Feb 18 – 22, 2019
Vienna University of Technology
Europe/Vienna timezone

Luminometers for Future Linear Collider Experiments

Not scheduled
Vienna University of Technology

Vienna University of Technology

Gusshausstraße 27-29, 1040 Wien
Board: 9
Poster Calorimeters Poster Session B


Dr Veta Ghenescu (Institute of Space Science (RO))


The FCAL collaboration develops fast, compact calorimeters to measure
the luminosity of electron-positron collisions with high precision
using small angle Bhabha scattering, and bunch-by-bunch using beamstrahlung
pairs. Searches for new physics also require the detection of high
energy electrons at low angles. Several sensor options, such as GaAs
or single crystal sapphire, are under consideration in addition to
conventional silicon diode sensors, all of which are being assessed
for radiation tolerance.

A small Moliere radius facilitates the measurement of Bhabha events in
the presence of background and allows the detection of single high energy
electrons on top of the diffuse pair background. A multi-plane prototype
compact luminometer was studied in a 5 GeV electron beam at DESY. The
results for the longitudinal and transverse shower profiles are compared
with Geant4 simulations and used to determine the effective Moliere
radius of the prototype, which approaches the technological limit.

A multi-channel low-power readout ASIC is under development
in 130nm CMOS, comprising an analog front-end and fast 10-bit ADC in each
channel, followed by fast serialization and data transmission. In addition,
an ASIC with a dual readout scheme for BeamCal allowing for a fast feedback
to the accelerator and simultaneous data taking and calibration is under

Primary author

Dr Veta Ghenescu (Institute of Space Science (RO))

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