ARIES Documents -- Meetings ArchiveARIES Conference Call, 27 May 2004
Documented by L. Waganer
Les Waganer mentioned the next ARIES meeting will be held at the University of Wisconsin – Madison on Wednesday, 16 June 2004 (all day) and Thursday, 17 June (morning only). This half day agenda will allow participants to make flight connections that afternoon. There will be a tour of the HSX, Helically Symmetric eXperiment, on Thursday morning.
The next meeting is scheduled for September, and the specific dates and meeting location will be discussed at the June meeting.
Status of ARIES-CS Action Items and Presentation Material for Meeting
Plasma and Coil Optimization - Long-Poe Ku said he has been obtaining some good data on the CS configurations he introduced at the March meeting. The alpha confinement with the coil sets is encouraging. He is trying to validate some of the preliminary data obtained. The configuration tends to produce reasonable shaped coils with rational plasma surfaces, although it is not completely conforming to QAS conditions. The configuration has strong negative shear and is a different configuration from NCSX.
Physics Assessment of a Two-Field Period Reactor – Paul Garabedian has been looking at a two-field, 8-coil set configuration he had defined previously. He is looking primarily at transport data and assessing field ripple at the plasma surface for shape and magnitude as well as alpha losses. He intends to calculate the alpha losses and collaborate with Long-Poe Ku to verify his code is reasonable.
Alpha Particle Loss Calculations - T.K. Mau has been working with the Orbit 3-D code to predict alpha particle losses for Compact Stellarators. He is looking at finite beta equilibrium cases with bootstrap current conditions. He has been getting particle orbits from GA modeling codes. He will report his findings at the June meeting
Systems Code Analysis - Jim Lyon reported he has been analyzing only the Long-Poe Ku data sets (18 coil sets) and has not been successful with modeling the Garabedian two-field data because he did not have the geometry and field data. He is concerned about the permissible neutron wall loading conditions of 2.5 MW/m2 average with a peaking factor of 2. René and Laila thought that might result in values too high for the solid breeder blanket and a peak value of 4.5 MW/m2 might be more reasonable. Jim has run cases with beta values of 4 and 6%. Picking the NWL as a variable, the major and minor machine radius was determined. He has been observing a problem with impurity density profile effects at the edge.
Liquid-Protected Divertors – Said Abdel-Khalik noted they had been working on the thermal gradient effects for a thin liquid- protected first wall. He has found a generalized non-dimensional solution for the maximum temperature gradient for a variety of proposed heat transfer media (Li, LiPb, Flibe, Sn). Laila proposed to add gallium to the list if the data is available.
Neutronic Analysis – Laila El-Guebaly has been working on the neutron wall loading distribution for a compact stellarator configuration. This has been analyzed with a CAD model coupled with MCNP code to analyze the complex stellarator surface.
Power Core Engineering - René Raffray said that they are working on the definition of a solid breeder blanket for a Compact Stellarator reactor. Xueren Wang posted the blanket configuration and geometry on the ARIES Web site for assessment and comment. They used Laila’s radial build to help design the blanket approach. He feels the maximum NWL should be around 5 MW/m2 with an average around 3 MW/m2.