Towards the trapping of electrons in the Geonium Chip Penning trap

The Geonium Chip Penning trap is a unique scalable Penning trap technology with applications in quantum technology, with a particular focus on the detection of single microwave photons. The trap has not yet demonstrated the trapping of electrons, but this thesis includes work towards this goal. A comprehensive photoelectric characterisation of the cryogenic trapping chamber has been undertaken, with applications in leak detection and the validation of the electrostatic model of the trap, among others. The calibration of a novel planar magnetic field source has been undertaken, which has been verified by the measurement of homogeneous magnetic fields of up to 500 mT. This scalable magnetic field source has other potential engineering applications. A control program for the magnetic field source has been implemented, which provides active quench protection and controls the magnetic field distribution. A new trap loading procedure has been programmed, which implements an electron impact ionisation technique. An ionisation curve has been obtained which is in good agreement with that of helium, which suggests that secondary electrons are being produced in the trap. Resistive wall destabilisation has been investigated which has resulted in new electronic filters

Exploring adaptations to the clinical reasoning cycle for forensic mental health nursing : a qualitative enquiry

Forensic mental health nurses (FMHN) provide care to address the needs of people who have mental illnesses across a range of diverse settings. The Clinical Reasoning Cycle (CRC) has been identified as a potential framework to assist FMHNs; however, adaptations were required to reflect the unique nature of the clinical setting. This study aimed to explore adaptations made to determine suitability prior to implementation in practice. Nominal Group Technique was used to explore suggested adaptations determined from a previous study and reach a consensus on the changes. Fourteen senior nurses from a state-wide Forensic mental Health (FMH) service participated. A consensus was reached for two proposed changes. Data were analysed using thematic analysis. Three main themes were interpreted from the data; FMH adaptations are warranted, the focus of the CRC, and who owns the cycle? Nurses in this study considered the need to include offence and risk issues due to the impact these factors have on the therapeutic relationship and cognitive bias; however, they also identified the need to focus on recovery-oriented care while engaging in clinical reasoning. Nurses in this study also expressed some reluctance for nursing to ‘own' the model, due to concern that ownership may cause division among the team or result in inconsistency in care. However, some participant's suggested the CRC with adaptations assisted FMH nurses to articulate their specialist skills and knowledge to others and highlight the nursing contribution to care. Further work is needed to finalize adaptations with a focus on engaging the consumer carer workforce and interdisciplinary team. © 2022 The Authors. International Journal of Mental Health Nursing published by John Wiley & Sons Australia, Ltd

Planar, strong magnetic field source for a chip ion trap

We present a planar, scalable magnetic field source, originally conceived for a chip ion trap. It consists of two symmetric sections, each with several independent currents arranged in coplanar, concentric rectangular loops. The currents allow for tuning the strength of the field and its lowest-order derivatives at one discretional position along the source’s vertical symmetry axis, a few mm above its surface. We describe the construction and calibration of the device and the cryogenic setup. The two most important current configurations for a Penning ion trap, the homogeneous field and the magnetic bottle, are investigated experimentally. Homogeneous fields around 0.5 T are routinely reached. We discuss the maximum attainable field, and we briefly describe ongoing further developments aiming at homogeneous fields well above 1 T

Coherent coupling of a trapped electron to a distant superconducting microwave cavity

We investigate theoretically the coupling of a single electron in a planar Penning trap with a remote superconducting microwave cavity. Coupling frequencies around Ω = 2π · 1 MHz can be reached with resonators with a loaded quality factor of Q = 10^5, allowing for the strong coupling regime. The electron and the cavity form a system of two coupled quantum harmonic oscillators. This is a hybrid and linear microwave quantum network. We show that the coherent interaction can be sustained over distances of a few mm up to several cm. Similar to classical linear MW circuits, the coherent quantum exchange of photons is ruled by the impedances of the electron and cavity. As one concrete application, we discuss the entanglement of the cyclotron motions of two electrons located in two separate traps

Flux pumping of multiple double-loop superconducting structures for a Planar magnetic field source

We discuss how flux pumping can be applied to multiple inductively coupled superconducting circuits, and describe its importance to the operation of a novel, planar magnetic field source for quantum technology applications. Specifically, we discuss how applying a transformer-rectifier flux pumping technique to several double-loop superconducting structures simultaneously allows for the effect of cross-talk — the inevitable coupling between neighbouring superconducting loops — to be accounted for. Using both a theoretical model and an experimental verification, we introduce a method of calibrating a flux-pumped magnetic field source such that any desired magnetic field distribution within the critical current limits of the used materials can be obtained

Open data from the third observing run of LIGO, Virgo, KAGRA and GEO

The global network of gravitational-wave observatories now includes five detectors, namely LIGO Hanford, LIGO Livingston, Virgo, KAGRA, and GEO 600. These detectors collected data during their third observing run, O3, composed of three phases: O3a starting in April of 2019 and lasting six months, O3b starting in November of 2019 and lasting five months, and O3GK starting in April of 2020 and lasting 2 weeks. In this paper we describe these data and various other science products that can be freely accessed through the Gravitational Wave Open Science Center at https://gwosc.org. The main dataset, consisting of the gravitational-wave strain time series that contains the astrophysical signals, is released together with supporting data useful for their analysis and documentation, tutorials, as well as analysis software packages.Comment: 27 pages, 3 figure

Open data from the third observing run of LIGO, Virgo, KAGRA, and GEO

The global network of gravitational-wave observatories now includes five detectors, namely LIGO Hanford, LIGO Livingston, Virgo, KAGRA, and GEO 600. These detectors collected data during their third observing run, O3, composed of three phases: O3a starting in 2019 April and lasting six months, O3b starting in 2019 November and lasting five months, and O3GK starting in 2020 April and lasting two weeks. In this paper we describe these data and various other science products that can be freely accessed through the Gravitational Wave Open Science Center at https://gwosc.org. The main data set, consisting of the gravitational-wave strain time series that contains the astrophysical signals, is released together with supporting data useful for their analysis and documentation, tutorials, as well as analysis software packages

Exploration of the utility of the nursing process and the clinical reasoning cycle as a framework for forensic mental health nurses : a qualitative study

Forensic mental health nursing (FMHN) is a specialized field, designed to meet the needs of people who have a serious mental illness across the criminal justice system, inpatient services and community. Frameworks can assist assessment, planning, intervention, documentation and evaluation of nursing care. However, there is no prior research investigating frameworks in FMHN. This study aimed to explore the Nursing Process (NP) and the Clinical Reasoning Cycle (CRC), with nurses, to determine a suitable framework for use service-wide. A Nominal Group Technique was used to facilitate exploration of the two frameworks, where open-ended verbal and written responses collected from a Nominal Group were thematically analysed, and the participants voted on their preferred framework. Seventeen nurses from a state-wide forensic mental health (FMH) service participated. The four main themes were as follows: challenges to current practice, limitations of the NP, perceived benefits of the CRC and addressing implementation. Consensus was reached with the nurses selecting the CRC as the framework of choice. This is the first study to explore frameworks to guide practice in FMHN. Nurses in this study considered the CRC to be a suitable framework for novice through to expert, offering a contemporary framework to guide nursing care in complex FMH settings. Some adjustments to the existing cycle were suggested to emphasize recovery-oriented practice, and inclusion of family and carers. Any changes to the cycle warrant exploration with the interdisciplinary team and consumer carer workforce. © 2021 John Wiley & Sons Australia, Ltd