First analysis of the misaligned leading edges of ITER-like Plasma Facing Units using a very high resolution infrared camera in WEST - Aix-Marseille Université Access content directly
Journal Articles Nuclear Fusion Year : 2020

First analysis of the misaligned leading edges of ITER-like Plasma Facing Units using a very high resolution infrared camera in WEST

G de Temmerman
  • Function : Author
A Durocher
  • Function : Author
F Escourbiac
  • Function : Author
R A Pitts
  • Function : Author

Abstract

Twelve ITER-like plasma-facing units made of tungsten were exposed in the WEST tokamak divertor, with three PFUs significantly overexposed to plasma heat flux: one sharp-edged PFU (vertical misalignment h = 0.8 mm) and two chamfered PFUs (h = 0.6 mm and 0.3 mm, respectively). This paper describes the first temperature analysis obtained with a very high spatial resolution infrared camera (pixel size ~ 0.1 mm) on the misaligned PFU edges and shows the consistency obtained on the parallel heat flux derived from these measurements. The analysis is focused on the hottest areas of the PFU misaligned leading edges, since the temperature detection threshold of the VHR camera is high (Tthreshold,BB ≈ 370°C). The heat flux parallel to the magnetic field lines is assessed by matching the toroidal temperature profile in the vicinity of the leading edge with 3D finite element modelling. The tungsten emissivity assumed in this study is 0.6, consistent with laboratory measurements for damaged PFUs. For the three PFUs studied (with different vertical misalignments, incident angles, geometries), the derived parallel heat flux is similar, and consistent with independent measurements by a Fiber Bragg grating embedded in a graphite PFU at another toroidal location, giving confidence in future experiments using the same settings.
Fichier principal
Vignette du fichier
Misaligned_LE_AG_final.pdf (2.16 Mo) Télécharger le fichier
Origin : Files produced by the author(s)

Dates and versions

hal-03148253 , version 1 (22-02-2021)

Identifiers

  • HAL Id : hal-03148253 , version 1

Cite

A Grosjean, Y Corre, R Dejarnac, J Gaspar, J P Gunn, et al.. First analysis of the misaligned leading edges of ITER-like Plasma Facing Units using a very high resolution infrared camera in WEST. Nuclear Fusion, 2020. ⟨hal-03148253⟩
89 View
76 Download

Share

Gmail Facebook X LinkedIn More