Simulation Study And Prototype Testing Of Multi-wire Drift Chamber Arrays For CEE

The development of high-energy nuclear physics is very much supported by large scientific research platforms,generally including large particle accelerators and large spectrometers.A very important component of a large spectrometer are track detectors for charged particles.It is used to measure the track of charged particles,and based on this,the momentum of the charged particles is constructed,and then the charged particles can be identified by combining the time-of-flight data of the particles.Finally,the whole physics process is reconstructed.One of the large particle accelerators currently available in China is the Lanzhou heavy ion cooling storage ring.Based on the device,the plan is to build CEE in its external target experimental terminal a large particle spectrometer.The spectrometer mainly consists of a large secondary magnet,a target silicon detector,and a time projection chamber mounted in the magnetic gap.A multiwire drift chamber array and a multilayer resistive plate chamber are distributed on both sides of the beam line.The hadron energy meter is located in the beam direction.The multi-wire drift chamber array is composed of six multi-wire drift chambers,each of which has three layers of signal wires,and the three layers of signal wires have different directions,and they cooperate to measure the three-dimensional track of charged particles.Due to the complexity of the high-energy nuclear physics experiment device,in the pre-research stage,it is often necessary to cooperate with computer simulation,prototype testing and other means to ensure the rationality of the design,verify the relevant algo-rithms,find problems and propose improvements.Based on GEANT4,this paper builds a CEE front-angle track detection system on a computera twopole magnet,a multi-wire drift chamber array,and a multilayer resistive plate chamber.Using the data extracted from the experimental data as input to GEANT4,simulated experimental particles were generated for simulation of the track detection system.Based on the simulation data,combined with the geometry of the drift chamber itself,an algorithm for finding and reconstructing charged particle track is developed.The spatial resolution reaches 30 m.Based on the reconstructed track of the charged particles,combined with the magnetic field data,the particle momentum is reconstructed.The momentum resolution is 5 %.Finally,combined with flight time,particle identification is completed.In addition,based on the beam test experimental data of the drift chamber array prototype system,the algorithm for track finding and reconstruction is improved.The spatial resolution is 295 m.Several problems were found in the data processing process,including the lack of mechanical precision of the prototype system,the fire efficiency brings challenges to the track finding and reconstruction.The most important thing is to find some shortcomings of the original design.The points that need to be improved in the subsequent experiments are clarified,and corresponding improvements are proposed for the original design.