Author: Nagatomo, T.
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TUA1 Development of Riken 28 GHz SC-ECRIS for Production of Intense Metal Ion Beam 44
 
  • T. Nakagawa, Y. Higurashi, T. Nagatomo, J. Ohnishi
    RIKEN Nishina Center, Wako, Japan
 
  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.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2018-TUA1  
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TUA3 New 28-GHz Superconducting ECR Ion Source for Synthesizing New Super Heavy Elements of Z > 118 53
 
  • T. Nagatomo, M. Fujimaki, N. Fukunishi, Y. Higurashi, O. Kamigaito, K. Kumagai, T. Nakagawa, J. Ohnishi, N. Sakamoto, A. Uchiyama
    RIKEN Nishina Center, Wako, Japan
 
  To increase the intensity of heavy-ion beams such as V and Cr for synthesizing new super heavy elements (SHE), we started to construct a new 28-GHz Superconducting ECR ion source (SC-ECRIS) for RIKEN Linear Accelerator (RILAC) in 2017. The new SC-ECRIS consists of fully SC magnets and is designed to produce the beams of more than a hundred µA. RILAC is also currently being upgraded by adding superconducting (SC) rf cavities. The beam losses not only in the cavities but also in the beam pipes neighboring them must be avoided to keep the environment in the cold section as clean as possible. Thus, the high-intensity beam with well-controlled emittance is required for this SHE project. To meet the requirement, we use a triplet slits to limit the transverse emittance of the beam in the low energy beam transport (LEBT). In this contribution, we report the recent developments and the property of the first beam extracted from the new 28-GHz SC-ECRIS.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2018-TUA3  
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