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- William T. Taitano, Luis Chacón, A. N. Simakov, K. Molvig
- J. Comput. Physics
- 2015

The study and prediction of velocities in the pedestal region of Alcator C-Mod are important for understanding plasma confinement and transport. In this study we examine the simplified neoclassical predictions for impurity flows using equations developed for plasmas with background ions in the Pfirsch-Schlüter (high collisionality) and banana (low… (More)

- William T. Taitano, Luis Chacón, A. N. Simakov
- J. Comput. Physics
- 2016

- P Helander, A N Simakov
- Physical review letters
- 2008

It is shown that collisional plasma transport is intrinsically ambipolar only in quasiaxisymmetric or quasihelically symmetric magnetic configurations. Only in such fields can the plasma rotate freely, and then only in the direction of quasisymmetry. In a non-quasi-symmetric magnetic field, the average radial electric field is determined by parallel… (More)

- L Chacón, Andrei N Simakov, A Zocco
- Physical review letters
- 2007

We formulate a rigorous nonlinear analytical model that describes the dynamics of the diffusion (reconnection) region in driven systems in the context of electron magnetohydrodynamics (EMHD). A steady-state analysis yields allowed geometric configurations and associated reconnection rates. In addition to the well-known open X-point geometry, elongated… (More)

- William T. Taitano, Luis Chacón, A. N. Simakov
- J. Comput. Physics
- 2017

- William T. Taitano, Luis Chacón, Andrei N. Simakov, Brett Keenan
- 2016

Contrary to rad-hydro predictions, the National Ignition Facility has not achieved ignition. Recent experimental evidence suggests that plasma kinetic effects may play an important role during Inertial Confinement Fusion (ICF) capsules’ implosion. Consequently, kinetic models and simulations may be needed to understand better experimental results and design… (More)

The effect of magnetic topology on ion and impurity flows in a tokamak is considered by investigating the consequences of (i) the reversal of toroidal and poloidal magnetic fields and currents, (ii) a switch from lower to upper X-point operation, (iii) poloidal magnetic field or plasma current reversal, and (iv) toroidal magnetic field reversal. The general… (More)

- H Sio, J A Frenje, +19 authors R D Petrasso
- The Review of scientific instruments
- 2016

A Particle X-ray Temporal Diagnostic (PXTD) has been implemented on OMEGA for simultaneous time-resolved measurements of several nuclear products as well as the x-ray continuum produced in High Energy Density Plasmas and Inertial Confinement Fusion implosions. The PXTD removes systematic timing uncertainties typically introduced by using multiple… (More)

- Andrei N Simakov, L Chacón
- Physical review letters
- 2008

Dissipation-independent, or "fast", magnetic reconnection has been observed computationally in Hall magnetohydrodynamics (MHD) and predicted analytically in electron MHD. However, a quantitative analytical theory of reconnection valid for arbitrary ion inertial lengths, d{i}, has been lacking and is proposed here for the first time. The theory describes a… (More)