HEDLP FESAC Subpanel Workshop August, 2008 Nevada Terawatt Facility, University of Nevada Reno Joseph M. Kindel Nevada Terawatt Facility College of Science University of Nevada, Reno

Outline Issues for HEDLP Subpanel Nevada Terawatt Facility HEDLP Science at the Nevada Terawatt Facility (NTF) Conclusions Nevada Terawatt Facility College of Science University of Nevada, Reno

Some HEDLP Issues: Small Facilities such as The Nevada Terawatt Facility impact several HEDLP focus areas -As a Staging Facility for the Testing of Novel Physics Ideas and New Diagnostics -Fusion especially in Pinches -Fast Ignition e.g. absorption and transport -The Evolution of Compressible Nonlinear Flows into Turbulence -Plasmas with Embedded Magnetic Fields -The Underlying Physics of High-β Plasmas - Experimental Testbed for Validation of Complex Codes Nevada Terawatt Facility College of Science University of Nevada, Reno

Facilities Zebra2TW, 100ns pulsed power z pinch Leopard50TW, 350fs short pulse laser Cheetah10TW, 30fs, 10Hz short pulse laser Computer Cluster86 nodes 18.6 TBytes Nevada Terawatt Facility College of Science University of Nevada, Reno

Nevada Terawatt Facility College of Science University of Nevada, Reno 2007:390 shots on Zebra

Nevada Terawatt Facility College of Science University of Nevada, Reno Science at the Nevada Terawatt Facility Wire array experiments Planar arrays The mystery of enhanced x-ray emission Flute instability and its possible role in changing energy composition Star-like wire arrays Laser z-pinch experiments Magnetized isochoric heating to create extreme conditions of matter Astrophysical jet formation Material research

Nevada Terawatt Facility College of Science University of Nevada, Reno Nested quadruple array V. Ivanov Planar array V. Kantsyrev

B o  (r) r z jzjz Current in the wire array ~ 1 MA Plasma parameters in a precursor plasma Precursor Wires n oe = 2.0x10 19 cm -3, n oi = 2.0x10 18 cm -3, T i ~T e = 100eV, B o = 0.3MG  =0.55  cAl = 1.1x10 10 s -1  pAl = 1.4x10 13 s -1 Nevada Terawatt Facility College of Science University of Nevada, Reno

Numerical results Density in linear stage Density in nonlinear stage Nevada Terawatt Facility College of Science University of Nevada, Reno

Formation of zonal flow on the nonlinear stage 2D density spectrum at the linear stage 2D density spectrum at the late nonlinear stage 2D density spectrum at the early nonlinear stage kyky kxkx kxkx kyky kyky kxkx

Spectral cascade to short scales Evolution of the density spectrum (k x ) in time kxkx kxkx Evolution of the potential spectrum (k x ) in time

Instability of flute modes in a precursor z-pinch plasma can explain experimentally observed properties of excited perturbations Characteristic wavelengths of excited waves ~ mm Typical rise time of excited waves ~ 20 ns Development of large scale cells on nonlinear stage Wave spectrum cascading towards short scales b 2 mm a Axis Sotnikov, Ivanov et al., IEEE TPS, 2005; Sotnikov, Ivanov et al., CiCP 2008, to be published Nevada Terawatt Facility College of Science University of Nevada, Reno

Leopard laser parameters: E L ≤ 15 J t FWHM ≈ 350 fs Ф ≥ 50 µm Leopard Zebra experiment: collimated plasma flow across a magnetic field Nevada Terawatt Facility College of Science University of Nevada, Reno R. Presura BөBө I = 1 MA Plasma 60 T Laser

Summary Mature Z-Pinch Facility Ready to Become a User Facility One Micron Sub-Picosecond 50 TW Laser being Coupled to 2 TW Z-Pinch Small Facilities such as NTF Impact Several HEDLP Focus Areas - As a Staging Facility for the Testing of Novel Physics Ideas and New Diagnostics -Fusion Especially in Pinches -Fast Ignition e.g. absorption and transport - Evolution of Compressible Nonlinear Flows into Turbulence - Plasmas with Embedded Magnetic Fields - Study of Underlying Physics in High-β Plasmas - Experimental Testbed for Validation of Complex Codes Nevada Terawatt Facility College of Science University of Nevada, Reno