TY - JOUR
T1 - Fluctuation BES measurements with the ITER core CXRS prototype spectrometer
AU - Pokol, G.I.
AU - Zoletnik, S.
AU - Dunai, D.
AU - Marchuk, O.
AU - Baross, T. (Teteny)
AU - Erdei, G.
AU - Grunda, G.
AU - Kiss, I.G.
AU - Kovacsik, A.
AU - Hellermann, von, M.G.
AU - Lischtschenko, O.
AU - Biel, W.
AU - Jaspers, R.J.E.
AU - Durkut, M.
PY - 2013
Y1 - 2013
N2 - The ITER core CXRS diagnostic system collects the light emitted from the interaction of the diagnostic neutral beam with the core plasma and guides it via a mirror labyrinth through the upper port plug #3 towards a fiber bundle, which then transmits the light into a set of spectrometers for spectral analysis. In order to test the accessibility of the special parameter range required for the ITER measurement, a prototype spectrometer was built and operated successfully at the TEXTOR tokamak. In addition to the He/Be, C/Ne and H/D/T regular spectral channels, a fluctuation beam emission spectroscopy (BES) system has been integrated to measure core MHD activity, and validate corresponding ITER simulation results. The fluctuation system can be operated as an alternative to the spectral BES measurement, and has 8 spatial channels sampled at 2 MHz. In this paper, we present details of the fluctuation BES system and its interface to the ITER prototype spectrometer along with simulation and measurement results at TEXTOR. We show that the measurement fully confirms the simulation results on achievable photon current at the detector and on the signal to noise ratio.
Keywords ITER; MHD; CXRS; Fluctuation; Beam emission; TEXTOR; Validation
AB - The ITER core CXRS diagnostic system collects the light emitted from the interaction of the diagnostic neutral beam with the core plasma and guides it via a mirror labyrinth through the upper port plug #3 towards a fiber bundle, which then transmits the light into a set of spectrometers for spectral analysis. In order to test the accessibility of the special parameter range required for the ITER measurement, a prototype spectrometer was built and operated successfully at the TEXTOR tokamak. In addition to the He/Be, C/Ne and H/D/T regular spectral channels, a fluctuation beam emission spectroscopy (BES) system has been integrated to measure core MHD activity, and validate corresponding ITER simulation results. The fluctuation system can be operated as an alternative to the spectral BES measurement, and has 8 spatial channels sampled at 2 MHz. In this paper, we present details of the fluctuation BES system and its interface to the ITER prototype spectrometer along with simulation and measurement results at TEXTOR. We show that the measurement fully confirms the simulation results on achievable photon current at the detector and on the signal to noise ratio.
Keywords ITER; MHD; CXRS; Fluctuation; Beam emission; TEXTOR; Validation
U2 - 10.1016/j.fusengdes.2013.02.171
DO - 10.1016/j.fusengdes.2013.02.171
M3 - Article
SN - 0920-3796
VL - 88
SP - 1386
EP - 1389
JO - Fusion Engineering and Design
JF - Fusion Engineering and Design
IS - 6-8
ER -