2D image of the plasma emission mostly originated from neutral ionization (656.3nm) in the edge are measured with very fast sampling TV camera + Image-Intensifier system.
Studies of edge and SOL turbulence transport, and ELM propagation to the wall are progressed by fast & fine resolution improved.
Fine-resolution image of the plasma edge will be used for steady-state transport study in edge and SOL.
Plasma turbulence by gas-jet injection (P15 inner & outer wall) will be observed.
Fast TV system is supported by Grant-in-Aid for Scientific Research, Japan Society for the Promotion of Science.
|TV camera :||Photron High-speed Digital Video Camera: FASTCAM-MAX-II(with Image Intensifier)|
|Image guide and Scope:||One of two scopes (viewing angles of 5 and 10 degrees) is coupled on Diaguide-scope (High resolution 30,000fibers-type, 15m length, Mitsubishi Cable Industries).|
|Time resolution, Sampling period, Signal resolution:|
|Operation:||Start trigger, frame clock, and gate pulse(if required) are preprogrammed in CAMAC clock system, using Network Crate-Controller and PC.
TV camera control and data acquisition are operated with PCI-camera link via optical fibers.
|Typ.. resolutions:||(1) Max. speed,||8 micro-s/fr for 26s (128 x 16 resolution)|
|(2)||10 micro-s/fr for 15s (128 x 32 resolution)|
|(3)||20 micro-s/fr for 7.8s (128 x 64 resolution)|
|(4)||100 micro-s/fr for 4.9s (512 x 256 resolution)|
|(5)||500 micro-s/fr for 3s (1024x1024 resolution)|
|Note) min. gate width is 4 micro-s|
|Expected spatial resolution:||3 mm (wide view scope: max. 32cm at 250cm),
1.5 mm (narrow view scope: max. 16cm at 250cm)
|Position :||P-17 section, midplane tangential port (Z=+17cm),
focusing on the plasma edge and SOL at P15 midplane.