Hazel Lowe
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View article: Core-edge integrated predictive studies of ST40 and NSTX plasmas with the scrape-off layer box model
Core-edge integrated predictive studies of ST40 and NSTX plasmas with the scrape-off layer box model Open
The ability to model the interplay between the core and edge of tokamak plasmas is crucial to designing both the plasma operating scenario of a fusion pilot plant and the design of the tokamak itself. Scrape-off-layer (SOL) models that are…
View article: Transport Characteristics and Modelling of ST40 Hot Ion Plasmas
Transport Characteristics and Modelling of ST40 Hot Ion Plasmas Open
In this paper, the turbulent transport properties of ST40 hot ion plasmas are examined and fully predictive time evolving modelling of a hot ion plasma pulse was performed. Understanding turbulent transport on spherical tokamaks (STs) is c…
View article: Experimental observations of bifurcated power decay lengths in the near Scrape-Off Layer of ST40 High Field Spherical Tokamak
Experimental observations of bifurcated power decay lengths in the near Scrape-Off Layer of ST40 High Field Spherical Tokamak Open
View article: Overview of recent results from the ST40 compact high-field spherical tokamak
Overview of recent results from the ST40 compact high-field spherical tokamak Open
ST40 is a compact, high-field ( ) spherical tokamak (ST) with a mission to expand the physics and technology basis for the ST route to commercial fusion. The ST40 research programme covers confinement and stability; solenoid-fre…
View article: Application of interpretable machine learning for cross-diagnostic inference on the ST40 spherical tokamak
Application of interpretable machine learning for cross-diagnostic inference on the ST40 spherical tokamak Open
Machine learning models are exceptionally effective in capturing complex non-linear relationships of high-dimensional datasets and making accurate predictions. However, their intrinsic ``black-box'' nature makes it difficult to interpret t…
View article: From minimum-viable-products to full models: a step-wise development of diagnostic forward models in support of design, analysis and modelling on the ST40 tokamak
From minimum-viable-products to full models: a step-wise development of diagnostic forward models in support of design, analysis and modelling on the ST40 tokamak Open
Like most magnetic confined fusion experiments, the ST40 tokamak started off with a small subset of diagnostics and gradually increased the diagnostic set to include more complex and comprehensive systems. To make the most of each operatio…
View article: Experimental observations of bifurcated power decay lengths in the near Scrape-Off Layer of tokamak plasmas
Experimental observations of bifurcated power decay lengths in the near Scrape-Off Layer of tokamak plasmas Open
The scrape-off layer parallel heat flux decay lengths measured at ST40, a high field, low aspect ratio spherical tokamak, have been observed to bifurcate into two groups. The wide group matches closely with the scale of ion poloidal Larmou…
View article: Enhanced ion acceleration from transparency-driven foils demonstrated at two ultraintense laser facilities
Enhanced ion acceleration from transparency-driven foils demonstrated at two ultraintense laser facilities Open
Laser-driven ion sources are a rapidly developing technology producing high energy, high peak current beams. Their suitability for applications, such as compact medical accelerators, motivates development of robust acceleration schemes usi…
View article: Achievement of ion temperatures in excess of 100 million degrees Kelvin in the compact high-field spherical tokamak ST40
Achievement of ion temperatures in excess of 100 million degrees Kelvin in the compact high-field spherical tokamak ST40 Open
Ion temperatures of over 100 million degrees Kelvin (8.6 keV) have been produced in the ST40 compact high-field spherical tokamak (ST). Ion temperatures in excess of 5 keV have not previously been reached in any ST and have only been obtai…
View article: Denoising application for electron spectrometer in laser-driven ion acceleration using a Simulation-supervised Learning based CDAE
Denoising application for electron spectrometer in laser-driven ion acceleration using a Simulation-supervised Learning based CDAE Open
Real experimental measurements in high-radiation environments often suffer from a high-flux of background noise which can limit the retrieval of the underlying signal. It is important to have an effective method to properly remove unwanted…
View article: High-Intensity Laser-Driven Oxygen Source from CW Laser-Heated Titanium Tape Targets
High-Intensity Laser-Driven Oxygen Source from CW Laser-Heated Titanium Tape Targets Open
The interaction of high-intensity laser pulses with solid targets can be used as a highly charged, energetic heavy ion source. Normally, intrinsic contaminants on the target surface suppress the performance of heavy ion acceleration from a…
View article: Dynamics of laser-driven heavy-ion acceleration clarified by ion charge states
Dynamics of laser-driven heavy-ion acceleration clarified by ion charge states Open
Motivated by the development of next-generation heavy-ion sources, we have investigated the ionization and acceleration dynamics of an ultraintense laser-driven high- Z silver target, experimentally, numerically, and analytically. Using a …
View article: Demonstration of repetitive energetic proton generation by ultra-intense laser interaction with a tape target
Demonstration of repetitive energetic proton generation by ultra-intense laser interaction with a tape target Open
View article: Modeling radiative-shocks created by laser–cluster interactions
Modeling radiative-shocks created by laser–cluster interactions Open
Radiative-shocks induced by laser–cluster interactions are modeled using radiation-hydrodynamic simulations. A good agreement—in both shock velocity and density profiles—is obtained between experiment and simulations, indicating that non-l…
View article: Development of a multi keV x-ray backlighter source based on laser irradiation of extended cluster gases
Development of a multi keV x-ray backlighter source based on laser irradiation of extended cluster gases Open
High intensity laser-cluster interactions have been studied for over two decades and have demonstrated extremely e fficient coupling of the incident laser energy to the high local density extended cluster medium, launching a strong radiati…
View article: An <i>in-vacuo</i> optical levitation trap for high-intensity laser interaction experiments with isolated microtargets
An <i>in-vacuo</i> optical levitation trap for high-intensity laser interaction experiments with isolated microtargets Open
We report on the design, construction, and characterisation of a new class of in-vacuo optical levitation trap optimised for use in high-intensity, high-energy laser interaction experiments. The system uses a focused, vertically propagatin…