Design, laboratory characterization and installation of the multichannel reflectometer's transmission lines at ICRF antenna in Asdex Upgrade

O. D'Arcangelo, O. Tudisco, S. Ceccuzzi, H. Füenfgelder, G. Rocchi, G.D. Conway, G. De Masi, L. Fattorini, J. Friesen, L. Meneses, G. Siegl, A. Silva, J.M. Noterdaeme, A. Simonetto, A.A. Tuccillo, T. Vierle, I. Zammuto

Research output: Contribution to conferencePaper

Abstract

In order to improve the coupling of the RF power injected to heat the plasma, a detailed knowledge of the plasma density profile in front of the launching antennas is essential. Reflectometry is one of the best candidates to achieve this since it is a non-invasive method, requiring only a limited access space to the plasma, while guaranteeing a very good spatial and temporal resolution. A new multichannel reflectometer is installed inside one of the new ICRF antenna at ASDEX Upgrade (AUG): it consists of three channels that can be switched between 10 antenna pairs with different lines-of-sight (accesses) to the plasma, working in the frequency range 40-68 GHz, using the upper (right-hand) X mode cut-off, with a frequency scan in 10 ms, every 15 ms. The transmission system is composed of standard WR19 waveguides in fundamental mode, and includes DC breaks and low pass filters to reject frequencies of the ECRH systems. WR19 rectangular horns and truncated WR42 waveguide have been used as antennas. All in-vessel components have been tested by pre-installation on a spare Vacuum Vessel Octant and are now fully assembled and tested in AUG. Reflection and transmission coefficient, as well as the coupling between the antennas, have been measured. The results of this measurements, their comparison with the simulations of a full wave code and an estimation of the power level expected at the receiver are reported in this paper.
Original languageEnglish
Publication statusPublished - 2015
Externally publishedYes
Event1st EPS Conference on Plasma Diagnostics, ECPD 2015 - Frascati, Italy
Duration: 1 Jan 2015 → …

Conference

Conference1st EPS Conference on Plasma Diagnostics, ECPD 2015
CountryItaly
CityFrascati
Period1/1/15 → …

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All Science Journal Classification (ASJC) codes

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Cite this

D'Arcangelo, O., Tudisco, O., Ceccuzzi, S., Füenfgelder, H., Rocchi, G., Conway, G. D., ... Zammuto, I. (2015). Design, laboratory characterization and installation of the multichannel reflectometer's transmission lines at ICRF antenna in Asdex Upgrade. Paper presented at 1st EPS Conference on Plasma Diagnostics, ECPD 2015, Frascati, Italy.