Testing the STS sensor characteristics of the CBM unit with a laser source

The paper presents the results of testing the sensor of the STS system of the CBM device and determines its characteristics using a laser source, called a test pulser. The paper also briefly describes the design, working principles and characteristics of the silicon track system sensor. As for the testpulser, it simulates the passage of a charged particle in the sensor and allows determining individual sensor memories and their time stability. In the process of particle irradiation, the sensor's sensitivity can decrease, and, accordingly, errors can increase. A test pulser simulates the passage of a charged particle in the sensor and allows the determination of individual sensor memories and their time stability. Thus, the main purpose of the test pulser is to test the suitability of modules. STS modules should perceive the initial parameters that a pulser will be set to and provide the necessary information about them. To achieve this, we have created a laser test pulser on the Arduino breadboard, on which we could set certain parameters (frequency, ignition-off period, etc.). Then, we compared the results obtained from the STS sensor module to the initial parameters. The method can also determine the sensitivity of an individual sensor over the entire working area, as well as its saturation threshold. The work was performed during a 2-month internship at the Center for Heavy Ion and Antiproton Research (FAIR) in Darmstadt (Germany).