September 24, 2020

The preliminary results of the beam test of the dark matter particle detector passed the review

On October 26, the preliminary processing results of the "dark matter particle detection satellite" (DAMPE) payload beam test successfully passed the review at the University of Science and Technology of China.

The dark matter particle detection satellite is one of the strategic leading science and technology special projects of the Chinese Academy of Sciences. Its overall goal is to strive to launch the dark matter particle detection satellite in 2015, through high-resolution, wide-band observation of high-energy electrons and gamma-ray indirect measurements and measurements in space. Studying dark matter particles, seeking breakthroughs in the frontier scientific field of dark matter research.

Since the launch of the Dark Matter Particle Detection Satellite Payload and Dark Matter Particle Detector in Beijing on December 23, 2011, the participating units (Purple Mountain Observatory of the Chinese Academy of Sciences, University of Science and Technology of China, Institute of Modern Physics, Chinese Academy of Sciences, Space Center of Chinese Academy of Sciences, Chinese Academy of Sciences The Institute of High Energy Physics) overcame various difficulties and completed the development of electrical parts at the end of July 2012. After a two-month desktop joint test (Nanjing), the relevant developers of the participating units went to the European Nuclear Center (CERN) for a seven-day beam test (October 1-8) in late September.

The beam test successfully tested the performance of the detector (electron energy linearity, energy resolution, hadron / electron shower discrimination, etc.). After completing the beam test, the scientific data analysis team immediately invested in data processing despite the hard work of the test. Up to now, the data processing has initially completed the calibration of the detector energy, the linear scale of the detector, etc., and the results of energy resolution, energy linearity, and electron / hadron shower discrimination map of the calorimeter are obtained. Preliminary data processing results show that for 200GeV electrons, the energy resolution of the calorimeter is less than 1%.

After the preliminary analysis results of the scientific data analysis team of the detector, the preliminary results of the beam test were reviewed in the Department of Modern Physics, University of Science and Technology of China on October 26. The review experts agreed that the beam test achieved satisfactory results, and also put forward useful suggestions for the next beam test.

It is reported that this beam test is the first time that the Chinese have transported such a large instrument to CERN for beam test. The solidarity and cooperation of the developers made the test run smoothly, and also left a good impression on the international counterparts.

Figure 1 Beam test site

Figure 2 Site of preliminary results review of beam test

Figure 3 Energy resolution and linearity (electron)

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