ARIES Documents -- Meetings ArchiveARIES Conference Call, 19 March 2013
Documented by L. Waganer
Les Waganer mentioned the next ARIES meeting is scheduled for full day on Tuesday, 21 May 2013 and a half a day on Wednesday, 22 May 2013. Al Opdenaker is making arrangements for the meeting room and attendees' rooms, perhaps at the Hampton Inn.
The next ARIES conference call is scheduled for Tuesday, 23 April 2013 at the usual time.
Many of the team members said they had finished or were working on drafts of their final reports.
Mark reported that he and Farrokh Najmabadi attended a US/JA workshop in Japan on fusion power plants. Representatives from China and South Korea also participated. The presentations have been posted on the ARIES Meetings web site.
ARIES Technical Efforts
Materials - Arthur Rowcliffe was not able to attend the call due another commitment. He sent a note to Les Waganer, in which he wrote: "I do have people at ORNL working on the materials contributions to the ACT-1 summary papers. Lance Snead is doing the tungsten materials, Yutai Katoh is doing the SiC/SiC , David Hoelzer and Lizhen Tan are doing the RAFS/ODS and I am preparing the contribution on the 3Cr-WV steels." Mark asked if these contributions were to be incorporated into the other papers, such as Jake Blanchard's paper. Mark and Jake will confirm with Arthur.
Progress at the GT Helium Test Facility - Minami Yoda said that the GT helium loop has been successfully leak-tested at its normal operating pressure of 10 MPa at temperatures near ambient over run times of more than 1 hour. The GT group is currently assessing how to protect the surface of the tungsten-alloy HEMJ test section from oxidation, and will first try flowing argon over the surface. A Japanese group (Drs. Muroga from NIFS, Kunugi and Yokomine from Kyoto University, and Satake and Yuki from the Tokyo University of Science) visited recently to review the helium loop and discuss possible future experiments. They were interested in whether GT had observed any flow laminarization. To date, the GT group has not observed any anomalous thermal-hydraulics behavior in their cooled surface temperature or pressure drop data that would indicate laminarization. The GT group is waiting at present for programmatic guidance regarding future experiments with the Japanese group.
Modeling Radiating Edge Plasmas - Marv Rensink noted they have no new results to report, but they continue to make progress. They are also writing up their analyses and reported results for the physics document. They have defined two simulation cases that will serve as the baseline case for fully and partially detached plasmas.
System Costing - Les Waganer reported that he had completed the documentation of the ARIES historical data and costing algorithms. He has transmitted this lengthy document to Mark and Farrokh for review.
Les has examined the capital and operating costs for ARIES-ACT-1 and compared those costs to those of ARIES-AT. He sent this cost comparison document to Mark and Farrokh for review. One concern was that the larger ACT capital costs were higher, but the operating costs were less - this is due to the reduced Fixed Charge Rate adopted for ARIES in 2009 to be consistent with the GEN-IV cost analysis. Mark and Les defined some new material costs that were not being handled appropriately.
System Code Updates and Upcoming Runs - Mark Tillack noted that he has been working with Les to correct and update the costing in the systems code. He is readying the code for analyzing the ACT-2 runs. He has incorporated the physics data set from Chuck and is planning on running the code on the PPPL computer cluster, when available.
Documentation of ACT Physics Analyses - Chuck Kessel has been working on the documentation of the ACT-1 design and is developing the ACT-2 physics analyses. There are about five distinct ACT-2 design points. Chuck is trying to obtain cases with a low beta around 4, but the best he has been able to define is a beta around 4.25. All cases he has analyzed are MHD stable and there are no predicted fast particle losses. The PF coil set definition is complete. The Ion Cyclotron system does provide some heating and some current drive, but it works best for controlling the Q-profile. Chuck is currently working on the definition of the heat fluxes on the divertor and first wall. He is also finalizing the tritium burn-up fraction, which is currently in the range of 5-6%. He thinks the final value will be higher with improved assumptions.
Chuck attempted to contact the PPPL vacuum pumping experts to gain their insight as to the efficiency of the proposed ACT vacuum pumping system options. He did not make contact and will try again in the near future.
Manifolding and Routing of Coolant Pipes - Christina Koehly explained that she eliminated the Y-connectors in the coolant routing and implemented a set of parallel pipes suggested by Farrokh Najmabadi that will provide a more uniform parallel flow in the lower magnetic field. The joints of the integral set of parallel pipes could accept a small amount of leakage between pipes with no external leakage.
Power Core Design - Xueren Wang mentioned that he is completing his document on the ACT-1 power core design along with the related CAD drawings of the core components. He is also developing the ACT-2 power core design envelope and preliminary layout of core components.