Sealed operation, and circulation and purification of gas in the HARPO TPC
LLR, Ecole Polytechnique, CNRS/IN2P3, 91128 Palaiseau, France
2 IRFU, CEA Saclay, 91191 Gif-sur-Yvette, France
3 DEN/DANS/DPC/SECR/LRMO, CEA Saclay, 91191 Gif-sur-Yvette, France
Published online: 21 February 2018
HARPO is a time projection chamber (TPC) demonstrator of a gamma-ray telescope and polarimeter in the MeV-GeV range, for a future space mission. We present the evolution of the TPC performance over a five month sealed-mode operation, by the analysis of cosmic-ray data, followed by the fast and complete recovery of the initial gas properties using a lightweight gas circulation and purification system.
© The Authors, published by EDP Sciences, 2018
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (http://creativecommons.org/licenses/by/4.0/).