Comment on 'Co-Current rotation of the bullk ions due to the ion orbit loss at the edge of a tokamak plasma'

摘要

In an otherwise good and interesting paper reporting their calculations of the intrinsic rotation due to ion orbit loss Pan et al make several incorrect statements about my previous work in their references. Although they use basically the same methodology in their calculations, there is one important difference, which I surmise is the cause of their incorrect interpretation of my work. While the direction cosine ζ_0 is defined with respect to the toroidal magnetic field direction in all my work, Pan et al have defined ζ_0 with respect to the current, which in both the DⅢ-D shots that I have considered and the EAST shot that they consider are in opposite directions. Thus, in my referenced work 0＜ζ_0 ＜ 1 is counter current and 0 ＞ ζ_0 ＞ -1 is co-current, while for the definition used by Pan et al it is just the opposite. My guess is that Pan et al have interpreted my results with their definition of ζ_0 and essentially gotten everything reversed.