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- W4200243372 abstract "Direct imaging from fast visible cameras can provide intuitive information for the detailed dynamics of a fusion plasma. Images with different toroidal positions help our understanding of the 3D structure of the plasma phenomena. Fast-Visible camera (FVC) system was installed in KSTAR to investigate the assimilation process during plasma disruptions induced by Shattered Pellet Injections (SPIs). Since these events are highly non-axisymmetric and good toroidal coverage and high spatial and temporal resolution is required, the field of view of each camera is oriented towards the injection tube of each of the two SPIs, which are located toroidally opposite to each other. To investigate fragment penetration and ablation using images from a FVC, all components of the system should be able to support a fast frame rate due to the speed of shattered fragments of several hundreds of meter per second. The KSTAR FVC system typically uses a complementary metal-oxide-semiconductor (CMOS) with 10,000 frame per second at a resolution of 832 × 600 pixel typically for SPI experiments and its maximum frame rate is up to 600,000 frames per second with 64 × 8 pixels resolution. A hybrid optical system that consists of 2.04 m long relay optics mounted in the viewport cassette and a 4.5 m long imaging fiber bundle secures sufficient distance to reduce the harmful effects on the sensitive fast camera from radiation, neutron impact, and strong magnetic field. This paper reports the installation of the FVC system on KSTAR is introduced and semi three-dimensional observations of disruption mitigation processes during SPIs." @default.
- W4200243372 created "2021-12-31" @default.
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- W4200243372 date "2022-01-01" @default.
- W4200243372 modified "2023-09-27" @default.
- W4200243372 title "Fast visible camera diagnostic for dual shattered pellet injections at KSTAR" @default.
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- W4200243372 doi "https://doi.org/10.1016/j.fusengdes.2021.112984" @default.
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