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 con ned
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 e ective,
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 con gured 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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