Publications associated with High Energy Density Physics and Inertial Fusion Energy

Progress in long scale length laser-plasma interactions

Nuclear Fusion 44 (2004) S185-S190

SH Glenzer, PA Arnold, GW Bardsley, RL Berger, G Bonanno, T Borger, DE Bower, MW Bowers, RB Bryant, SJ Buckman, SC Burkhart, KM Campbell, MP Chrisp, BI Cohen, C Constantin, F Cooper, JR Cox, EL Dewald, LM Divol, SN Dixit, JJ Duncan, DC Eder, JM Edwards, GV Erbert, B Felker, JA Fornés, G Frieders, DH Froula, SD Gardner, C Gates, MJ Gonzalez, SE Grace, G Gregori, AL Greenwood, RL Griffith, TA Hall, BA Hammel, CA Haynam, GM Heestand, MA Henesian, GL Hermes, DE Hinkel, JP Holder, F Holdner, GM Holtmeier, WW Hsing, SR Huber, TM James, SC Johnson, OS Jones, DH Kalantar, JH Kamperschroer, RL Kauffman, TM Kelleher, JB Knight, RK Kirkwood, WL Kruer, W Labiak, OL Landen, AB Langdon, SH Langer, DA Latray, AP Lee, FD Lee, D Lund, BJ Macgowan, SR Marshall, JA McBride, TJ McCarville, L McGrew, AJ Mackinnon, S Mahavandi, KR Manes, CD Marshall, JA Menapace, EP Mertens, NB Meezan, GH Miller, S Montelongo, JD Moody, EI Moses, DH Munro, JR Murray, JD Neumann, MA Newton, E Ng, C Niemann, AJ Nikitin, P Opsahl, EH Padilla, TG Parham, GL Parrish, CS Petty, M Polk, CL Powell, IP Reinbachs, VV Rekow, RJ Rinnert, BP Riordan, MA Rhodes, V Roberts, HF Robey, GF Ross, SF Sailors, RL Saunders, MJ Schmitt, MB Schneider, SJ Shiromizu, ML Spaeth, AL Stephens, BA Still, LJ Suter, GL Tietbohl, MT Tobin, JM Tuck, BM Van Wonterghem, RA Vidal, DG Voloshin, RJ Wallace, PJ Wegner, PK Whitman, EA Williams, KA Williams, K Winward, K Work, B Young, PE Young, PG Zapata, RE Bahr, WD Seka, JC Fernández, DS Montgomery, HA Rosé

The first experiments on the National Ignition Facility (NIF) have employed the first four beams to measure propagation and laser backscattering losses in large ignition-size plasmas. Gas-filled targets between 2 and 7 mm length have been heated from one side by overlapping the focal spots of the four beams from one quad operated at 351 nm (3ω) with a total intensity of 2 × 1015 Wcm-2. The targets were filled with 1 atm of CO 2 producing up to 7 mm long homogeneously heated plasmas with densities of ne = 6 × 1020 cm-3 and temperatures of Te = 2 keV. The high energy in an NIF quad of beams of 16 kJ, illuminating the target from one direction, creates unique conditions for the study of laser-plasma interactions at scale lengths not previously accessible. The propagation through the large-scale plasma was measured with a gated x-ray imager that was filtered for 3.5 keV x-rays. These data indicate that the beams interact with the full length of this ignition-scale plasma during the last ∼1 ns of the experiment. During that time, the full aperture measurements of the stimulated Brillouin scattering and stimulated Raman scattering show scattering into the four focusing lenses of 3% for the smallest length (∼2 mm), increasing to 10-12% for ∼7mm. These results demonstrate the NIF experimental capabilities and further provide a benchmark for three-dimensional modelling of the laser-plasma interactions at ignition-size scale lengths.

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