ARIES Documents -- Meetings ArchiveARIES Conference Call, 31 Aug 2006
Documented by L. Waganer
The next conference call will be 19 September 2006.
Farrokh Najmabadi reported that the dates for the PPPL Project Meeting will be on 4 October and the Review Meeting will be on 5 October. He or Les will provide a draft agenda. Dale Meade has agreed to be the Review Chairman. Other review members are Jeff Harris (ORNL) and Wayne Reiersen (PPPL). Farrokh is trying to find another review member. Mike Zarnstorff is handling the meeting arrangements. The room is D318. Farrokh said he will present a short overview. In-depth talks would be Physics and Coils (Long Poe Ku), Systems Assessment (Jim Lyon), and Engineering/Safety (Rene Raffray). These talks will be previewed on the previous day during the Project Meeting and supplemented by talks that provide updated information since the last meeting. These supporting talks should be provided one week ahead to the main presenters so they can update their talks.
Divertor Design and Analysis- TK Mau provided a file to illustrate his latest divertor modeling results. The first set of results was for an upper and lower conformal plate divertor design offset from the VMEC-LCMS by 20 cm at the closest approach (tips of divertor were further away). A second case was a flat plate design. In this configuration, 697 of 1000 launched FL hit the divertor plates, but still too many hit the wall. He then launched them from several other locations. He also had a V-shaped divertor configuration. Xueren is currently modeling the conformal plates. It was suggested to use the conformal plates in the CAD design and the analysis can show the effects of shape and distance to LCMS. A pumping space must be provided between the divertor plates and the underlying blanket. The size of the plates may need to be enlarged.
ECH Design– Les Waganer is pressuring TK to provide locations and details about the ECH system. Xueren had suggested several locations on or near the horizontal centerline. The ECH port size would only be 25 cm x 25 cm including wall thicknesses. If the coolant tube must be cut, then an auxiliary port will be necessary that could be used for ECH. TK preferred to have the ECH launcher on the mid plane either close to the 0° or 60° degree location. Les thought he could accommodate the ECH in the Main Maintenance port.
Integrated Systems Assessment
Systems Code Analysis - Jim Lyon did not have any new results to report. He is continuing to update his code.
Neutronics Update – Laila El-Guebaly reported she is working on the decay heat for both the uniform and non-uniform blanket modules. She is looking for a representative temperature from UCSD at the onset of a LOCA.
She reported Paul Wilson has reported the 3-D NWL results. The average NWL is 2.6 MW/m2, which is about the anticipated value. However, the new peak NWL is 5.3 MW/m2, which is a peak to average value of 2.0 as compared to the previous estimate of 1.5. This peak NWL is difficult for the blanket to handle as it has been designed for a peak to average value of 1.5. Rene Raffray will have to reassess his design margin to accept this higher value. The peak occurs over only a small area. The minimum NWL is 0.32 MW/m2 near the tips of the plasma. Jim Lyon suggested altering the plasma temperature and density slightly that might affect the NWL. Laila will set up a conference call when the results for this change are completed. If this does not work, Les suggested locally increasing the distance of the wall from the LCMS to help mitigate the excessive NLW.