Speaker
Description
Based on the state-of-the-art Monolithic Active Pixel Sensor (MAPS) technology, the silicon pixel detector has been successfully applied in the STAR Heavy Flavor Tracker (HFT) for the first time since early 2014. The HFT allows precise measurements of open heavy flavor hadron production in heavy-ion collisions over a wide range of transverse momentum at RHIC. After the 2$^{\rm{nd}}$ long shutdown (LS2) during 2019 to 2020, the ALICE detector will be upgraded to enable the read-out of all interactions and accumulate more than 10 nb$^{-1}$ of Pb+Pb collisions in Run 3 (2021 - 2023) and Run 4 (2026 - 2029). One of the key components of the ALICE LS2 upgrade programme is that a new low material and high-resolution silicon pixel detector for the Inner Tracking System (ITS) based on the next generation of MAPS technology will be built, which has been adopted by sPHENIX and NICA/MPD experiments for faster vertex detector development in coming years.
The Chinese group has constructed a complete assembly line and built an experienced team on large area pixel chip integration and testing at CCNU. As one of five ALICE ITS Outer Barrel (OB) Hybrid Integrated Circuit (HIC) construction sites, CCNU has completed the OB HIC construction with a yield of about 80\%, approximately 20\% of the ITS OB HIC modules (equal share planned over 5 sites). The positioning accuracies of chip alignment and wire-bonding are well controlled within 5 $\mu$s ($@3\sigma$). Development of the MAPS-based pixel detector for the HIC experiments at CCNU is introduced in this poster, and the advanced techniques involved in the detector assembly and test are described. We will also report the plan in China on the Inner Tracker (IT) construction for the NICA/MPD experiment, and the MAPS-based IT detector will enable MPD to measure charm production at NICA energies and benefit clean measurement of multi-strange hadron spectra.
