Ricerc@Sapienza

Strip line Beam Positions Monitors (BPMs) are the main
devices used for non-intercepting position measurement for
the electron LINAC of ELI-NP (Extreme Light Infrastructure
- Nuclear Physics). All the 29 BPMs have the same
design, with the exception of the one installed in one of the
dump line, which has a much larger acceptance than the
others. BPMs will also be used to measure the charge of
the beam, by measuring the sum of the pickups signals and
calibrating it with beam charge monitors installed along the
LINAC. An analytical model has been developed for the
proposed BPMs. This model has been checked by means of
electromagnetic simulations, in order to obtain the pickups
signals at the passage of the beam and to study the effects of
BPMs non-linearities, particularly on charge measurements.
Details of the analytical model, results of the numerical simulations
and the correction algorithm proposed for charge
measurements are described in this paper.