Diagnosing the field reversed configuration plasmas on FRX-L
Abstract
FRX-L is a plasma device designed to form field-reversed-configuration (FRC) plasma of about 200eV and 10**23m**(-3) with 20 micro seconds lifetime. Many diagnostic challenges are presented in such plasma device due to its severe electromagnetic environment and very limited access space. A number of diagnostics have been developed and operated on the device. This paper provides a review on the diagnostics on FRX-L, including a multi-chord laser interferometer (633 microns He-Ne laser; 8 chords designed, 2 chords operating now) for measuring the line integrated electron density, tiny magnetic pick-up coils (B-dot probes) for measuring the magnetic fields and excluded magnetic fluxes by FRC plasmas. Diagnostic capabilities are also described, for example, Impurity lines and visible light are monitored by optical multichannel analyzer spectrometers, photodiodes and photomultipliers with optical filters, which are fed by optical fibres; Time sequential plasma pictures are taken by end-on framing camera. New and planned diagnostics are also described, which include Thomson Scattering system, bolometer, neutron detector and an X-ray framing camera.
- Publication:
-
APS Division of Plasma Physics Meeting Abstracts
- Pub Date:
- November 2002
- Bibcode:
- 2002APS..DPPBP1032Z