The first measurement of plasma density in an ECRIS-like device by means of a frequency-sweep microwave interferometer

The note presents the firstplasma densitymeasurements collected by a novelmicrowaveinterferometer in a compact Electron Cyclotron Resonance Ion Sources (ECRIS). The developed K-band (18.5 ÷ 26.5 GHz)microwaveinterferometry, based on the Frequency-Modulated Continuous-Wave method, has been able to discriminate theplasma signal from the spurious components due to the reflections at theplasma chamber walls, when working in the extreme unfavorable conditionλp≃Lp≃Lc (λp,Lp, andLc being the probing signal wavelength, theplasma dimension and theplasma chamber length, respectively). The note describes the experimental procedure when probing a high densityplasma (ne> 1 ⋅ 1018 cm−3) produced by an ECRIS prototype operating at 3.75 GHz.

Source: Review of Scientific Instruments - September 29, 2016 Category: Physics Authors: D. Mascali, G. Torrisi, O. Leonardi, G. Sorbello, G. Castro, L. G. Celona, R. Miracoli, R. Agnello and S. Gammino Source Type: research