University of California, San Diego Center for Energy Research. Simulations investigating the effect of a DT-ice-covered cone tip on the implosion of a re-entrant cone-guided ICF capsule J. Pasley - University of California San Diego R. Stephens – General Atomics. Abstract
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University of California, San Diego
Center for Energy Research
Simulations investigating the effect of a DT-ice-covered cone tip on the implosion of a re-entrant cone-guided ICF capsuleJ. Pasley - University of California San DiegoR. Stephens – General Atomics
Previous simulations of re-entrant cone-guided fast ignition capsule implosions have investigated the interaction of the imploding shell with the gold cone. Here we present simulations showing the effect of DT-ice layering onto the cone tip itself: a situation that may be difficult to avoid in the manufacture of cryogenic targets. 2d radiation hydrodynamic simulation results using the new ‘h2d’ code show a range of possible outcomes. Preheat levels are shown to be of critical importance in determining late time behavior.
2-D spherical (fine)
1-D simulations of gas density sensitivity
Initial interface pos.
Lineout of above at r=0
(Early time point chosen to avoid errors associated with rezoning)
1-D simulations of interface motion
Compression is sensitive to density in central low density region – ablation of significant ice-on-cone layers could have a similar effect.
50mm thick ice
30mm thick ice
This was just a quick ‘look-see’ at the effects of the ice layer. Need to extend to optimised FI-specific capsule designs.
H2d burn package presently incompatible with hydro package – this should be fixed soon.
2-D spherical (coarse)
20mm thick ice
10mm thick ice
Power matched drives with different spectra:
(note cone is too thin (10mm) and shock breaks through)
Red: 120eV Planck spectrum
Green: 400eV Planck spectrum
Blue : 1keV Planck spectrum
 HYADES and h2d are commercial products of Cascade Applied Sciences Incorporated, 6325 Trevarton Drive, Longmont, CO 80503. Electronic mail: [email protected]
 J. Pasley et al, Physics of Plasmas 13, 032702 (2006)
Gold motion is sensitive to thickness of ice layer but appears less sensitive to the preheat spectrum
Supported by GA internal funds and the Fusion Science Center