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TY - CONF AU - Castro, G. AU - Celona, L. AU - Gammino, S. AU - Leonardi, O. AU - Mascali, D. AU - Mazzaglia, M. AU - Miraglia, A. AU - Naselli, E. AU - Neri, L. AU - Reitano, R. AU - Torrisi, G. ED - Schaa, Volker RW ED - Pisciotta, Pietro TI - Results of the Optical Emission Spectroscopy diagnostics of the ESS proton source 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 - 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. PB - JACoW Publishing CP - Geneva, Switzerland SP - 107 EP - 110 KW - plasma KW - electron KW - proton KW - experiment KW - diagnostics DA - 2019/01 PY - 2019 SN - 978-3-95450-196-0 DO - 10.18429/JACoW-ECRIS2018-TUP12 UR - http://jacow.org/ecris2018/papers/tup12.pdf ER -