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Innovations in optical coupling of the KSTAR electron cyclotron emission imaging diagnostica)
a)Contributed paper, published as part of the Proceedings of the 18th Topical Conference on High-Temperature Plasma Diagnostics, Wildwood, New Jersey, May 2010.
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View: Figures


Image of FIG. 1.
FIG. 1.

KSTAR ECEI optical system schematic (top) and the CAD drawing of the port H with adaptor and cassette inserted (bottom). The high-density polyethylene (HDPE) lenses are mounted on translation stages inside the cassette.

Image of FIG. 2.
FIG. 2.

A CAD drawing of the complete KSTAR ECEI optical arrangement.

Image of FIG. 3.
FIG. 3.

Geometrical ray tracing results of representative rays for the center and marginal LFS detector channels illustrates the focusing movement and vertical zoom capability. The front focusing lens is moved forward to focus at the outboard/LFS position (top) and is retracted to focus at inboard/HFS position (middle). The system is in wide zoom, while the central negative zoom lens is nearest to the plasma (bottom).

Image of FIG. 4.
FIG. 4.

Gaussian beam tracing is represented for three positions of the KSTAR ECEI optics (mirrors and beamsplitters are not shown). In the narrow zoom position, the high field side (a) and low field side (b) focusing is demonstrated. In wide zoom (c), confocal lengths are increased such that the entire extent of the plasma may be considered in focus.

Image of FIG. 5.
FIG. 5.

The BPM analysis of beam energy after passing through system apertures. The energy distributions of the image spot in narrow, and wide zoom positions are displayed. Spot size scales with a zoom ratio of 3:1 vertically and is constant in the toroidal direction. Imaged captured at the focal position of the high field side array at 110 GHz.

Image of FIG. 6.
FIG. 6.

The intensity scan at the image plane of the HFS optics in wide zoom (1:3) position. The source works at 120 GHz and is placed at eight different vertical positions in the object plane.


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Scitation: Innovations in optical coupling of the KSTAR electron cyclotron emission imaging diagnostica)