International Doctoral College in Fusion Science and Engineering
 Thesis catalogue
Fibre-optic steady-state magnetic field measurements
PhD Code: 2016-DC-09:
  • Host institute 1: AM07-Aix- Marseille Université (Home University) - FP8-Institut de Recherche sur la Fusion par confinement magnétique, Saint-Paul-lez-Durance, France (Home Institution)
  • Host institute 2: AM34- Université de Mons (Host University) - AM24- SCK.CEN (Host Institution)
  • Host institute 3: AM04-ITER Organization
Research fields:
  • F2. Technology for ITER and beyond
  • Prof. Michel Lequime (promotor)
  • Prof. Patrice Mégret (co-promotor)
  • Dr. Philippe Moreau (mentor)
  • Dr. Andrei Goussarov (mentor)
  • Dr. George Vayakis (mentor)
Contact Person and email: George Vayakis -

Subject description
Background: ITER uses a variety of magnetic sensors to deduce equilibrium and transient magnetic properties. Most of these sensors are traditional inductive sensors relying on integration of voltages induced in coils and loops. For long-pulse operation of ITER and also looking beyond ITER at DEMO, steady state measurements will also be needed. ITER will use metal film based Hall probes and also fibre-optic current sensors. The detailed design of electronics and sensors for these systems is still in an early phase of development, whilst the hardware infrastructure to deliver fibres to the ITER sensing locations is in an advanced state. R&D on the detailed solutions for ITER is timely. IRFM has been working on steady-state magnetic diagnostcsi for many years, including fibre-optic sensors and has further plans for such sensors in the WEST project. SCK*CEN has been developing radiation hard fibre-based instrumentation for many applications, including fusion.

Expected outcomes

Objective: Development of a detailed design for the fibre optic current sensor sense fibre, transmission fibre, opto-electronics and software specification, for two applications: integrated current within the fibre-optic current sensor loops and time-resolved polarimetry for the tangential magnetic field (POTDR). Design of the software architecture. Development and testing of bench prototypes. Modelling of the synthetic diagnostic and its cross-check against other steady-state discrete sensors and inductive measurements. Modeling of correction / integrated algorithms to devise the plasma shape combining inductive and steady-state data. Time line and mobility scheme (research need to be performed for at least six month in two different countries): Time line and mobility scheme (research need to be performed for at least six month in two different countries): 1st year (October 2016-September 2017): M1-3: IRFM Understanding of tokamak parameters and operation with relation to magnetics; Study of past work and data of prototype system at Tore Supra. Study of FOCS installations on West project. M4-6: ITER Study of baseline FOCS design for ITER, understanding of the radiation environment in a fusion reactor, outline design for the FOCS back-end M7-12: SCK*CEN: Work on the magnetics test bench; identifying of nuisance parameters; preliminary performance assessment; Assessment and selection of ITER fibre candidates 2nd year: (October 2017-September 2018): M1-6 Measurements and data analysis on WEST M7-9 SCK*CEN: revision and work on test bench; data modeling and interpretation; verification of performance expected M9-12 ITER Preparation of detailed design and performance analysis documentation 3rd year (October 2018-September 2019): M1-3 IRFM Work review and revision including ITER design review M4-6 SCK*CEN revision and work on test bench; final simulations of performance M7-12 IRFM Write up of thesis and submission


Original document: 2016-DC-09

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