Ricerc@Sapienza

A high brightness electron Linac is being built in the
Compton Gamma Source at the ELI Nuclear Physics facility
in Romania. To achieve the design luminosity, a train of 32
bunches, 16 ns spaced, with a nominal charge of 250 pC will
collide with the laser beam in the interaction point. Electron
beam spot size is measured with optical transition radiation
(OTR) profile monitors.
Furthermore, OTR angular distribution strongly depends
on beam energy. Since OTR screens are typically placed in
several positions along the Linac to monitor beam envelope,
one may perform a distributed energy measurement along
the machine. This will be useful, for instance, during the
commissioning phase of the GBS in order to verify the correct
functionality of the C-Band accelerating structures, due
to the fact that there are OTR screens after each accelerating
module.
This paper deals with the studies of different optic configurations
to achieve the field of view, resolution and accuracy
in order to measure the energy of the beam. Several configurations
of the optical detection line will be studied with
simulation tools (e.g. Zemax).