Speaker
Description
Glow discharge cleaning (GDC) shall be used on ITER device to reduce and control impurity and hydrogenic fuel out-gassing from in-vessel plasma facing components. After first plasma, permanent electrodes (PEs) will be used to replace Temporary Electrodes (TEs) for subsequent operation. These PEs will be used inside vacuum vessel and during plasma operation, major disruption and vertical displacement events may cause huge electromagnetic forces on these PEs and destroy them. Especially for equatorial ports, the PE is closer to plasma, so analysis has to be done to understand the specification of these EM loads, and these loads will be used as input for structural analysis. This report presents results of transient electromagnetic analysis of electrode structural components during plasma disruption for the seven cases. The calculation is based on the ITER Global Model (IGM) for the EM analysis of vessel components. The method is inserting the model of GDC into the IGM, which provides a certain region for the GDC insertion. The eddy current distribution and the time-varying Lorentz force and torque moment acting on the GDC electrode are presented. According to the calculation results of 7 cases, the maximum moment is about 3.3kNm. From the results the severe case(s) can be determined and only this severe case will be considered if a structure design is updated and this will save lots of resources avoiding consider 7 cases again. Below is a picture showing the moments and forces under 7 different cases.
| Eligible for student paper award? | No |
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