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In situ monitoring hydrogen isotope retention in ITER first wall
- Source :
- Nuclear Fusion. 56:036017
- Publication Year :
- 2016
- Publisher :
- IOP Publishing, 2016.
-
Abstract
- Tritium retention inside the vacuum vessel is a potentially serious constraint in the operation of large-scale fusion machines like ITER. An in situ diagnostics for first wall H/D/T retention by laser induced desorption spectroscopy (LIDS) is proposed for use between plasma discharges. The technique is based on local baking of the first wall by laser irradiation and subsequent analysis of the in-vessel gas by optical emission spectroscopy of plasma radiation. The local heating implementation, kinetics of H/D/T thermal extraction and the accuracy of optical emission spectroscopy measurements are analysed. To resolve the H/D/T lines spectroscopically, their thermal broadening should be minimized to prevent overlapping of the line shapes. A comparative performance analysis of several types of plasma sources with relatively cold ions is made including the following types of discharges: Penning, RF multipactor, laser torch and ECR. All these radiation sources require rather low power and could be used for remote in situ measurements of relative densities of the thermally extracted hydrogen isotopes.
- Subjects :
- Nuclear and High Energy Physics
Materials science
Hydrogen
chemistry.chemical_element
Plasma
Radiation
Condensed Matter Physics
Laser
01 natural sciences
010305 fluids & plasmas
law.invention
Ion
chemistry
law
0103 physical sciences
Thermal
Irradiation
Atomic physics
010306 general physics
Spectroscopy
Subjects
Details
- ISSN :
- 17414326 and 00295515
- Volume :
- 56
- Database :
- OpenAIRE
- Journal :
- Nuclear Fusion
- Accession number :
- edsair.doi...........dc023e65282ea87a1da52a5f2bba943c