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TY - CONF AU - Nakagawa, T. AU - Higurashi, Y. AU - Nagatomo, T. AU - Ohnishi, J. ED - Schaa, Volker RW ED - Pisciotta, Pietro TI - Development of Riken 28 GHz SC-ECRIS for Production of Intense Metal Ion Beam 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 - To produce intense metal ion beams (e.g. Ti¹³⁺, V¹²⁺,13+, U³⁵⁺ ) for super heavy element search and RIBF experiments at RIKEN, we tried to optimize the RIKEN 28 GHz SC-ECRIS performance. Based on the scaling low and 'high B mode' operation, we systematically measured the beam intensity of various heavy ions as a function of Binj, Br and Bext with 28 and 18 GHz microwaves. In these experiments, we observed that (1) optimum Binj>1.6~2 Bext, (2) optimum Br>1.2~1.4 Bext and (3) optimum Bext is dependent on the charge state and ion spices as described by scaling low. We also observed same tendency for 18 GHz liquid-He-free SC-ECRIS. Using this systematics, we obtained ~400μA of V¹³⁺ at the RF power of 2kW (28 GHz) and very low Bext (~1.4 T with 28 GHz). For long term operation (one month), we successfully produced very stable beam of 100~200 μA of V¹³⁺ ion. Following the success, we constructed new 28 GHz SC-ECRIS for super heavy element search experiments. In this contribution, we report the experimental results in detail and how to produce intense metal ion beams. PB - JACoW Publishing CP - Geneva, Switzerland SP - 44 EP - 48 KW - ECR KW - ECRIS KW - heavy-ion KW - ion-source KW - experiment DA - 2019/01 PY - 2019 SN - 978-3-95450-196-0 DO - 10.18429/JACoW-ECRIS2018-TUA1 UR - http://jacow.org/ecris2018/papers/tua1.pdf ER -