Performance of the TPC with micro pixel chamber readout: micro-TPC

Micro-TPC, a time projection chamber (TPC) with micro pixel chamber (μ-PIC) readout, was developed for the detection of the three-dimensional (3-D) fine (∼ submillimeter) tracks of charged particles. We developed a two-dimensional position sensitive gaseous detector or the μ-PIC, with the detection area of 10×10 cm² and 65536 anode electrodes of 400 μm pitch. We achieved the gas gain of more than 10⁴ without any other multipliers. With the pipeline readout system specially developed for the μ-PIC, we detected X-rays at the maximum rate of 7.7 MHz. We developed a micro-TPC with the μ-PIC and 3-D tracks of electrons were detected with the micro-TPC. We also developed a prototype of the MeV gamma-ray imaging detector which is a hybrid of the micro-TPC and NaI(Tl) scintillator so that we showed that this is a promising method for the MeV gamma-ray imaging.