Performance measurements of the collective Thomson scattering receiver at ASDEX Upgrade

TitlePerformance measurements of the collective Thomson scattering receiver at ASDEX Upgrade
Publication TypeJournal Article
Year of Publication2012
AuthorsV. Furtula, F. Leipold, M. Salewski, P.K Michelsen, S.B Korsholm, F. Meo, D. Moseev, S.K. Nielsen, M. Stejner, T Johansen
JournalJournal of Instrumentation
Volume7
Number02
PaginationC02039
Abstract

The fast-ion collective Thomson scattering (CTS) receiver at ASDEX Upgrade can detect spectral power densities of a few eV in the millimeter-wave range against the electron cyclotron emission (ECE) background on the order of 100 eV under presence of gyrotron stray radiation that is several orders of magnitude stronger than the signal to be detected. The receiver heterodynes the frequencies of scattered radiation (100–110 GHz) to intermediate frequencies (IF) (4.5–14.5 GHz). The IF signal is divided into 50 IF channels tightly spaced in frequency space which are terminated by square-law Schottky detector diodes. The performance of the entire receiver is determined by the main receiver components operating at mm-wave frequencies (notch-, bandpass- and lowpass filters, a voltage-controlled variable attenuator, and an isolator), a mixer, and the IF components (amplifiers, band-pass filters, and detector diodes). We discuss here the design of the entire receiver, focussing on its performance as a unit. The receiver has been disassembled, and the performance of its individual components has been characterized. Based on these individual component measurements we predict the spectral response of the receiver assembled as a unit. The measured spectral response of the assembled receiver is in reasonable agreement with this prediction.

URLhttp://stacks.iop.org/1748-0221/7/i=02/a=C02039
DOI10.1088/1748-0221/7/02/C02039
Division

FP

Department

PDG

PID

2d03c7ff17e2f23b170fab1a1905e230

Alternate TitleJINST
LabelOA

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