| dc.description.abstract | The sPHENIX is an upgraded project of the former PHENIX experiment at Rela- tivistic Heavy Ion Collider (RHIC). The sPHENIX aims to study the Quark-Gluon Plasma (QGP) by measuring jets, jet correlations and Upsilons (Υs) precisely. The sPHENIX also has an active cold QCD physics program. The tracking system of sPHENIX consists of the MVTX, the TPC, the TPOT, and the Intermediate silicon Tracker (INTT). The NCU HEP participates in the INTT group. The INTT is a two-layers silicon tracker consisting of 56 silicon ladders. The INTT bridges the tracks of the MVTX and TPC, aims to improve the momentum resolution for charged particles with high transverse momentum, aids the pattern recognition, and the event synchronization. 120 silicon ladders were scheduled to be built in total. The Taiwan INTT group was responsible for one-third of them. The assembly of silicon ladders was carried out at Taiwan Silicon Detector Facility (TSiDF). The self-designed assembly tools, produced by the Academia Sinica (AS), and the programmable gantry table were introduced to meet the requirements of high-precision assembly. The assembly and test of all silicon ladders were finished in May 2022. As a tracker, the detection efficiency of INTT is required to be close to 100% to save all track candidate hits. A testbeam experiment was performed at the end of 2021, at ELPH, Japan. It provides us an opportunity to understand the performance of INTT more completely. The preliminary testbeam result shows that the detection efficiency can be up to 99.73 ± 0.02% which fits the requirement. | en_US |