Assembly Device for Supermodules of Silicon Tracking System of the BM@N Experiment

V. V. Elsha,M. G. Korolev,D. V. Dementev,S. N. Igolkin, N. V. Sukhov,A. D. Sheremetev, M. O. Shitenkow, A. L. Voronin,Yu. A. Murin

Physics of Particles and Nuclei Letters（2023）

Veksler and Baldin Laboratory of High Energy Physics | Skobeltsyn Institute of Nuclear Physics | St. Petersburg University

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Abstract

The silicon tracking system of the BM@N experiment consists of four stations based on double-sided microstrip silicon sensors. The sensors make it possible to obtain a spatial resolution for tracks of secondary charged particles up to 17 μm. Two ASIC boards, the input channels of which are connected to the strips with ultralight (0.23% X 0 ) aluminum flex cables, are used to readout and process signals from both sides of the sensor. Such an assembly is called a module. Silicon sensors are mounted on lightweight carbon-fiber support trusses in a way that the dead zones at the edges are overlapped due to the tiled layout. The frontend electronics are housed in metal containers with a heat sink system located at the rare ends of the carbon-fiber support truss. A set of modules attached to the carbon-fiber support truss with two containers with readout electronics at the ends is called a supermodule. The accuracy of the sensor positioning in the station plane plays a crucial role in limiting the degrees of freedom of the parameters determined by the software during the final alignment of the tracking system elements. A special device that allows mounting sensors on a carbon fiber truss with an accuracy of up to 15 µm on a 1200 mm base is developed to assemble supermodules. The results of testing the device are given.

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Key words

Silicon Detectors,Silicon Photomultiplier

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