Zoom connection information
Meeting ID: 666 4623 8623
Passcode: cepc-tdr
## Date and Time
* Participants
* IHEP MB A420: Baohua Qi, Huaqiao Zhang, Dejing Du, Boxiang Yu, Yatian Fei, Jinfan chang, Fangyi Guo, Yong Liu
* Remote on Zoom: Haoyu Shi, Jianbei Liu (chair), Haijun Yang, Weizheng Song, Junsong Zhang, Wei Wei, Tohru Takeshita, Qi Yan, Zhiyu Zhao, Yang Zhang, Hengne Li, Shaojing Hou, Shengsen Sun, Ji-yuan Chen, Quan Ji
* New time arrangements: 14:00 - 16:00
## Beam-induced Backgrounds
* Brief talk by Haoyu Shi
* A summarised table: background types, Higgs/Z mode, noise estimates, radiation does
* For several background types, ready for mass production
* Pending on computing resources
* Also depend on the detector geometry description in CEPCSW
## AHCAL Mechanics Design
* First mechanics design for AHCAL: talk by Yatian Fei
* 2 mm for 3 barrel segments along Z
* 0.4 mm for 4 barrel segments along Z and also including 2-point constraints in phi-module
* Discussions
* AHCAL module assembly procedure ->
* Tolerances per layer -> area of absorber plates -> production precision
## Crystal calorimeter mechanics design
* Updated mechanics (schematics) of long-bar crystal calorimeter: talk by Shaojing Hou
* (No simulation results of deformation)
* Discussions
*