Recirculation gas stripper has the advantages of high beam acceptance

high gas density in stripper tube comparing with original gas stripper and less increase of beam emittance comparing with foil stripper. Recently a new recirculation gas stripper has been designed and manufactured for the EN tandem at Peking University. The structure

installation and performance of this stripper are described in this paper. Based on this improvement

the beam transmission of 10Be3+ has been increased from 5% to 11%

heavy ions with high charge state up to 17 have also been obtained for fabricating nano structure with ion track technology.