Speaker
Description
The Super Tau-Charm Facility (STCF) is an electron-positron collider to be built in China. It is designed to operate in the center-of-mass energy range of 2 to 7 GeV with a peak luminosity of $0.5×10^{35}\ cm^{-2}s^{-1}$ or higher. In the STCF detector, the Inner TracKer (ITK) is an important component of the tracking system and needs to achieve a spatial resolution in the $r$-$\phi$ direction of <$100\ \mu m$ and a low material budget of <0.3% X₀ per layer. One proposed design is a Cylindrical Micro Resistive Groove ($C$-$\mu RGroove$) Micro Pattern Gas Detector (MPGD) and a series of key technologies are studied. The 2D readout structure with the grounded strip-shaped groove on the top copper layer and additional strips under the bottom of the groove is proposed to achieve a low material budget, which also addresses the issue of charge-sharing and enhances the induced signal amplitude. Beam test results of the first prototype $C$-$\mu RGroove$ at the CERN-SPS beamline with 150 GeV/C muons show a detection efficiency of >95% and a spatial resolution of <$100\ \mu m$ for vertically incident particles. The hit position is reconstructed using an algorithm combining the micro-time projection chamber method and the charge center-of-gravity method. The high channel density and high counting rate pose a great challenge to the readout electronics, so a customized mixed-signal ASIC is also designed to perform low-noise signal processing and amplitude & time measurement in one chip.
| Primary experiment | Super Tau-Charm Facility (STCF) |
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