HI-13 tandem accelerator was running well in 2004, the machine has been operated for 3 957 h, and provided beam time 3 353 h for 40 experiment users,the terminal voltage range is from 4 MV to 13 MV. 1 The operation In 2004 HI-13 tandem accelerator provide HI-13 tandem accelerator was running well in 2004, the machine has been operated for 3 957 h, and beam time 3 353 h for 40 experiment users, the terminal voltage range is from 4 MV to 13 MV. 1 The operation In 2004 HI-13 tandem accelerator provide