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arXiv · 2104.03817

A novel method to measure the dE/dx resolution of a TPC prototype using 266 nm UV laser

Yiming Cai·Yulan Li·Huirong Qi·Yuanjing Li·Jian Yang·Zhiyang Yuan·Yue Chang
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Abstract

The specific energy loss (dE/dx) resolution is critical for particle identification and separation in TPC. In connection with the R&D for the TPC at the Circular Electron Positron Collider (CEPC), we find the laser ionisation obeys the Gaussian distribution theoretically and experimentally. Based on this, we develop a novel method using a 266 nm UV laser to measure the dE/dx resolution. Comparing to the traditional methods with particle beams or cosmic rays, the novel method with 266 nm UV laser is more convenient and flexible. We verify the method's feasibility with a TPC prototype and extrapolate the dE/dx resolution to the CEPC TPC. The estimation of the dE/dx resolution is without the magnetic field.

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Yiming Cai, Yulan Li, Huirong Qi, Yuanjing Li, Jian Yang, Zhiyang Yuan, Yue Chang. 2021-04-08. A novel method to measure the dE/dx resolution of a TPC prototype using 266 nm UV laser. https://arxiv.org/abs/2104.03817

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