Extensions to the charge exchange recombination spectroscopy diagnostic suite at ASDEX Upgrade
Open Access
- 1 July 2017
- journal article
- research article
- Published by AIP Publishing in Review of Scientific Instruments
- Vol. 88 (7), 073508
- https://doi.org/10.1063/1.4993131
Abstract
A new core charge exchange recombination spectroscopy 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 2 cm on the LFS down to 0.75 cm on the HFS and has sufficient signal to run routinely at 10 ms and for special circumstances down to 2.5 ms integration time. The LFS-HFS ion temperature profiles provide an additional constraint on the magnetic equilibrium reconstruction, and the toroidal rotation frequency profiles are of sufficiently high quality that information on the poloidal velocity can be extracted from the LFS-HFS asymmetry. The diagnostic LOS are coupled to two flexible-wavelength spectrometers such that complete LFS-HFS profiles from two separate impurities can be imaged simultaneously, albeit with reduced radial coverage. More frequently, the systems measure the same impurity providing very detailed information on the chosen species. Care has been taken to calibrate the systems as accurately as possible and to include in the data analysis any effects that could lead to spurious temperatures or rotations.
Keywords
Funding Information
- Helmholtz-Gemeinschaft
- FP7 Fusion Energy Research (633053)
This publication has 9 references indexed in Scilit:
- A method for determining poloidal rotation from poloidal asymmetry in toroidal rotation (invited)Review of Scientific Instruments, 2014
- Indirect measurement of poloidal rotation using inboard–outboard asymmetry of toroidal rotation and comparison with neoclassical predictionsNuclear Fusion, 2013
- High-resolution charge exchange measurements at ASDEX UpgradeReview of Scientific Instruments, 2012
- Exploiting a transmission grating spectrometerReview of Scientific Instruments, 2004
- New understanding of poloidal rotation measurements in a Tokamak plasmaAIP Conference Proceedings, 2000
- Analytical approximation of cross-section effects on charge exchange spectra observed in hot fusion plasmasPlasma Physics and Controlled Fusion, 1995
- An overview of charge-exchange spectroscopy as a plasma diagnosticPlasma Physics and Controlled Fusion, 1994
- Determination of plasma-ion velocity distribution via charge-exchange recombination spectroscopyPhysical Review A, 1984
- Plasma rotation in the PDX tokamakNuclear Fusion, 1983