Ponente
Descripción
Highly compact, granular electromagnetic calorimeters are necessary for luminometers in experiments at electron-positron colliders, as well as for measuring positron multiplicity and energy distribution in the laser-electron scattering experiment LUXE, which investigates strong-field QED. In the former, Bhabha scattering is used as a gauge process. Using a highly compact calorimeter, i.e., with a small Moli`{e}re radius, the fiducial volume is well defined, and the required space is relatively small. In addition, the measurement of the shower of a high-energy electron on top of a widely spread low-energy background is improved.
In the laser-electron scattering case, the number of secondary electrons and positrons per bunch crossing varies over a wide range, and both the determination of the number of electrons and positrons and their energy spectrum per bunch crossing favour a highly compact calorimeter.
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 with a total area of about, structured into pads, flexible Kapton printed-circuit planes for bias-voltage supply and signal transport to the sensor edge, all embedded in a carbon fibre support.
Each sensor plane is read out by front-end (FE) ASICs called FLAME (Fcal Asic for Multiplane REadout), positioned at the edges of the sensor. FLAME comprises an analogue FE and a 10-bit ADC in each channel, followed by a fast data serialiser.
In standard readout mode, fast deconvolution is performed in the FPGA using a procedure that.
An aluminium mechanical holds very precisely manufactured tungsten plates of about 555x 100 x 35 mm^3. The current stack was instrumented with 11 plates and 11 sensor planes, each consisting of two adjacent sensors. Preliminary results on the performance will be reported.
