Implementation of configurable FEI4 trigger plane for the AIDA telescope

Tracking detectors in particle physics experiments allow a precise reconstruction of particle tracks close to the interaction point and the identification of primary and secondary decay vertices. In order to evaluate the performance of detector prototypes for future particle physics experiments — at hadron colliders (e.g. HL-LHC), flavour factories (e.g. SuperKEKB) or a future lepton collider (e.g. ILC) — under realistic conditions, a fast readout reference device, a telescope, with excellent resolution and modular configuration, is required. The successful development of a telescope with these characteristics was part of the EU-project EUDET, which is continued within the framework of the AIDA activity. One key addition to the telescope within AIDA is the implementation of at least one new reference plane dedicated to provide an adjustable geometry. This plane is realized with a hybrid pixel detector consisting of a sensor bump bonded to the ATLAS pixel readout chip FE-I4. Its masking capability allows the definition of a user-defined region-of-interest (ROI) trigger area, that can be tuned to match the area defined by the device under test (DUT). Such a flexible setup is presented and the operation is demonstrated using a DEPFET pixel sensor as DUT in between the two telescope arms. The data acquisition (DAQ) for this small area DUT is improved in terms of trigger efficiency by more than a factor of three with respect to the standard telescope configuration. The integration of the DUT into the telescope and the online results obtained with it using the ROI trigger will be shown.