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A Compton polarimeter using scintillators read out with MPPCs through Citiroc ASIC
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.ORCID iD: 0000-0001-5191-9306
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
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2019 (English)In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, ISSN 0168-9002, E-ISSN 1872-9576, Vol. 943, article id 162376Article in journal (Refereed) Published
Abstract [en]

In recent years, a number of purpose-built scintillator-based polarimeters have studied bright astronomical sources for the first time in the hard X-ray band (tens to hundreds of keV). The addition of polarimetry can help data interpretation by resolving model-dependent degeneracies. The typical instrument approach is that incident X-rays scatter off a plastic scintillator into an adjacent scintillator cell. In all missions to date, the scintillators are read out using traditional vacuum tube photo-multipliers (PMTs). The advent of solid-state PMTs (“silicon PM” or “MPPC”) is attractive for space-based instruments since the devices are compact, robust and require a low bias voltage. We have characterised the plastic scintillator, EJ-248M, optically coupled to a multi-pixel photon counter (MPPC) and read out with the Citiroc ASIC. A light-yield of 1.6 photoelectrons/keV has been obtained, with a low energy detection threshold of ≲5 keV at room temperature. We have also constructed an MPPC-based polarimeter-demonstrator in order to investigate the feasibility of such an approach for future instruments. Incident X-rays scatter from a plastic-scintillator bar to surrounding cerium-doped GAGG (Gadolinium Aluminium Gallium Garnet) scintillators yielding time-coincident signals in the scintillators. We have determined the polarimetric response of this set-up using both unpolarised and polarised ∼50 keV X-rays. We observe a clear asymmetry in the GAGG counting rates for the polarised beam. The low-energy detection threshold in the plastic scintillator can be further reduced using a coincidence technique. The demonstrated polarimeter design shows promise as a space-based Compton polarimeter and we discuss ways in which our polarimeter can be adapted for such a mission.

Place, publisher, year, edition, pages
Elsevier, 2019. Vol. 943, article id 162376
Keywords [en]
Compton polarimetry, GAGG, Gamma/X-ray detector, MPPC, Plastic scintillator, Scintillator, Application specific integrated circuits, Electron tubes, Ellipsometry, Ionization, Phosphors, Photomultipliers, Photons, Polarimeters, X rays, Astronomical sources, Coincidence techniques, Multi-pixel photon counters, Purpose built scintillators, Scintillation counters
National Category
Accelerator Physics and Instrumentation
Research subject
Physics, Atomic, Subatomic and Astrophysics
Identifiers
URN: urn:nbn:se:kth:diva-263519DOI: 10.1016/j.nima.2019.162376ISI: 000504926900001Scopus ID: 2-s2.0-85070208746OAI: oai:DiVA.org:kth-263519DiVA, id: diva2:1374273
Note

QC 20191204

Available from: 2019-11-29 Created: 2019-11-29 Last updated: 2020-01-22Bibliographically approved

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Kushwah, RakheeIyer, NirmalKiss, MózsiStana, Theodor-AdrianPearce, Mark

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Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Accelerator Physics and Instrumentation

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