Performance of X-ray facility for calibration of the Jem-X instrument aboard the INTEGRAL satellite

We report preliminary results on the performance of the X-ray apparatus built to calibrate the X-ray monitor Jem-X aboard the INTEGRAL satellite for gamma-ray astronomy. Jem-X is based on a position sensitive xenon detector operative from 3 to 60 KeV. It will make use of coded masks to get imaging capabilities. The X-ray apparatus allows to scan the X-ray detector with a monochromatic beam obtained with the use of a double crystal diffractometer. The current energy range of the beam can be chosen from about 10 KeV to 120 KeV while its direction is fixed independently on the photon energ