ARIES Documents -- Meetings ArchiveARIES Conference Call, 5 July 2006
Documented by L. Waganer
The next conference call will be on 20 July 2006.
Divertor Definition - TK Mau said that he was progressing on the modeling with the GORDON code with a wall offset from the plasma with the distance from the LCMS to the blanket around 28 cm and to the divertor around 5 cm. The team said that was not the correct intent as the decision in the last meeting (documented in the meeting minutes) was that the divertor SOL distance should be around 50 cm. If the SOL in that region is ~ 5 cm, the divertor will act as a limiter not a divertor. Jim Lyon was adamant that the divertor should be at least 30 cm from the LCMS. It also should be located at both top and bottom regions. It was recommended TK stop trying to use GORDON code and enlist Tom Kaiser, LLNL, to modify his NCSX code to model the ARIES-CS geometry. I believe TK agreed to initially position his divertor wall at 15 cm from LCMS.
Beta Assessment - Alan Turnbull is working on the Terpsicore code to model the wall and determine the estimated beta performance.
Compact Stellarator Integrated Systems Assessment
Systems Code Analysis - Jim has been working on other projects and has not had time to devote to ARIES since the June meeting.
Engineering and Physics Assessment
Power Core Design - Xueren Wang said the 7.75-m CAD details are now available on the ARIES web site. TK will send Greg Sviatoslavsky the offset data for the wall definition by July 17. Xueren is working on modeling the vacuum vessel penetrations and the coil structure. The bioshield wall and dome sketch provided by Les Waganer was reviewed by Brad Nelson, ORNL, and he thought it was a better approach to support the Cryostat and Bioshield top plate on the side wall of Bioshield as opposed to supporting with the Cryostat walls, see sketch below. The top Cryostat is isolated from the walls with a flexible bellows to not allow any load transfer into the Cryostat walls. Xueren is incorporating that detail into the CAD definition.
Safety Assessment - Brad Merrill has been refining his model to include the transition shield and blanket module. He is looking at the LOCA conditions with nuclear heating. He is assessing the impact of the current decay with a failure in the coil power supplies. He is also assessing the LOCA failure in the primary helium loops. He is determining the overpressure criteria to be consistent with ITER.
Power Core Engineering - Laila El-Guebaly said she confirmed with Leslie Bromberg that the coil structural material of choice is JK2LB, not JK2 based on the activation analysis.