  A testbeam telescope, based on ATLAS IBL silicon pixel modules, has been
built. It comprises six planes of planar silicon sensors with 250 x 50 um^2
pitch, read out by ATLAS FE-I4 chips. In the CERN SPS H8 beamline (180 GeV pi+)
a resolution of better than 8 x 12 um^2 at the position of the device under
test was achieved. The telescope reached a trigger rate of 6kHz with two
measured devices. It is mainly designed for studies using FE-I4 based
prototypes, but has also been successfully run with independent DAQ systems.
Specialised trigger schemes ensure data synchronisation between these external
devices and the telescope. A region-of-interest trigger can be formed by
setting masks on the first and the last pixel sensor planes. The setup
infrastructure provides centrally controlled and monitored high and low voltage
power supplies, silicon oil cooling, temperature and humidity sensors and
movable stages.
