Novel Multi-Energy Soft X-Ray Camera in the WEST Tokamak: First Data and Synthetic Diagnostic
POSTER
Abstract
During the C6 campaign, the tungsten (W) Environment in Steady-state Tokamak (WEST)
tokamak will operate for the 1st time with a water-cooled full tungsten divertor -similar to that of
ITER- and long-pulse scenarios, making it an ideal environment for high-Z impurity transport
studies. In that context, a compact multi-energy ( 2-30 keV) soft x-ray diagnostic (MESXR)
was deployed by PPPL in WEST for high-Z impurity transport studies and electron
temperature profile measurements. The ME-SXR consists of the PILATUS3 photon-counting
detector manufactured by DECTRIS Ltd. mounted on a pinhole camera with a temporal and
spatial resolution of 2 ms and 1-2 cm, respectively. The novelty of this soft x-ray diagnostic lies
in the fact that the lower-energy threshold is set independently on each one of the 100k pixels
with a high energy resolution (< 1 keV). The design, capabilities and engineering challenges of
the ME-SXR diagnostic are briefly presented here.
This contribution mainly presents the first data of the ME-SXR diagnostic acquired during
C6. A tentative comparison of the experimental x-ray emissivity with predictions made using
the synthetic diagnostic based on the FLYCHK suite for the computation of the charge-state
distribution and x-ray emissivity of the plasmas as well as the ToFu open-source python
library will also be presented.
tokamak will operate for the 1st time with a water-cooled full tungsten divertor -similar to that of
ITER- and long-pulse scenarios, making it an ideal environment for high-Z impurity transport
studies. In that context, a compact multi-energy ( 2-30 keV) soft x-ray diagnostic (MESXR)
was deployed by PPPL in WEST for high-Z impurity transport studies and electron
temperature profile measurements. The ME-SXR consists of the PILATUS3 photon-counting
detector manufactured by DECTRIS Ltd. mounted on a pinhole camera with a temporal and
spatial resolution of 2 ms and 1-2 cm, respectively. The novelty of this soft x-ray diagnostic lies
in the fact that the lower-energy threshold is set independently on each one of the 100k pixels
with a high energy resolution (< 1 keV). The design, capabilities and engineering challenges of
the ME-SXR diagnostic are briefly presented here.
This contribution mainly presents the first data of the ME-SXR diagnostic acquired during
C6. A tentative comparison of the experimental x-ray emissivity with predictions made using
the synthetic diagnostic based on the FLYCHK suite for the computation of the charge-state
distribution and x-ray emissivity of the plasmas as well as the ToFu open-source python
library will also be presented.
*This work is supported by the U.S. DOE-OFES under Contract No. DE-AC02-09CH11466.
Presenters
-
Oulfa Chellai
- Princeton Plasma Physics Laboratory