2019, Zadeba, E. A., Borisov, A. A., Fakhrutdinov, R. M., Ivanov, S. S., Kokoulin, R. P., Kompaniets, K. G., Kozhin, A. S., Petrukhin, A. A., Vorobyev, V. S., Yashin, I. I., Задеба, Егор Александрович, Борисов, Анатолий Андреевич, Фахрутдинов, Ринат Макаримович, Кокоулин, Ростислав Павлович, Компаниец, Константин Георгиевич, Кожин, Анатолий Сергеевич, Петрухин, Анатолий Афанасьевич, Воробьев, Владислав Станиславович, Яшин, Игорь Иванович

© Published under licence by IOP Publishing Ltd.The new coordinate-tracking detector based on drift chambers (CTUDC) is created in MEPhI. The detector represents two planes with total area of 30 m2 placed on the opposite sides of Cherenkov water detector of 2000 m3 volume. Each plane consists of 8 large multiwire drift chambers (4000x508x112 mm3). The key advantages of these chambers are a large effective area (1.85 m2) and a good coordinate and angular resolution with a small number of measuring channels. From the beginning of 2017, CTUDC operates as a part of the experimental complex NEVOD. The detector is designed for measuring of high density muon bundles (up to 10 particles per m2) at zenith angles in the range from 30° to 90°. The results of the CTUDC operation during the last year are given, the first distributions of the events in zenith angle, muon bundle multiplicity and density obtained from the detector data are discussed.

2020, Vorobyev, V. S., Borissov, A. A., Kozhin, A. S., Kompaniets, K. G., Fakhrutdinov, R. M., Zadeba, E. A., Воробьев, Владислав Станиславович, Кожин, Анатолий Сергеевич, Компаниец, Константин Георгиевич, Фахрутдинов, Ринат Макаримович, Задеба, Егор Александрович

The new large-scale coordinate-tracking detector TREK is under construction in MEPhI. It is based on 264 multi-wire drift chambers (4000 x 508 x 112 mm(3) size) developed in IHEP for experiments on the neutrino channel of the U-70 accelerator, and will have 250 m(2) of continuous effective area. The main goal 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. Besides of a set of field-forming wires, each multi-wire drift chamber has 4 signal ones. The current from these wires is processed by the shaper-amplifier AMP-4, mounted on the front of the chamber. It generates LVDS pulses that should be processed by multi-channel TDC that faces two main requirements: large matching window (more than 6000 ns) with last significant digit (LSD) less than 10 ns and capability to hold more than 50 hits per channel in a single event. These conditions were fulfilled by the new time-to-digital converter developed on the basis of Cyclone V FPGA in MEPhI. This paper presents the design of the TDC, its main features and the first benchmarks of its performance.