Open type field cage for improving electric field uniformity

Abstract

The invention discloses an open type field cage for improving the electric field uniformity, which relates to the technical field of nuclear detection, and can greatly reduce the distortion of the electric field in the field cage of a time projection chamber detector, expand the electric field uniformity area of the field cage and improve the performance of a time projection chamber. Through improving thefield cage electrode layout, the distortion area can be reduced to be less than 1 cm away from the edge of the field cage, and for a typical 10*10 cm<2> time projection chamber, the electric field uniform area in the field cage can be improved to be more than 8*8 cm<2> and accounts for more than 64% of the total effective area.

Description

technical field [0001] The invention relates to the technical field of nuclear detection, in particular to an open field cage for improving electric field uniformity. Background technique [0002] The time projection chamber is a high-precision charged particle track detector. The time projection chamber is mainly composed of a field cage and an amplifying detector. The field cage is used to generate a uniform electric field. The drift time in a uniform electric field can obtain the track information of the incident particle. [0003] In low-energy nuclear physics experiments, small time projection chambers with open field cages can be used to measure the motion tracks of atomic nuclei and nuclear fragments. The open field cage is usually composed of metal rings evenly arranged at equal center distances. The advantage is that it has less resistance to nuclei and nuclear fragments. The disadvantage is that it is close to the metal rings, and the most important ones are betwe...

AI Technical Summary

Problems solved by technology

The open field cage is usually composed of metal rings evenly arranged at equal center distances. The advantage is that it has less resistance to nuclei and nuclear fragments. The disadvantage is that it is close to the metal rings, and the most important ones are between the metal rings and the drift electrodes and guard rings. At the electrode connection, the electric field distortion is relatively large, and these areas are no longer a uniform electric field, resulting in a large distortion of the measured particle track at the edge of the field cage

The particle track distortion caused by the electric field distortion of the field cage will not only increase the measurement error, but also cause the loss of some events, which greatly affects the accuracy and efficiency of low-energy nuclear physics experiments.

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