Test bench for fibers of the LHAASO-WCDA time calibration system

The Water Cherenkov Detector Array (WCDA), which is one of the main components of the Large High Altitude Air Shower Observatory (LHAASO), functions in surveying the northern sky for high-energy gamma ray sources at the energy range around of 100 GeV–30 TeV. The precision of the time measurement for...

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Bibliographic Details
Published inJournal of instrumentation Vol. 12; no. 10; p. P10021
Main Authors Liu, J.Y., Gao, B., Yu, C.X., Chen, M.J., Luo, Y.A., Yao, Z.G., Zha, M., Wu, H.R., Li, H.C., Wang, X.J.
Format Journal Article
LanguageEnglish
Published Bristol IOP Publishing 26.10.2017
Subjects
Arrays
Bundles
Calibration
Cerenkov counters
Cosmic ray showers
Error detection
Gamma ray sources
Gamma rays
High altitude
Northern sky
Offsets
Sensors
Surveying
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Summary:The Water Cherenkov Detector Array (WCDA), which is one of the main components of the Large High Altitude Air Shower Observatory (LHAASO), functions in surveying the northern sky for high-energy gamma ray sources at the energy range around of 100 GeV–30 TeV. The precision of the time measurement for shower particles hitting every detector in the array is directly associated with the detection sensitivity for the sources. The calibration precision of the time offsets among the detector cells should be less than 0.1 ns to obtain less than 0.1ˆ pointing error of the detector to any point source. In this regard, “cross calibration” is employed for the detector array, with 180 bundles of fiber systems guiding the lights of LEDs to each PMT. A test bench comprising fast PMTs and an one-dimensional slide platform is set up in the laboratory to test the fiber bundles. The test bench and the test procedure is described in this paper, and the test results are presented.
ISSN:1748-0221
1748-0221
DOI:10.1088/1748-0221/12/10/P10021