A DEPFET Based Beam Telescope With Submicron Precision Capability

For the detection of secondary vertices of long lived particles containing bottom and charm quarksat the International Linear Collider(ILC), a DEPFET pixeldetector is one of the technologically favored options. In a DEPFET sensor a MOSFET pixeldetector is integrated on a sidewards depleted silicon bulk sensor, thus combining the advantages of a fully depleted silicon sensor with in- pixelamplification. DEPFET pixelmatrices have been characterized in a high energy particle beam. Since the DEPFET is a very high precision device, given its large S/N (> 100) and small pixelsize (36 × 22 ?m 2 ), a DEPFET based pixeltelescope consisting of 5 DEPFETs has been developed. The uncertainty on the predicted position for a device under test(DUT) positioned inside the telescope was found to be 1.4 ?m with the existing device, due to the limited performance of two of the five DEPFET planes. A DEPFET telescope built of 5 modules equivalent to the best plane presented here, would have a track extrapolation error as low as 0.65 ?m at the DUT plane.