• Publications
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The structure of the upper atmosphere of mars: In situ accelerometer measurements from mars global surveyor
Throughout the MGS mission, thermospheric density bulges have been detected on opposite sides of the planet near 90 degreesE and 90 degreesW, in the vicinity of maximum terrain heights, suggesting a wave 2 pattern may be caused by topographically-forced planetary waves propagating up from the lower atmosphere.
Propagation of intense subpicosecond laser pulses through underdense plasmas.
Simulations show that the majority of the reduction in transmission could be due to Raman forward and side scattering, which is accompanied by the generation of anti-Stokes sidebands and up to 2 MeV electrons.
Evolution of self-focusing of intense electromagnetic waves in plasma.
The self-focusing of intense electromagnetic waves in a very underdense plasma is studied in computer simulations and is more intense for resonant double-frequency than for single-frequency illumination.
Ultrahigh-gradient acceleration of injected eletrons by laser-excited relativistic electron plasma waves.
High-gradient acceleration of externally injected 2.1-MeV electrons by a laser beat wave driven relativistic plasma wave has been demonstrated for the first time. Electrons with energies up to the
Relativistic plasma-wave excitation by collinear optical mixing.
The plasma-wave frequency, wave number, spatial extent, and saturation time are directly measured by use of 7-mrad, collective, ruby Thomson scattering and the forward-scattered ir spectrum.
Frequency upconversion of electromagnetic radiation upon transmission into an ionization front.
We have demonstrated that an underdense ionization front can significantly upshift the frequency of an impinging electromagnetic wave. Source radiation at 35 GHz was shifted to more than 116 GHz when
Two-dimensional simulations of single-frequency and beat-wave laser-plasma heating.
Finite-beam, two-dimensional particle simulations of single- and double-frequency laser-plasma heating are presented, showing how a coherent plasma wave heats the electrons to many megaelectronvolts when two collinear laser beams withelta omega.. = ..omega../sub p/ are used.
Strongly coupled stimulated Raman backscatter from subpicosecond laser-plasma interactions.
Strongly coupled stimulated Raman backscatter from the interaction of an intense, subpicosecond laser with an underdense plasma is observed, consistent with the predictions of a strongly coupled Raman theory, appropriately modified for short laser pulses.
Simplest Z' model.
  • He, Joshi, Lew, Volkas
  • Physics
    Physical review. D, Particles and fields
  • 1 October 1991
It is found that these ${Z}^{\ensuremath{'}}$ bosons may have a relatively low mass yet still evade present experimental bounds, while remaining detectable in current accelerators.
Experiments and simulations of tunnel-ionized plasmas.
Two-dimensional simulations indicate that stochastic heating and the Weibelmore instability play an important role in plasma heating in all directions and in making the plasma isotropic and refraction plays a crucial role in determining the maximum electron density that can be obtained in such plasmas.