28 August 2022 to 2 September 2022
Science and Technology Campus, University of Parma
Europe/Rome timezone
Submission deadline for Conference Proceedings extended until 3 October

Development and test of a TDC and amplifier circuit for a multi-channel positron detector.

28 Aug 2022, 13:45
15m
Aula dei Cavalieri, University Central Palace, via Università 12

Aula dei Cavalieri, University Central Palace, via Università 12

Oral New techniques Student Day

Speaker

Marta-Villa de Toro Sanchez (Centre for Molecular and Materials Science, TRIUMF – School of Physics and Astronomy, The University of Edinburgh)

Description

In a continuous beam muon facility positrons are detected by relatively large plastic scintillators without position sensitivity. An idea has been proposed to make these positron detectors multi-channel and able to track the positron trajectories. This will ultimately enable 2-dimensional magnetic imaging of the sample with the µSR technique. To attain this “muon microscope” idea, large numbers of independent photosensors with high-timing resolution will be necessary.

Our group at KEK has developed an amplifier-shaper-discriminator (ASD) circuit named FGATI with 16 channels per chip and a high-resolution time to digital converter, called HR-TDC with a timing resolution on the order of picoseconds. Silicon photomultipliers (SiPMs) from Hamamatsu (MPPC) are employed to give electric pulses for the optical input [1-2]. We have been testing this new set-up at TRIUMF with a pulsed laser to understand the efficiency, transient response, timing resolution, and the data acquisition to a computer. We are now successfully detecting the rising and falling edge timing as well as the time-over-threshold (TOT) of the laser pulses.

The tested circuit will be a basis for the light detection and time recording from scintillation fiber arrays to be used for the multi-channel positron detectors. Multiple layers of such detectors will establish tracking the positron trajectory and aid with the development of the “muon microscope”.

This work is partially supported by a Grant-in-Aid for Scientific Research (No.JP21H04666) from Japan Society for the Promotion of Science (JSPS).

Reference
1 K.M. Kojima et al, JPS Conf. Proc., 21, 011062 1-6, (2018).
2 K.M. Kojima et al, J. Phys: Conf. Ser., 551, 012063, (2014).
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Primary authors

Marta-Villa de Toro Sanchez (Centre for Molecular and Materials Science, TRIUMF – School of Physics and Astronomy, The University of Edinburgh) Masayoshi Shoji (Insitute of Particle and Nuclear Studies, KEK) Masaya Miyahara (Insitute of Particle and Nuclear Studies, KEK) Ryotaro Honda (Insitute of Particle and Nuclear Studies, KEK) Manobu M. Tanaka (Insitute of Particle and Nuclear Studies, KEK) Takekazu Ishida (Division of Quantum and Radiation Engineering, Osaka Metropolitan University) Kenji M. Kojima (Centre for Molecular and Materials Science, TRIUMF, and Stewart Blusson Quantum Matter Institute, the University of British Columbia)

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