Speaker
Description
The future circular electron-positron collider (FCC-ee)
is designed for highest luminosity to enhance the precision
of high-energy particle physics experiments, spanning en-
ergies from the Z pole to the t$\bar{\text{t}}$ threshold. As outlined in
its conceptual design report, high-precision measurements
of the longitudinal bunch profile are required across mul-
tiple operation modes, which presents key challenges for
beam instrumentation. As part of the feasibility study, a
concept for an electro-optical (EO) bunch profile monitor
has been developed to address these challenges, building on
the existing EO beam diagnostic at the Karlsruhe Research
Accelerator (KARA) at KIT.
The first EO monitor prototype for FCC-ee features a
novel crystal-holder design using prisms, enabling a single-
pass setup crucial for measuring the long bunches during Z
operation. This contribution presents the first measurement
results of the EO monitor prototype for FCC-ee, which were
obtained in the in-air test stand at the CERN Linear Electron
Accelerator for Research (CLEAR).
