Electromagnetic diagnostics of ECR-Ion Sources plasmas: optical/X-ray imaging and spectroscopy

• Published in: Journal of instrumentation Vol. 12; no. 12; p. C12047
• Main Authors: Mascali, D., Castro, G., Altana, C., Caliri, C., Mazzaglia, M., Romano, F.P., Leone, F., Musumarra, A., Naselli, E., Reitano, R., Torrisi, G., Celona, L., Cosentino, L.G., Giarrusso, M., Gammino, S.
• Format: Journal Article
• Language: English
• Published: Bristol IOP Publishing 22.12.2017
• Subjects: Cyclotron resonance; Domains; Electron cyclotron resonance; Energy resolution; Fluid flow; Ion sources; Magnetohydrodynamics; Microwaves; Plasma; Plasma density; Plasmas (physics); Spatial resolution; Spectrum analysis; X ray imagery; X-ray spectroscopy
• ISSN: 1748-0221; 1748-0221
• DOI: 10.1088/1748-0221/12/12/C12047

Magnetoplasmas in ECR-Ion Sources are excited from gaseous elements or vapours by microwaves in the range 2.45–28 GHz via Electron Cyclotron Resonance. A B-minimum, magnetohydrodynamic stable configuration is used for trapping the plasma. The values of plasma density, temperature and confinement times are typically ne=1011−1013 cm−3, 01eV<Te<10 keV, 0.001<tc<1 s. At INFN-LNS several diagnostics tools have been developed for probing the electromagnetic emission of such plasmas, in the optical/X-ray domain. Fast Silicon Drift detectors with high energy resolution of 125 eV at 5.9 keV have been used for the characterization of plasma emission at 02<E<3 keV . In the domain 0.4–17 keV an X-ray pin-hole camera technique has allowed space resolved X-ray spectroscopy with a spatial resolution down to 30 μm and an energy resolution down to 140 eV at 5.9 keV . In parallel, imaging in the optical range and spectroscopic measurements have been carried out. Relative abundances of H/H2 atoms/molecules in the plasmas have been measured for different values of neutral pressure, microwave power and magnetic field profile (they are critical for high-power proton sources).