First demonstration of a roller-driven timestamp mechanism for long-duration observations with high time resolution using large-area emulsion films. (7th November 2022)

• Record Type: Journal Article
• Authors: Oda, M; Aoki, S; Azuma, T; Kato, T; Nagahara, S; Takahashi, S; Yamada, K; Yamamoto, T; Yamashita, M
• Is Part Of: Progress of theoretical and experimental physics. Volume 2022:Number 11(2022)
• Publication Date: 2022-11-07
• Subjects: Physics -- Periodicals; Mathematical physics -- Periodicals; 530.05
• DOI: 10.1093/ptep/ptac143
• Languages: English
• ISSNs: 2050-3911

Abstract

Abstract: A multi-stage shifter allows timestamped measurements by emulsion films, which have a thin medium and high resolution (< 1μm). Using multiple layers of emulsion films that move at different speeds like hands of an analog clock, the shifter can create a unique positional displacement with respect to the time-track recorded. The time information of each track is obtained by reproducing each positional displacement by track reconstruction. We developed a new model of shifter with a lighter structure to enable a large aperture area and long-duration observation times by adding more layers. Operational testing suggested that the new shifter has a sub-second time resolution, which allows an emulsion gamma-ray telescope to obtain an imaging resolution within 1° (> 80 MeV), like previous balloon experiments. Furthermore, by adding a layer which move at 100 μm s -1, it achieved the 0.1 s time resolution required for high-resolution imaging above 1 GeV. We also found the possibilities of an almost three-fold improvement in the spatial resolutions in track reconstruction compared with the conventional model and of achieving time resolution on a scale of tens of milliseconds, which would enable phase resolution of a pulsar.