P4.086 X-mode raw data analysis of the new AUG ICRF antenna

29th Symposium on Fusion Technology (SOFT 2016)
Contribution ID :
50214
Type :
Poster
P4.086 X-mode raw data analysis of the new AUG
ICRF antenna edge density prole reectometer
Thursday, 8 September 2016 14:20 (1:40)
Content
The new multichannel X-mode reflectometer installed on ASDEX Upgrade measures the plasma
density profile evolution at different positions in front of the ICRF antenna. The reflectometer
operates in the extended U-band (40–68 GHz) microwave region, measuring density profiles up
to 101919 m-3-3 with magnetic fields between 1.5 T and 2.7 T. In this heterodyne reflectometer
architecture, the signal reflected by the plasma is downshifted to a lower intermediate frequency,
amplified and filtered with a 100 MHz bandpass filter. Quadrature detectors demodulate the
in-phase and quadrature (IQ) signals, which are acquired at 200 MS/s. In this work we analyse the
acquired IQ signals from the different reflectometer antennas, and describe the waveguide dispersion
calibration and filtering of the raw signal. The effect of spurious reflections, such as the multiple
reflections from the ICRF antenna metal straps, are analyzed and taken into account on the data
processing software. The amplitude and phase characteristics of the signal with plasma reflection are
used to determine the first fringe of the upper X-mode cutoff and calculate the group delay used for
the density profile inversion. In some high plasma density and high magnetic field scenarios, both
the lower and upper X-mode cutoff frequencies are detected in the single U-band. An algorithm to
distinguish both cutoff regions is presented, enabling the use of the lower cutoff group delay for the
future implementation of the core density profile inversion.
Co-author(s) : AGUIAM, Diogo Eloi (Instituto de Plasmas e Fusão Nuclear, Instituto Superior
Técnico, Universidade de Lisboa, 1049-001 Lisboa, Portugal); SILVA, Antonio (Instituto de Plasmas e
Fusão Nuclear, Instituto Superior Técnico, Universidade de Lisboa, 1049-001 Lisboa, Portugal); CARVALHO, Pedro J. (Instituto de Plasmas e Fusão Nuclear, Instituto Superior Técnico, Universidade de
Lisboa, 1049-001 Lisboa, Portugal); CARVALHO, Paulo F. (Instituto de Plasmas e Fusão Nuclear,
Instituto Superior Técnico, Universidade de Lisboa, 1049-001 Lisboa, Portugal); CAVAZZANA, Roberto
(Consorzio RFX (CNR, ENEA, INFN, Universita’ di Padova, Acciaierie Venete SpA), Corso Stati Uniti 4,
35127 – Padova, Italy); CONWAY, Garrard D. (Max-Planck-Institut fu¨r Plasmaphysik, Boltzmannstr.
2, D-85748 Garching, Germany); D’ARCANGELO, Ocleto (Dipartimento FSN, ENEA, C. R. Frascati,
via E. Fermi 45, 00044 Frascati (Roma), Italy); FATTORINI, Luca (Dipartimento di Fisica, Universitá
degli Studi Milano Bicocca, Piazza della Scienza 3, 20126 Milano, Italy); FAUGEL, Helmut (Max–
Planck-Institut fu¨r Plasmaphysik, Boltzmannstr. 2, D-85748 Garching, Germany); FERNANDES, Ana
(Instituto de Plasmas e Fusão Nuclear, Instituto Superior Técnico, Universidade de Lisboa, 1049-001
Lisboa, Portugal); FUNFGELDER, Helmut (Max-Planck-Institut fu¨r Plasmaphysik, Boltzmannstr. 2,
D-85748 Garching, Germany); GONCALVES, Bruno (Instituto de Plasmas e Fusão Nuclear, Instituto
Superior Técnico, Universidade de Lisboa, 1049-001 Lisboa, Portugal); GUIMARAIS, Luis (Instituto
de Plasmas e Fusão Nuclear, Instituto Superior Técnico, Universidade de Lisboa, 1049-001 Lisboa,
Portugal); DE MASI, Gianluca (Consorzio RFX (CNR, ENEA, INFN, Universita’ di Padova, Acciaierie
Venete SpA), Corso Stati Uniti 4, 35127 – Padova, Italy); MENESES, Luis (Instituto de Plasmas e
Fusão Nuclear, Instituto Superior Técnico, Universidade de Lisboa, 1049-001 Lisboa, Portugal); NOTERDAEME, Jean-Marie (Max-Planck-Institut fu¨r Plasmaphysik, Boltzmannstr. 2, D-85748 Garching,
Germany;Applied Physics Department, Ghent University, B-9000 Gent, Belgium); PEREIRA, Rita C.
(Instituto de Plasmas e Fusão Nuclear, Instituto Superior Técnico, Universidade de Lisboa, 1049-001
Lisboa, Portugal); ROCCHI, Giuliano (Dipartimento FSN, ENEA, C. R. Frascati, via E. Fermi 45, 00044
Frascati (Roma), Italy); SANTOS, Jorge (Instituto de Plasmas e Fusão Nuclear, Instituto Superior
Técnico, Universidade de Lisboa, 1049-001 Lisboa, Portugal); TUCCILLO, Angelo A. (Dipartimento FSN,
ENEA, C. R. Frascati, via E. Fermi 45, 00044 Frascati (Roma), Italy); TUDISCO, Onofrio (Dipartimento
FSN, ENEA, C. R. Frascati, via E. Fermi 45, 00044 Frascati (Roma), Italy); TEAM, ASDEX Upgrade
(Max-Planck-Institut fu¨r Plasmaphysik, Boltzmannstr. 2, D-85748 Garching, Germany)
Presenter(s) : AGUIAM, Diogo Eloi (Instituto de Plasmas e Fusão Nuclear)
Session Classication : P4 Poster session
Track Classication : D. Diagnostics, Data Acquisition and Remote Participation