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

fYear

1999

fDate

1999

Firstpage

349

Lastpage

351

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Fusion Engineering, 1999. 18th Symposium on

Conference_Location

Albuquerque, NM

Print_ISBN

0-7803-5829-5

Type

conf

DOI

10.1109/FUSION.1999.849854

Filename

849854