Kun's weekly group discussion

Wednesday 31 Jan 2024, 13:30 → 15:00 Asia/Shanghai

Tsung-Dao Lee Institute/N5F-N531 - Discussion Room (Tsung-Dao Lee Institute)

13:30 → 14:00 DarkSHINE tracker, analysis and simulation

13:30 Tracking detector R&D

Speaker: Kang Liu

13:40 Tracking reconstruction

Speaker: Junhua Zhang

Write a more detailed technical manual for the probe station and ammeter.

13:50 Simulation and analysis

Speaker: Yufeng Wang (TDLI)

• checking truth track (charged particle) number and physics processes in each track layer to understand the impact of hit energy cuts.
• baseline 1.6 analysis plan
  • reconstruction: tracking, clustering
  • analysis selection optimization
  • systematics

14:00 → 14:30 ATLAS performance and physics

14:00 ttW/ttH -> multi-leptons analysis

Speaker: Jialin Li

Check and reproduce bad ntuples.

Continue to write internal note and start to write thesis.

14:10 Electron/photon performance, H->Zgamma and gg* analysis

Speakers: Danning Liu (TDLI/SJTU), Kang Liu, Rui Yuan (SJTU)

14:30 → 14:50 Round table

Speakers: Dian YU (Tsung-Dao Lee Institute), Lin Yang (TDLI), Zhiyang Dai

YangLin

1 Tracker I-V Test:

上周4完成了Darkshine tracker编号为C4的pixel 区域的I-V测试曲线。

从数据来看，这次的电流相比B4 23年以及C4 22年的数据都整体偏低，<25 V和B4/C4之前的数据基本一样，25-115 V电流明显偏低，>115 V示数异常，电流陡增。雪崩电压相较以往偏早的原因，大概率是高电压读数时间隔时间太长，更近一步的原因是电流示数不稳定。

从接地线效果来看，低电压（<20 V）下的电流示数要比未接地之前稳定一些。但随着电压增大，还是存在一个明显的问题是：测试过程中读数最大波动差不多仍是～0.1 nA，和之前未接地的情况差不多，比在闵行测试的(~0.01 nA)大。且电流变动幅度不是固定的，会随着电压增大而增加，变动位数基本都在示数的第2位。个人初步猜测导致这种现象的原因是无油空压机运行带来的地面震动使针头发生抖动，因为关闭无油空压机摄像头的画面的抖动基本消失了。

2 C++ Basics: learn from the B1 GEANT4 project

3 To-Do:

实验室操作步骤流程图，

I-V & C-V测试接线图。

 

Dian:

1. B4 damage
2. 自动化测量程序