Session RP1 - Poster Session VIII.
POSTER session, Thursday afternoon, October 30
Fran Hill Southeast Exhibit Hall, ACC
First results using the Thomson Scattering (TS) System on HSX have been obtained. Based upon the GA divertor TS system design, the HSX TS system consists of several interdependent subsystems; YAG laser, beam transportation, collection optics, fiber optics, polychromators, and data acquisition. It is capable of providing a 10-point radial profile. The central channel is now operational and the rest of the channels will soon be implemented. HSX is currently using 28GHz ECRH at the second harmonic x-mode for plasma production and heating. It is found that the central electron temperature rises linearly with heating power from 30 KW to 100 KW at a fixed density of 1.5\times 10^12cm^-3; in the QHS mode from 300eV to 700eV, and in the Mirror mode from 200eV-600eV. At 40KW heating power, the electron temperature decreases with increasing plasma density, consistent with the diamagnetic measurement of the stored energy. The operation of the system and the detailed results of density scan and power scan for both QHS and Mirror modes will be presented.