2022/02/18 by Ito, Hiroshi
#FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #Instrumentation and Detectors (physics.ins-det) #Instrumentation and Methods for Astrophysics (astro-ph.IM)
paper · doi:10.48550/arxiv.2202.08983
A gaseous time-projection chamber (TPC) with a reconstructable z coordinate for nuclear recoil tracks has been developed for dark-matter searches and α particle imagings in a low radioactivity background. A TPC with a sheet-resistor field cage shows a potential to detect charge and photons produced by tracks if the sheet resistor has optical transmittance for visible light, and determine a drift length from a time difference between these signals. In this study, an optical transmittance of sheet resistors was measured to be 24.5±0.1\rm stat±0.6\rm syst% for the \rm CF4 gas scintillating light using an α-particle source. The number of photoelectrons is observed to be \rm∼20~p.e. for 5.3~MeVα with the existence of a sheet resistor in the \rm CF4 gas. Then, it is discussed how many photoelectrons to be observable by using multi-alkali-cathode phototubes and SiPMs for near-infrared light in order to detect lower energy tracks.