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ARIES Documents -- Meetings Archive

ARIES Conference Call, 28 March 2006

Documented by L. Waganer


Participants:
(ANL) -
(Boeing) Waganer
(DOE) -
(FPA) -
(FZK) -
(GA) Turnbull
(GT) Abdel-Khalik, Yoda
(INL) Merrill
(MIT) -
(NYU) -
(ORNL) Lyon
(PPPL) Ku, Zarnstorff
(RPI) -
(UCSD) Mau, Najmabadi, Raffray,Tillack, Wang
(UW) El-Gububaly

Administrative

Laila El-Guebaly has arranged for a meeting room for the next meeting, 27-28 April 2006 at the University of Wisconsin, Madison. She arranged for a block of rooms at the Doubletree Hotel and has booked a group dinner for the evening of 27 April. Les Waganer will formulate the agenda, so please forward presentation titles for incorporation.

It was suggested we have another meeting between a planned September meeting (no date established) and the April meeting. We will either query the team by email or decide at the April meeting the future dates and locations.

Compact Stellarator Integrated Systems Assessment

Systems Code Analysis - Jim Lyon has been working on the systems code development, but stopped the development to create a systems baseline for the Engineering Team. He issued it to the team on 22 March 2006. This code result satisfied a TBR of 1.1, which resulted in a power core major radius of 7.5 m having an average NWL of 3.0 MW/m2. Rene Raffray asked Jim to create an additional code run for a major radius of 8 meters. Jim said he could alter the maximum NWL value to yield a case of the desired major radius. This would have a negative impact on the direct costs.

Compact Stellarator Reactor Engineering Assessment

Blanket and Shield Neutronic Analysis - Laila has completed most of her action items and forwarded the results to the Engineering Team and Jim Lyon for incorporation into the Systems Code. She created a radial build for the 7.5 m radius case, which satisfies the TBR = 1.1 criteria. Any design with a major radius less than 7.5 m or with a divertor area greater than 15 % of FW would not satisfy the TBR criteria. Jim Lyon asked Laila to provide a relationship between the TBR and divertor coverage fraction for a fixed major radius. She has been working with Xueren to define and analyze a new configuration that will have an acceptable neutron streaming through the helium cooling tubes. She received info from S. Malang on the divertor system and cooling pipes.

There was some question as to the modeling of the neutron source for the NWL distribution. Jim Lyon will contact Paul Wilson (UW) to determine the method used. Jim will then work with Wayne Houlberg to modify the plasma profile code appropriately.

Coil Structure Design and Analysis - Xueren Wang has finished most of the action items and is working on the remaining one. The results will be presented at the meeting. He forwarded all information to Jim Lyon for his code input. He has currently modeled the 7-meter case, which is valid for the new coil and plasma configuration, but has a TBR less than 1.1. The older 8.25 m case is no longer valid with the new ARE physics. After the final power core radius is established, he will create the drawings for the final reactor size.

Experimental Verification of Gas-Cooled T-Tube Divertor Performance - Said Abdel-Khalik reported they are working to verify the heat transfer coefficients of the slit-cooled divertor. They are also confirming the geometry of the slit and how the width varies along the length of the slit.

Safety Assessment - Brad Merrill is reviewing the pressurization of the cryostat. He wanted to know if the geometry is changing and he should either wait until the machine size finalizes or if he should use the current preliminary data. Rene would like to have the data before the meeting, if possible.

Overall Engineering Assessment - Rene Raffray thought the present 7.5-m design is close to the final design size, so we should be reasonably close on all our analyses.

Compact Stellarator Reactor Physics Basis

Divertor Heat and Particle Load Analysis and Geometry Development - TK Mau is running the GORDON GEOM code to define the particle and heat load on the configuration. He is trying to define the surface area and inclination of the divertor and baffle plates that will handle the prescribed thermal power limits. He wanted to position the divertor plates conformal with the LCMS, but Jim said that the divertor had to be further outside the LCMS. TK should look at other divertor configurations for other stellarator devices. The SOL is assumed to the 5 cm and should not be dependent on major radius. The divertor should be somewhere out around 20 cm from LCMS.

Plasma and Configuration Studies - Long Poe Ku has been making progress to improve the current plasma and coil configurations to achieve lower alpha losses. He has combined the features of the N3ARE and the SNS designs to achieve a better configuration. He has provided the plasma data to Jim, but he does not have the coil data yet.

Update on Beta Limits for ARIES-CS - Alan Turnbull is continuing to work with his codes to refine the modeling for more consistent results. He will report his results at the meeting.