Use this URL to cite or link to this record in EThOS: https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.803945
Title: ARIADNE : design, construction and operation of a liquid argon time projection chamber with novel optical readout
Author: Roberts, Adam
Awarding Body: University of Liverpool
Current Institution: University of Liverpool
Date of Award: 2020
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Abstract:
Liquid Argon time projection chambers are poised to be a crucial tool to push the frontiers of physics. Two-phase Liquid Argon TPCs offer the potential for excellent signal-to-noise at modest cost, even on the kiloton scale. Worldwide R&D activities are ongoing, searching for ways of improving detector performance. The ARIADNE detector is exploring novel readout technologies for twophase Liquid Argon TPCs. ARIADNE is a one ton detector, designed to characterise optical readout techniques and assess their suitability as a potential alternative to more commonly used charge readout approaches. The construction of the detector including Geant4 and COMSOL electric field simulations that informed the design are detailed. Starting from readout using EMCCD cameras, the development and characterisation of a range of camera technologies has been studied. The performance of optical readout using EMCCD cameras was tested using the CERN T9 testbeam. Excellent x, y resolution was achieved. Limitations in z dimension reconstruction in high pileup environments motivated the development of a novel camera technology. A camera, based on the Timepix 3 ASIC, provides many benefits in the context of optical TPCs, with full x, y, z, E readout now made possible using a single camera. The camera was initially tested using a 100 mbar CF4 gas demonstrator TPC. Excellent 3D reconstruction of events was possible, even given the higher drift velocity seen in gas TPCs. Calorimetry studies found clear energy peaks, corresponding to the Americium-241 alpha source placed inside the TPC. Moreover, the Bragg peak of stopping alpha tracks was seen and measured. The camera based on Timepix 3 was also tested using ARIADNE. Once again, excellent 3D reconstruction was possible. The slower drift velocity of electrons in Liquid Argon gave a z position resolution on the millimeter scale. Synchronisation of the camera with an external PMT was tested successfully. Measurements of electron lifetime were taken using the camera. Preliminary studies provided a rough energy calibration, allowing a single stopping muon candidate to be characterised. Preliminary testing using a large 1m 1m field of view are promising in terms of sensitivity. Extrapolation of the results in order to image a volume similar to the DUNE detector is discussed.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.803945  DOI:
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