Penetration depths of injected/sputtered tungsten in the plasma edge layer of TEXTOR
Penetration depths of injected/sputtered tungsten in the plasma edge layer of TEXTOR
To quantify tungsten (W) sputtering measurements by spectroscopy, two experiments have been carried out in the tokamak TEXTOR. The erosion of a W limiter in the plasma edge was studied spectrocopically under different plasma conditions. Conversion of the photon fluxes of neutral W lines was performe...
Saved in:
Personal Name(s): | Laengner, M. (Corresponding author) |
---|---|
Brezinsek, S. / Coenen, J. W. / Pospieszczyk, A. / Kondratyev, D. / Borodin, D. / Stoschus, H. / Schmitz, O. / Philipps, V. / Samm, U. | |
Contributing Institute: |
Plasmaphysik; IEK-4 |
Published in: | Journal of nuclear materials, 438 (2013) S. S865 - S870 |
Imprint: |
Amsterdam [u.a.]
Elsevier Science
2013
|
DOI: |
10.1016/j.jnucmat.2013.01.187 |
Document Type: |
Journal Article |
Research Program: |
Plasma-Wall-Interaction |
Publikationsportal JuSER |
To quantify tungsten (W) sputtering measurements by spectroscopy, two experiments have been carried out in the tokamak TEXTOR. The erosion of a W limiter in the plasma edge was studied spectrocopically under different plasma conditions. Conversion of the photon fluxes of neutral W lines was performed [1] with the aid of inverse photon efficiencies, measured in situ in a second experiment with WF6 injection to realise a controllable W source. Penetration depths, particle velocities and line ratios of W I were determined and compared between the two sources of W. The velocities of injected and sputtered W differ by a factor of 3 as the analysis of the penetration depth shows, while the line ratios for different W I lines are comparable. A comparison of the e-folding length with the model code GKU was performed which reveals a deviation of at least a factor of 6. Inverse photon efficiencies at Te = 40 eV were determined to be about 44 for W I (400.88 nm) and about 63 for W I (429.46 nm). |