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Investigation of probe surfaces after ion cyclotron wall conditioning in ASDEX upgrade
For the first time, material analysis techniques have been applied to study the effect of ion cyclotron wall conditioning (ICWC) on probe surfaces in a metal-wall machine. ICWC is a technique envisaged to contribute to the removal of fuel and impurities from the first wall of ITER. The objective of this work was to assess impurity migration under ICWC operation. Tungsten probes were exposed in ASDEX Upgrade to discharges in helium. After wall conditioning, the probes were covered with a co-deposited layer containing D, B, C, N, O and relatively high amount of He. The concentration ratio He/C+B was 0.7. The formation of the co-deposited layer indicates that a fraction of the impurities desorbed from the wall under ICWC operation are transported by plasma and deposited away from their original location. Keywords: ICWC, Erosion-deposition, Fuel removal, Ion beam analysis, ASDEX Upgrade
Investigation of probe surfaces after ion cyclotron wall conditioning in ASDEX upgrade
For the first time, material analysis techniques have been applied to study the effect of ion cyclotron wall conditioning (ICWC) on probe surfaces in a metal-wall machine. ICWC is a technique envisaged to contribute to the removal of fuel and impurities from the first wall of ITER. The objective of this work was to assess impurity migration under ICWC operation. Tungsten probes were exposed in ASDEX Upgrade to discharges in helium. After wall conditioning, the probes were covered with a co-deposited layer containing D, B, C, N, O and relatively high amount of He. The concentration ratio He/C+B was 0.7. The formation of the co-deposited layer indicates that a fraction of the impurities desorbed from the wall under ICWC operation are transported by plasma and deposited away from their original location. Keywords: ICWC, Erosion-deposition, Fuel removal, Ion beam analysis, ASDEX Upgrade
Investigation of probe surfaces after ion cyclotron wall conditioning in ASDEX upgrade
A. Garcia-Carrasco (author) / P. Petersson (author) / T. Schwarz-Selinger (author) / T. Wauters (author) / D. Douai (author) / V. Bobkov (author) / R. Cavazzana (author) / K. Krieger (author) / A. Lyssoivan (author) / S. Möller (author)
2017
Article (Journal)
Electronic Resource
Unknown
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Wall conditioning effects and boron migration during boron powder injection in ASDEX Upgrade
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