Numerical investigation of Tokamak runaway current suppression by using massive deuterium-argon/neon gas mixture injection

Zhenzhe HAN; Pingwei ZHENG

doi:10.11889/j.0253-3219.2024.hjs.47.080601

NUCLEAR TECHNIQUES, Volume. 47, Issue 8, 080601(2024)

Numerical investigation of Tokamak runaway current suppression by using massive deuterium-argon/neon gas mixture injection

Zhenzhe HAN¹ and Pingwei ZHENG^1,2、*

Author Affiliations

¹School of Resource Environment and Safety Engineering, University of South China, Hengyang 421001, China

²Demonstration Base for International Science and Technology Cooperation on Nuclear Energy and Nuclear Safety, University of South China, Hengyang 421001, China

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Figures & Tables(9)

Fig. 1. Initial radial distribution of electron temperature (a) and density (b)

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Fig. 2. Evolution of plasma and a runaway current over time without gas mixture injection

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Fig. 3. Results of injecting a deuterium-argon gas mixture (n_D=9.2×10²⁰ m^-3, n_Ar=1.1×10¹⁹ m^-3) (a) Evolution of plasma current (solid lines), ohmic current (dotted lines), and runaway current (dashed lines) over time, (b) Evolution of the ohmic electric field over time for different normalized radial radii

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Fig. 4. Results of the variations in the platform runaway current with the injected deuterium-argon content (a) n_D=9.2×10²⁰ m^-3 is kept constant whilst the argon content is gradually increased, (b) n_Ar=4×10¹⁸ m^-3 is kept constant whilst the deuterium content is gradually increased

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Fig. 5. Results of the variations in the platform runaway current with the injected deuterium-neon content (a) n_D=9.2×10²⁰ m^-3 is kept constant whilst the amount of neon is gradually increased, (b) n_Ne=4.5×10¹⁸ m^-3 is kept constant whilst the deuterium content is gradually increased

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Fig. 6. Collisional dissipation effects on the runaway current at high density (n_e=10²² m^-3)

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Table 1. Results at different I_p and T_e0 values without gas mixture injection
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Table 1. Results at different I_p and T_e0 values without gas mixture injection
I_p / MA T_e0 / keV $I_{r e}^{p}$ / MA $I_{r e}^{p}$ /I_p
1.2 6.8 0.8 0.75
1.8 6.8 1.4 0.76
2.4 6.8 1.85 0.77
1.2 10 0.6 0.5
1.8 10 1.1 0.6

Table 2. Results of injecting the optimal content of deuterium-argon gas mixture

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Table 2. Results of injecting the optimal content of deuterium-argon gas mixture

I_p / MA	T_e0 / keV	n_D / m^-3	n_Ar / m^-3	n_Ar/(n_D+n_Ar)×100%	$I_{r e}^{p}$ / MA	$I_{r e}^{p}$ /I_p
1.2	6.8	7×10²⁰	4×10¹⁸	0.57%	0.14	0.11
1.8	6.8	1.4×10²¹	8×10¹⁸	0.57%	0.38	0.2
2.4	6.8	1.9×10²¹	9.5×10¹⁸	0.50%	0.59	0.25
1.2	10	4.5×10²⁰	3.5×10¹⁸	0.70%	0.12	0.1
1.8	10	1.1×10²¹	6.8×10¹⁸	0.62%	0.31	0.14
2.4	10	1.5×10²¹	8.8×10¹⁸	0.60%	0.5	0.2

Table 3. Results of injecting the optimal content of deuterium-neon gas mixture
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Table 3. Results of injecting the optimal content of deuterium-neon gas mixture
I_p/ MA T_e0/ keV n_D / m^-3 n_Ne / m^-3 n_Ne/(n_D+n_Ne)×100% $I_{r e}^{p}$ / MA $I_{r e}^{p} / I_{p}$
1.2 6.8 7×10²⁰ 4.5×10¹⁸ 0.64% 0.14 0.11
1.8 6.8 1.4×10²¹ 8.3×10¹⁸ 0.59% 0.37 0.2
2.4 6.8 1.9×10²¹ 9.7×10¹⁸ 0.51% 0.57 0.24

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Zhenzhe HAN, Pingwei ZHENG. Numerical investigation of Tokamak runaway current suppression by using massive deuterium-argon/neon gas mixture injection[J]. NUCLEAR TECHNIQUES, 2024, 47(8): 080601

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