ht-7 asipp surface analysis of clam steel,eurofer97 steel and w irradiated in ht-7 tokamak qiang...
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HT-7 ASIPP
Surface Analysis of CLAM steel,EUROFER97 steel and W Irradiate
d in HT-7 Tokamak
Qiang Li1,2 Qunying Huang1 Jinnan Yu3 Jiangang Li1 Yican Wu1 Xiaoxiong He1,2
1 Institute of Plasma Physics, Chinese Academy of Sciences, Hefei, Anhui, 230031, CHINA
2 Hefei University of Science and Technology, Hefei, Anhui, 230039, CHINA
3 China Institute of Atomic Energy, Beijing 102413, CHINA
HT-7 ASIPP
OUTLINEAbout CLAM steel,EUROFER97 steel and WExperiment procedure Sample Irradiation experiment Surface analysisResult and discussion Surface morphology Surface compositionconclusion
HT-7 ASIPP
About CLAM steel,EUROFER97 steel and W
CLAM steel and EUROFER97 steel • low activation ferritic/martensitic steel• Good properties for thermal and neutron irradiation
• Being considered as structural material and the first wall material in tokamak
HT-7 ASIPP
About CLAM steel,EUROFER97 steel and W
W• Refractory high-Z material• High melting ponit,low vapor pressure,good ther
mal conductivity,high temperture strength and sputtering resistance
• Being considered as plasma facing components
HT-7 ASIPP
Experiment procedure
Sample• Composition of CLAM steel, EUROFER97 steel( wt % )
pure multicrystal tungsten(~99.99% wt)• Size:15*7*1.5 mm • All samples were polished and cleaned with acetone and abs
olute alcohol,and then were dried by hot air.
Fe Cr Mn W Si V C Ta Ni
CLAM Bal 8.85 0.42 1.50 0.01 0.20 0.084 0.072 0.02
EU97 Bal 8.82 0.37 1.10 0.005 0.19 0.10 0.068 0.021
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Experiment procedure
Irradiation experiment• HT-7 tokamak
medium size with limiter, and R=1.22m, a=0.285m, BT≤2.2T
the first wall material is 1Cr18Ni9Ti stainless steel, and the limiter material is graphite coated with SiC
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Experiment procedure
• Sample shelf and its position in HT-7
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Experiment procedure
• Plasma average parameters during experiment center: boundary: Ip =125kA ne =1.5*1019m-3
Te =700eV Ti =450eV
All samples were irradiated by 802 shots , total irradiation time is about 1200 seconds
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Experiment procedure
Surface analysis• Scanning Electron Microscope (SEM)• X-ray Photoelectron Spectroscopy (XPS)
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Result and discussion
Surface morphology• CLAM
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Result and discussion
• EUROFER97
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Result and discussion
• W
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Result and discussion
• Number and diameter of blisters
it seemly equal for blister number in CLAM steel surface and EUROFER97 steel surface, and most of blister diameter is less than 1μm
the blisters in W surface are very little ,their diameter are more than 1μm
1
10
100
1000
10000
<0. 2μ m 0. 2- 0. 5μ m 0. 5- 1μ m >1μ m
Bl i ster di ameter
Numb
er o
f bl
iste
r
CLAMEUROFER97W
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Result and discussion
• SummaryThe surface blisters of CLAM steel and EUROFER97 st
eel are very denseThe blisters seemly range along line in the suface of two
kinds of steelsBlisters are observed in the surface of WBlisters are not observed in the surface of all samples w
hich are far to center plasma
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Result and discussion
Surface composition• Si Si peaks are obvious in No.2
samples surface, but it is not obvious for No.1 samples
• Other elements
No obvious change for No.1 samples and No.2 samples
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conclusion
Relative to W,CLAM steel and EUROFER97 steel are more easy to blister when irradiated by plasma
low activation ferritic steel can be used as fisrt wall materials when considering its plasma irradiation resistance ability
If select W as the plasma facing materials,such as divertor armor, more deep researchs must be proceeded