ARIES Documents -- Meetings ArchiveARIES Conference Call, 20 July 2006
Documented by L. Waganer
The next conference call will be on 10 August 2006.
Divertor Design - TK Mau worked with Tom Kaiser (LLNL) last week on using his field line tracing code to study the divertor geometry and location for ARIES-CS. Four plates per period are used with 15 cm offset from the LCMS. 2000 field lines are run from the LCMS with a diffusion coefficient of 1 m2/s. The run was successful with 1425 hitting OB divertors, 465 hitting IB divertors and 110 hitting shadow region or baffle plates. None hit the wall that is 30 cm from the LCMS. The strike points as shown on a (theta, phi) plot indicate a reasonable spread. These strike points will need to be shown in real space and inclination angles to the plate are to be calculated to estimate the heat load distribution. Jim suggested the plates should be pulled back further to 30 cm from the LCMS. Plate optimization will be done using this code.
The first wall shape with a non-uniform offset from the LCMS in order to accommodate the divertors between the plasma and the blanket is being calculated using the OFFSET code. There is a need to talk to Art Brooks (PPPL) to ensure the data is done correctly.
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
Divertor Numerical Analysis and Experimental Validation - Said Abdel-Khalik gave a presentation at the Karlsruhe Research Center (FZK) on Georgia Tech's experimental and numerical work on the thermal performance of the gas-cooled T-tube divertor. The presentation was well received. Possible improvements in the experimental test facility to examine other divertor geometries were discussed.
Neutron Wall Loading Update - Paul Wilson has modeled the neutron source (received from J. Lyon) for MCNP with the FW conforming to the plasma. He will start generating the NWL profile next week after the ITER meeting at UW. As soon as UW receives the new FW shape, Paul will regenerate the actual NWL profile for the non-uniform offset needed to accommodate the divertor.
A new capability has been added to the CAD/MCNPX system that allows a direct assignment of the materials from the CAD to the various components, eliminating the need for hand-inputting the data to the MCNPX code. UW has not received the CAD input data for the in-vessel components from UCSD to confirm the overall TBR and Mn.
Report on 8th IAEA TM on Fusion Power Plant Safety (July 10-13, 2006, Vienna, Austria) - Laila El-Guebaly presented the recycling/clearance scheme for managing the fusion radwaste at the meeting and the talk was well received. The summary report by W. Gulden (EFDA) on "decommissioning and waste" includes Laila's recommendations of minimizing the waste by recycling and clearance. Future fusion studies will consider the recycling and clearance options, avoiding the geological disposal, meaning no radwaste burden on future generations.