Neutron generation target

Abstract

The invention relates to the technical field of target bodies driven by accelerators, in particular to a high-power neutron generation target for driving an accelerator, which has an efficient cooling function and a temperature and beam spot monitoring function. The neutron generation target comprises a target material layer, a particle migration layer, a micro-channel substrate layer and a cover plate layer which are sequentially connected in an attached mode to form an integrated multi-layer structure target body, and a plurality of thermocouple assemblies are arranged on the target body. A plurality of rows of fins are machined on the surface of the micro-channel substrate layer, and a micro heat dissipation channel is formed between every two adjacent fins. According to the invention, the problem that the infrared imaging camera cannot work for a long time in a high-dose radiation environment around the target body is solved; the neutron generation target is cooled by using a micro heat dissipation channel structure, so that the shape of a proton beam spot can be predicted, and the temperature of the target material can be monitored; the uniformly distributed thermocouples are adopted, and the distances from the thermocouples to the surface of the target material are consistent, so that a uniformly measured temperature field is formed, and beam spot shape prediction is facilitated.

Description

technical field [0001] The invention relates to the technical field of generating accelerator-driven targets, in particular to an accelerator-driven high-power neutron generation target with functions of efficient cooling, temperature and beam spot monitoring. Background technique [0002] When the particles or rays produced by the accelerator bombard the neutron production target, especially the low-energy protons, high unit heat flux and high thermal load power, such as the boron neutron capture therapy cancer device, which uses protons as incident particles, and the proton energy is at 2MeV Between ~10MeV, the proton beam power is as high as 30kW or more, and the range of protons in the metal is relatively short, and the heat flux exceeds 100kW / cm2. Due to the low range of protons, the beam measurement element irradiated by protons will be deposited in the beam measurement element and cause it to burn, so it is difficult to obtain a specific beam spot distribution; in add...

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Problems solved by technology

However, there are the following problems: first, the temperature measuring line of the thermocouple in the above scheme is drawn out from the vacuum side, and needs to be drawn out through a vacuum wall-penetrating piece, which is difficult to arrange, and the arrangement of thermocouples at multiple different positions makes installation more difficult; Second, in the case of high beam power, the lead wire or thermocouple of the temperature measuring element that penetrates into the center of the beam will be directly irradiated by the beam, causing the temperature to be too high and causing burning; third, the temperature measuring element penetrates into the beam in vacuum In the center, the beam directly irradiates the temperature measuring element instead of the target body, resulting in a decrease in neutron yield; fourth, the temperature measuring element penetrates directly into the cooling seat from all sides, destroying its cooling structure and reducing the heat transfer effect, while limiting the number of measurement points , leading to inaccurate response beam spot distribution

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