29 June 2012 Author: Lester M. Waganer, email@example.com-->
ARIES Documents -- Meetings ArchiveARIES Conference Call, 15 May 2012
Documented by L. Waganer
Les Waganer noted that the next ARIES meeting will be held in the Gaithersburg Hilton on Thursday, May 31st and half a day on Friday, June 1st. Al Opdenaker has completed the meeting room and hotel arrangements and has sent out that information to the team. Les Waganer sent out the preliminary draft meeting agenda on 5/15/12 for comment.
Les Waganer has sent out the final conference call minutes for the 23 April 2012 call. Mark Tillack has posted the final minutes on the ARIES web.
Farrokh Najmabadi requested all team members be prepared to discuss at the meeting their expected achievements by the end of their end of contract period as well as their expected achievements for an additional period of performance.
ARIES Technical Efforts
Reliability Modeling of the Divertor Components - Tom Weaver stated that his colleague has been loading the divertor plate model parameters into the computer model. The model currently is configured to evaluate a steady-state thermal loading condition and future dynamic modeling is anticipated. Tom will gather further modeling input data at the upcoming meeting.
Edge Plasma Physics - Tom Rognlien and Marv Rensink discussed their modeling of the plasma edge physics in the lower divertor region. In order to better visualize and discuss their work, Tom sent the team a PDF file of their code results for the ACT-1 detached divertor plasma solutions. The upper figure shows the steady-state solution with orthogonal SOL and divertor plate with Ne radiation. On the lower dome of this figure, there is both pumping and puffing to create the stable boundary. As shown in the lower figures there are steady state solutions for the outer divertor boundary with either pumping/puffing or a physical divertor plate. Slightly different plate configurations were suggested and Tom and Marv said they would consider analyzing these configurations. It is believed ITER is considering this pumping/puffing concept for scavenging impurities in a steady-state scenario. It might be able to be tested on D-IIID.
Power Core Plasma Modeling - Chuck Kessel has been comparing the TSC results to those of the ARIES Systems Code. He said the BetaN profiles at the plasma edge are not quite correct, but are probably adequate? The results will change when the new radial builds are implemented.
MHD Modeling - Mark Tillack discussed the design of the lower power core region for the self-cooled SiC blanket concept. The primary concern is even flow distribution to the individual modules and the annular channels surrounding the modules. One approach that Mark had proposed many years ago is called "flow balancing". In one embodiment, a conducting plate is used to connect parallel channels. It must not be excessively corroded by the LM coolant stream. Some experimental evidence exists (see Feuerstein, J. Nuc Mater 1996), showing compatibility between PbLi and W up to at least 600°C. More data above 600°C are needed.
Extent of Design Concept Modeling and Design - Chuck Kessel asked if the team is expected to complete full analyses and designs for all four physics/technology corner points or would it suffice for a lesser number, perhaps two. Farrokh thought it might be best to have the Advanced Physics case with both the Conservative (DCLL) and Advanced (SiC) Technology cases. He is hoping these could be concluded by the end of the year. These could be (easily?) augmented with the Conservative Physics cases at a later date. This will be a topic for discussion at the next project meeting.
Optimization of Steady-State Plasma Simulations - Alan did not present any results, but promised that he will present their results at the next meeting.
Power Core Design - Xueren Wang has defined the outboard region for the SiC blanket power core. He has incorporated the radial build and design suggestions from Laila's neutronics analysis. He is also addressing the coolant manifolds, plumbing piping, vacuum pumping ducts and sector maintenance. He is also using design influences from ARIES-AT.
Radial Build and TBR Progress - Laila El-Guebaly has defined the radial build for the SiC, self-cooled power core concept based on the 3D neutronics model. She has also addressed the shielding requirements in the vacuum ducts (and maintenance ports?). She has been iterating the design with Mark and Xueren to keep changes coordinated. The resultant TBR results look very good with a lithium6 enrichment of 60%. She is also assessing the neutron streaming in the blanket and shielding gaps back to the vacuum vessel.
Thermal Creep Analysis of the Divertor - Jake Blanchard has incorporated thermal creep into his analysis of the tungsten divertor. Early indications are that this will be a problem for the current design. Detailed results and potential design solutions will be presented at the next meeting.