Design of a variable frequency comb reflectometer system for the ASDEX Upgrade tokamak

T HAPPEL; W KASPAREK; P HENNEQUIN; K HÖFLER; C HONORÉ; the ASDEX Upgrade Team

doi:10.1088/2058-6272/ab618c

Plasma Science and Technology > 2020 > 22(6): 64002-064002. > DOI: 10.1088/2058-6272/ab618c

T HAPPEL, W KASPAREK, P HENNEQUIN, K HÖFLER, C HONORÉ, the ASDEX Upgrade Team. Design of a variable frequency comb reflectometer system for the ASDEX Upgrade tokamak[J]. Plasma Science and Technology, 2020, 22(6): 64002-064002. DOI: 10.1088/2058-6272/ab618c

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Design of a variable frequency comb reflectometer system for the ASDEX Upgrade tokamak

¹ Max-Planck-Institut für Plasmaphysik, Boltzmannstr. 2, 85748 Garching, Germany
² IGVP, Universität Stuttgart, Pfaffenwaldring 31, 70569 Stuttgart, Germany
³ Laboratoire de Physique des Plasmas, CNRS, École Polytechnique, Sorbonne Université, F-91120 Palaiseau, France
⁴ Physik-Department E28, Technische Universität München, James-Franck-Str. 1, 85748 Garching, Germany

Funds: This work has been carried out within the framework of the EUROfusion Consortium and has received funding from the Euratom research and training programme 2014–2018 and 2019–2020 under grant agreement No. 633053. The views and opinions expressed herein do not necessarily reflect those of the European Commission

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Received Date: September 30, 2019
Revised Date: December 10, 2019
Accepted Date: December 11, 2019

Graphical Abstract

Abstract

Abstract

Comb reflectometers offer the advantage of measuring several radial positions in plasma simultaneously. This allows for the investigation of fast timescales during L-H transitions, I-phases, I-mode bursts, transients during heat wave propagation, etc. A drawback of many present-day systems is that they use a fixed frequency difference between the probing frequencies. Hence, although the central probing frequency can be varied, the probing frequency difference is usually fixed. The new design presented in this work uses an advanced microwave generation and detection scheme, which allows for arbitrary probing frequencies and probing frequency separations.
- reflectometry,
- microwaves,
- plasma diagnostic,
- reflectomete,
- turbulence

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Design of a variable frequency comb reflectometer system for the ASDEX Upgrade tokamak