Multi-energy x-ray detector calibration for Te and impurity density (nZ) measurements of MCF plasmas
Authors: J. Maddox, N. Pablant, P. Efthimion, L.
Delgado-Aparicio, K.W. Hill, M. Bitter, M.L. Reinke, M. Rissi,T.
Donath, B. Luethi, B. Stratton
Abstract: Soft x-ray detection with the new "multi-energy"
PILATUS3 detector systems holds promise as a magnetically conned
fusion (MCF) plasma diagnostic for ITER and beyond. The measured
x-ray brightness can be used to determine impurity concentrations,
electron temperatures, n2e Zeff products, and to probe the
electron energy distribution. However, in order to be eective,
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 100K pixels has been measured at
Dectris Laboratory. X-rays emitted a tube under high voltage
bombards various elements such that they emit x-ray lines from
Zr-L to Sn-K 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 congured for 1D or 2D imaging MCF
plasmas with typical spatial, energy, and temporal resolution of 1
cm, 0.6 keV, and 5 ms, respectively.
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