Abstract
Test beam measurements at the test beam facilities of DESY have been conducted to characterise the performance of the EUDET-type beam telescopes originally developed within the EUDET project. The beam telescopes are equipped with six sensor planes using MIMOSA26 monolithic active pixel devices. A programmable Trigger Logic Unit provides trigger logic and time stamp information on particle passage. Both data acquisition framework and offline reconstruction software packages are available. User devices are easily integrable into the data acquisition framework via predefined interfaces. The biased residual distribution is studied as a function of the beam energy, plane spacing and sensor threshold. Its standard deviation at the two centre pixel planes using all six planes for tracking in a 6\,GeV electron/positron-beam is measured to be $(2.88\,\pm\,0.08)\,\upmu\meter$.Iterative track fits using the formalism of General Broken Lines are performed to estimate the intrinsic resolution of the individual pixel planes. The mean intrinsic resolution over the six sensors used is found to be $(3.24\,\pm\,0.09)\,\upmu\meter$.With a 5\,GeV electron/positron beam, the track resolution halfway between the two inner pixel planes using an equidistant plane spacing of 20\,mm is estimated to $(1.83\,\pm\,0.03)\,\upmu\meter$ assuming the measured intrinsic resolution. Towards lower beam energies the track resolution deteriorates due to increasing multiple scattering. Threshold studies show an optimal working point of the MIMOSA26 sensors at a sensor threshold of between five and six times their RMS noise. Measurements at different plane spacings are used to calibrate the amount of multiple scattering in the material traversed and allow for corrections to the predicted angular scattering for electron beams.
Highlights
Beam telescopes are vital tools for R&D projects focussing on position sensitive particle detection sensors
Within the Integrated Infrastructure Initiative funded by the EU in the 6th Framework Programme, the EUDET project [5] aimed at providing a high-resolution pixel beam telescope for test beam studies [6]
The results reported here are based on data taken with DATURA at test beam area 21 at DESY-II and are comparable to other beam telescope copies with a similar thickness of the epitaxial layer [8]
Summary
Beam telescopes are vital tools for R&D projects focussing on position sensitive particle detection sensors. The data are available to the EUDAQ framework (cf “The EUDAQ data acquisition framework” section), and an event is written to disk in normal handshake mode, only if a trigger has been raised for a certain telescope readout frame This co-development, i.e. sharing processing tasks between firmware and software, allows for high flexibility for system upgrades. Producers are the links between the EUDAQ framework and the subdetector systems such as the beam telescope, the TLU, or user DAQ systems They interface with the EUDAQ library and provide a set of commands to be called by the Run Control. The full content of the configuration file including commented lines is stored in the so-called Begin-Of-Run Event (BORE) of every run and is available later for offline analysis and reference This greatly simplifies book keeping of detector parameters during test beam shifts since all settings are stored automatically. The variance for a single scatterer ε reads [29]
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