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An inductive superconducting transition-edge nano-detector for nano-dosimetry applications.

Li, Bo (2018) An inductive superconducting transition-edge nano-detector for nano-dosimetry applications. Doctoral thesis, University of Surrey.

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In this thesis I have demonstrated the feasibility of using Inductive Superconducting Transition-Edge Sensor (ISTED) as an excellent nanodosimeter for nano-dosimetry applications. This thesis can be divided broadly into two parts. In the first part, I begin by addressing how the study of low energetic ionising particles in liquid water using concepts from classical mechanics is a valid approach, despite being inside the quantum-classical boundary regime. Based on the circumstantial validity condition, I showed that the percentage uncertainties in nanodosimetric quantities due to Heisenberg's uncertainty principle for sub- 1 keV electrons in liquid water as calculated by GEANT4-DNA is not significant enough to cause changes to their distributions. Important nanodosimetric quantities studied in details are ionisation cluster-size distribution, second order of moment for cluster-size distribution (M$_2$) and the cumulative frequency of ionisation cluster-size distribution from cluster-size two (F$_2$). In the second part of my thesis, I have focussed on the design, optimisation, fabrication, characterisation of the superconducting devices. An ISTED is made from three components: a) a Superconducting Quantum Interference Device (SQUID), b) a superconducting thin-film and c) a top layer of thin-film Carbon absorber. I have measured the magnetic flux noise of a nanoSQUID of loop dimension 350 nm and nano- Josephson junctions of dimensions 65 nm x 65 nm as $3 \times 10^{-14} \Phi_0^2$ in the white noise region. It is shown that the measured nanoSQUID is more than capable of sub- 10 eV energy detection.

Item Type: Thesis (Doctoral)
Divisions : Theses
Authors :
Li, Bo6284125
Date : 31 August 2018
Funders : EPSRC - Engineering and Physical Sciences Research Council
DOI : 10.15126/thesis.00848851
Contributors :
Depositing User : Bo Li
Date Deposited : 06 Sep 2018 08:25
Last Modified : 06 Sep 2018 09:29

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