A high-voltage electrostatic acceleration tube for strong current ions

Abstract

The invention provides a high-voltage electrostatic acceleration tube for strong current ions, which includes an acceleration tube body; the acceleration tube body specifically includes an inlet cylinder, an inlet flange, an inlet flange jacket, a magnetic mirror device, an accelerating electrode, and a double electron cloud space charge Lens device, outlet flange jacket, outlet flange, outlet cylinder, insulation ring, pressure equalizing ring and insulation column, etc.; there is a magnetic mirror device between the inlet flange jacket and the inlet cylinder, and the outlet flange jacket A double electron cloud space charge lens device is arranged between the exit cylinder and the radius of the central circular hole of each accelerating electrode decreases sequentially along the beam transmission direction. The present invention utilizes the focusing electric field and the beam-plasma interaction to respectively enhance the ion focusing force in the acceleration area and the area of ​​the entrance and exit of the acceleration tube, suppress the beam dispersion caused by the strong space charge effect under the condition of a strong ion beam, and reduce the beam loss and inhibition The increase of the beam emittance can realize the efficient and stable acceleration of the high-current ion beam.

Description

technical field [0001] The invention relates to the technical field of particle accelerators, in particular to a high-voltage electrostatic acceleration tube for strong current ions. Background technique [0002] With the continuous development of science and technology, particle accelerator science and technology has made great achievements, and its application scope has gradually moved from the field of basic research to all fronts of industry, agriculture, medicine and national defense construction. Especially the recently developed accelerator-driven advanced nuclear energy system has gradually become a research hotspot in various countries. [0003] An accelerator is a device that artificially generates beams of high-energy charged particles. It uses a certain form of electromagnetic field to accelerate charged particles such as positive and negative electrons, protons, light and heavy ions to keV, MeV, GeV, TeV or higher energies. This kind of ion beam with relativel...

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Problems solved by technology

[0005] In the traditional high-voltage electrostatic accelerating tube design process, the withstand voltage level of the accelerating tube is limited by vacuum breakdown, which is mainly manifested in the following two aspects: 1) The withstand voltage gradient of the accelerating tube will increase with the increase of the total voltage of the accelerating tube 2) When the voltage reaches a certain threshold, a large amount of electron flow will suddenly appear in the accelerating tube, accompanied by strong X-rays. If the voltage continues to increase, the electron flow will increase sharply and soon exceed the load of the high-voltage generator capability, thus limiting further increases in voltage

At the same time, when the beam intensity accelerated by the accelerating tube is further increased, the nonlinear part of the strong space charge effect will cause the beam emittance to increase, so that the beam envelope of the high-current ion beam is too large and is lost in the accelerating tube. On the wall of the insulator or on the accelerating electrode, a large number of secondary electrons are generated, thereby destroying the withstand voltage level of the accelerating tube and limiting the acceleration of the accelerated beam current intensity of the accelerating tube

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