[en] Building a strong radial magnetic field with a permanent sextupole magnet for an ECRIS is extremely challenging so that the conventional wisdom recommends a small but not optimal plasma chamber that is typically of ID less or equal to 80 mm. A new 18 GHz RT ECRIS, DRAGON, with a large bore permanent sextupole has been designed and is under construction at IMP (Institute of Modern Physics, Lanzhou, China). Its plasma chamber is of ID 126 mm, the same as that of the superconducting ion source SECRAL, with maximum radial field strength reaching 1.5 T at the plasma chamber wall. The overall magnetic strengths of DRAGON, with maximum axial fields of 2.7 T at the injection and 1.3 T at the extraction, are very similar to those of SECRAL operating at 18 GHz and hopefully its performance. The source solenoid magnets are cooled by medium evaporation at about 50 C. In addition, the source is thickly insulated for beam extraction at 50 kV and higher voltage up to 100 kV can be explored. This article will present the design details and discussions of this new ion source. It is followed by the associated poster. (authors)