Techniques for precise energy calibration of particle pixel detectors

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dc.contributor.author Kroupa, M.
dc.contributor.author Campbell-Ricketts, T.
dc.contributor.author Bahadori, Amir A.
dc.contributor.author Empl, A.
dc.date.accessioned 2017-03-17T21:31:23Z
dc.date.available 2017-03-17T21:31:23Z
dc.identifier.uri http://hdl.handle.net/2097/35290
dc.description Citation: M. Kroupa et al., Review of Scientific Instruments 88, 033301 (2017); doi: http://dx.doi.org/10.1063/1.4978281
dc.description.abstract We demonstrate techniques to improve the accuracy of the energy calibration of Timepix pixel detectors, used for the measurement of energetic particles. The typical signal from such particles spreads among many pixels due to charge sharing effects. As a consequence, the deposited energy in each pixel cannot be reconstructed unless the detector is calibrated, limiting the usability of such signals for calibration. To avoid this shortcoming, we calibrate using low energy X-rays. However, charge sharing effects still occur, resulting in part of the energy being deposited in adjacent pixels and possibly lost. This systematic error in the calibration process results in an error of about 5% in the energy measurements of calibrated devices. We use FLUKA simulations to assess the magnitude of charge sharing effects, allowing a corrected energy calibration to be performed on several Timepix pixel detectors and resulting in substantial improvement in energy deposition measurements. Next, we address shortcomings in calibration associated with the huge range (from kiloelectron-volts to megaelectron-volts) of energy deposited per pixel which result in a nonlinear energy response over the full range. We introduce a new method to characterize the non-linear response of the Timepix detectors at high input energies. We demonstrate improvement using a broad range of particle types and energies, showing that the new method reduces the energy measurement errors, in some cases by more than 90%. en_US
dc.language.iso en_US en_US
dc.relation.uri http://dx.doi.org/10.1063/1.4978281 en_US
dc.rights Published by AIP Publishing. This Item is protected by copyright and/or related rights. You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s). en_US
dc.rights.uri http://www.sherpa.ac.uk/romeo/issn/0034-6748/
dc.subject Calibration en_US
dc.subject Radiation detectors en_US
dc.subject Protons en_US
dc.subject Silicon detectors en_US
dc.subject Photons en_US
dc.title Techniques for precise energy calibration of particle pixel detectors en_US
dc.type Article (author version) en_US
dc.date.published 2017 en_US
dc.citation.doi 10.1063/1.4978281 en_US
dc.citation.eissn 1089-7623 en_US
dc.citation.issn 0034-6748 en_US
dc.citation.issue 033301 en_US
dc.citation.jtitle Review of Scientific Instruments en_US
dc.citation.volume 88 en_US
dc.contributor.authoreid bahadori en_US


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