
doi: 10.2172/828495
Strong magnetic field shear around the divertor x-point is numerically predicted to lead to strong spatial asymmetries in turbulence driven particle fluxes. To visualize the turbulence and associated impurity line emission near the lower x-point region, a new tangential observation port has been recently installed on NSTX. A reentrant sapphire window with a moveable in-vessel mirror images the divertor region from the center stack out to R 80 cm and views the x-point for most plasma configurations. A coherent fiber optic bundle transmits the image through a remotely selected filter to a fast camera, for example a 40500 frames/sec Photron CCD camera. A gas puffer located in the lower inboard divertor will localize the turbulence in the region near the x-point. Edge fluid and turbulent codes UEDGE and BOUT will be used to interpret impurity and deuterium emission fluctuation measurements in the divertor.
Turbulence, Mirrors, Plasma, Magnetic Fields, Sapphire, Divertors, Shear, Fluctuations, 70 Plasma Physics And Fusion Technology, Cameras, Deuterium, Fiber Optics
Turbulence, Mirrors, Plasma, Magnetic Fields, Sapphire, Divertors, Shear, Fluctuations, 70 Plasma Physics And Fusion Technology, Cameras, Deuterium, Fiber Optics
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