A novel, cost-effective, multi-point Thomson scattering system on the Pegasus Toroidal Experiment (invited)

A novel, cost-effective, multi-point Thomsonscattering system has been designed, implemented, and operated on the Pegasus Toroidal Experiment. Leveraging advances in Nd:YAG lasers, high-efficiency volume phase holographic transmissiongratings, and increased quantum-efficiency Generation 3 image-intensifiedcharge coupled device (ICCD)cameras, the system provides Thomson spectra at eightspatial locations for a single grating/camera pair. The on-board digitization of the ICCDcamera enables easy modular expansion, evidenced by recent extension from 4 to 12 plasma/backgroundspatial location pairs. Stray light is rejected using time-of-flight methods suited to gated ICCDs, and background light is blocked during detector readout by a fast shutter. This ∼103 reduction in background light enables further expansion to up to 24spatial locations. The implementation now provides single-shot Te(R) for ne> 5 × 1018 m−3.

Source: Review of Scientific Instruments - September 16, 2016 Category: Physics Authors: D. J. Schlossberg, G. M. Bodner, M. W. Bongard, R. J. Fonck, J. A. Reusch and C. Rodriguez Sanchez Source Type: research