Intrinsic resolutions of DEPFET detector prototypes measured at beam tests

Abstract The paper is based on the data of the 2009 DEPFET beam test at CERN SPS. The beam test used beams of pions and electrons with energies between 40 and 120 GeV, and the sensors tested were prototypes with thickness of 450 μ m and pixel pitch between 20 and 32 μ m . Intrinsicresolutions of the detectors are calculated by disentangling the contributions of measurement errors and multiple scattering in tracking residuals. Properties of the intrinsicresolution estimates and factors that influence them are discussed. For the DEPFET detectors in the beam test, the calculation yields intrinsicresolutions of ≈ 1 μ m , with a typical accuracy of 0.1 μ m . Bias scan, angle scan, and energy scan are used as example studies to show that the intrinsicresolutions are a useful tool in studies of detector properties. With sufficiently precise telescopes, detailed resolution maps can be constructed and used to study and optimize detector performance.