A curved airfoil radio frequency quadrupole accelerator

Abstract

The invention relates to the technical field of ion accelerator acceleration mechanisms, in particular to a bent airfoil radio frequency quadrupole accelerator. It is characterized in that it includes a cavity, and four wings are arranged in the cavity, and end plates are respectively set at both ends of the cavity, and a beam hole is set in the center of each end plate, and the center line of the two beam holes is in line with the cavity The central axis of the body is on the same straight line; the cavity is also provided with a π-mode stabilizing rod and a tuner for adjusting the frequency. By bending the wings at the pole head, the size of the cavity cross-section is greatly reduced while the total lateral length of the wings remains unchanged, which is very suitable for low-frequency beams; at the same time, due to the traditional four-wing radio frequency The cooling system of the quadrupole acceleration structure is simple and effective, so it is very suitable for continuous wave working conditions. The invention has obvious advantages in reducing the processing difficulty of the radio frequency quadrupole accelerator, reducing the engineering cost, improving the reliability and stability of equipment operation, and the like.

Description

technical field [0001] The invention relates to the technical field of ion accelerator acceleration mechanisms, in particular to a bent airfoil radio frequency quadrupole accelerator. Background technique [0002] The radio frequency quadrupole (RFQ) accelerator that appeared in the 1970s played a huge role in promoting the rapid development of accelerators in the world. The RFQ accelerator integrates beam acceleration, focusing and beam focusing, and is mainly suitable for the acceleration of low-energy beams, and is generally used as an injector for medium- and high-energy accelerators. At present, the accelerating structure of low-frequency RFQ accelerators commonly used by people is mainly a four-bar structure. When working in a continuous wave (CW) state, it is required that the RFQ accelerator must have a reasonable cooling system to effectively deal with the large amount of heat generated by the cavity during continuous operation. However, the cooling system of the ...

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Problems solved by technology

However, the cooling system of the four-rod RFQ accelerator is quite complicated. It generally consists of electrode cooling channels, support plate cooling channels, pad cooling channels and bottom plate cooling channels. great difficulty

At the beginning of this century, the American Argonne Laboratory (ANL) proposed a windowed four-wing RFQ acceleration structure, which is also suitable for low frequency ranges, but its disadvantage is also that the cooling system is complicated

[0003] Theoretically speaking, the traditional four-wing RFQ accelerator acceleration structure can also be used in the low-frequency field, and the acceleration structure has the advantages of simple and effective cooling system, but when it is applied in the low-frequency field, its cross-sectional size is often large. Take the four-wing RFQ accelerator at Michigan State University (MSU) as an example. Its operating frequency is 80.5MHz and the inner diameter of the cavity reaches 940mm. Welding furnace, the most important thing is that the processing accuracy is not easy to guarantee

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