CDC 2-D Track finding at Belle-II experiment

• Main Authors: Huang, Cheng-Heng, 黃誠亨
• Other Authors: Chang, Ming-Chuan
• Format: Others
• Language: en_US
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/89157662059478330445

碩士 === 輔仁大學 === 物理學系 === 99 === High Energy Accelerator Research Organization (KEK) is located in Tsukuba city, Japan. An accelerator KEKB and a detector Belle are located in a tunnel inside KEK. Belle experiment is operated for ~11 years. It is stopped for upgrade in 2010 July. The upgrade accelerator is named SuperKEKB, and the upgrade detector is named Belle-II. The Fu Jen Catholic University high energy lab joins the Central Drift Chamber(CDC) trigger system group. The main purpose of CDC chamber is to measure the trajectory and momentum of charged particles. CDC is an important tool to identify charged particles. This thesis describes two dimensional track finding method in CDC trigger system. We use the Hough transform algorithm to find the trajectory equation of charged particle in Hough plane and translate back to CDC x-y plane. We simulate a single charged particle which pass through the CDC chamber. We classify cluster cases and optimize the mesh size for a better cluster cell gathering. We use the trajectory function to trace back the momentum of the input single charged particle. The results between the input and output values are consistent.