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- W4386250683 abstract "The New Experiments With Spheres - Gas (NEWS-G) group at Queen's University uses Spherical Proportional Counters (SPCs) in the search for dark matter. Incoming radiation interacts with the gas inside the SPC through ionization, producing electron/ion pairs [1]. These primary electrons drift towards the central anode under the influence of an electric field [1]. A secondary ionization, termed avalanche, occurs at distances proportional to the size of the anode resulting in the multiplication of charges [1]. The signal that is produced is proportional to the number of secondary charges created during the avalanche [1]. A 30 cm-diameter sphere was used to characterize a six anode, spherical Bakelite prototype sensor. The sensor is divided into north and south three-anode read-out channels. To study the detector's response, an Fe55 source was placed inside the sphere, which was then filled with 1 bar of 40Ar+CH4 2% gas. The source was moved around the sphere with thirty-second data-taking runs taken at each point and high voltages applied to each channel. Cuts were applied to the event properties to isolate the 5.9 keV Fe55 peak. The peak was plotted as a histogram and fit with a Gaussian function with two additional linear terms. The gain and resolution of the sensor were extracted from the fit parameters. The channel dominance change angle was calculated by interpolating the number of events recorded by each channel at each point on the sphere. The gain, number of events and the channel dominance change angle were mapped on the sphere between 20 and 40 cm arc length in the theta direction, and all the way around the sphere in the phi direction to improve the understanding of the Bakelite sensor. References [1] G. Savvidis, Sensor Characterization and Fiducial Volume Studies for the NEWS-G Dark Matter Experiment, Queen's University, Kingston, 2023." @default.
- W4386250683 created "2023-08-30" @default.
- W4386250683 creator A5092815635 @default.
- W4386250683 date "2023-08-29" @default.
- W4386250683 modified "2023-09-27" @default.
- W4386250683 title "Characterization of the Bakelite Prototype Sensor for NEWS-G" @default.
- W4386250683 doi "https://doi.org/10.24908/iqurcp16720" @default.
- W4386250683 hasPublicationYear "2023" @default.
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