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perimental demonstration of early time, hohlraum
radiation symmetry tuning for indirect drive ignition
experiments
E. L. Dewald, J. Milovich, C. Thomas, J. Kline, C. Sorce,
S. Glenn, and O. L. Landen
Early time radiation symmetry for indirect drive
ignition on the NIF will be tuned using re-emission
spheres. The technique was validated on the Omega laser
facility using 0.9 ignition-scale vacuum hohlraums at
radiation temperatures similar to the first 2 ns of the
ignition drive. Our simple analytical model is in good
agreement with both measured P2/P0 and P4/P0 and their
dependence on inner beam power fraction for reasonable
assumptions made on the hohlraum albedo and inner vs
outer beam couplings into x-rays.
Phys. Plasmas 18, 092703 (2011)
PoP 18, 092302
Effect of driving frequency on excitation of turbulence
in a kinetic plasma
T. N. Parashar, S. Servidio, M. A. Shay, B. Breech, and
W. H. Matthaeus
The effect of driving frequency on the efficiency of
turbulence generation through magnetic forcing is
studied using kinetic hybrid simulations with fully
kinetic ions and fluid electrons. The efficiency of
driving is quantified by examining the energy input into
magnetic field as well as the thermal energy for various
driving frequencies.
Phys. Plasmas 18, 092302 (2011)
PHP083103RH
Group velocity and pulse lengthening of mismatched laser
pulses in plasma channels
C. B. Schroeder, C. Benedetti, E. Esarey, J. van Tilborg,
and W. P. Leemans
Analytic solutions are presented to the non-paraxial
wave equation describing an ultra-short, low-power,
laser pulse propagating in a plasma channel.
Implications for plasma channel diagnostics are
discussed.
Phys. Plasmas 18, 083103 (2011)
PHP080705RH
Full wave effects on the lower hybrid wave spectrum and
driven current profile in tokamak plasmas
S. Shiraiwa, J. Ko, O. Meneghini, R. Parker, A. E.
Schmidt, S. Scott, M. Greenwald, A. E. Hubbard, J.
Hughes, Y. Ma, Y. Podpaly, J. E. Rice, G. Wallace, J. R.
Wilson, S. M. Wolfe, and Alcator C-Mod Group
This is the first demonstration of lower hybrid current
drive (LHCD) current profile modeling using a full wave
simulation code in a multi-pass absorption regime,
showing the clear impact of full wave effects on the
LHCD driven current profile.
Phys. Plasmas 18, 080705 (2011)
pop055501rh
The many faces of shear Alfvén waves
W. Gekelman, S. Vincena, B. Van Compernolle, G. J.
Morales, J. E. Maggs, P. Pribyl, and T. A. Carter
Alfvén waves are of fundamental importance in space
plasmas, astrophysical plasmas, and in earthbound
efforts to achieve thermonuclear fusion in confined
magnetized plasmas. In this review, the authors present
an overview of the major results from past experiments
and provide a modern prospective for the earlier studies
of shear Alfvén waves.
Phys. Plasmas 18, 055501 (2011)
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