The Thomson Scattering Diagnostic for the Material Plasma Exposure eXperiment

Design is complete on the Thomson scattering diagnostic system for the Material Plasma Exposure eXperiment (MPEX), and the procurement and construction of the components are underway. The expected plasma conditions: , , plasma diameter of , and durations of up to make Thomson scattering very challenging on MPEX. Calculations and testing have been performed on several subcomponents of the Thomson scattering system, including the alignment and beam positioning systems as well as the capacity for the system to handle high magnetic fields () and high microwave power () environments. The diagnostic system utilizes two frequency doubled Nd:YAG lasers operating at 532 nm and two spectrometers coupled to high resolution (1024x1024 pixel) intensified CCD cameras. These major component choices were necessary to avoid collective effects and enable measurements at the low temperatures expected within MPEX. Testing and simulation of the various subsystems, including spectrometers, collection optics, beam positioning monitors and controls, laser system, beam dumps, cameras, and the stability of the site will be highlighted. Early installation, calibration, and integrated system testing will also be discussed.