Speaker
Description
Non-interceptive online diagnostics are essential for monitoring ion sources, particularly during physics experiments. Optical emission spectroscopy, already used in other laboratories, has been deployed at GANIL. The light emitted by the plasma is captured by a CCD camera placed behind a glass window aligned with the ion source and by an optical fiber connected to an optical spectrometer (350-1000 nm).
Initial tests were carried out with Ar + He plasma, with an intensity of 80 μAe of 40Ar⁹⁺ measured after the mass separator [1]. Additional studies were performed online in 2025 and 2026 with several ion beams. Optical measurements made it possible to track changes in the light intensity of the identified wavelengths over time. The use of this technique also provided access to new information (effect of temperature variation, presence of pollution, evaluation of the metal ion population) and helped to better identify the needs for optimizing the source settings.
These various measures demonstrate the value of developing a dedicated diagnostic tool to continuously monitor beam stability and assist operators during experiments. To this end, initial work has been carried out on automating the analysis of measured optical spectra. This represents the first step towards ultimately achieving complete automation of source adjustments.
[1] Dubois M., Lemagnen F., Gouleuf L., Metayer V., Osmond B., GANIL ion sources: optimisation for operation, Proceeding of ECRIS Workshop (2024)
| Classification | MC6: Applications and diagnostics |
|---|---|
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