Neutron rates and fast-ion transport in ASDEX Upgrade fusion plasmas




Greater Copenhagen area

In a nuclear fusion plasma, neutrons are produced in fusion reactions between energetic plasma ions. Recently, a systematic deficit of such neutrons has been reported at the JET and MAST fusion devices when compared to theoretical simulations based on plasma transport codes. This could potentially be related to an as yet unidentified mechanism of fast-ion transport in the plasma. Such a mechanism could redistribute energetic ions from the plasma core, thus lowering the overall fusion and neutron production rates in the plasma. This could have wide-ranging consequences for future fusion devices, so it is important to understand the origin and generality of this result.

The goal of this project is to establish whether such a neutron “deficit” is also present in the ASDEX Upgrade fusion device, and if so under which conditions. The student will extract measured neutron rates for various ASDEX plasmas under a range of operating conditions and in the presence/absence of various plasma instabilities that could affect fast-ion transport. The rates will be compared to theoretical predictions using the TRANSP code, and the conditions under which significant discrepancies might occur should be assessed. Finally, possible explanations for any neutron deficit should be evaluated, assisted by measurements from other diagnostics.


Experience with Matlab or equivalent and an interest in data analysis and modelling techniques. Some knowledge of fusion plasma physics will be advantageous.

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Company / Organization

DTU Fysik


Jesper Rasmussen




Supervisor info

MSc in Physics and Nanotechnology


Jesper Rasmussen


Stefan Kragh Nielsen

ECTS credits

15 - 30


BSc project, MSc thesis

Technical University of Denmark

For almost two centuries DTU, Technical University of Denmark, has been dedicated to fulfilling the vision of H.C. Ørsted – the father of electromagnetism – who founded the university in 1829 to develop and create value using the natural sciences and the technical sciences to benefit society.

Today, DTU is ranked as one of the foremost technical universities in Europe, continues to set new records in the number of publications, and persistently increases and develops our partnerships with industry, and assignments accomplished by DTU’s public sector consultancy.

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