2017
DOI: 10.1063/1.4993131
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Extensions to the charge exchange recombination spectroscopy diagnostic suite at ASDEX Upgrade

Abstract: Extension of the core CXRS in AUGA new core charge exchange recombination spectroscopy (CXRS) diagnostic has been installed in the ASDEX Upgrade tokamak that is capable of measuring the impurity ion temperature, toroidal rotation, and density on both the low field side (LFS) and high field side (HFS) of the plasma. The new system features 48 lines-of-sight (LOS) with a radial resolution that varies from ±2cm on the LFS down to ±0.75cm on the HFS and has sufficient signal to run routinely at 10ms and for specia… Show more

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Cited by 47 publications
(63 citation statements)
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“…In order to provide robust and reliable measurements of these essential quantities at high resolution, much of the W7-X CXRS was broadly based on the CXRS system of the ASDEX-Upgrade tokamak 15,18 which has similar plasma minor radius, temperatures and densities and almost identical NBI sources. Significant differences are the larger carbon and oxygen impurity concentrations in W7-X due to the large surface area of carbon first-wall and divertor and the higher Bremsstrahlung background level due to plasma densities up to 2 × 10 20 m −3 .…”
Section: Diagnostic Hardwarementioning
confidence: 99%
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“…In order to provide robust and reliable measurements of these essential quantities at high resolution, much of the W7-X CXRS was broadly based on the CXRS system of the ASDEX-Upgrade tokamak 15,18 which has similar plasma minor radius, temperatures and densities and almost identical NBI sources. Significant differences are the larger carbon and oxygen impurity concentrations in W7-X due to the large surface area of carbon first-wall and divertor and the higher Bremsstrahlung background level due to plasma densities up to 2 × 10 20 m −3 .…”
Section: Diagnostic Hardwarementioning
confidence: 99%
“…In the latter half of the second experimental phase (OP1.2b), two 1.5MW positive-ion neutral beam injection (NBI) sources were commissioned 11 . This opened the possibility of making local measurements at high spatial and temporal resolution using active beam spectroscopy, comprised of Charge Exchange Recombination Spectroscopy (CXRS) [12][13][14][15] and Beam Emission Spectroscopy (BES) 16 . The improved ability to measure the temperature profiles comes as the NBI increases the importance of the ion heat transport channel compared to the first campaigns, where the electron-channel domia) Corresponding author.…”
Section: Introductionmentioning
confidence: 99%
“…To guarantee a good disentanglement of the rigid body rotation from the component parallel to the magnetic field, the radial distance between the two points on the same flux surface should be large. Therefore, the upgrades to the core CXRS system at AUG [28] were designed to enable measurements on the low-field side (LFS,…”
Section: Measurement Techniquementioning
confidence: 99%
“…An absolute calibration of the spectrometer allows for a direct comparison with other spectrometers installed at ASDEX Upgrade. Figure 9 shows the calibration conversion factors of the new edge FIDA spectrometer compared to those of a core (COR) CXRS spectrometer 25 . Here the applied gain factors have been adjusted for and the difference in slit width between the two spectrometers taken into account.…”
Section: Calibrationmentioning
confidence: 99%
“…CAMERA READOUT MODESTwo different readout options of the camera are used here. First, the frame-transfer mode, typically applied by the suite of CXRS systems25 at ASDEX Upgrade allows for continuous imaging. The EM-CCD chip has an additional region of 1024×1037 pixels that are covered and not illuminated, as illustrated in figure 8.…”
mentioning
confidence: 99%