Speaker
Description
The UK Science and Technology Facilities Council (STFC) and iThemba Laboratory for Accelerator Based Sciences (LABS) have developed an optical emission diagnostic system for monitoring ion sources. A particular interest in this work is probing the stability of the plasma of an Electron Cyclotron Resonance Ion Source (ECRIS) non-invasively. The newly developed diagnostic system, based on thermoelectrically-cooled Multi-Pixel Photon Counters (MMPCs) and a CCD spectrometer, allows for the plasma to be studied in both wavelength- and time-resolved modes, monitoring several band-pass filtered emission lines simultaneously. This enables known plasma phenomena such as plasma instabilities to be studied in greater detail. Recently the emission lines of various ion species of interest were measured using the JYFL 14 GHz ECRIS. This measurement allowed identification of the filters required to probe the emission lines that are most sensitive to the plasma parameters. For example, probing the emission lines of the singlet and triplet systems of He-I (neutrals) as well as He-II (He+ ions) can reveal the effect of plasma instabilities on the cold electron population, inaccessible via electron spectroscopy or x-ray/bremsstrahlung diagnostics. This contribution describes the experimental setup and the line-ratio method, and presents some preliminary results.
Funding Agency
STFC
| Classification | MC6: Applications and diagnostics |
|---|---|
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