Details

Autor(en) / Beteiligte

• Christopherson, A. R.
• Betti, R.
• Forrest, C. J.
• Howard, J.
• Theobald, W.
• Delettrez, J. A.
• Rosenberg, M. J.
• Solodov, A. A.
• Stoeckl, C.
• Patel, D.
• Gopalaswamy, V.
• Cao, D.
• Peebles, J. L.
• Edgell, D. H.
• Seka, W.
• Epstein, R.
• Wei, M. S.
• Gatu Johnson, M.
• Simpson, R.
• Regan, S. P.
• Campbell, E. M.

Titel

Direct Measurements of DT Fuel Preheat from Hot Electrons in Direct-Drive Inertial Confinement Fusion

Ist Teil von

• Physical review letters, 2021-07, Vol.127 (5), p.1-055001, Article 055001

Ort / Verlag

College Park: American Physical Society

Erscheinungsjahr

2021

Link zum Volltext

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• Hot electrons generated by laser-plasma instabilities degrade the performance of laser-fusion implosions by preheating the DT fuel and reducing core compression. The hot-electron energy deposition in the DT fuel has been directly measured for the first time by comparing the hard x-ray signals between DT-layered and mass-equivalent ablator-only implosions. The electron energy deposition profile in the fuel is inferred through dedicated experiments using Cu-doped payloads of varying thickness. The measured preheat energy accurately explains the areal-density degradation observed in many OMEGA implosions. This technique can be used to assess the viability of the direct-drive approach to laser fusion with respect to the scaling of hot-electron preheat with laser energy.