First charge exchange recombination spectroscopy and motional Stark effectresults from the Madison Symmetric Torus reversed field pinch

We report on the first results of charge exchange recombination spectroscop y (CHERS) and motional Stark effect (MSE) measurements in the Madison Symme tric Torus reversed field pinch. A 30 keV, 4 A neutral H beam is used in co mbination with visible and ultraviolet spectroscopy to make the measurement s. For CHERS, we find that the C VI line at 3433.69 Angstrom yields the lar gest charge-exchange signal/background ratio and is most clearly resolved f rom other nearby lines. Equilibrium ion temperature measurements have been made with an existing fast Doppler spectrometer and a higher throughput spe ctrometer is being designed to do velocity and temperature fluctuation meas urements. MSE measurements are made by recording the Doppler shifted H-alph a spectrum emitted by the beam with a charge coupled device and imaging spe ctrometer. We have observed separation of the pi components of the Stark ma nifold at magnetic fields of about 0.5 T and are considering options for in creasing measurement accuracy. (C) 2001 American Institute of Physics.