Yang, Y. Dou, W.P. Fang, X. Guo, Y.H. Jia, H. Jiang, P. Jing, L. Liu, X.J. Lu, L. Lu, W. Ma, W. Sun, L.P. Sun, L.T. Wei, Y. Zhai, Y.H. Zhao, H.W. JACoW Publishing Geneva, Switzerland 978-3-95450-203-5 10.18429/JACoW-HIAT2018-MOPB05 English 42-45 MOPB05 LEBT rfq emittance MMI ECR Contribution to a conference proceedings 2019 2019-11 https://doi.org/10.18429/JACoW-HIAT2018-MOPB05 http://jacow.org/hiat2018/papers/mopb05.pdf A Low Energy intense-highly-charged ion Accelerator Facility (LEAF), which is mainly consist of an 45 GHz superconducting ECR ion source, LEBT and an 81.25 MHz 4-vane RFQ, was designed to produce and accelerate heavy ions, from helium to uranium with A/Q between 2 and 7, to the energy of 0.5 MeV/u. The typical beam intensity is designed up to 2 emA CW for the uranium beam. The project was launched in 2015 and has been successfully commissioned with He⁺ (A/Q=4), N₂+ (A/Q=7) beam and accelerated the beams in the CW regime to the designed energy of 0.5 MeV/u. Beam commissioning results of He⁺ beam have been reported previously. This paper presents the details of N₂+ commissioning and beam studies.