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Data quality control system and long-term performance monitor of the LHAASO-KM2A
Authors:
Zhen Cao,
F. Aharonian,
Axikegu,
Y. X. Bai,
Y. W. Bao,
D. Bastieri,
X. J. Bi,
Y. J. Bi,
W. Bian,
A. V. Bukevich,
Q. Cao,
W. Y. Cao,
Zhe Cao,
J. Chang,
J. F. Chang,
A. M. Chen,
E. S. Chen,
H. X. Chen,
Liang Chen,
Lin Chen,
Long Chen,
M. J. Chen,
M. L. Chen,
Q. H. Chen,
S. Chen
, et al. (263 additional authors not shown)
Abstract:
The KM2A is the largest sub-array of the Large High Altitude Air Shower Observatory (LHAASO). It consists of 5216 electromagnetic particle detectors (EDs) and 1188 muon detectors (MDs). The data recorded by the EDs and MDs are used to reconstruct primary information of cosmic ray and gamma-ray showers. This information is used for physical analysis in gamma-ray astronomy and cosmic ray physics. To…
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The KM2A is the largest sub-array of the Large High Altitude Air Shower Observatory (LHAASO). It consists of 5216 electromagnetic particle detectors (EDs) and 1188 muon detectors (MDs). The data recorded by the EDs and MDs are used to reconstruct primary information of cosmic ray and gamma-ray showers. This information is used for physical analysis in gamma-ray astronomy and cosmic ray physics. To ensure the reliability of the LHAASO-KM2A data, a three-level quality control system has been established. It is used to monitor the status of detector units, stability of reconstructed parameters and the performance of the array based on observations of the Crab Nebula and Moon shadow. This paper will introduce the control system and its application on the LHAASO-KM2A data collected from August 2021 to July 2023. During this period, the pointing and angular resolution of the array were stable. From the observations of the Moon shadow and Crab Nebula, the results achieved using the two methods are consistent with each other. According to the observation of the Crab Nebula at energies from 25 TeV to 100 TeV, the time averaged pointing errors are estimated to be $-0.003^{\circ} \pm 0.005^{\circ}$ and $0.001^{\circ} \pm 0.006^{\circ}$ in the R.A. and Dec directions, respectively.
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Submitted 13 June, 2024; v1 submitted 20 May, 2024;
originally announced May 2024.
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Search for relativistic fractionally charged particles in space
Authors:
DAMPE Collaboration,
F. Alemanno,
C. Altomare,
Q. An,
P. Azzarello,
F. C. T. Barbato,
P. Bernardini,
X. J. Bi,
M. S. Cai,
E. Casilli,
E. Catanzani,
J. Chang,
D. Y. Chen,
J. L. Chen,
Z. F. Chen,
M. Y. Cui,
T. S. Cui,
Y. X. Cui,
H. T. Dai,
A. De-Benedittis,
I. De Mitri,
F. de Palma,
M. Deliyergiyev,
A. Di Giovanni,
M. Di Santo
, et al. (126 additional authors not shown)
Abstract:
More than a century after the performance of the oil drop experiment, the possible existence of fractionally charged particles FCP still remains unsettled. The search for FCPs is crucial for some extensions of the Standard Model in particle physics. Most of the previously conducted searches for FCPs in cosmic rays were based on experiments underground or at high altitudes. However, there have been…
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More than a century after the performance of the oil drop experiment, the possible existence of fractionally charged particles FCP still remains unsettled. The search for FCPs is crucial for some extensions of the Standard Model in particle physics. Most of the previously conducted searches for FCPs in cosmic rays were based on experiments underground or at high altitudes. However, there have been few searches for FCPs in cosmic rays carried out in orbit other than AMS-01 flown by a space shuttle and BESS by a balloon at the top of the atmosphere. In this study, we conduct an FCP search in space based on on-orbit data obtained using the DArk Matter Particle Explorer (DAMPE) satellite over a period of five years. Unlike underground experiments, which require an FCP energy of the order of hundreds of GeV, our FCP search starts at only a few GeV. An upper limit of $6.2\times 10^{-10}~~\mathrm{cm^{-2}sr^{-1} s^{-1}}$ is obtained for the flux. Our results demonstrate that DAMPE exhibits higher sensitivity than experiments of similar types by three orders of magnitude that more stringently restricts the conditions for the existence of FCP in primary cosmic rays.
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Submitted 9 September, 2022;
originally announced September 2022.
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The DArk Matter Particle Explorer mission
Authors:
J. Chang,
G. Ambrosi,
Q. An,
R. Asfandiyarov,
P. Azzarello,
P. Bernardini,
B. Bertucci,
M. S. Cai,
M. Caragiulo,
D. Y. Chen,
H. F. Chen,
J. L. Chen,
W. Chen,
M. Y. Cui,
T. S. Cui,
A. D'Amone,
A. De Benedittis,
I. De Mitri,
M. Di Santo,
J. N. Dong,
T. K. Dong,
Y. F. Dong,
Z. X. Dong,
G. Donvito,
D. Droz
, et al. (139 additional authors not shown)
Abstract:
The DArk Matter Particle Explorer (DAMPE), one of the four scientific space science missions within the framework of the Strategic Pioneer Program on Space Science of the Chinese Academy of Sciences, is a general purpose high energy cosmic-ray and gamma-ray observatory, which was successfully launched on December 17th, 2015 from the Jiuquan Satellite Launch Center. The DAMPE scientific objectives…
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The DArk Matter Particle Explorer (DAMPE), one of the four scientific space science missions within the framework of the Strategic Pioneer Program on Space Science of the Chinese Academy of Sciences, is a general purpose high energy cosmic-ray and gamma-ray observatory, which was successfully launched on December 17th, 2015 from the Jiuquan Satellite Launch Center. The DAMPE scientific objectives include the study of galactic cosmic rays up to $\sim 10$ TeV and hundreds of TeV for electrons/gammas and nuclei respectively, and the search for dark matter signatures in their spectra. In this paper we illustrate the layout of the DAMPE instrument, and discuss the results of beam tests and calibrations performed on ground. Finally we present the expected performance in space and give an overview of the mission key scientific goals.
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Submitted 14 September, 2017; v1 submitted 26 June, 2017;
originally announced June 2017.