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ARIES Documents -- Meetings Archive

ARIES Conference Call, 30 September 2005

Documented by L. Waganer


Participants:
(ANL) -
(Boeing) Waganer
(DOE) -
(FPA) -
(FZK) -
(GA) Turnbull
(GT) -
(INL) -
(MIT) Bromberg
(NYU) Garabedian
(ORNL) Lyon
(PPPL) Ku
(RPI) Steiner
(UCSD) Mau, Malang, Najmabadi, Raffray, Wang
(UW) El-Gububaly

Administrative

Les Waganer mentioned the next phone call will be Tuesday, Oct 18. The next meeting will be all day Thursday, 17 November and Friday morning, 18 November. In order to prepare for the next meeting, all reactor parameters should be delivered to Jim Lyon on November 3, Thursday, so he adequate time to input a consistent set of reactor physics and engineering data. See the text below for the specific items. The status of these data will be discussed at the October 18 call.

Compact Stellarator Reactor Physics Basis

Physics Assessment of New Configurations – Long Poe Ku sent copies of both the NCSX-like and the MHH2 configurations to Jim Lyon and the UCSD team. Xueren’s magnetic analysis indicates 25% higher peak field than those provided to the Systems Code by L-P Ku, but this should not present a problem at this time. Adjustments by smoothing out the coils can be made later.

Divertor Heat and Particle Load Modeling – T.K. Mau will need the self-consistent coil parameters to generate MFBE files for divertor studies. He will confer with Long Poe Ku to obtain specific details to help design the divertor plate location, etc, in the absence of a coil set for the NCSX-ARE configuration.

Compact Stellarator Reactor Engineering Assessment

Coil Design and Analysis – Leslie Bromberg sent the needed coil data to Jim Lyon and Jim said it was sufficient. No cost complexity factor was provided for the coil winding or coil structure at this time. Leslie also provided the coil data to Laila El-Guebaly for the shielding analysis. The new insulator was not sufficiently defined, so it was decided to use polyimide as the placeholder insulator as long as the insulator limit does not influence the shield design.

Coil Structural Analysis – At the September meeting, it was mentioned that GA would be contacted to conduct a FEM analysis. However, Xueren Wang has determined he can have a FEM analysis for the coil structure completed by D. Williamson of ORNL.

Blanket and Shield Neutronic Analysis - Laila El-Guebaly will post a revised radial build on her web site for incorporation. The new build may reflect a thicker HT shield (+ 10 cm) to provide more protection for the manifolds. The new magnet materials will be incorporated. Laila needs a decision regarding placing a manifold in the shield-only region – Action to Raffray.

Compact Stellarator Integrated Systems Assessment

Systems Code Analysis – Jim Lyon mentioned he is working on the coil structure and scaling existing analysis results by B2r2 as a good approximation. To confirm the validity of the calculation, Jim will provide two extreme cases to Leslie for analysis. Farrokh was concerned about the magnitude of the peak fields in the cases where two coils are in very close proximity. Jim noted that the peak fields occur well away from the areas with close proximity between coils – should not be a problem. There was also a question about the aspect ratio of the coil winding pack. Jim uses a range of aspect ratios from 2 to 6. He will run two sets of extreme aspect ratios to determine the effect.

Jim needs all consistent engineering and physics data to him by November 3 so he can conduct his systems code runs for the November meeting.

General Comments

Farrokh Najmabadi told the team that he appreciated what has been accomplished, both at the September meeting and in the period after the meeting. The definition of the two strawman is coming together with consistent data. The team is cooperating to achieve unified results. We need to bring these design definitions to closure by November 3, so Jim has time to analyze and optimize the two approaches. The next telecon is on Tuesday, October 18th (314-232-7034).