Principle of the MPX detector. Anode wires are stretched with separation. The distance between the anode and each cathode plane is .
Calculated photon detection efficiency (absorption probability in the detection gas) vs photon energy for different gas mixtures (90% Ar, Xe, Kr, and 10% ) and absorber foils ( Be and Al), as indicated in the figure.
The MPX gas gain dependence on the applied voltage.
Schematic illustration of the MPX implementation on TCV showing the poloidal cross section of the vacuum vessel, the helium-filled camera, the detector, and the lines of sight.
Photograph of the MPX detector (rectangular box) and helium-filled camera (cylindrical just above) on TCV.
X-ray intensity time traces (a) and poloidal profiles (b), the dashed lines indicate the times and the chord position (shot 22610).
Multiharmonic mode with components resonant on the surface, in a highly elongated plasma with broad current profile (21621).
Nonlocalized x-ray burst produced by nonthermal electrons at the end of the ECCD pulse in low density discharge (21969, , , ). Contribution of low-energy photons was filtered by the aluminum foil of thickness .
Periodic localized x-ray bursts followed by the ECCD pulse in phase with an , mode in result of impingement of nonthermal electrons with plasma-facing components (21971, , , ). Contribution of low-energy photons was filtered by the aluminum foil of thickness .
X-ray intensity time traces at ECH switch on, (a); corresponding ECH power deposition profiles (solid line TORAY, dashed COBRA) (b) (18314).
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