Multi-energy calibration of a PILATUS3 CdTe detector for hard x-ray measurements of magnetically confined fusion plasmas

A multi-energy hard x-ray pin-hole camera based on the PILATUS3 X 100K-M CdTe detector has been developed at the Princeton Plasma Physics Laboratory for installation on the Tungsten Environment in Steady State Tokamak. This camera will be employed to study thermal plasma features such as electron te...

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Veröffentlicht in:Review of scientific instruments 2021-02, Vol.92 (2), p.023105-023105
Hauptverfasser: Barbui, T., Delgado-Aparicio, L. F., Pablant, N., Disch, C., Luethi, B., Pilet, N., Stratton, B., VanMeter, P.
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container_end_page 023105
container_issue 2
container_start_page 023105
container_title Review of scientific instruments
container_volume 92
creator Barbui, T.
Delgado-Aparicio, L. F.
Pablant, N.
Disch, C.
Luethi, B.
Pilet, N.
Stratton, B.
VanMeter, P.
description A multi-energy hard x-ray pin-hole camera based on the PILATUS3 X 100K-M CdTe detector has been developed at the Princeton Plasma Physics Laboratory for installation on the Tungsten Environment in Steady State Tokamak. This camera will be employed to study thermal plasma features such as electron temperature as well as non-thermal effects such as fast electron tails produced by a lower hybrid radiofrequency current drive and the birth of runaway electrons. The innovative aspect of the system lies in the possibility of setting the threshold energy independently for each of the ∼100k pixels of the detector. This feature allows for the measurement of the x-ray emission in multiple energy ranges with adequate space and time resolution (∼1 cm, 2 ms) and coarse energy resolution. In this work, the energy dependence of each pixel was calibrated within the range 15 keV–100 keV using a tungsten x-ray tube and emission from a variety of fluorescence targets (from yttrium to uranium). The data corresponding to pairs of Kα emission lines are fit to the characteristic responsivity (“S-curve”), which describes the detector sensitivity across the 64 possible energy threshold values for each pixel; this novel capability is explored by fine-tuning the voltage of a six-bit digital-analog converter after the charge-sensitive amplifier for each of the ∼100k pixels. This work presents the results of the calibration including a statistical analysis. It was found that the achievable energy resolution is mainly limited by the width of the S-curve to 3 keV–10 keV for threshold energies up to 50 keV, and to ≥20 keV for energies above 60 keV.
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source AIP Journals Complete; Alma/SFX Local Collection
subjects Calibration
Cameras
Digital to analog converters
Electron energy
Emission
Energy
Energy resolution
Fluorescence
Nonthermal effects
Pixels
Plasma physics
Radio frequency
S curves
Scientific apparatus & instruments
Sensors
Statistical analysis
Temperature effects
Thermal plasmas
Tungsten
Uranium
X ray tubes
Yttrium
title Multi-energy calibration of a PILATUS3 CdTe detector for hard x-ray measurements of magnetically confined fusion plasmas
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