First operation of LArTPC in the stratosphere as an engineering GRAMS balloon flight (eGRAMS)

Abstract

GRAMS (Gamma-Ray and AntiMatter Survey) is a next-generation balloon/satellite experiment utilizing a LArTPC (Liquid Argon Time Projection Chamber), to simultaneously target astrophysical observations of cosmic MeV gamma-rays and conduct an indirect dark matter search using antimatter. While LArTPCs are widely used in particle physics experiments, they have never been operated at balloon altitudes. An engineering balloon flight with a small-scale LArTPC (eGRAMS) was conducted on July 27th, 2023, to establish a system for safely operating a LArTPC at balloon altitudes and to obtain cosmic-ray data from the LArTPC. The flight was launched from the Japan Aerospace Exploration Agency's (JAXA) Taiki Aerospace Research Field in Hokkaido, Japan. The total flight duration was 3 hours and 12 minutes, including a level flight of 44 minutes at a maximum altitude of 28.9 km. The flight system was landed on the sea and successfully recovered. The LArTPC was successfully operated throughout the flight, and about 0.5 million events of the cosmic-ray data including muons, protons, and Compton scattering gamma-ray candidates, were collected. This pioneering flight demonstrates the feasibility of operating a LArTPC in high-altitude environments, paving the way for future GRAMS missions and advancing our capabilities in MeV gamma-ray astronomy and dark matter research.

References in corpus (12)

• DarkSide-20k: A 20 Tonne Two-Phase LAr TPC for Direct Dark Matter Detection at LNGS
• Design and Construction of the MicroBooNE Detector
• Possible dark matter annihilation signal in the AMS-02 antiproton data
• The first COMPTEL Source Catalogue
• Dual MeV Gamma-Ray and Dark Matter Observatory -- GRAMS Project
• Diffuse emission measurement with INTEGRAL/SPI as indirect probe of cosmic-ray electrons and positrons
• Antideuteron Sensitivity for the GAPS Experiment
• Gamma-ray Astrophysics in the MeV Range: the ASTROGAM Concept and Beyond
• A Regenerable Filter for Liquid Argon Purification
• Event reconstruction of Compton telescopes using a multi-task neural network
• Reconstruction of multiple Compton scattering events in MeV gamma-ray Compton telescopes towards GRAMS: the physics-based probabilistic model
• Preliminary Results from the 1999 Balloon Flight of the Liquid Xenon Gamma-Ray Imaging Telescope (LXeGRIT)

Cited by in corpus (2)

• Constraints on dark matter with future MeV gamma-ray telescopes
• Antihelium-3 Sensitivity for the GRAMS Experiment