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TY - CONF AU - Yoshimoto, T. AU - Fukushima, K. AU - Lidia, S.M. AU - Maruta, T. AU - Ostroumov, P.N. AU - Pozdeyev, G. AU - Ren, H.T. ED - Koscielniak, Shane ED - Satogata, Todd ED - Schaa, Volker RW ED - Thomson, Jana TI - Ion Beam Studies in the FRIB Front End J2 - Proc. of IPAC2018, Vancouver, BC, Canada, April 29-May 4, 2018 C1 - Vancouver, BC, Canada T2 - International Particle Accelerator Conference T3 - 9 LA - english AB - The commissioning of the FRIB Front End with 12 keV/u argon beam started in the spring of 2017*. Beam profile monitors were used to evaluate RMS Twiss parameters in various locations along the beam line. Beam dynamics in the LEBT was simulated using full 3D model of beam optics elements in the tracking codes. We found a good consistency between measured and simulated data. A beam image viewer was used to measure the beam density distribution in the real space. A hollow beam structure was observed in the Ar⁹⁺ beam with the current of ~20 eμA. Extensive beam dynamics study with 3D tracking code suggests that the hollow density distribution can be generated by space charge effects of the multi-component, multi-charge state ion beam just after the ECR ion source. This paper reports studies of a mechanism that can produce a hollow beam structure. PB - JACoW Publishing CP - Geneva, Switzerland SP - 1094 EP - 1096 KW - ion-source KW - space-charge KW - ECR KW - coupling KW - optics DA - 2018/06 PY - 2018 SN - 978-3-95450-184-7 DO - 10.18429/JACoW-IPAC2018-TUPAL040 UR - http://jacow.org/ipac2018/papers/tupal040.pdf ER -