Intensity measurements of the forbidden line 975 Å of Fe xviii: A transition sensitive to proton temperature
Abstract
The intensity of the Fe xviii forbidden line at 975 Å (2s22p5 2P1/2-->2s22p5 2P3/2) relative to that of an allowed line at 94 Å (2s2p6 2S1/2-->2s22p5 2P3/2) was measured during ion-Bernstein-wave heating in tokamak discharges. The results at low electron densities (ne<3×1013 cm-3) indicated a noticeable effect of proton collisions on the intensity of the forbidden line. Calculation also shows the importance of proton collision to the Fe xviii forbidden-line intensity.
- Publication:
-
Physical Review Letters
- Pub Date:
- January 1986
- DOI:
- 10.1103/PhysRevLett.56.151
- Bibcode:
- 1986PhRvL..56..151S
- Keywords:
-
- Forbidden Transitions;
- Iron;
- Metallic Plasmas;
- Plasma Spectra;
- Proton Energy;
- Atomic Energy Levels;
- Electron Energy;
- Ion Temperature;
- Line Spectra;
- Temporal Distribution;
- Plasma Physics;
- 52.20.Hv;
- 32.30.Rj;
- 52.25.Nr;
- Atomic molecular ion and heavy-particle collisions;
- X-ray spectra