Miniature penning ion source in high magnetic field

Abstract

The invention belongs to the technical field of superconducting cyclotron accelerators, and particularly relates to a miniature penning ion source in a high magnetic field. The miniature penning ion source comprises a hollow anode tube arranged between a pair of electromagnets capable of generating a high magnetic field through an anode bracket. The two ends of the anode tube are provided with a pair of cathodes and the cathodes are arranged on the anode bracket through a first insulation piece and a second insulation piece. A hydrogen pipeline is arranged in the anode bracket and the hydrogen pipeline can feed the hydrogen gas into the anode tube. A high-frequency voltage can be applied on the cathodes. The length of the anode tube is about 50 mm, and the diameter of the inner cavity of the anode tube is 2-3 mm. The tube thickness of the anode tube is 0.75 mm. An extraction slit is arranged on one side of the anode tube, wherein the length and the width of the extraction slit are respectively 6-10 mm and 0.5 mm. The cathodes, the first insulation piece, the insulation piece and the air outlet of the anode bracket do not influence the vacuum degree in the ion source. During the air outlet process, gases are discharged out of materials in the vacuum. The ion source is compact in structure and can be arranged in small and narrow spaces. Meanwhile, the electric discharge of the ion source is enabled even at a very low air pressure, so that the design requirements of superconducting equal-time rotary accelerators are met.

Description

technical field [0001] The invention belongs to the technical field of superconducting cyclotrons, in particular to a miniature Penning ion source under high magnetic field Background technique [0002] A cyclotron is a device that uses a magnetic field and an electric field to make charged particles perform cyclotron motion, and is repeatedly accelerated by a high-frequency electric field during the motion. It is an important instrument in high-energy physics. Among them, the superconducting isochronous cyclotron (a superconducting cyclotron) branch) is the core equipment of the current medical proton therapy accelerator. Medical proton therapy accelerators can treat tumors with protons and heavy ion rays in the microscopic world. It is the most advanced radiation therapy technology in the world today, and only a few developed countries have mastered and applied this technology. [0003] In the superconducting isochronous cyclotron, the ion source technology is a key techn...

AI Technical Summary

Problems solved by technology

[0006] 3. The ion source needs to work in a vacuum environment. Since the overall structure is very small, it is difficult to achieve a higher vacuum degree

Images