# Instrumentation for Colliding Beam Physics (INSTR-17)

from 27 February 2017 to 3 March 2017
Budker Institute of Nuclear Physics
Asia/Novosibirsk timezone
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# Contribution Poster

Budker Institute of Nuclear Physics
Micropattern gas detectors

# Limits of a spatial resolution of the cascaded GEM based detectors

## Speakers

• Mr. Timofei MALTSEV

## Content

Micro-pattern gaseous coordinate detectors possess a spatial resolution in ten micron scale together with high rate capability up to 10$^{7}$ cm$^{-2}$ s$^{-1}$. Another advantage of these detectors is an essentially lower cost per unit area in comparison with the semiconductor detectors. Cascaded Gas Electron Multiplier (GEM) based detectors belong to the micro-pattern gaseous detector class. They are widely used in numerous collider experiments and in particular, at the Budker Institute of Nuclear Physics (BINP). Thus, limit values of spatial resolution, achieved by these detectors, are of significant interest. In order to determine the limit spatial resolution the simulation of charged particle registration process was accomplished. The simulation of applied detector configurations include HEED based transport of 1 GeV energy electrons through the detector and Garfield++ based tracking of avalanche evolution inside working volume, filled with the gas mixture Ar(75%)–CO$_2$(25%), as well as obtaining of signal distribution on the readout strips with electronics noise being taken into account. The experimental part of the work is devoted to the operability tests of the designed detectors and the measurements of their characteristics including the registration efficiency, the material budget and the spatial resolution. The material budget measurements of GEM based detectors are important for the DEUTERON facility at the VEPP-3 storage ring, where these detectors are planned to be installed. The experiments for the measurements of the detector parameters were carried out with the extracted beam facility of VEPP-4M collider at the BINP.