Title :
Optical and mechanical design of C-Mod motional Stark effect diagnostic
Author :
Simon, D.I. ; Bretz, N.L. ; Marmar, E. ; Bravenec, R. ; Parsells, R.F.
Author_Institution :
Plasma Phys. Lab., Princeton Univ., NJ, USA
Abstract :
A motional Stark effect (MSE) instrument is being installed on the Alcator C-Mod tokamak at MIT. This MSE diagnostic will provide measurements of the spatial profile of the internal poloidal magnetic field. The MSE has its primary collection optics inside the vacuum vessel. The light collected by the internal optics passes through a vacuum window and is relayed to a fiber optic array. The MSE optics are shared by a beam emission spectroscopy (BES) diagnostic which measures electron density fluctuations and their spatial correlations. This optical system requires high throughput and spatial resolution of less than 1 cm at the focal plane in the plasma. The design requirements for the internal optics also include the effects associated with plasma impingement, plasma disruptions, and thermal excursions
Keywords :
Stark effect; fusion reactor design; fusion reactor instrumentation; plasma density; plasma diagnostics; plasma fluctuations; plasma instability; plasma toroidal confinement; Alcator C-Mod tokamak; beam emission spectroscopy; electron density fluctuations; fiber optic array; fusion reactors; internal poloidal magnetic field; mechanical design; motional Stark effect diagnostic; optical design; plasma disruptions; plasma impingement; primary collection optics; spatial profile; thermal excursions; vacuum window; Electron optics; Instruments; Magnetic field measurement; Optical arrays; Optical design; Plasma density; Plasma diagnostics; Plasma measurements; Stark effect; Stimulated emission;
Conference_Titel :
Fusion Engineering, 1999. 18th Symposium on
Conference_Location :
Albuquerque, NM
Print_ISBN :
0-7803-5829-5
DOI :
10.1109/FUSION.1999.849854
