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ARIES Documents -- Meetings Archive

ARIES Conference Call, 15 August 2001

Documented by L. Waganer

(ANL) Sze
(Boeing) Waganer
(DOE) -
(FPA) -
(GA) Petzoldt, Schultz
(GT) Abdel-Khalik, Yoda
(LANL) -
(LBL) Yu
(LLNL) Latkowski, Meier
(MIT) -
(NRL) Sethian
(PPPL) Heitzenroeder, Schmidt
(RPI) Steiner
(SNL) Olson
(UCSD) Mau, Miller, Najmabadi, Tillack
(UW) Hayes


Les Waganer mentioned Laila El-Guebaly has provided hotel and meeting information for the next ARIES meeting to be held 19-20 September in Madison, Wisconsin. You should contact Sue Ann Hubanks if you did not receive the information. Les will be assembling the agenda shortly, so please send him your anticipated presentation title, duration, and special scheduling needs. We intend to complete the meeting around 2:30-3:00 to allow sufficient time to make flight connections allowing return on 9/20. We prefer electronic versions of the presentations be provided to Paul Wilson early enough to assemble a complete electronic meeting file.

Farrokh Najmabadi renewed his request of abstract copies for the upcoming fusion conferences. It is important to list all contributors on abstracts to ensure proper credit.

Georgia Technology mentioned that they have received funding and are ěofficiallyî on board the ARIES team.


Systems Assessement

Ron Miller mentioned he had received some data on the manufacturing and inspection processes of coins/bills. Although the cost and quantity were similar to IFE targets, the process of printing or stamping is not considered to be analogous to the fabrication of targets. Don Steiner reported that Dave Petti, Lee Cadwallader, and Dan Goodin visited a chip manufacturer to assess the fabrication and inspection similarities. It was reported there were some applicable similarities. Data obtained from this visit will be presented at the upcoming ARIES meeting. John Sethian mentioned that the fuel pellets for the high-temperature, gas-cooled fission reactor might be a good process to consider.

Wayne Meier mentioned that he has been upgrading the HI driver code to improve modeling of the hybrid target with larger spot sizes. This work will help define a new strawman point design.

Chamber Physics

Don Haynes said he has been completing the write up of the analysis and results of the dry wall chamber physics for the ARIES journal article documentation.

Don asked if the team could narrow the choices for the sacrificial material pertaining to the wetted wall concept. A complete range of possibilities was offered, but the team noted that as the sacrificial layer is thin, this material need not be tritium breeding (i.e., lithium or lithium compound). Lead should be considered along with other possible materials. Porous structural or fabric walls are candidates that might be combined with a liquid spray over a bottom pool. The team suggested a possible range of chamber radii from 3 to 6 meters with 4.5 to 5.0 meters being more likely for a 1000 MWe plant. The equilibrium base pressure is TBD as it is dependent on the sacrificial material and operating temperature regime chosen and the compatibility with target heating and delivery conditions.

Don Haynes and John Pulsifer will be analyzing the recondensation capability of different sacrificial materials to determine equilibrium pressure and repetition rate.

Drivers and Beam Transport

Simon Yu mentioned that a key area to the success of the HIB channel transport is the definition and performance of the insulator that prevents high voltage breakdown between the beam and the wall and blanket elements in the area of the beam entrance to the chamber. Simon referenced possible HyLife insulator design approaches that might work, see the LBL Fusion Web Site for details. Simon noted that a SiC insulator had been assessed but SiC was too conductive. Simon suggested the ARIES team assess and recommend a suitable insulator material.

Vacuum System and HI Beam Layout

Phil Heitzenroeder reported that his budget has been expended and PPPL has ceased work on the vacuum system and HI beam layout. The most current results remains those presented at the July 2001 meeting.

Simon Yu noted that Leslie Bromberg has been working on some of the HI magnet design definition using high temperature superconductors. Simon thought Leslie would report his results at the September ARIES meeting.

Chamber Wall Engineering

Farrokh Najmabadi noted that RenČ Raffray is responsible for this technical area. He is currently in Germany, but is expected to return shortly and will present results on the overlap regions of the design and operating conditions at the September meeting.

Chamber Nuclear Analysis

Laila El-Guebaly was on vacation, thus no discussion was presented.

Final Optic Element Protection

TK Mau has been investigating effects of liquid metal contamination on the laser final optic elements, mainly the GIMM with an oxide coated aluminum mirror. He reported a thin film (arbitrarily set at 5 nm) slightly degrades the mirror performance, as shown below.

Liquid Metal (at 5 nm thickness) GIMM Degradation, %
Lithium 1.0 @ 248 nm
Tin 2.5 @ 248 nm
Na 0.0 @ 200 nm; 1.0 @ 312 nm
Pb 1.5 @ 450 nm

Target Fabrication, Injection, and Tracking

Ron Petzoldt noted that his analysis indicates that 2-g indirect-drive targets could be accurately delivered (± 0.3 mm axial) within a 3-meter radius chamber containing xenon gas known to an accuracy of ± 0.2 torr. Ron reported GA had successfully completed their Preliminary Design Review on the target injection and tracking project with their customer and are commencing the Detailed Design Phase.

Ron said that a Pd-coated DD target is being evaluated by NRL. A Pd-coated target is easier to fabricate and fill because of the higher Pd hydrogen permeability. GA is also spray-drying polyamic acid (polyimide precursor) polyamides onto mandrels in a fluidized bed and has demonstrated fabrication of a free-standing polyimide shell and smoothing of the shell, both in a mass-production process. Smoothing is accomplished by immersing the targets in liquid or vapor solvent. However, the shells are still far too rough to meet target specifications.

Off Normal Event Assessment

Don Steiner noted that the trip to Micron Technology, Inc. was to help determine or estimate off-normal events that might occur in production/inspection. Don also mentioned that UW was conducting off-normal event calculations..