EXPERIMENTAL-STUDY OF CONVENTIONAL AND MULTIPASS THOMSON SCATTERING DIAGNOSTIC SYSTEMS

A low-cost, simple and effective multipass structure was built and tes ted for the first time in a theta-pinch device; the compact torus TC-1 . A detailed analysis of the gain in the scattered signal produced by the multipass system is presented. The use of a multipass geometry for Thomson scattering experiments in theta-pinch devices or in more dens e plasmas as well as in plasmas with higher Z(eff) is recommended for increasing the relationship between scattered and bremsstrahlung signa ls.