ELM mitigation with SMBI-CJI fuelling in HL-2A H-mode plasmas. C. Y. Chen, L. H. Yao, B.B. Feng, Z. B. Shi, W.L. Zhong, J. Cheng, D. L. Yu, X. R. Duan Southwestern Institute of Physic 2012/05/17. SMBI & CJI Fuelling deposition area ELM mitigation ELM mitigation with SMBI
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ELM mitigation with SMBI-CJI fuelling in HL-2A H-mode plasmas
C. Y. Chen, L. H. Yao, B.B. Feng, Z. B. Shi, W.L. Zhong, J. Cheng, D. L. Yu, X. R. Duan
Southwestern Institute of Physic
SMBI & CJI
Fuelling deposition area
ELM mitigation with SMBI
ELM mitigation with CJI
Summary and discussion
Solid / liquid
The gas state changes follow the isentrope, over the saturated vapor pressure line, molecular combined together to clusters in the beam.
The gas expands adiabatically, the flow velocity increases and Mach number continues to increases to M>>1 in the zone of silence.
Rayleigh scattering and electron fluorescence method to measure the clusters.
Pulse duration: 2 ms
Delay time: ~1 ms
Pressure: 1.45 MPa
Pulse duration: 2 ms
Delay time: ~ 0.8 ms
SMBI parameters for shot 14045 (H-mode) ：P = 1.2 MPa, pulse duration 3 ms, separatrix on r = 37 cm, D particles deposited area around r = 36.5 cm。
Bt： 1.4 T
IP： 150 ~ 180 kA
Ne： 1.4 ~ 2.4
ECRH：1 ~ 1.5 MW
NBI： 0.5 ~ 0.8 MW
ELMs mitigation with SMBI (a)，CJI (b)，He SMBI (c).
~ 2-3.5 are achieved.
Multi - CJI
Pressure: 1.4 MPa
Duration: 2 ms
Power: 1 MW NBI
Pressure: 1.1 MPa
Duration: 4 ms
Pressure: 4 MPa
Duration: 0.6 ms
Temperature: - 156 ℃
The comparison of SMBI and CJI on ELM mitigation
CJI could inject deeper and may fuel to the pedestal top in HL-2A.
Experiment results show that SMBI & CJI fuelling are able to mitigate ELM on HL-2A.
CJI fuelling has the potential to control ELM on larger fusion device.
Larger cluster deeper injection?
CJI benefit from deeper injection for ELM mitigation?
CJI fuelling have the potential to control ELM on larger fusion devices?
Thank you for your attention!