摘要:

In recent years, new concepts for spectroscopic diagnostics in tokamaks have been developed with the emphasis being laid on local measurements. Localization can be achieved by using neutral particle beams or laser beams. While the former are now currently used for spectroscopic purposes, application of the latter is still in an evolutionary stage. One of the most promising concepts using laser beams is Doppler‐free two‐photon excited fluorescence, particularly in the Lyman‐&agr; lines of the hydrogen isotopes H, D and T. A detailed theoretical study has shown that this method should allow local and isotope‐specific measurements of atomic hydrogen groundstate densities; further, in favorable situations, this technique should also permit to measure atomic velocity distributions and macroscopic flows (plasma rotation), as well as the effective ion charge numberZeffand the magnetic field direction. © 1995American Institute of Physics

ISSN:0094-243X    

DOI:10.1063/1.47487

出版商:AIP    

年代:1995

数据来源: AIP

ISSN:0094-243X    

DOI:10.1063/1.47514

出版商:AIP    

年代:1995

数据来源: AIP

ISSN:0094-243X    

DOI:10.1063/1.47459

出版商:AIP    

年代:1995

数据来源: AIP

ISSN:0094-243X    

DOI:10.1063/1.47464

出版商:AIP    

年代:1995

数据来源: AIP

ISSN:0094-243X    

DOI:10.1063/1.47469

出版商:AIP    

年代:1995

数据来源: AIP

摘要:

Some applications of the spectral line shapes theory to astrophysics are briefly reviewed. Among them is the determination of the stellar parameters using hydrogen line profiles, the description of stellar winds in terms of line asymetry, the computation of radiative acceleration for broad lines. Recent theoretical results concerning the line widths of hydrogen lines as also synthetic spectra of hydrogen and ionic radiators are presented. © 1995American Institute of Physics

ISSN:0094-243X    

DOI:10.1063/1.47477

出版商:AIP    

年代:1995

数据来源: AIP

摘要:

Using a low pressure repetitively pulsed discharge in helium‐hydrogen gas mixture, the Stark broadened profiles of He II 320.3 nm, P&bgr;, line was investigated. The electron density ranging between 2.3×1016cm−3and 2.8×1016cm−3was measured with He‐Ne laser interferometer at 3.39 &mgr;m. The intensity ratio of He II P&bgr;and He I 318.8 nm line was employed to determine the electron temperature in the range between 34000 K and 38000 K. At these experimental conditions, the profiles of investigated H II line was recorded and compared with corresponding theoretical line shapes. Our experimental P&bgr;half widths are in agreement with several other experiments and some theoretical calculations. The inclusion of ion‐dynamics in the evaluation of the central part of P&bgr;considerably improves the agreement between the experiment and the theory. © 1995American Institute of Physics

ISSN:0094-243X    

DOI:10.1063/1.47436

出版商:AIP    

年代:1995

数据来源: AIP

ISSN:0094-243X    

DOI:10.1063/1.47437

出版商:AIP    

年代:1995

数据来源: AIP

ISSN:0094-243X    

DOI:10.1063/1.47438

出版商:AIP    

年代:1995

数据来源: AIP

ISSN:0094-243X    

DOI:10.1063/1.47439

出版商:AIP    

年代:1995

数据来源: AIP