A pre-cutter for beam pulse control

Abstract

The invention discloses a pre-cut beam splitter used for beam pulse control. The pre-cut beam splitter comprises an electrostatic deflection plate installed at a magnetic-focusing and matched-structure low-power transmission line tail end, a power supply providing a voltage for the electrostatic deflection plate and an attached device which matches with and is used with the electrostatic deflection plate. The attached device is installed on the low-power transmission line tail end and is located in front of the electrostatic deflection plate. The electrostatic deflection plate is formed by two flat electrode plates. The two electrode plates are symmetrically installed in a mirror image mode. A width and an installation distance of the two electrode plates present positive correlation linearity changes along with a diameter of a beam envelop. By using the pre-cut beam splitter, the electrode plates which change along with the beam envelop are taken as the electrostatic deflection plate; an electrostatic cutting beam is firstly used in the Chinese spallation neutron-source magnetic-focusing and matching-structure low-power transmission line; cutting beam rise / falling edge time is less than 15ns; and a new device and a new method are provided for a pre-cut beam of a spallation neutron source.

Description

technical field [0001] The present application relates to the field of beam control, in particular to a pre-cutter used for beam pulse control. Background technique [0002] In the China Spallation Neutron Source (abbreviated as CSNS), the particle accelerator is a device that increases the energy of charged particles, including linear accelerators and circular accelerators. The linear accelerator accelerates the proton beam to 80Mev, and the circular accelerator accelerates the proton beam to 1.6Gev, and then the proton beam is extracted through the beam extraction system, and the extracted beam bombards the heavy metal tungsten target to obtain neutrons, which serve as detectors. The needle detects the microstructure of various materials. [0003] Among them, the linear accelerator includes two transmission lines, a low-energy transmission line (abbreviated as LEBT) and a medium-energy transmission line (abbreviated as MEBT). The LEBT is located between the ion source an...

AI Technical Summary

Problems solved by technology

The Japanese pre-beam cutter, whose transformer core material is made of magnetic alloy material (FINEMET), has a large cavity loss, the pre-beam cutter itself is difficult to manufacture, and the price is very expensive; at the same time, it needs to use a modulation voltage of 8.5kV to control the beam current. For energy modulation, the power supply is difficult to achieve

More importantly, experiments show that the rising / falling edge plus the tail is about 100ns, and the experimental results are not ideal

Therefore, the Japanese pre-cutter has basically been abandoned

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