We are presenting a drift chamber composed from three layers of mylar drift tubes with outer diameter 15 mm. The pipe is made of strip of mylar film 125 micrometers thick covered with aluminium from the both sides. A strip of mylar is wrapped around the mandrel. Pipe is created by ultrasonic welding. A single drift tube is self-supported structure withstanding 350 g wire tension without supports and internal overpressure. About 400 such tubes were assembled. Design, quality control procedures of the drift tubes are described. Seven chambers were glued from these tubes of 560 mm length. Each chamber consists of 3 layers, 16 tubes per layer. Several chambers were tested with cosmic rays. Results of the tests, counting rate plateau and coordinate resolution are presented.

The data-acquisition system of a muon tomograph based on the on-chamber electronics is described. Its advantages over the previously used system based on the electronics made to the VME-9U standard are considered. The hardware component and the software of the new data-acquisition system are presented.

The on-chamber electronic system of a muon tomograph is described. The system is composed of an MT-48 48-channel front-end module and an RMT-48 fan-out module for the multiplication of control signals. The data-acquisition structure for the Muon Tomograph device is presented.

Описана система накамерной электроники мюонного томографа: 48-канальный регистрирующий модуль МТ-48 и разветвитель сигналов канала управления РМТ-48. Приведена организация сбора информации установки “Мюонный томограф”.

Описана конструкция дрейфовой камеры, состоящей из трех слоев тонкостенных (0.125 мм) прецизионных лавсановых трубок. Двадцать шесть таких камер площадью от 1 ? 1 до 2.5 ? 2 м2, включающих 4392 дрейфовые трубки, были изготовлены для экспериментов на ускорителе ИФВЭ с энергией 70 ГэВ. Приведены описания конструкции и процедуры сборки, а также некоторые результаты проверки камер.

The design and assembling procedure of a precision drift tube housed in a Mylar pipe are described. The technology for manufacturing drift tube bodies from a 125-μm-thick Mylar film with an aluminum coating evaporated on both sides of it is introduced. The test procedures and results demonstrating the performance characteristics of the drift tubes are presented.

A structure of the data acquisition and control system (DAQC) in the MISS electronics standard for a multichannel detector on drift tubes is described. Its special feature is the use of the specialized LE-83 controller for communications with the computer and LE-83T controller-timer, which fulfills off-line all functions of storing data in its inner memory buffers in real time without an obligatory external trigger launching signal. The rewriting of stored data from the buffer into the computer memory and their transmission via the local network occur periodically in program-specified time intervals. The received data are processed on-line to control the equipment, alert, if a fault is detected, and produce physical results directly to the operator, who interacts with the system through the graphic interface with a possibility of the setup configuration. The system is built as a set of interacting processes, which can operate both on one computer or be distributed on several computers (within the frameworks of the local network).

The Muon Tomograph setup with a 3 × 3 m 2 area of overlapping is described. This setup has been designed to investigate the feasibility of detecting hidden objects with different densities using cosmic muons. Its main performance characteristics are presented.

Muon tomography, based on the measurement of multiple scattering of cosmic ray muons traversing a volume to be investigated, is an attractive technique for detecting hidden high-Z materials. A cosmic ray muon tomograph with sensitive volume of 3m × 3m × 2.5m has been constructed at IHEP (Protvino) and is under producing first data and results. The description and characteristics of the setup are presented. The tomograph is built of 30 mm drift tubes operating in trigger-less mode. Tubes are filled with an Ar-CO 2 mixture and can operate for about one year without refreshing of the gas-mixture. Specialized track reconstruction, tomographic reconstruction and visualization tools were developed. Image reconstruction examples are presented.