53 citations · 423 across the 31 of their papers we have counts for
30 papers
Fusion-power amplification by compressive hydrodynamic fluctuations
Henry Fetsch, Nathaniel J. Fisch
Compressive fluctuations in hot plasma, including acoustic waves and compressible turbulence, increase the rate of fusion reactions. This power amplification comprises hydrodynamic…
Long-Pulse Fast Ignition in MagLIF
Benjamin Wang, Henry Fetsch, Nathaniel J. Fisch
The fast ignition paradigm for inertial confinement fusion (ICF) allows for extremely high gains but requires fuel to be heated very quickly to outpace hotspot disassembly and ener…
An ignition criterion for inertial fusion boosted by microturbulence
Henry Fetsch, Nathaniel J. Fisch
Turbulence enhances fusion reactivity, enabling ignition at lower temperature. A modified Lawson-like ignition criterion is derived for inertially confined plasmas harboring turbul…
Analytical models for the enhancement of fusion reactivity by turbulence
Henry Fetsch, Nathaniel J. Fisch
The reactivity of fusion plasma depends not only on its local density and temperature but also, through a recently identified kinetic effect, on the relative velocities of nearby f…
Image rotation in plasmas
Renaud Gueroult, Shreekrishna K. Tripathi, Jia Han +3
Because of the speed of light compared to material motion, the dragging of light is difficult to observe under laboratory conditions. Here we report on the first observation of ima…
Amplification of turbulence through multiple planar shocks
Michael F. Zhang, Seth Davidovits, Nathaniel J. Fisch
We study the amplification of isotropic, incompressible turbulence through multiple planar, collisional shocks, using analytical linear theory. There are two limiting cases we expl…
Enhancement to Fusion Reactivity in Sheared Flows
Henry Fetsch, Nathaniel J. Fisch
Sheared flow increases the reactivity of fusion plasma. In unmagnetized plasma with flow gradients comparable to the mean free path of reacting ions, fusion reactivity can be more…
Evolution of the Radiative Thermal Instability in a Confined Medium
Henry Fetsch, Nathaniel J. Fisch
Thermally bistable fluid tends to self-organize into clouds of hot and cold material, which are internally uniform and separated by thin conduction fronts. The evolution of these c…
Lowering the reactor breakeven requirements for proton-Boron 11 fusion
Ian E. Ochs, Nathaniel J. Fisch
Recently, it has been shown that altering the natural collisional power flow of the proton-Boron 11 (pB11) fusion reaction can significantly reduce the Lawson product of ion densit…
Massive, Long-Lived Electrostatic Potentials in a Rotating Mirror Plasma
E. J. Kolmes, I. E. Ochs, J. -M. Rax +1
Hot plasma is highly conductive in the direction parallel to a magnetic field. This often means that the electrical potential will be nearly constant along any given field line. Wh…
Heat Pump via Charge Incompressibility in a Collisional Magnetized Multi-Ion Plasma
M. E. Mlodik, E. J. Kolmes, I. E. Ochs +1
Stratification due to ion-ion friction in a magnetized multiple-ion species plasma is shown to be accompanied by a heat pump effect, identified for the first time here, transferrin…
Pulsed RF Schemes for Tearing Mode Stabilization
Suying Jin, Nathaniel J. Fisch, Allan H. Reiman
The RF stabilization of tearing modes with current condensation has the potential to increase stabilization efficiency and loosen power localization requirements. Such benefits ste…
RF current condensation in the presence of turbulent enhanced transport
Eduardo Rodriguez, Allan H. Reiman, Nathaniel J. Fisch
Sharp temperature gradients in a magnetically confined plasma can lead to turbulent motion of the plasma. This turbulence in turn enhances the transport of heat across magnetic fie…
Maximum-Entropy States for Magnetized Ion Transport
E. J. Kolmes, I. E. Ochs, M. E. Mlodik +1
For a plasma with fixed total energy, number of particles, and momentum, the distribution function that maximizes entropy is a Boltzmann distribution. If, in addition, the rearrang…
ExB flows for high-throughput plasma mass separation
R. Gueroult, S. J. Zweben, N. J. Fisch +1
High-throughput plasma separation based on atomic mass holds the promise for offering unique solutions to a variety of high-impact societal applications. Through the mass different…
Suppression of Tearing Modes by RF Current Condensation
A. H. Reiman, N. J. Fisch
Currents driven by rf (radio frequency) waves in the interior of magnetic islands can stabilize deleterious tearing modes in tokamaks. Present analyses of stabilization assume that…
Strategies for Advantageous Differential Transport of Ions in Magnetic Fusion Devices
E. J. Kolmes, I. E. Ochs, N. J. Fisch
In a variety of magnetized plasma geometries, it has long been known that highly charged impurities tend to accumulate in regions of higher density. Here, we examine how this "coll…
Verification of nonlinear particle simulation of radio frequency waves in tokamak
A. Kuley, Z. Lin, J. Bao +5
Nonlinear simulation model for radio frequency (RF) waves in fusion plasmas has been developed and verified using fully kinetic ion and drift kinetic electron. Ion cyclotron motion…
Kinetic simulations of ladder climbing by electron plasma waves
Kentaro Hara, Ido Barth, Erez Kaminski +2
The energy of plasma waves can be moved up and down the spectrum using chirped modulations of plasma parameters, which can be driven by external fields. Depending on whether the wa…
Efficiency of Wave-Driven Rigid Body Rotation Toroidal Confinement
J. -M. Rax, R. Gueroult, N. J. Fisch
The compensation of vertical drifts in toroidal magnetic fields through a wave-driven poloidal rotation is compared to compensation through the wave driven toroidal current generat…
Ladder Climbing and Autoresonant Acceleration of Plasma Waves
Ido Barth, Ilya Y. Dodin, Nathaniel J. Fisch
When the background density in a bounded plasma is modulated in time, discrete modes become coupled. Interestingly, for appropriately chosen modulations, the average plasmon energy…
Saturation of the leading spike growth in backward Raman amplifiers
V. M. Malkin, Z. Toroker, N. J. Fisch
Backward Raman amplification of laser pulses in plasmas can produce nearly relativistic unfocused output intensities and multi-exawatt powers in compact devices. The largest achiev…
Backward Raman amplification in the Langmuir wavebreaking regime
Z. Toroker, V. M. Malkin, N. J. Fisch
In plasma-based backward Raman amplifiers, the output pulse intensity increases with the input pump pulse intensity, as long as the Langmuir wave mediating energy transfer from the…
Are perytons signatures of ball lightning?
I. Y. Dodin, N. J. Fisch
The enigmatic downchirped signals, called "perytons", that are detected by radio telescopes in the GHz frequency range may be produced by an atmospheric phenomenon known as ball li…