For the
SPARC Project a novel diagnostic device, called "Emittance-meter",
has been conceived and constructed to perform a detailed study of the
emittance compensation process in the SPARC photo-injector and to optimize
the RF-gun and the accelerator working point. It consists of a movable
emittance measurement system, based on the 1D pepper-pot method, installed
between two long bellows with the possibility to scan a region 1.2 m
long downstream the RF-gun. The construction of the device was completed
in the first part of this year and a series of laboratory tests, to
evaluate its performances, were carried out in Spring 2005. At the beginning
of the summer the complete system was moved to DESY at Zeuthen to be
installed on the Photo Injector Test Facility PITZ. After the commissioning
it will used for measurements of the PITZ electron beam in the framework
of a collaboration between the SPARC and PITZ Projects aiming on studies
and operations with photo injectors.