Vertical-viewing electron cyclotron emission diagnostic for the DIII-D tokamak

James, Reed; Janz, S.; Ellis, R.; Boyd, D.; Lohr, John
August 1988
Review of Scientific Instruments;Aug1988, Vol. 59 Issue 8, p1611
Academic Journal
The vertical-viewing electron cyclotron emission diagnostic on DIII-D will be used to assess the nonthermal electron distributions resulting from electron cyclotron heating and electron cyclotron current drive experiments. Electron cyclotron emission along a vertical chord is collected using an ellipsoidal focusing mirror and retroreflector (the latter to minimize wall reflections). The emission is then transported ∼ 20 m using a quasioptical transport system composed of eight lenses and three mirrors, and detected between the 2nd and the 10th harmonics by a fast-scanning (40-Hz) Michelson interferometer. The entire system has been aligned using a Gaussian beam simulator and absolutely calibrated in situ using a cold liquid-nitrogen bath. Details of the design, installation, and calibration will be discussed.


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