The HERMES Technologic and Scientific Pathfinder will include a siswich detector, which is capable of performing spectroscopy in the range from 2 keV to 2 MeV as a single monolithic detector. To do this, the siswich combines a solid-state Silicon Drift Detector and a scintillator crystal. However, a spectroscopic calibration pipeline has not been standardized yet for these instruments. In this work, we present the newly developed HERMES calibration pipeline, mescal, which is intended for laboratory on-ground raw HERMES data energy calibration and formatting. This software is designed to minimize user interaction, thus including an automatic calibration line identification, and an automatic linear, independent calibration for each pixel in both operating modes. The mescal pipeline can set the basis for similar applications in future siswich telescopes.
Compton polarimeters are typically designed to be sensitive only to the azimuthal angle of the scattered photon, ignoring the scattering angle. Such a 2-dimensional reconstruction of the event is pursued for both simplicity and because the polarization of the incident photon influences only the azimuthal response of the instrument. While this is true for on-axis sources, when the source starts to be off-axis of several degrees the azimuthal response of the instrument is effectively a convolution of the azimuthal and polar scattering angles: measuring the latter would provide a better sensitivity and smaller systematic effects. In this contribution, we will present a design which allows to estimate the scattering angle in a Compton polarimeter through the read-out of the light signal at the two ends of scintillator bars. Such a design is being tested with a representative set-up and first results on the performance are presented.
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