bath pressure and temperature are reduced by a series of two centrifugal cold compressors with gas foil bearing [7]. After the installation, the maximum operating current of 11.833 kA was achieved due to improvement of the cryogenic stability [8,9]. Also, the system has been operated stably, while the running time of the cold compressors exceeds 30,000 hours and the total time of subcooling operations exceeds 20,000 hours.…”

Section: Introductionmentioning

confidence: 99%

Operations of the Helium Subcooling System for the LHD Helical Coils during Ten Plasma Experimental Campaigns

Hamaguchi

Imagawa

Obana

et al. 2018

Plasma and Fusion Research

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The Large Helical Device has a helium subcooling system with two cold compressors for helical coils to enhance the magnetic fields and improve the cryogenic stability of the coils by lowering the coil temperature. The system was installed in 2006 and then it has stably supplied 3.2 K subcooled helium at the nominal mass flow rate of 50 g/s to the coils during ten plasma experimental campaigns. The running time of the cold compressors exceeds 30,000 hours and the total time of subcooling operations exceeds 20,000 hours. In the system, the supplied helium is subcooled in a heat exchanger of a saturated helium bath. The bath pressure and temperature are reduced by a series of two centrifugal cold compressors with gas foil bearing. In the steady state subcooling operation, the bath temperature is stabilized within range of 0.02 K with automatic flow control of helium gas through the cold compressors by a heater in the bath. The control method is also useful to protect the system by mitigating large disturbance of the pressure and the mass flow rate. In the present study, the thermal hydraulic behavior of the system and the operational performance during ten plasma experimental campaigns are reported.

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Large helical device

Kaneko

2016

Magnetic Fusion Energy

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Results of the Excitation Test of the LHD Helical Coils Cooled by Subcooled Helium

Cited by 9 publications

References 6 publications

Reconsideration of Evaluation of Balance Voltages During a Normal Zone Propagation in the LHD Helical Coils

Reconsideration of Evaluation of Balance Voltages During a Normal Zone Propagation in the LHD Helical Coils

Operations of the Helium Subcooling System for the LHD Helical Coils during Ten Plasma Experimental Campaigns

Large helical device

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