Compact LumiCal prototype tests for future $e^{+}{e}^{-}$ colliders

Abstract

The FCAL collaboration is preparing large-scale prototypes of special calorimeters to be used in the very forward region at future electron-positron colliders for instant luminosity measurement and a precise measurement of integrated luminosity and for assisting beam-tuning. LumiCal is designed as silicon-tungsten sandwich calorimeter with very thin sensor planes to keep the Molière radius small, thus facilitating the measurement of electron showers in the presence of background. Dedicated FE electronics has been developed to match the timing and dynamic range requirements. A partially instrumented prototype was investigated in a 1 to 5 GeV electron beam at the DESY II synchrotron. In the recent beam tests, a multi-plane compact prototype equipped with thin detector planes fully assembled with readout electronics were installed in 1 mm gaps between tungsten plates of one radiation length thickness. High statistics data were used to perform sensor alignment, and to measure the longitudinal and transversal shower development. In addition, Geant4 MC simulations were done and compared to the data.

5 pages, 8 figures, 1 table, PSD12 conference

References in corpus (5)

• The International Linear Collider
• Updated baseline for a staged Compact Linear Collider
• Investigation of a direction sensitive sapphire detector stack at the 5 GeV electron beam at DESY-II
• Measurement of shower development and its Molière radius with a four-plane LumiCal test set-up
• Updated Results of a Solid-State Sensor Irradiation Study for ILC Extreme Forward Calorimetry