Studies on a TPC gaseous detector

A TPC gas detector was designed and fabricated．Firstly, the field cage was made with printed circuit board plates, which include some accurately located strip electrodes, so as to achieve uniformly distributed electric field in the drift region．Three layers of wire electrodes were assembled in the avalanche region．The identical potential distribution of electric field in different layers of wire electrodes were calculated, and the technologies of wire electrode wielding, tension application on wire electrodes, detector working mode transferring from trigger-on to trigger-off and vice versa were examined．Then, a DPC resistor array was used to simplify readout circuit from 400 to 4 outputs, and the calibrations of array for each node pad were carried out．Lastly, the experiments by the detector for the cosmic ray test was done．The corresponding wave form data agreed well with simulation results, and the transverse positions for these ionization events were also measured．All the work will help a lot to develop this kind of TPC detectors and to do the related experiments．