Multi-energy x-ray detector calibration for T_e and impurity density (n_Z) measurements of MCF plasmas

Journal Article · Wed Sep 07 00:00:00 EDT 2016 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.4960602· OSTI ID:1309457

Maddox, J.  ^[1]; Pablant, N. ^[1]; Efthimion, P. ^[1]; Delgado-Aparicio, L. ^[1]; Hill, K. W. ^[1]; Bitter, M. ^[1]; Reinke, M. L. ^[2]; Rissi, M. ^[3]; Donath, T.  ^[3]; Luethi, B. ^[3]; Stratton, B. ^[1]

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1. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
3. DECTRIS Ltd. (Switzerland)

Here, soft x-ray detection with the new "multi-energy" PILATUS3 detector systems holds promise as a magnetically confined fusion (MCF) plasma diagnostic for ITER and beyond. The measured x-ray brightness can be used to determine impurity concentrations, electron temperatures, n²_eZ_eff products, and to probe the electron energy distribution. However, in order to be effective, these detectors which are really large arrays of detectors with photon energy gating capabilities must be precisely calibrated for each pixel. The energy-dependence of the detector response of the multi-energy PILATUS3 system with 100 K pixels has been measured at Dectris Laboratory. X-rays emitted from a tube under high voltage bombard various elements such that they emit x-ray lines from Zr-Lα to Ag-Kα between 1.8 and 22.16 keV. Each pixel on the PILATUS3 can be set to a minimum energy threshold in the range from 1.6 to 25 keV. This feature allows a single detector to be sensitive to a variety of x-ray energies, so that it is possible to sample the energy distribution of the x-ray continuum and line-emission. PILATUS3 can be configured for 1D or 2D imaging of MCF plasmas with typical spatial energy and temporal resolution of 1 cm, 0.6 keV, and 5 ms, respectively.

• Research Organization: Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
• Sponsoring Organization: USDOE
• Grant/Contract Number: AC02-09CH11466
• OSTI ID: 1309457
• Report Number(s): 5266; RSINAK
• Journal Information: Review of Scientific Instruments, Vol. 87, Issue 11; ISSN 0034-6748
• Publisher: American Institute of Physics (AIP)
• Country of Publication: United States
• Language: English

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