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Experimental achievement and signatures of ignition at the National Ignition Facility

Author(s)
Zylstra, A.B.; Kritcher, A.L.; Hurricane, O.A.; Callahan, D.A.; Ralph, J.E.; Casey, D.T.; Pak, A.; Landen, O.L.; Bachmann, B.; Baker, K.L.; Berzak Hopkins, L.; Bhandarkar, S.D.; Biener, J.; Bionta, R.M.; Birge, N.W.; Braun, T.; Briggs, T.M.; Celliers, P.M.; Chen, H.; Choate, C.; Clark, D.S.; Divol, L.; Döppner, T.; Fittinghoff, D.; Edwards, M.J.; Gatu Johnson, Maria; Gharibyan, N.; Haan, S.; Hahn, K.D.; Hartouni, E.; Hinkel, D.E.; Ho, D.D.; Hohenberger, M.; Holder, J.P.; Huang, H.; Izumi, N.; Jeet, J.; Jones, O.; Kerr, S.M.; Khan, S.F.; Geppert Kleinrath, H.; Geppert Kleinrath, V.; Kong, C.; Lamb, K.M.; Le Pape, S.; Lemos, N.C.; Lindl, J.D.; MacGowan, B.J.; Mackinnon, A.J.; MacPhee, A.G.; Marley, E.V.; Meaney, K.; Millot, M.; Moore, A.S.; Newman, K.; Di Nicola, J.-M. G.; Nikroo, A.; Nora, R.; Patel, P.K.; Rice, N.G.; Rubery, M.S.; Sater, J.; Schlossberg, D.J.; Sepke, S.M.; Sequoia, K.; Shin, S.J.; Stadermann, M.; Stoupin, S.; Strozzi, D.J.; Thomas, C.A.; Tommasini, R.; Trosseille, C.; Tubman, E.R.; Volegov, P.L.; Weber, C.R.; Wild, C.; Woods, D.T.; Yang, S.T.; Young, C.V.; ... Show more Show less
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Abstract
An inertial fusion implosion on the National Ignition Facility, conducted on August 8, 2021 (N210808), recently produced more than a megajoule of fusion yield and passed Lawson’s criterion for ignition [Phys. Rev. Lett. 129, 075001 (2022)]. We describe the experimental improvements that enabled N210808 and present the first experimental measurements from an igniting plasma in the laboratory. Ignition metrics like the product of hot-spot energy and pressure squared, in the absence of self-heating, increased by ∼35%, leading to record values and an enhancement from previous experiments in the hot-spot energy (∼3×), pressure (∼2×), and mass (∼2×). These results are consistent with self-heating dominating other power balance terms. The burn rate increases by an order of magnitude after peak compression, and the hot-spot conditions show clear evidence for burn propagation into the dense fuel surrounding the hot spot. These novel dynamics and thermodynamic properties have never been observed on prior inertial fusion experiments.
Description
Submitted for publication in Physical Review E
Date issued
2022-05
URI
https://hdl.handle.net/1721.1/158684
Department
Massachusetts Institute of Technology. Plasma Science and Fusion Center
Journal
Physical Review E
Publisher
APS
Other identifiers
22ja018

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