Performance of the TPC with Micro Pixel Chamber Readout: micro-TPC

TL;DR

This paper presents the development and testing of a micro-TPC with a micro pixel chamber readout capable of high-rate detection of three-dimensional charged particle tracks with sub-millimeter precision, including gamma-ray imaging.

Contribution

The paper introduces a novel micro-TPC with a micro pixel chamber readout, achieving high gas gain and rate capability, and demonstrates its application in gamma-ray imaging.

Findings

Achieved gas gain over 10,000 without additional multipliers.

Detected X-rays at rates up to 7.7 Mcps.

Successfully reconstructed 3D electron tracks and gamma-ray images.

Abstract

Micro-TPC, a time projection chamber(TPC) with micro pixel chamber($\mu$-PIC) readout was developed for the detection of the three-dimensional fine(sub-m illimeter) tracks of charged particles. We developed a two-dimensional position sensitive gaseous detector, or the $\mu$-PIC, with the detection area of 10$\times$10 cm${}^{2}$ and 65536 anode electrodes of 400 $\mu$m pitch. We achieved the gas gain of over 10000 without any other multipliers. With the pipe-line readout system specially developed for the $\mu$-PIC, we detected X-rays at the rate as high as 7.7 Mcps. We attached a drift cage with an 8 cm drift length to the $\mu$-PIC and developed a micro-TPC. We measured the basic performances of the micro-TPC and took three-dimensional tracks of electrons. We also developed a prototype of the MeV gamma-ray imaging detector which is a hybrid of the micro-TPC and NaI(Tl) scintillators and confirmed its concept by reconstructing the obtained data.