Very high energy calibration of silicon Timepix detectors
| Autor: | Lawrence Pinsky, T. Campbell-Ricketts, Satoshi Kodaira, Lukas Tlustos, Edward Semones, S. Wheeler, Hisashi Kitamura, Nicholas Stoffle, S. P. George, M. Kroupa |
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| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Physics
Silicon Pixel 010308 nuclear & particles physics business.industry Physics::Instrumentation and Detectors Detector chemistry.chemical_element Cosmic ray Electron 01 natural sciences Power law 030218 nuclear medicine & medical imaging Front and back ends 03 medical and health sciences 0302 clinical medicine Optics chemistry 0103 physical sciences Polar coordinate system Detectors and Experimental Techniques business Instrumentation Mathematical Physics |
| Popis: | We investigate energy measurements in Timepix hybrid detectors in hole collection mode above pixel input energy depositions of about 2.2 MeV or 600,000 electron/hole pairs in Silicon. Measurement of the detector response well above this regime is important for our application measuring the heavy ion exposure of NASA astronauts. We find that high input charges produce a double pulse structure in the Timepix front end which creates a taxonomy of different clusters which are observed at accelerators, but not in typical operation on orbit. We investigate the LET response of the Timepix to different heavy ion species and find that for a given polar angle the so called 'volcano effect' can be compensated with a simple power law model. We also characterize the pixel response of the Timepix using mono-energetic stopping protons and derive a per pixel calibration method for correction of the pixel response up to about 8 MeV. We conclude that with an appropriate calibration procedure the Timepix can correctly measure the LET values in excess of 500 keV μm-1 in Silicon for tracks with a polar angle exceeding 60o, corresponding to the entirety of the cosmic ray spectrum up to Nickel. |
| Databáze: | OpenAIRE |
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