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TUP12 |
Results of the Optical Emission Spectroscopy diagnostics of the ESS proton source |
107 |
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- G. Castro, L. Celona, S. Gammino, O. Leonardi, D. Mascali, M. Mazzaglia, A. Miraglia, E. Naselli, L. Neri, R. Reitano, G. Torrisi
INFN/LNS, Catania, Italy
- E. Naselli
Catania University, Catania, Italy
- R. Reitano
Università degli Studi di Catania, Catania, Italy
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The high intensity proton source for the European Spallation Source, designed and commissioned at INFN-LNS, is able to produce a stable total current between 40 and 125 mA through an 8 mm extraction aperture, with a proton fraction up to 87%. The best source condition for PS-ESS requirements has been investigated by means of the Optical Emission Spectroscopy (OES). OES has permitted to evaluate simultaneously the H/H2 relative abundances together with electron density and temperature. Results demonstrated that high intensity proton beams are generated in overdense plasma conditions (around 1018 m-3 electron density measured by OES), while electron temperature shows a decreasing trend with power. The results will be discussed and compared with Faraday-cup and Doppler shift measurements. Further upgrades of OES diagnostics will be highlighted.
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DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-ECRIS2018-TUP12
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TUP25 |
Study of the Influence of Magnetic Field Profile on Plasma Parameters in a Simple Mirror Trap |
144 |
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- M. Mazzaglia, G. Castro, L. Celona, S. Gammino, D. Mascali, E. Naselli, R. Reitano, G. Torrisi
INFN/LNS, Catania, Italy
- R. Miracoli
ESS Bilbao, Zamudio, Spain
- E. Naselli
Catania University, Catania, Italy
- R. Reitano
Università degli Studi di Catania, Catania, Italy
- S.B. Stefan, U.F. Ursel
MPI/IPP, Garching, Germany
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This work presents the multiple diagnostics characterization of the plasma in an axis-symmetric simple mirror trap as a function of magnetic field profile (mirror ratios and magnetic field gradient), neutral gas pressure and microwave power. The simultaneous use of Optical Emission Spectroscopy, Langmuir Probe and X-ray diagnostics allows the characterization of the whole electron energy distribution function (EEDF), from a few eV to hundreds of keV. Results show non-linear behaviours under small variations of even one source parameter and strong influence of EEDF on the Bmin/BECR ratio. Benefit and next developments will be highlighted.
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DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-ECRIS2018-TUP25
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