• DOI:10.1063/1.4894036
• Corpus ID: 24467315

Improved Collective Thomson Scattering measurements of fast ions at ASDEX upgrade

@inproceedings{Rasmussen2013ImprovedCT,
  title={Improved Collective Thomson Scattering measurements of fast ions at ASDEX upgrade},
  author={Jens Juul Rasmussen and Stefan Kragh Nielsen and M. Stejner and Mirko Salewski and A. S. Jacobsen and S{\o}ren Bang Korsholm and Frank Leipold and Fernando Meo and P. K. Michelsen and Dmitry Moseev and M. Schubert and Jorg Stober and Giovanni Tardini and Dietmar Wagner and The Asdex Upgrade Team},
  year={2013}
}

• J. Rasmussen, S. Nielsen, +12 authors The Asdex Upgrade Team
• Published 9 October 2013
• Physics

Understanding the behaviour of the confined fast ions is important in both current and future fusion experiments. These ions play a key role in heating the plasma and will be crucial for achieving conditions for burning plasma in next-step fusion devices. Microwave-based Collective Thomson Scattering (CTS) is well suited for reactor conditions and offers such an opportunity by providing measurements of the confined fast-ion distribution function resolved in space, time and 1D velocity space. We currently operate a CTS system at ASDEX Upgrade using a gyrotron which generates probing radiation at 105 GHz. A new setup using two independent receiver systems has enabled improved subtraction of the background signal, and hence the first accurate characterization of fast-ion properties. Here we review this new dual-receiver CTS setup and present results on fast-ion measurements based on the improved background characterization. These results have been obtained both with and without NBI heating, and with the meas...