Silburn, “ A Doppler coherence imaging diagnostic for the mega-amp spherical tokamak,” Ph.D. Sunn Pedersen, and W7-X Team, “ Infrared imaging systems for wall protection in the W7-X stellarator (invited),” Rev. Zoletnik, and W7-X Team, “ Characterization of edge filamentary structures in the 3D geometry of Wendelstein 7-X limiter plasmas,” in 44th EPS Conference on Plasma Physics, 2017. Zoletnik, “ Overview video diagnostics for the W7-X stellarator,” Fusion Eng. Trimino Mora, and W7-X Team, “ Final integration, commissioning and start of the Wendelstein 7-X stellarator operation,” Nucl. Sunn Pedersen, and W7-X Team, “ Direct measurements of counter-streaming flows in a low-shear stellarator magnetic island topology,” Nucl. Ennis, “ A new calibration implementation for Doppler Coherence Imaging Spectroscopy,” Fusion Eng. Howard, “ Laser calibration of the DIII-D coherence imaging system,” Rev. Sunn Pedersen, and W7-X Team, “ Coherence imaging spectroscopy systems on Wendelstein 7-X for studies of island divertor plasma behavior,” in 44th EPS Conference on Plasma Physics, 2017. Wolf, ASDEX Upgrade Team, W7-X Team, and Eurofusion MST1 Team, “ Doppler coherence imaging of divertor and SOL flows in ASDEX upgrade and Wendelstein 7-X,” Plasma Phys. Howard, “ Verification of Doppler coherence imaging for 2D ion velocity measurements on DIII-D,” Rev. Howard, “ 2D imaging of helium ion velocity in the DIII-D divertor,” Phys. Boivin, “ Coherence imaging of flows in the DIII-D divertor,” Contrib. Sharples, “ Coherence imaging of scrape-off-layer and divertor impurity flows in the Mega Amp Spherical Tokamak (invited),” Rev. Boivin, “ Doppler coherence imaging and tomography of flows in tokamak plasmas (invited),” Rev. Danielsson, “ Time-resolved two-dimensional plasma spectroscopy using coherence-imaging techniques,” Plasma Phys. Howard, “ Coherence imaging spectro-polarimetry for magnetic fusion diagnostics,” J. Howard, “ Novel scanning interferometer for two-dimensional plasma density measurements,” Rev. Energy 12, 1043– 1048 (2017) ( Proceedings of the 22nd International Conference on Plasma Surface Interactions 2016, 22nd PSI). Goto, “ 2D distribution of hydrogen/impurity radiation and flow formation in stochastic layer during detachment transition in LHD,” Nucl. Motojima, and LHD Experiment Group, “ Transport characteristics in the stochastic magnetic boundary of LHD: Magnetic field topology and its impact on divertor physics and impurity transport,” Fusion Sci. Wukitch, and Alcator Group, “ Transport-driven scrape-off-layer flows and the boundary conditions imposed at the magnetic separatrix in a tokamak plasma,” Nucl. Porter, “ Carbon flows in attached divertor plasmas,” Phys. Measured velocities on the order of ∼20–30 km/s were observed, corroborated by comparisons with measurements with Mach probes. The CIS diagnostic was operational throughout the last W7-X experimental campaign. These features opened up new investigation possibilities on temperature stability and wavelength response of the CIS components, allowing to fully characterize and validate the W7-X systems. A specific prototype model was successfully adapted to the challenging requirements of W7-X, granting high accuracy (☐.01 pm) and flexibility (spectral range: 450–650 nm) in the wavelength calibration required for measuring low-Z impurity ion flow velocities. A new level of precision and stability has been achieved for the two CIS systems installed at W7-X with the use of a new calibration source, a continuous tunable laser commercially available only since 2015. However, a highly precise and stable calibration method is required for a reliable diagnostic operation. Its 2D spatially resolved measurement capabilities and its high optical throughput are ideal for investigating the impurity behavior in the complex 3D magnetic island topology edge of Wendelstein 7-X (W7-X). In the last decade, Coherence Imaging Spectroscopy (CIS) has shown distinctive results in measuring ion flow velocities in the edge of magnetically confined plasma devices.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |