| Title |
Impact of the Two Close Frequency Heating on ECRIS Plasmas Stability |
| Authors |
- E. Naselli, C. Caliri, G. Castro, L. Celona, S. Gammino, D. Mascali, M. Mazzaglia, F.P. Romano, G. Torrisi
INFN/LNS, Catania, Italy
- S. Biri, Z. Perduk, R. Rácz
ATOMKI, Debrecen, Hungary
- A. Galatà
INFN/LNL, Legnaro (PD), Italy
- E. Naselli
Catania University, Catania, Italy
- J. Pálinkás
DU, Debrecen, Hungary
- F.P. Romano
IBAM-CNR, Catania, Italy
|
| Abstract |
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.
|
| Paper |
download FRB2.PDF [1.817 MB / 5 pages] |
| Export |
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| Conference |
ECRIS2018, Catania, Italy |
| Series |
International Workshop on ECR Ion Sources (23rd) |
| Proceedings |
Link to full ECRIS2018 Proccedings |
| Session |
Plasma Investigations |
| Date |
14-Sep-18 11:10–12:00 |
| Main Classification |
Plasma physics and techniques |
| Keywords |
plasma, ECR, experiment, ECRIS, klystron |
| Publisher |
JACoW Publishing, Geneva, Switzerland |
| Editors |
Volker RW Schaa (GSI, Darmstadt, Germany); Pietro Pisciotta (SINFN - Laboratori Nazionali del Sud, Catania, Italy) |
| ISBN |
978-3-95450-196-0 |
| Published |
January 2019 |
| Copyright |
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