Main ion toroidal rotation in the edge of the Alcator C-Mod tokamak

The main ion toroidal rotation and temperature is measured spectroscopically at the inner wall midplane plasma edge $\pm$1 cm around the last closed flux surface. A four channel high resolution transmission grating spectrometer monitors the Doppler shift and width of the deuterium Balmer beta emission line shape at 4860 {\AA}, every 8 ms for the duration of the discharge. The measurement is localized using a radially oriented neutral deuterium gas puff which enhances the emission via charge exchange with the fuel ions. Comparisons with impurity rotation and temperature from B V deduced in a similar fashion will be given under various plasma conditions. Also, a proof of principle measurement of helium rotation and temperature in an L-mode helium majority plasma has been accomplished by monitoring the diagnostic neutral beam induced charge exchange enhancement of the Paschen $\alpha$ transition in He II at 4686 {\AA}. This work was performed under the auspices of the U. S. Department of Energy by the Lawrence Livermore National Laboratory under contract DE-AC52-07NA27344.