PoS - Proceedings of Science
Volume 444 - 38th International Cosmic Ray Conference (ICRC2023) - Gamma-ray Astronomy (GA)
First demonstration and operation of a roller-driven timestamp mechanism for GRAINE 2023 balloon-borne experiment
M. Oda*, S. Aoki, T. Azuma, T. Kato, S. Nagahara, K. Okamoto, S. Takahashi, K. Yamada, T. Yamamoto, M. Yamashita and S. Yoneno
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Pre-published on: August 12, 2023
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A multi-stage shifter allows timestamped measurements by emulsion films, which have a thinmedium and high resolution (< 1μm).
Using multiple layers of emulsion films that move indifferent speeds like hands of an analog clock, the shifter can create a unique positional displacements with respect to the time track recorded.
Time information of each tracks is obtained by reproducing each positional displacements by track reconstruction.
The GRAINE project aims for precise observation of cosmic gamma rays (10 MeV– 100 GeV) using a balloon-borne telescope with nuclear emulsion films.
The emulsion telescope mounts multi-stage shifter as time stamper.
It has obtained sub-second time resolution in the 2018 balloon experiment, which realized the highest resolution imaging of the Vela pulsar(> 80 MeV).
For scientific observation, the emulsion telescope needs scale up and expansion of driving time.
So we developed a new model of shifter with lighter structure to enable a large aperture area and long-duration observation times by adding more layers.
Operational test suggested that the new shifter has the sub-second time resolution, which allows emulsion gamma-ray telescope to obtain a imaging resolution within 1 degree like previous balloon experiment.
We are preparing for the next balloon-borne experiment in Australia by JAXA Scientific Ballooning from March to May 2023.
In this poster, we present the preparations and details involved in this experiment about the multi-stage shifter.
DOI: https://doi.org/10.22323/1.444.0832
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