High voltage-resistant electrostatic deflection plates in a compact superconducting proton cyclotron

Abstract

The invention relates to a high voltage resistant static deflecting plate in a compact superconductive proton cyclotron. The static deflecting plate comprises a space surrounded by an upper grounding plate, a lower grounding plate, a rear grounding plate and a cutting plate. A high voltage electrode is arranged in the space. The high voltage electrode is fixed on the real grounding plate through an insulating column. The length of the insulating column is set to ensure that the creep distance is no less than 25 mm. The cutting plate is characterized in that the upper and lower parts are thick and the middle part is thin. According to the invention, the structural size of the high voltage electrode of the static deflecting plate in the superconductive proton cyclotron and the distance between the surface of the high voltage electrode and the grounding metal plate are optimized, the surface electric field of the high voltage electrode is reduced, field electron emission is weakened, and the voltage resistance of the deflecting plate is improved; in addition, the difficulty of electrode surface processing of the deflecting plate is reduced, and the manufacturing cost is lowered.

Description

technical field [0001] The invention belongs to the electrostatic high-voltage technology applied in a superconducting proton cyclotron, and in particular relates to a high-voltage-resistant electrostatic deflection plate in a compact superconducting proton cyclotron. Background technique [0002] Superconducting proton cyclotrons are widely used in the fields of nuclear medicine, aerospace military industry and basic research of nuclear physics. Electrostatic deflection plate is a common beam extraction method in cyclotron. The electrostatic deflection plate is composed of a cutting plate, a negative high-voltage electrode, a grounded metal shell and an insulating column. The cutting plate is grounded, and the electrode is fed into high voltage by an external power supply. There are two discharge breakdown mechanisms in electrostatic deflectors: vacuum breakdown and insulation breakdown. For the former, it is mainly caused by field emission electrons on the surface of hig...

AI Technical Summary

Problems solved by technology

Electrons are emitted from the surface of the electrode and hit the metal shell, and the metal releases gas to pollute the vacuum environment, which is prone to sparking; on the other hand, if the local temperature of the metal is too high, it may melt and drip on the high-voltage electrode, causing the electrode surface to sag, thereby produce irreparable electrostatic deflector damage

The magnetic pole gap in the compact superconducting cyclotron is very small, generally no more than 60mm, and the electrostatic deflection plate is placed in the gap between the magnetic poles in the peak area, resulting in a very close distance between the high-voltage electrode and the grounded metal surface, and the required deflection plate voltage is often higher , prone to ignition

Images