Narrow-band, near-UV, high-repetition-rate laser-induced fluorescence system for use as an dge diagnostic in fusion machine
Abstract
A laser system for impurity diagnostics in the edge region of fusion devices is described. A single mode CW dye laser with scan capability of 30 GHz in 100 msec is amplified by 3 fast flow dye cells, pumped by a high repetition rate excimer laser. Average power during the 8 ns pulses of about 0.8 MW for amplified narrowband output at 604 rm, and 80 kW after frequency doubling in KD*P was achieved, with spectral bandwidth in the tenths of GHz regime. The usefulness of such high resolution is demonstrated by a model calculation for Fe velocity spectra involving the presence of thermal and sputtered flux, and spatial averaging. Laboratory velocity spectra are presented for Fe atoms, sputtered in the a(5) D4 ground state.
- Publication:
-
Presented at the 9th Intern. Vacuum Congr. and 5th Intern. Conf. on Solid Surfaces
- Pub Date:
- July 1983
- Bibcode:
- 1983icss.conf.....Y
- Keywords:
-
- Dye Lasers;
- Fluorescence;
- Impurities;
- Laser Induced Fluorescence;
- Laser Outputs;
- Tokamak Devices;
- Plasma Diagnostics;
- Thermonuclear Power Generation;
- Lasers and Masers