Speaker
Description
The one square kilometer array (KM2A), a sub-array of LHAASO experiment, consists of 5195 ED and 1188 MD detectors, has been built over three-quarters scale and began operation since December 2020. Its main scientific goal is to study gamma ray sources at energies above 100 TeV. In this work, an offline self-calibration method was used to calibrate the KM2A-ED array to guarantee the key performances of the array such as angular resolution and pointing accuracy within 0.1° during long-term operation. Half of the KM2A array has been operated since December 2019 and the three-quarters has been operated since December 2020. The experimental results of the 1/2 and 3/4 arrays show that this method can be used to determine the detector time offset with an accuracy of 0.5ns and the particle number with an accuracy of a few percent. Furthermore, we monitor the calibration parameters in real time and update the calibration results regularly to ensure the data quality of the detector. As a result, the observation of moon shadow is used to further check the reliability of calibration results.
| Subcategory | Experimental Methods & Instrumentation |
|---|---|
| Collaboration | Lhaaso |
