Divertor digital twins

University of York · Plasma Science & Fusion Energy · Oct 2023 – present (expected 2027)
Digital Twin Model Development for the Divertor in Fusion Power Plants

The divertor is the tokamak’s heat-exhaust component. It has to survive high loads over a plant lifetime. A digital twin is only useful if measurements actually constrain it, and if that reconstructed state can support through-life decisions rather than a snapshot of the present.

I treat that as three related problems: diagnostic design (how to instrument a plasma-facing component); reconstruction of fields from sparse sensors; and prognostics and health management. A designer emits machine-readable diagnostic configurations rather than leaving that step in a notebook. During my secondment at digiLab (Mar–May 2025) I applied this to divertor heat-flux data for NSTX-U and MAST-U plasma-facing components.

A first-author review in IEEE Access (2025); an IAEA oral on diagnostic design for divertor heat loads (October 2025); an IAEA poster on the Diagnostic Designer (May 2026); a diagnostic-layout preprint on SSRN (submitted).

Python, simulation, probabilistic modelling, HPC.

Divertor Diagnostic Designer GitHub · Publications & talks

Divertor tile temperature field with four thermocouple locations
Example BED thermocouple layout on a divertor tile temperature field (K). The markers are candidate sensor sites.

Assystem: nuclear data / digital

Data Scientist (Data / Digital Engineering) · Blackburn · Sep 2022 – Jan 2024

Nuclear and engineering programmes accumulate more operational and design data than teams can easily use under assurance constraints.

I led multi-client digital data-services work: analytics and data-platform workflows, plus an AI-in-fusion feasibility study (data integration and predictive modelling) that informed a tender bid.

Cut manual reporting; internal estimate of about £110k a year in avoided admin cost. The fusion feasibility work informed a £2M+ tender.

Python, SQL, Docker.

Assystem on data as a source of value Assystem

Mirada Medical: DLCExpert

Data Analyst (Medical Imaging / Auto-Contouring) · Oxford · Oct 2020 – Aug 2022

Manual organ-at-risk contouring for radiotherapy planning is slow and varies between observers.

I built production deep-learning auto-contouring pipelines for organs-at-risk in neuro-oncology, as part of Mirada’s DLCExpert product line.

Pipelines used in a shipped clinical product: more than 90% of contours usable, with planning time moving from hours toward minutes. Co-author on the 2023 Physica Medica EPTN atlas evaluation; that paper reports brainstem vDSC 0.92 / sDSC 0.84 and clinically acceptable dose (∆D within ±1 Gy for 92% of 26 OARs).

Python, deep learning for medical imaging.

Mirada radiation oncology Mirada · Physica Medica paper Physica Medica

Figure from the 2023 Physica Medica paper on automatic contouring
Source: Vaassen et al., Physica Medica 114, 103156 (2023) Physica Medica. Paper I co-authored.

Code & live apps

divertor-diagnostic-designer GitHub. Python toolkit for synthetic divertor diagnostics and thermocouple configurations, including HEAT-based heat-flux inputs.

BitViz bit-viz.com. Live Bitcoin visualisation product.

UK Energy Insight. UK electricity-price dashboard.

UK Cost of Living. UK cost-of-living dashboard.

Selected personal builds

Side projects (BitViz, dashboards, Assize)

BitViz

Interactive Bitcoin visualisation. bit-viz.com

BitViz adoption and usage dashboard

UK Energy Insight

Dashboard of UK electricity prices. Open the app

UK Cost of Living

Dashboard of UK cost-of-living data. Open the app

Assize

Concept for decentralised content moderation. Assize page