The new large-scale coordinate-tracking detector TREK is being developed at National Research University MEPhI. The aim of the project is the solution of so-called “muon puzzle”: the unpredicted by any theory excess of high multiplicity muon bundles generated by ultra-high energy primary cosmic rays. The joint operation with Cherenkov water detector NEVOD will allow investigation specific energy deposit of quasi-parallel inclined muon bundles generated by high energy cosmic rays in 2000 m3 water volume.
The detector TREK has an area of 250 m2 and it is based on 264 multi-wire drift chambers developed at Institute of High Energy Physics for neutrino experiment at accelerator U-70. The drift chamber has size 4000×508×112 mm3. TREK will consist of 2 planes (vertical and horizontal) with 132 chambers for each. The total area of installation is about 250 m2.
The drift chambers were tested with a joint operation with muon hodoscope URAGAN. Two prototypes of TREK were constructed, their operation demonstrated high efficiency of application of such gaseous detectors for cosmic ray investigations. The experiments on URAGAN has allowed us to investigate drift chamber work in different positions, CTUDC has allowed to test joint work of chambers with NEVOD and prototype of TREK has allowed to test multiparticle event reconstruction taking into account the relative location of chambers as in TREK installation.
Three reconstruction methods of multiparticle events have been developed. The methods have been tested on experimental data of CTUDC and prototype of TREK. A new reconstruction method based on deep learning is being developed. Also a time-digital converter based on FPGA Altera Cyclone V is being developed for TREK installation. The report describes the current status of detector TREK.