Comment on "A neoclassical calculation of rotation profiles and comparison with DIII-D measurements"

TL;DR

This paper critiques a previous neoclassical calculation of plasma rotation profiles, identifying errors and proposing an alternative formulation to improve accuracy in modeling tokamak plasma behavior.

Contribution

It highlights errors in prior work and offers a corrected, more physically consistent approach to calculating plasma rotation profiles in tokamaks.

Findings

Identified errors in the original calculation

Proposed an alternative, corrected formulation

Improved understanding of plasma rotation modeling

Abstract

The calculation presented in "A neoclassical calculation of rotation profiles and comparison with DIII-D measurements" by Stacey, Johnson, and Mandrekas, [Physics of Plasmas, 13, (2006)], contains several errors, including the neglect of the toroidal electric field, an unphysical expression for the electrostatic potential, and an unevaluated relation among its parameters. An alternative formulation is discussed.