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TY - CONF AU - Gallo, C.S. AU - GalatÃ , A. AU - Mascali, D. AU - Torrisi, G. ED - Schaa, Volker RW ED - Pisciotta, Pietro TI - A Possible Optimization of Electron Cyclotron Resonance Ion Sources Plasma Chambers 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 - In the resonant cylindrical cavities of Electron Cyclotron Resonance Ion Sources (ECRIS), microwave fields are used to generate and sustain the plasma. Normally, resonant modes of a higher order than the fundamental one are excited, due to the high frequency used compared to the dimensions of the plasma chambers: this can lead to small electric fields on the resonant surface, translating in low electrons energy and poor source performances. In this paper, we propose a possible modification of the conventional plasma chambers, resulting from an electromagnetic study carried out on a Caprice-type full permanent magnet ECRIS. Such modification implies the excitation of a "length-independent" resonant mode, having an intense and homogeneous electric field on the plasma chamber axis. This characteristic makes the modification suitable to be applied to numerous ECR sources. The positive effect on the plasma electrons density distribution will be also shown. PB - JACoW Publishing CP - Geneva, Switzerland SP - 67 EP - 70 KW - plasma KW - electron KW - resonance KW - ECR KW - ECRIS DA - 2019/01 PY - 2019 SN - 978-3-95450-196-0 DO - 10.18429/JACoW-ECRIS2018-TUB3 UR - http://jacow.org/ecris2018/papers/tub3.pdf ER -