Campaign integrated dust and erosion – EAST

J.S Hu, J.G Li and EAST team

hujs@ipp.ac.cn

Institute of Plasma Physics, Chinese Academy of Sciences, Hefei, Anhui 230031, China

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Sept. 15-18, 11th ITPA-SOL/DIV meeting, Nagasaki, Japan

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Outline

• Introduction

• Erosions/Depositions

• Dust

• summary

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Plasma operation in 2008 campaign• New carbon Plasma facing components• Shots number:#5132-9382, total 4250 shots;• Configurations: Limiter & Divertor with single/Double

null;• Main parameters of plasma:

– Bt~8.0KA;– Max. LHCD power: 800kW;– max. ICRF power: 260kW;– Max. Plasma current: 600kA;– Normal Plasma density: 1~4x1019/cm3.– Long plasmas

• ~20S, 250kA, ne~0.8x1019/cm3, 400kW(LHCD)• ~10S, 400kA, ne~1.5x1019/cm3, 400kW(LHCD)

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Main PSI issues for near futureProviding Useful Information for ITER

• Full C PFC (-2010) 2 MW/m2

W/Cu diverter(-2014), 10MW/m2

Full W PFC (-2016)

• RF wall conditioning techniques in divertor devices (cleaning, isotopic control, boronization).

• Develop Tritium removal techniques that could be applicable to ITER.

• Steady-state erosion, redeposition and dust formation.

• In-situ control of T-codeposition and inventory by surface temperature control.

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Dust during plasma discharges ASIPP

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#5674#6599

#7097

•In many shots, dusts were observed by CCD camera due to unfavorable position control.

Erosion/Deposits on walls

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Dust location

• SOL zones at low field side • Both side of movable limiters• Near GDC anodes• On/near ICRF antenna for wall

conditioning• On/near coils box for fast control• ……

• Window tubes • In the gaps

Dust on/near ICRF antenna

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Dust on both sides of movable limiters ASIPP

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Dust near GDC anodes

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Dust

Dust on/near coil box ASIPP

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Dust integration and summary

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•Erosion seemed on the wall at high field side and movable limiters due to the lose of position control.•Most dust in tile gaps, SOL zones at low field sides, windows tubes…•Total collected dust was 4.05g.•~1mg/shot.