Speaker
Description
LUXE experiment: For the measurements of positrons, a tracker and an
electromagnetic calorimeter are foreseen. Since the expected number of positrons
varies over five-orders of magnitude, and has to be measured over a widely spread
low energy background, the calorimeter must be compact and finely segmented. The
concept of a sandwich calorimeter made of tungsten absorber plates interspersed
with thin sensor planes is developed. The sensor planes comprise a silicon pad
sensor, flexible Kapton printed circuit planes for bias voltage supply and signal
transport to the sensor edge, all embedded in a carbon fibre support. A dedicated readout is developed comprising
front-end ASICs in 130 nm technology and FPGAs to orchestrate the ASICs. As an alternative, GaAs are considered with integrated
readout strips on the sensor. Both prototypes are studied in an
electron beam of 5 GeV. Results will be presented on the homogeneity of the
response, edge effects and cross-talk between channels.
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