CORRIGENDUM: Bootstrap current and parallel ion velocity in imperfectly optimized stellarators

Our recent paper (Journal of Plasma Physics (2020) 86:1 (905860105) DOI: 10.1017/S002237781900093X) presents a careful and rather general evaluation of the parallel ion flow and parallel current in an imperfectly optimized stellarator. As the disagreement between our and earlier analytical results (Shaing et al. 1989; Helander, Geiger & Maaßberg 2011; Landreman & Catto 2012; Helander, Parra & Newton 2017) and simulations (Beidler et al. 2011; Kernbichler et al. 2016) remains, we speculated on a possible cause of some of the disagreement. However, this explanation in § 8 of how a specious current might arise when an approximate form of the tangential drift is employed in simulations is flawed. Dr C. Beidler has observed that our speculation is invalid as stellarator symmetry causes the spurious terms to vanish. Stellarator symmetry requires the magnitude of the magnetic field of a stellarator to be exactly the same when it is turned over. Consequently, our paper needs to be modified. See original paper: PSFC/JA-19-23 See: https://library.psfc.mit.edu/catalog/reports/2010/19ja/19ja023/abstract.php