Schematic of the MST magnetic geometry. Spectroscopic measurements reported in this paper are made at the edge of the plasma, viewing vertically at an impact parameter of r/a ∼0.92, predominantly parallel to the magnetic field lines.
Measured time evolution of C +4 temperature (predominantly parallel to equilibrium magnetic field) during magnetic reconnection.
Increase in temperature of various ion species versus their charge-to-mass ratio.
Power spectra, at (solid line) and away from (dotted line) the reconnection event, of magnetic fluctuations ( ) measured using magnetic pickup coil at the edge of the plasma.
(a) Normalized version of the main ion temperature evolution during reconnection event measured using Rutherford scattering diagnostic. (b) Ad-hoc perpendicular heating term used in the model for C +4 ion. (c) Modeled time evolution of perpendicular (solid line) and parallel (dashed line) C +4 ion temperatures.
Change in ion temperature in parallel (a) and perpendicular (b)directions for a perpendicular heating consistent with the ion cyclotron model.
Change in ion temperature in parallel (a) and perpendicular (b)directions for a constant perpendicular heating of 3 eV/μs for all ions.
Variation of the angle (θ) between the magnetic field and the viewing chord.
At a point along the chord, sight line makes an angle θ with .
(a) Model predicted perpendicular (solid) and parallel (dotted) temperatures. (b) Chord averaged parallel (solid) and mixed (dotted) temperatures.
Impurity ion species, atomic transition wavelengths and their charge-to-mass ratio ( , where Z is the ionic charge and μ is the ratio of the ion mass to the proton mass.).
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