Methodology for an experimental drift velocity determination using a μTPC. Example in a 700mbar 95%He+5%CO2 mixture

• Published in: EPJ Web of conferences Vol. 288; no. 10016; p. 10016
• Main Authors: Vinchon, Thibaut, Petit, Michael
• Format: Conference Proceeding Journal Article
• Language: English
• Published: EDP Sciences 21.11.2023
• Subjects: Computer Science; drift velocity; Engineering Sciences; fluence; magboltz; neutron; Physics; time projection chamber (tpc); Magboltz; Fluence; Time Projection Chamber (TPC); Neutron; drift velocity
• ISSN: 2100-014X; 2100-014X
• DOI: 10.1051/epjconf/202328810016

The micro-irradiation, neutron metrology and dosimetry laboratory of the Institute for Radiological Protection and Nuclear Safety (IRSN) is a National Metrological Institute associated laboratory, is in charge of the neutron fluence distribution references and produces neutron reference fields. The laboratory is developing a primary neutron-detector based on the use of Time Projection Chamber technology. This detector, called µTPC, can use different types of gas over a range of precise pressures. The analysis of TPC data requires the determination of both the energy and the track direction of the recoil particles. The drift velocity in the gas is a key data point for analysis. Based on several experimental measurements performed using the µTPC with monoenergetic neutron fields, a direct methodology to determine the drift velocity can be proposed. These results are compared with those found using theoretical drift velocity from the Magboltz simulation.