Grill design for 1000 second lower hybrid current drive system for SST1 tokamak

Details Grill design for 1000 second lower hybrid current drive system for SST1 tokamak Grill design for 1000 second lower hybrid current drive system for SST1 tokamak

Sep 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aipc..485..482b&link_type=abstract

The thirteenth topical conference on radio frequency power in plasmas. AIP Conference Proceedings, Volume 485, pp. 482-485 (199

Computer Science

Plasma Heating By Particle Beams, Theory, Design, And Computerized Simulation

Scientific paper

In this paper we present detail design considerations for the grill structure designed to be used as the launching structure for the Lower Hybrid Current Drive (LHCD) system for 1000 second operation in Steadystate Superconducting Tokamak (SST1). The grill will comprise of 64 active subwaveguides having dimensions of 76mm×7mm, arranged in two rows with two dummy subwaveguides, one each on either side of the row. The grill is designed to radiate a power spectrum of parallel refractive index, centered at 2.25, with 90° phasing. The power flux in each subwaveguide is ~3 kW/cm2 for a rf power of 1 MW coupled to the plasma. To protect the grill from conducted and radiated heat loads, there will be a tile assembly around the perimeter of the grill structure. High heat loads on the protection tiles (~52 W/cm2) and the grill (6.8 kW, both radiated and resistive loss), demand careful and constant cooling. Thermal, electromagnetic and mechanical stresses have been analyzed for the grill and the tile assembly using ANSYS software. Analysis for the grill shows that the maximum operating temperature of the grill would be 75 °C, giving rise to a thermal stress of 18 MPa. Most critical tiles would be the corner tiles with an operating temperature of 412 °C and a thermal stress of 35 MPa, which is 83% of the yield stress of the graphite material. Maximum force developed on the grill due to plasma disruption has been estimated to be about 13 kN. Zr-Cr copper with adequate strength will be used to fabricate the grill structure. Wire-cut technique will be used to fabricate the grill, having an internal surface finish of 1.5 μm.

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