  Optics for future X-ray telescopes will be characterized by very large
aperture and focal length, and will be made of lightweight materials like glass
or silicon in order to keep the total mass within acceptable limits. Optical
modules based on thin slumped glass foils are being developed at various
institutes, aiming at improving the angular resolution to a few arcsec HEW.
Thin mirrors are prone to deform, so they require a careful integration to
avoid deformations and even correct forming errors. On the other hand, this
offers the opportunity to actively correct the residual deformation: a viable
possibility to improve the mirror figure is the application of piezoelectric
actuators onto the non-optical side of the mirrors, and several groups are
already at work on this approach. The concept we are developing consists of
actively integrating thin glass foils with piezoelectric patches, fed by
voltages driven by the feedback provided by X-rays. The actuators are
commercial components, while the tension signals are carried by a printed
circuit obtained by photolithography, and the driving electronic is a
multi-channel low power consumption voltage supply developed in-house. Finally,
the shape detection and the consequent voltage signal to be provided to the
piezoelectric array are determined in X-rays, in intra-focal setup at the XACT
facility at INAF/OAPA. In this work, we describe the manufacturing steps to
obtain a first active mirror prototype and the very first test performed in
X-rays.
