Abstract
The large-scale coordinate-tracking detector TREK for registration of inclined EAS is being developed in MEPhI. The detector is based on multiwire drift chambers from the neutrino experiment at the IHEP U-70 accelerator. Their key advantages are a large effective area (1.85 m 2 ), a good coordinate and angular resolution with a small number of measuring channels. The detector will be operated as part of the experimental complex NEVOD, in particular, jointly with a Cherenkov water detector (CWD) with a volume of 2000 cubic meters and the coordinate detector DECOR. The first part of the detector named Coordinate-Tracking Unit based on the Drift Chambers (CTUDC), representing two coordinate planes of 8 drift chambers in each, has been developed and mounted on opposite sides of the CWD. It has the same principle of joint operation with the NEVOD-DECOR triggering system and the same drift chambers alignment, so the main features of the TREK detector will be examined. Results of the CTUDC development and a joint operation with NEVOD-DECOR complex are presented.
Highlights
The aim of the large-scale coordinate-tracking detector is solving the problem of the excess of muon bundles that increases with the energy of the primary cosmic rays [1, 2], that can be caused by both cosmo- or nuclear-physical reasons [3]
Such studies are performed at the experimental complex NEVOD-DECOR [4]; the coordinate detector DECOR does not cover the entire aperture of the Cherenkov water detector (CWD) and does not exclude the possibility of several muons passing between the individual supermodules of the detector
The coordinate-tracking unit based on drift chambers (CTUDC) consists of two vertical coordinate planes installed at different sides of the CWD in the short galleries of the third floor of the NEVOD building, one floor above the DECOR supermodules (Fig. 1)
Summary
The aim of the large-scale coordinate-tracking detector is solving the problem of the excess of muon bundles that increases with the energy of the primary cosmic rays [1, 2], that can be caused by both cosmo- or nuclear-physical reasons [3]. The only characteristic that responds differently to changes in the composition of cosmic rays and the inclusion of new physical processes is the energy of the muon component of extensive air showers [3] which, up to now, has not been investigated enough. Such studies are performed at the experimental complex NEVOD-DECOR [4]; the coordinate detector DECOR does not cover the entire aperture of the Cherenkov water detector (CWD) and does not exclude the possibility of several muons passing between the individual supermodules of the detector. The new coordinate-tracking detector [5] based on drift chambers will increase the coverage of the side aperture of the Cherenkov water detector NEVOD and significantly improve the resolution of close tracks
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