June 27, 2021 to July 1, 2021
Europe/Brussels timezone

Energy-Resolved Neutron Imaging with Glass Gas Electron Multiplier and Dynamic Time-over-Threshold Signal Processing

Not scheduled
Gather.town (Online)



Poster presentation only Applications Poster session 1


Yuki Mitsuya (The University of Tokyo)


Recent micro pattern gaseous detectors (MPGDs) have many readout channels for high-resolution imaging and large-area sensitivity. Reducing the circuit complexity while maintaining its performance is important for the readouts of large-scaled and high-resolution detectors.

The time-over-threshold (ToT) is a pulse processing technique which converts an analogue pulse height into a digital pulse width. Its advantages over ADC-based pulse-height measurement are less circuit complexity, lower power consumption, and pin-saving digital output interface. However, the conventional ToT suffers from the non-linearity between input pulse height and output time width. To overcome this problem, the dynamic time-over-threshold (dToT) has been proposed[1]. In dToT, the threshold is dynamically changed over time to improve the conversion linearity. We have demonstrated X-ray imaging with a glass gas electron multiplier (G-GEM) and a dToT-based readout system [2].

In this research, we demonstrated energy-resolved neutron imaging with a G-GEM and a dToT-based readout system. The measurement was conducted in J-PARC MLF beam line 10. The experimental setup of detector and readout is shown in Figure.1. We demonstrated energy-resolved neutron imaging by performing charge-division imaging simultaneously with neutron time-of-flight (TOF) measurement. The result is shown in Figure. 2. We obtained different images for different neutron energy regions. In conclusion, we have successfully performed energy resolved neutron imaging with a G-GEM and a dToT-based readout system.

[1] T. Orita, K. Shimazoe and H. Takahashi, The dynamic time-over-threshold method for multi-channel APD based gamma-ray detectors, Nucl. Instrum. Meth. A 775 (2015) 154
[2] Y. Mitsuya, T. Fujiwara, H. Takahashi, M. Uesaka, “X-ray imaging demonstration of glass GEM detector with dynamic time-over-threshold-based readout,” Journal of Instrumentation, 13, P12023 (2018)

Primary author

Yuki Mitsuya (The University of Tokyo)


Dr Kenji Shimazoe (The University of Tokyo) Dr Takeshi Fujiwara (AIST) Prof. Hiroyuki Takahashi (The University of Tokyo)

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