AC Loss Characteristics of the KSTAR CSMC Estimated by Pulse Test

Lee, S.; Chu, Y.; Chung, Woosuk; Choi, Sung‐Min; Park, S.H.; Yonekawa, H.; Baek, S.; Kim, J.S.; Cho, K.W.; Park, K.R.; Lim, Byung Su; Oh, Y.K.; Kim, K.; Bak, J.S.; Lee, G.S.

doi:10.1109/tasc.2006.870541

Cited by 15 publications

(9 citation statements)

References 11 publications

(11 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Because the loss with long time constants can be eliminated by a periodic variation, the difference between the extrapolated and hysteresis losses may decrease. In fact, hysteresis loss measurements with the KSTAR central solenoid model coils agree well with the estimation when using a sinusoidal wave [6]. We plan to operate the LHD poloidal coils with a periodic field variation and make hysteresis loss measurements.…”

Section: Resultssupporting

confidence: 64%

“…The hysteresis loss in superconducting coils has actually been measured by extrapolating several pulse or cyclic excitation data sets with different sweep rates or frequencies. However, previous studies using other coils with CICC suggest that the extrapolated loss obtained by the above-mentioned method was much larger than the hysteresis loss estimated using the magnetic hysteresis of the strands or theoretical calculations [5,6]. Our measurements show similar behavior.…”

Section: Introductionsupporting

confidence: 67%

See 1 more Smart Citation

Hysteresis Loss in Poloidal Coils of the Large Helical Device

Takahata

Chikaraishi

Mito

et al. 2011

Plasma and Fusion Research

View full text Add to dashboard Cite

Hysteresis loss in poloidal coils of the Large Helical Device (LHD) has been measured during single-pulse operation. The superconductors of the coils are Nb-Ti cable-in-conduit conductors (CICC) cooled by forcedflow supercritical helium. The loss was measured by monitoring the enthalpy increase of the helium coolant between the inlet and outlet. Although the hysteresis loss was extracted by extrapolating several data sets from pulse excitations with different sweep rates, the extrapolated loss was much larger than the estimation using the magnetic hysteresis of the conductor. The anomalous increase in the loss is likely due to inter-strand coupling loss with long time constants from the order of 10 to 1000 s. The calculations show that the additional coupling loss behaves like a hysteresis loss.

show abstract

Section: Resultssupporting

confidence: 64%

Section: Introductionsupporting

confidence: 67%

Hysteresis Loss in Poloidal Coils of the Large Helical Device

Takahata

Chikaraishi

Mito

et al. 2011

Plasma and Fusion Research

View full text Add to dashboard Cite

show abstract

“…The was 41.1 ms at 10 kA, where is the coupling current time constant of the cable, and the superconductor geometry factor is 2 in our case [4]. Because in the KSTAR magnet is designed to be less than 60 ms, it is acceptable.…”

Section: Ac Loss Of the Csmcmentioning

confidence: 87%

“…The results and analysis of the AC losses of the CSMC were presented in [4]. The AC losses of the KSTAR CSMC have been measured by a calorimetric method.…”

Section: Ac Loss Of the Csmcmentioning

confidence: 99%

See 1 more Smart Citation

Analysis of the KSTAR Central Solenoid Model Coil Experiment

Chung

Chu

Lee

et al. 2007

IEEE Trans. Appl. Supercond.

Self Cite

View full text Add to dashboard Cite

The Korea Superconducting Tokamak Advanced Research (KSTAR) Central Solenoid Model Coil (CSMC) was tested at the National Fusion Research Center (NFRC) to verify the design and manufacturing engineering and to ensure reliable operation. The CSMC reached 8.6 T at 20 kA DC operation successfully. We also assessed the AC loss of the CSMC by means of both a sinusoidal wave with a DC offset as well as a triangular pulse. We derived a friction factor correlation of CSMC at room temperature and at cryogenic temperature (4 6 K). We also investigated the variation of the friction factor during current charging. The KSTAR PF coil simulation code was validated with inlet and outlet helium temperature, mass flow rate, and pressure drop from the experimental results. The operation temperature margin of the CS1 coil of KSTAR was calculated with the revised KSTAR PF coil simulation coil.

show abstract

Stability

Iwasa

2009

Case Studies in Superconducting Magnets

View full text Add to dashboard Cite

AC Loss Characteristics of the KSTAR CSMC Estimated by Pulse Test

Cited by 15 publications

References 11 publications

Hysteresis Loss in Poloidal Coils of the Large Helical Device

Hysteresis Loss in Poloidal Coils of the Large Helical Device

Analysis of the KSTAR Central Solenoid Model Coil Experiment

Stability

Contact Info

Product

Resources

About