Data processing for soft X-ray diagnostics based on GEM detector measurements for fusion plasma imaging

The measurement system based on GEM – Gas Electron Multiplier detector is developed for X-ray diagnostics of magnetic confinement fusion plasmas. The Triple Gas Electron Multiplier (T-GEM) is presented as soft X-ray (SXR) energy and position sensitive detector. The paper is focused on the measuremen...

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Bibliographic Details
Published in:Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms Beam interactions with materials and atoms, 2015-12, Vol.364, p.54-59
Main Authors: Czarski, T., Chernyshova, M., Pozniak, K.T., Kasprowicz, G., Byszuk, A., Juszczyk, B., Wojenski, A., Zabolotny, W., Zienkiewicz, P.
Format: Article
Language:English
Subjects:
Computer programs
Data acquisition
Data processing
Detectors
FPGA
Fusion plasma
GEM detector
Imaging
Plasma (physics)
Soft x-rays
Software
X-rays
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Summary:The measurement system based on GEM – Gas Electron Multiplier detector is developed for X-ray diagnostics of magnetic confinement fusion plasmas. The Triple Gas Electron Multiplier (T-GEM) is presented as soft X-ray (SXR) energy and position sensitive detector. The paper is focused on the measurement subject and describes the fundamental data processing to obtain reliable characteristics (histograms) useful for physicists. So, it is the software part of the project between the electronic hardware and physics applications. The project is original and it was developed by the paper authors. Multi-channel measurement system and essential data processing for X-ray energy and position recognition are considered. Several modes of data acquisition determined by hardware and software processing are introduced. Typical measuring issues are deliberated for the enhancement of data quality. The primary version based on 1-D GEM detector was applied for the high-resolution X-ray crystal spectrometer KX1 in the JET tokamak. The current version considers 2-D detector structures initially for the investigation purpose. Two detector structures with single-pixel sensors and multi-pixel (directional) sensors are considered for two-dimensional X-ray imaging. Fundamental output characteristics are presented for one and two dimensional detector structure. Representative results for reference source and tokamak plasma are demonstrated.
ISSN:0168-583X
1872-9584
DOI:10.1016/j.nimb.2015.08.092