Abstract
Detector-plane prototypes of the very forward calorimetry of a future detector at an e+e− collider have been built and their performance was measured in an electron beam. The detector plane comprises silicon or GaAs pad sensors, dedicated front-end and ADC ASICs, and an FPGA for data concentration. Measurements of the signal-to-noise ratio and the response as a function of the position of the sensor are presented. A deconvolution method is successfully applied, and a comparison of the measured shower shape as a function of the absorber depth with a Monte-Carlo simulation is given.
Highlights
Future e+e− colliders offer a rich experimental program that addresses many open issues in elementary particle physics
For the International Linear Collider (ILC), two types of detectors are under design, the International Large Detector (ILD) [4] and the Silicon Detector (SiD) [5]
The Beam Calorimeter (BeamCal) will perform a bunch-by-bunch estimate of the luminosity and, supplemented by a pair monitor, assist beam tuning when included in a fast feedback system [8]
Summary
Future e+e− colliders offer a rich experimental program that addresses many open issues in elementary particle physics. The BeamCal will perform a bunch-by-bunch estimate of the luminosity and, supplemented by a pair monitor, assist beam tuning when included in a fast feedback system [8]. LumiCal covers polar angles between 31 and 77 mrad and BeamCal, between 5 and 40 mrad Both calorimeters consist of 3.5 mm-thick tungsten absorber disks, each corresponding to around one radiation length, interspersed with sensor layers. The lower polar-angle range of BeamCal is exposed to a large flux of low energy electrons, resulting in depositions up to one MGy for a total integrated luminosity of 500 fb−1 at 500 GeV. Results of their performance following tests in an electron beam are reported
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