Gianluca Gregori: Publications

Interaction of a highly radiative shock with a solid obstacle

PHYSICS OF PLASMAS 24:8 (2017) ARTN 082707

Authors:

M Koenig, T Michel, R Yurchak, C Michaut, B Albertazzi, S Laffite, E Falize, LVB Som, Y Sakawa, T Sano, Y Hara, T Morita, Y Kuramitsu, P Barroso, A Pelka, G Gregori, R Kodama, N Ozaki, D Lamb, P Tzeferacos

Transition from Collisional to Collisionless Regimes in Interpenetrating Plasma Flows on the National Ignition Facility.

Phys Rev Lett 118:18 (2017) 185003-185003

Authors:

JS Ross, DP Higginson, D Ryutov, F Fiuza, R Hatarik, CM Huntington, DH Kalantar, A Link, BB Pollock, BA Remington, HG Rinderknecht, GF Swadling, DP Turnbull, S Weber, S Wilks, DH Froula, MJ Rosenberg, T Morita, Y Sakawa, H Takabe, RP Drake, C Kuranz, G Gregori, J Meinecke, MC Levy, M Koenig, A Spitkovsky, RD Petrasso, CK Li, H Sio, B Lahmann, AB Zylstra, HS Park

Abstract:

A study of the transition from collisional to collisionless plasma flows has been carried out at the National Ignition Facility using high Mach number (M>4) counterstreaming plasmas. In these experiments, CD-CD and CD-CH planar foils separated by 6-10 mm are irradiated with laser energies of 250 kJ per foil, generating ∼1000 km/s plasma flows. Varying the foil separation distance scales the ion density and average bulk velocity and, therefore, the ion-ion Coulomb mean free path, at the interaction region at the midplane. The characteristics of the flow interaction have been inferred from the neutrons and protons generated by deuteron-deuteron interactions and by x-ray emission from the hot, interpenetrating, and interacting plasmas. A localized burst of neutrons and bright x-ray emission near the midpoint of the counterstreaming flows was observed, suggesting strong heating and the initial stages of shock formation. As the separation of the CD-CH foils increases we observe enhanced neutron production compared to particle-in-cell simulations that include Coulomb collisions, but do not include collective collisionless plasma instabilities. The observed plasma heating and enhanced neutron production is consistent with the initial stages of collisionless shock formation, mediated by the Weibel filamentation instability.

Magnetic field production via the Weibel instability in interpenetrating plasma flows

PHYSICS OF PLASMAS 24:4 (2017) ARTN 041410

Authors:

CM Huntington, MJ-E Manuel, JS Ross, SC Wilks, F Fiuza, HG Rinderknecht, H-S Park, G Gregori, DP Higginson, J Park, BB Pollock, BA Remington, DD Ryutov, C Ruyer, Y Sakawa, H Sio, A Spitkovsky, GF Swadling, H Takabe, AB Zylstra

Numerical modeling of laser-driven experiments aiming to demonstrate magnetic field amplification via turbulent dynamo

PHYSICS OF PLASMAS 24:4 (2017) ARTN 041404

Authors:

P Tzeferacos, A Rigby, A Bott, AR Bell, R Bingham, A Casner, F Cattaneo, EM Churazov, J Emig, N Flocke, F Fiuza, CB Forest, J Foster, C Graziani, J Katz, M Koenig, C-K Li, J Meinecke, R Petrasso, H-S Park, BA Remington, JS Ross, D Ryu, D Ryutov, K Weide, TG White, B Reville, F Miniati, AA Schekochihin, DH Froula, G Gregori, DQ Lamb

Laboratory evidence of dynamo amplification of magnetic fields in a turbulent plasma

(2017)

Authors:

P Tzeferacos, A Rigby, A Bott, AR Bell, R Bingham, A Casner, F Cattaneo, EM Churazov, J Emig, F Fiuza, CB Forest, J Foster, C Graziani, J Katz, M Koenig, C-K Li, J Meinecke, R Petrasso, H-S Park, BA Remington, JS Ross, D Ryu, D Ryutov, TG White, B Reville, F Miniati, AA Schekochihin, DQ Lamb, DH Froula, G Gregori

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