Thermal stability analysis of EAST toroidal field feeder under new threshold

Fig. 4. Temperature margin and current shunt temperature of conductor under different background magnetic fields and operating currents (a) Temperature margin, (b) Current shunt temperature

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Fig. 5. Stability energy margin of feeder conductor under different operating currents (disturbance length 1 m, and disturbance time 0.01 s)

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Fig. 6. Stability energy margin of feeder conductor under different disturbance times and disturbance lengths (for 14.5 kA operating current) (a) Variation of stability energy margin with disturbance time, (b) Variation of stability margin with disturbance length

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Table 1. TF feeder low-temperature operation data over the years

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Table 1. TF feeder low-temperature operation data over the years

时间 Time	进口温度 Inlet temperature / K	进口压力 Inlet pressure / Pa	进口流量 Inlet flowrate / g·s^-1	出口温度 Outlet temperature / K
2015/06/04	5.09	$3.71 \times 10^{5}$	4.36	5.93
2016/01/26	4.98	$3.78 \times 10^{5}$	4.72	5.86
2017/07/07	5.11	$3.83 \times 10^{5}$	4.71	5.99
2018/06/04	5.05	$3.76 \times 10^{5}$	4.81	5.84
2019/04/06	5.13	$3.67 \times 10^{5}$	4.62	5.84
2020/05/12	5.22	$3.84 \times 10^{5}$	4.68	5.97
2021/05/10	5.17	$3.84 \times 10^{5}$	4.78	6.04
2022/05/07	5.23	$3.75 \times 10^{5}$	4.74	6.06

Table 2. Structural parameters of CICC

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Table 2. Structural parameters of CICC

参数Parameter	原有CICC Original CICC	新CICC New CICC
超导材料Superconducting materials	NbTi	NbTi
铜超比Copper-to-superconductor ratio	1.38	2.3
超导股线直径Diameter of superconducting strand / mm	0.87	0.73
铜股线直径Diameter of Cu strand / mm	0.98	0
铠甲直径Diameter of Jacket / mm	23	21
电缆截面积Cross section of cable / mm²	284.08	208.00
股线截面积The cross-sectional area of strands / mm²	177.69	125.56
超导体截面积Superconductor cross-sectional area / mm²	29.70	37.63
空隙截面积Helium in cable space / mm²	101.93	78.25
空隙率Void fraction	35.88	37.62

Table 3. Calibration parameters of feeder conductor
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Table 3. Calibration parameters of feeder conductor
参数
Parameter
$T_{c 0}$
/ K
$B_{c 20}$
/ T
C₀
/ AT·mm^-2
α β γ
数值Value 8.79 13.72 113 200 0.98 0.98 1.96

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Jie XIE, Weibin XI, Jinxing ZHENG, Ziming CHEN, Shuangsong DU. Thermal stability analysis of EAST toroidal field feeder under new threshold[J]. NUCLEAR TECHNIQUES, 2023, 46(10): 100601

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