Scientists and engineers at PPFE, DTU Physics, are participating in the worldwide effort to design and construct the largest international research project in the World, ITER – the first experiment to demonstrate the feasibility of fusion energy as a sustainable energy source for the future.

Since February 2014, DTU (in a consortium with Instituto Superior Técnico (IST, Portugal)) has had a multi-year Framework Partnership Agreement (FPA) with Fusion for Energy (F4E) for the development of the Collective Thomson Scattering (CTS) diagnostic for ITER (see article PPFE wins large contract with ITER).The overall aim of the FPA is to analyze, develop, design, qualify, and ultimately provide the final design of the in-vessel components of the CTS diagnostic to F4E. Additionally, DTU should provide the functional specifications of all the remaining parts of the diagnostic system in order for this to be designed and installed for the first plasma of ITER (now foreseen in 2025). In May 2018, DTU signed the fifth (and last) cascading contract with a volume corresponding to an effort of 15 man years over the coming 2.5 years (see article DTU PPFE wins a large contract with Fusion for Energy).


The design teams at DTU and IST provided system design, performance analysis, engineering analysis etc. at a level that satisfied the expert panel of the Intermediate Design Review in June 2017. Currently, the design teams are preparing for the Preliminary Design Phase and the associated design review scheduled for the second quarter of 2019. The processes include further detailing of the design and manufacturing routes for critical components, as well as performance analysis, engineering and neutronics analysis, and prototype testing. The figures below show CAD drawings of the present system design as well as a photograph of the prototype testing setup.


When ITER will enter the full burn D+T-fusion phases the CTS system will be the key diagnostic for the physicists to explore the behavior and dynamics of the fusion born fast alpha particles. PPFE scientists hope to maintain the stronghold in exploitation of the CTS diagnostic by this participation in the World’s leading machine – ITER.


During the years 2003-2007, the CTS group at DTU developed a conceptual and preliminary design for a CTS diagnostic system for ITER under contracts with EFDA. This work laid the foundation for the inclusion of a CTS diagnostic system in the ITER Baseline Design which was updated in 2007. The CTS diagnostic will have the primary objective to diagnose fast ion behavior across the plasma radius in ITER. 

CTS details

prototype test



Søren Bang Korsholm
Senior Scientist
DTU Physics
+45 20 64 55 61