Status Of High Intensity Low Energy Injector For Jinping Underground Nuclear Astrophysics Experiments

The China Jinping Underground Laboratory (CJPL) is currently the deepest underground Lab in the world. Taking advantage of the ultralow background in Jinping underground lab, a 400kV high voltage accelerator driven by a 2.45GHz ECR ion source and highly sensitive detectors are planned to be used to study directly a number of important nuclear reactions. A compact and intense 2.45GHz permanent magnet ion source with a low energy beam transport system (LEBT) will serve as the ion injector of the high voltage acceleration tube to produce high intensity beams, such as 10 mA H+, 10 mA He+ and 2 mA He2+ The compact LEBT consists of two solenoid lens integrated with a steering magnet, a 30 degree dipole magnet and two diagnostic chambers. The ion source and LEBT system have been successfully developed and commissioned on a stand alone test bench, and is now connected to the 400 kV high voltage platform accelerator system in a ground level test laboratory. In this paper, the studies of this intense beam injector system, for instance, beam intensities, species and ratio will be presented.