Supersonic Heat Wave Propagation in Laser-Produced Underdense Plasma for Efficient X-Ray Generation

Conference · Thu Jun 12 00:00:00 EDT 2008

DOI:https://doi.org/10.1088/1742-6596/112/2/022076· OSTI ID:945525

Tanabe, M; Nishimura, H; Fujioka, S; Nagai, K; Iwamae, A; Ohnishi, N; Fournier, K B; Girard, F; Primout, M; Villette, B; Tobin, M; Mima, K

We have observed supersonic heat wave propagation in a low-density aerogel target ({rho} {approx} 3.2 mg/cc) irradiated at the intensity of 4 x 10{sup 14} W/cm{sup 2}. The heat wave propagation was measured with a time-resolved x-ray imaging diagnostics, and the results were compared with simulations made with the two-dimensional radiation-hydrodynamic code, RAICHO. Propagation velocity of the ionization front gradually decreased as the wave propagates into the target. The reason of decrease is due to increase of laser absorption region as the front propagates and interplay of hydrodynamic motion and reflection of laser propagation. These features are well reported with the simulation.

• Research Organization: Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 945525
• Report Number(s): LLNL-CONF-404755; TRN: US0901011
• Resource Relation: Journal Volume: 112; Journal Issue: 2; Conference: Presented at: The Fifth International Conference on Inertial Fusion Sciences and Applications (IFSA2007), Kyoto, Japan, Sep 09 - Sep 14, 2007
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
70 PLASMA PHYSICS AND FUSION
ABSORPTION
HYDRODYNAMICS
IONIZATION
LASERS
PLASMA
REFLECTION
SIMULATION
TARGETS
VELOCITY
WAVE PROPAGATION