General Action Items or Observations
|a.||Variation 1:||P/FW/VV1/B/C/VV2||Blanket outside VV|
|a.||Variation 2:||P/FWCB/B/VV1/C/VV2||FW is a conductance barrier|
|a.||Variation 3:||P/FW/B/C/VV1/VV2||VV outside coil|
|a.||Variation 4:||P/FW/B/VV1/VV2||Vacuum Vessel is TF Coil|
Specific Action Items
The protection requirements of the VV in this geometry (e.g. 1 ppm He, dpa limits, etc.) will be checked through nuclear analysis (M. Youssef).
Mechanical Design Group (Brad Nelson) will examine how this configuration simplifies maintainability and how the protecting liquid layer could be formed. The kind of coolant in the VV will be explored (H2O, He, hydrogen-bearing material, Li, etc.). Kathy McCarthy will talk about hydrocarbons next meeting.
- Critical review of impact of evaporated liquid (lithium, lead ) on plasma performance. Examine allowable evaporation rate and sputtering limits (there is a sputtering report about lead on the web, Mike Ulrickson)
- Define the plasma functional requirements that should be met to start plasma. (heating, fueling, control field, removing alpha particles, etc.)
- Provide UCLA (and others) with a representative bremsstrahlung spectrum with typical line radiation from impurities (agree on a standard temperature profile and categorize/parameterize it for impurities). Currently, M. Youssef (UCLA) is using ITER plasma radiation for surface heating and will compare impact of various spectra on volumetric heat deposition in Li, Flibe, and Li17Pb83 liquid layers.
- Provide definition of representative physical penetration (circular, rectangular, triangular shape and dimension) for heating, fueling, and diagnostics.
- Merits/disadvantages of using rectangular FW as opposed to FW that follows the contours of plasma edge. Examine the issue of the need to have a conducting FW (a trade-off question).
- UCLA (N. Morley) will examine the EM forces on the moving liquid (i.e. include MHD in the analysis) which could lead to instabilities. Consider turbulence in the falling liquid layer.
- UCLA (Alice Ying) will examine evaporation of falling liquid as a mechanism to remove heat. Will work with PPPL (Bob Woolley) as needed on its concept.
- Dai kai Sze will perform more detailed thermal analysis of that concept by next meeting, including heat exchangers.