Studies of MCP-PMTs in the miniTimeCube neutrino detector

Li, Viacheslav A.; Koblanski, J.; Dorrill, R.; Duvall, M.J.; Engel, Kristi; Jocher, Glenn; Learned, J. G.; Matsuno, S.; McDonough, William F.; Mumm, H. P.; Negrashov, S.; Nishimura, K.; Rosen, M.; Sakai, M.; Usman, S.M.; Varner, G.; Wipperfurth, Scott A.

doi:10.1063/1.5043308

Cited by 2 publications

(2 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Additionally, a broad Gaussian distribution on the accidental coincidence events can be seen. The distribution is caused by events where photoelectrons are scattered backward at the MCP surface (Korpar et al 2008, Li et al 2018. The transit time of the backscattered photoelectron is broadened, resulting in the broad Gaussian distribution.…”

Section: Timing Histogram Of a Pair Of Crismentioning

confidence: 99%

Precise analysis of the timing performance of Cherenkov-radiator-integrated MCP-PMTs: analytical deconvolution of MCP direct interactions

et al. 2020

View full text Add to dashboard Cite

In order to achieve the ultimate goal of reducing coincidence time resolution (CTR) to 10 ps, thus enabling reconstruction-less positron emission tomography, a Cherenkov-radiator-integrated microchannel plate photomultiplier tube (CRI) reaching CTR of sub-50 ps full width at half maximum (FWHM) has been developed. However, a histogram of time differences between a pair of the CRIs shows undesirable side peaks, which are caused by gamma rays directly interacting with the micro channel plates (MCPs). Such direct interaction events are detrimental to the timing performance of the CRI. In this paper, we demonstrate an analytical method of deconvolving MCP direct interaction events from the timing histogram. Considering the information of the main and the two side peaks, the timing uncertainty caused by the MCP direct interaction events is deconvolved and the CTR of the CRI is analytically investigated. Consequently, the CTR is improved from 41.7 to 40.5 ps FWHM by the deconvolution. It means that a mixture of the Cherenkov radiator events and the MCP direct interaction events contribute to the CTR by a factor of 10 ps. The timing performance of the MCP direct interaction events are also evaluated. The CTR between the two MCPs is found to be 66.2 ps FWHM. This indicates that a photocathode-free radiation detector with high timing performance is possible. Elimination of the photocathode from the detector would make detector construction easier and more robust.

show abstract

Section: Timing Histogram Of a Pair Of Crismentioning

confidence: 99%

Precise analysis of the timing performance of Cherenkov-radiator-integrated MCP-PMTs: analytical deconvolution of MCP direct interactions

et al. 2020

View full text Add to dashboard Cite

show abstract

“…This happens due to the so-called charge sharing effect, when the electron shower induces signals simultaneously on two anode electrodes, see e.g. [56][57][58]. We observe that charge sharing happens at the distance of 1-2 mm from the pad edge.…”

Section: Pmt Time Resolutionmentioning

confidence: 73%

Fast and efficient detection of 511 keV photons using Cherenkov light in PbF₂ crystal, coupled to a MCP-PMT and SAMPIC digitization module

et al. 2019

View full text Add to dashboard Cite

A: We study the possibility to use the Cherenkov light for the efficient detection of 511 keV photons with the goal to use it in TOF-PET. We designed and tested two detection modules consisting of PbF 2 crystals attached to Planacon MCP-PMT XP85012. Amplified PMT signals are digitized by the SAMPIC module with high readout rate, up to 10 5 events/s, and a negligible contribution to the time resolution, below 20 ps (FWHM). We developed a fast 2D scanning system to calibrate the PMT time response and studied in details the timing characteristics of the Planacon PMT.Using a radioactive 22 Na source we measured a detection efficiency of 24% for 511 keV photons in a 10 mm thick crystal and a coincidence resolving time of 280 ps. We analyzed the main factors limiting the time resolution of the large-surface detection module and proposed solutions to improve it, which will be tested in our future project.

show abstract

Studies of MCP-PMTs in the miniTimeCube neutrino detector

Abstract: This report highlights two different types of cross-talk in the photodetectors of the miniTimeCube neutrino experiment. The miniTimeCube detector has 24 8 × 8-anode Photonis MCP-PMT Planacon XP85012, totalling 1536 individual pixels viewing the 2-liter cube of plastic scintillator.

Cited by 2 publications

References 3 publications

Precise analysis of the timing performance of Cherenkov-radiator-integrated MCP-PMTs: analytical deconvolution of MCP direct interactions

Precise analysis of the timing performance of Cherenkov-radiator-integrated MCP-PMTs: analytical deconvolution of MCP direct interactions

Fast and efficient detection of 511 keV photons using Cherenkov light in PbF₂ crystal, coupled to a MCP-PMT and SAMPIC digitization module

Contact Info

Product

Resources

About

Studies of MCP-PMTs in the miniTimeCube neutrino detector

Abstract: This report highlights two different types of cross-talk in the photodetectors of the miniTimeCube neutrino experiment. The miniTimeCube detector has 24 8 × 8-anode Photonis MCP-PMT Planacon XP85012, totalling 1536 individual pixels viewing the 2-liter cube of plastic scintillator.

Cited by 2 publications

References 3 publications

Precise analysis of the timing performance of Cherenkov-radiator-integrated MCP-PMTs: analytical deconvolution of MCP direct interactions

Precise analysis of the timing performance of Cherenkov-radiator-integrated MCP-PMTs: analytical deconvolution of MCP direct interactions

Fast and efficient detection of 511 keV photons using Cherenkov light in PbF2 crystal, coupled to a MCP-PMT and SAMPIC digitization module

Contact Info

Product

Resources

About

Fast and efficient detection of 511 keV photons using Cherenkov light in PbF₂ crystal, coupled to a MCP-PMT and SAMPIC digitization module