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TY - CONF AU - Naselli, E. AU - Biri, S. AU - Caliri, C. AU - Castro, G. AU - Celona, L. AU - GalatÃ , A. AU - Gammino, S. AU - Mascali, D. AU - Mazzaglia, M. AU - Perduk, Z. AU - Pálinkás, J. AU - Romano, F.P. AU - RÃ¡cz, R. AU - Torrisi, G. ED - Schaa, Volker RW ED - Pisciotta, Pietro TI - Impact of the Two Close Frequency Heating on ECRIS Plasmas Stability J2 - Proc. of ECRIS2018, Catania, Italy, 10-14 September 2018 C1 - Catania, Italy T2 - International Workshop on ECR Ion Sources T3 - 23 LA - english AB - Several experiments have recently demonstrated that plasma instabilities are powerful limiting factors to the flux of highly charged ion beam extracted from ECRIS. One of the methods for damping the instabilities is to feed the plasma in two frequency heating mode. Since the fundamental physical mechanism is still unclear (diffusion in velocity space? additional confinement?), a deeper experimental investigation is necessary, using multi-diagnostics setups. At ATOMKI-Debrecen the effect on the plasma instabilities of an argon plasma in a 'Two Close Frequencies' scheme has been explored. Spectra of radio-emission from the plasma have been collected for different frequency gaps and relative power balances. The measurements show the plasma self-emitted radiation comes out from the internal plasma (i.e. around the lower frequency) but the instability damping can be effective for some specific combinations of frequency-gap and power balance. Radiofrequency spectra have been collected simultaneously to time-resolved X-ray measurements, triggered by RF bursts produced by the instabilities and detected via a microwave diode connected to a plasma-chamber-immersed multi-pin RF probe. PB - JACoW Publishing CP - Geneva, Switzerland SP - 214 EP - 218 KW - plasma KW - ECR KW - experiment KW - ECRIS KW - klystron DA - 2019/01 PY - 2019 SN - 978-3-95450-196-0 DO - 10.18429/JACoW-ECRIS2018-FRB2 UR - http://jacow.org/ecris2018/papers/frb2.pdf ER -