2026-09-20T18:52:50Zhttps://api.mountainscholar.org/server/oai/request

oai:mountainscholar.org:10217/2365642025-12-30T03:25:56Zcom_10217_100532com_10217_100000com_10217_100499com_10217_100303col_10217_182111col_10217_100500

Fogarty, Samuel J., author Harton, John, advisor Mooney, Michael, committee member Menoni, Carmen, committee member 2023-06-01T17:27:02Z 2023-06-01T17:27:02Z 2023 Fogarty_colostate_0053N_17617.pdf https://hdl.handle.net/10217/236564 https://doi.org/10.25675/3.02431 Liquid argon time-projection chambers (LArTPCs) are used to detect charged particles and measure their properties. Charged particles that pass through the liquid argon (LAr) in a LArTPC ionize and excite argon atoms, producing ionization electrons and prompt scintillation light. The ionization electrons drift through the LAr volume in a uniform electric field and produce a signal at the anode. The scintillation light is used to determine the drift coordinate of an event, which allows for 3D reconstruction of tracks and interactions. Electro-negative impurities lead to the reduction of the ionization electrons and scintillation light. They worsen a detector's ability to perform event reconstruction by reducing the signal-to-noise ratios. A purity monitor is a device that is often used alongside LArTPCs to monitor the LAr purity. It extracts electrons from a photo-cathode via the photoelectric effect and drifts them through LAr to an anode using an electric field. When traversing the purity monitor, some of the electrons will be lost due to impurities along the way. As a result, the drift-electron lifetime, which is related to the LAr impurity concentration, can be determined by measuring the difference in charge between the cathode and anode. This method allows for continuous purity monitoring of the LAr used in a LArTPC. This thesis describes the development and testing of a purity monitoring system that is used in conjunction with a LArTPC at Colorado State University. born digital masters theses English eng Colorado State University. Libraries 2020- Copyright and other restrictions may apply. User is responsible for compliance with all applicable laws. For information about copyright law, please see https://libguides.colostate.edu/copyright. DUNE LArTPC purity monitor Fermilab detector liquid argon Development of a liquid argon purity monitoring system Text Master of Science (M.S.) Masters Physics Colorado State University This Item is protected by copyright and/or related rights (https://rightsstatements.org/vocab/InC/1.0/). You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s). open.access