Abstract
The Micro Pixel Chamber (μ-PIC) has been developed for a hadron-collider experiment. The main purpose is detecting Minimum Ionizing Particles (MIP) under high-rate Highly Ionizing Particles (HIP) environment. In such an environment, sufficient gain to detect MIP is needed, but continuous sparks will be caused by high-rate HIP. To reduce sparks, cathodes are made of resistive material. In this report, sputtered carbon was used as a new resistive cathode. Gas gain >104 was achieved using an 55Fe source. This value is sufficient to detect MIP without GEM or other floating structures. Also, thanks to production improvement, pixels are well aligned in the entire detection area.
Highlights
The Micro Pixel Chamber (μ-PIC) [1] [2] is a 2-D gaseous imaging detector produced with PCB/FPC technology. μPIC has been developed for many applications, such as the Electron-Tracking Compton Camera (ETCC) [3], directional dark matter search (NEWAGE experiment) [4], neutron imaging [5], and space dosimeter (PS-TEPC) [6]
We report the detector design and gas gain measurement of μ-PIC with resistive cathodes using sputtered carbon
The spark counting rate was 103∼5 times lower than normal μ-PIC with gas multiplication around 104. This means that resistive μ-PIC has high potential for both Minimum Ionizing Particles (MIP) detection and Highly Ionizing Particles (HIP) tolerance
Summary
The Micro Pixel Chamber (μ-PIC) [1] [2] is a 2-D gaseous imaging detector produced with PCB/FPC technology. μPIC has been developed for many applications, such as the Electron-Tracking Compton Camera (ETCC) [3], directional dark matter search (NEWAGE experiment) [4], neutron imaging [5], and space dosimeter (PS-TEPC) [6]. ΜPIC has been developed for many applications, such as the Electron-Tracking Compton Camera (ETCC) [3], directional dark matter search (NEWAGE experiment) [4], neutron imaging [5], and space dosimeter (PS-TEPC) [6]. One of our development targets is the new ATLAS forward muon detector called the Muon Tagger, which is being considered for installation between the end-cap calorimeter and the JD (The Disk Shielding) near the beamline (2.7 < |η| < 4.0) in the long shutdown 3 of the LHC (year 2023) [7]. There is a very small area in the ATLAS high-η region to measure the muon track, and there is large background radiation scattered near the beamline such as fast neutron and gamma ray.
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