Proof-of-concept study of MeV gamma-ray imaging using a liquid argon time projection chamber for GRAMS

Satoshi Takashima; Hirokazu Odaka; Kentaro Shirahama; Kota Ishiwata; Ryutaro Tatsumi; Hodaka Kawamura; Tomohiro Hakamata; Marina Yoshimoto; Shin Watanabe; Tsubasa Tamba; Hiroki Yoneda; Shota Arai; Aya Bamba; Masahiro Ichihashi; Kazutaka Aoyama; Masashi Tanaka; Kohei Yorita; Kazuhiro Nakazawa; Keigo Okuma; Tsuguo Aramaki; Georgia Karagiorgi

doi:10.1117/12.3018323

11 September 2024 Proof-of-concept study of MeV gamma-ray imaging using a liquid argon time projection chamber for GRAMS

Satoshi Takashima, Hirokazu Odaka, Kentaro Shirahama, Kota Ishiwata, Ryutaro Tatsumi, Hodaka Kawamura, Tomohiro Hakamata, Marina Yoshimoto, Shin Watanabe, Tsubasa Tamba, Hiroki Yoneda, Shota Arai, Aya Bamba, Masahiro Ichihashi, Kazutaka Aoyama, Masashi Tanaka, Kohei Yorita, Kazuhiro Nakazawa, Keigo Okuma, Tsuguo Aramaki, Georgia Karagiorgi

Author Affiliations +

Proceedings Volume 13093, Space Telescopes and Instrumentation 2024: Ultraviolet to Gamma Ray; 130937R (2024) https://doi.org/10.1117/12.3018323
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Conference Poster

Abstract

We have developed a small liquid argon time projection chamber (LArTPC) called NanoGRAMS, whose fiducial volume is 5 × 5 × 10 cm3. A LArTPC has advantages of dense and large volumes sensitive to MeV gamma rays compared with multi-layer semiconductor detectors or gaseous ones. The aim of our work is proof-ofconcept studies for one of the important goals of Gamma-Ray and AntiMatter Survey (GRAMS). The imaging performance of Compton cameras is mainly determined by energy and position resolutions of the detector. The NanoGRAMS measures scintillation light and ionized electrons generated by interactions of gamma rays and argon atoms, which are reconstructed to information on the initial energies and momenta of incoming photons. The NanoGRAMS is equipped with photon detection boards loading a large-area array consisting of 4×4 single SiPMs, which totally cover 2.56×2.56 cm², and low-noise electron readout boards. The SiPM boards operate at a liquid argon (87 K) temperature and exhibit a fast response time below 100 ns allowing pulse shape discrimination to reject atmospheric neutron background. The electron readout system comprises an anode electrode segmented into 16×16 pixels with a 3.2mm pitch. Charge signals from all pixels are processed by four 64-channel low-noise readout ASICs originally developed for semiconductor detectors. We confirmed that this TPC has the capability of detecting scintillation light and electrons generated by α-rays in gaseous argon and gamma rays in liquid argon.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

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Satoshi Takashima, Hirokazu Odaka, Kentaro Shirahama, Kota Ishiwata, Ryutaro Tatsumi, Hodaka Kawamura, Tomohiro Hakamata, Marina Yoshimoto, Shin Watanabe, Tsubasa Tamba, Hiroki Yoneda, Shota Arai, Aya Bamba, Masahiro Ichihashi, Kazutaka Aoyama, Masashi Tanaka, Kohei Yorita, Kazuhiro Nakazawa, Keigo Okuma, Tsuguo Aramaki, and Georgia Karagiorgi "Proof-of-concept study of MeV gamma-ray imaging using a liquid argon time projection chamber for GRAMS", Proc. SPIE 13093, Space Telescopes and Instrumentation 2024: Ultraviolet to Gamma Ray, 130937R (11 September 2024); https://doi.org/10.1117/12.3018323

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