2016 IEEE Power Modulator and High Voltage Conference

Repetitive pulse X-rays generator based on all solid state pulsed power source

6 Jul 2016, 11:45

15m

Gold Ballroom (Palace Hotel San Francisco)

Oral Presentation Accelerators, Beams, and Repetitive Pulsed Power Oral 2

Speaker

Jianqiang Yuan (China Academy of Engineering Physics)

Description

Repetitive pulse X-rays play an important role in the investigation of various physical processes in hydrodynamic experiments. Generation of repetitive pulse X-rays requires repetitively operating all solid state pulsed power source and X-ray diode. As the testbed for repetitively operated diodes, a stacked Blumlein line (SBL) type pulsed power source (220 kV, 1 kA, 1 kHz) based on high power photoconductive semiconductor switches (PCSSs) has been constructed at Institute of Fluid Physics, CAEP. The industrial cold cathode diode was employed to generate intense X-rays. The blade-shaped metals or metal foils are typically used as the cathode material. In order to enhance electron emission, metal-ceramic surface flashover cathodes (spoke-shaped or not) were proposed and tested recently. The electric field strengths at triple points were calculated and used to determine the cathode parameters. ICCD images show that the spoke-shaped metal-ceramic surface flashover cathode has more uniform electron emission than metal foil cathode. The experimental results show that metal-ceramic surface flashover cathode could improve the diode performance by enhancing emission current. By employing spoke-shaped metal-ceramic surface flashover cathodes, pulse X-rays with FWHM of 40 ns were generated. This all solid state X-ray generator can be operated in the repetition rate more than 1 kHz. *This work was supported by National Natural Science Foundation of China (51007085, 51207147, 51407170 and 51477185)