研究目的
Developing a new single-photon-counting readout chip for powder diffraction experiments with improved performance in terms of noise, count rate capability, and threshold uniformity.
研究成果
The MYTHEN 3.0.1 prototype ASIC meets all design specifications, offering improved performance over its predecessor, MYTHEN II, in terms of dead time, threshold dispersion, and noise. This advancement opens new possibilities for future experiments, especially in high-intensity environments. Further improvements are expected with the next iteration of the chip.
研究不足
The study is based on a prototype chip, and further optimization is needed to reduce noise and improve performance. The next iteration of the chip, MYTHEN 3.0.2, is under test to address these limitations.
1：Experimental Design and Method Selection:
The MYTHEN
2：1 prototype readout chip was designed in 110 nm UMC technology, featuring 64 channels with 50 μm pitch. It includes a preamplifier and a shaper with adjustable feedback to control gain, speed, and electronic noise. Sample Selection and Data Sources:
The chip was tested with fluorescence X-rays and a synchrotron beam to characterize its noise and count rate capability.
3：List of Experimental Equipment and Materials:
The setup included a silicon microstrip detector and a synchrotron beamline for testing.
4：Experimental Procedures and Operational Workflow:
Threshold scans were performed at different photon energies to calibrate the chip. The rate capability was measured by varying the beam intensity and comparing detected rates to theoretical rates.
5：Data Analysis Methods:
The threshold dispersion and equivalent noise charge were calculated from the threshold scans. The rate capability was analyzed using a paralyzable counter model to determine the dead time.
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