New neutron detections

Osipenko, M.

doi:10.22323/1.266.0023

Cited by 2 publications

(2 citation statements)

References 16 publications

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“…/1 MeV), which is only 30% worse than the best resolution found in Ref. [19] with amplifiers directly connected to the diamond detectors. But it is an order of magnitude better than in Ref.…”

Section: Energy Deposited In Ch2 [Mevmentioning

confidence: 55%

Upgrade of the compact neutron spectrometer for high flux environments

Osipenko

Bellucci

Ceriale

et al. 2018

Nuclear Instruments and Methods in Physics Research Section A:

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In this paper a new version of 6 Li-based neutron spectrometer for high flux environments is described. The new spectrometer was built with commercial single crystal Chemical Vapour Deposition diamonds of electronic grade. These crystals feature better charge collection as well as higher radiation hardness.Ohmic metal contacts were deposited on the diamonds suppressing build-up of space charge observed in the previous prototypes. New passive preamplification of signal at detector side was implemented to improve the resolution. This preamplification is based on RF transformer not sensitive to high neutron flux.Compact mechanical design allowed to reduce detector size to a tube of 1 cm diameter and 13 cm long. The spectrometer was tested in thermal column of TRIGA reactor and at DD neutron generator. The test results indicate an energy resolution of 72 keV (RMS) and coincidence timing resolution of 68 ps (RMS). The measured data are in agreement with Geant4 simulations except for larger energy loss tail presumably related to imperfections of metal contacts and glue expansion.

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Section: Energy Deposited In Ch2 [Mevmentioning

confidence: 55%

Upgrade of the compact neutron spectrometer for high flux environments

Osipenko

Bellucci

Ceriale

et al. 2018

Nuclear Instruments and Methods in Physics Research Section A:

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“…The amplified signals were sent to a SIS3305 10-bit digitizer [22] working in 5 Gs/s mode. The digitizer internal trigger was configured to fire on a coincidence [23] between the two detector channels within a 64 ns interval. The individual channel threshold was set to 40 mV.…”

Section: Methodsmentioning

confidence: 99%

Response of a diamond detector sandwich to 14MeV neutrons

Osipenko

Ripani

Ricco

et al. 2016

Nuclear Instruments and Methods in Physics Research Section A:

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In this paper we present the measurement of the response of 50 µm thin diamond detectors to 14 MeV neutrons. Such neutrons are produced in fusion reactors and are of particular interest for ITER neutron diagnostics. Among semiconductor detectors diamond has properties most appropriate for harsh radiation and temperature conditions of a fusion reactor. However, 300-500 µm thick diamond detectors suffer significant radiation damage already at neutron fluences of the order of 10 14 n/cm 2 . It is expected that a 50 µm thick diamond will withstand a fluence of > 10 16 n/cm 2 . We tested two 50 µm thick single crystal CVD diamonds, stacked to form a "sandwich" detector for coincidence measurements. The detector measured the conversion of 14 MeV neutrons, impinging on one diamond, into α particles which were detected in the second diamond in coincidence with nuclear recoil. For 12 C(n, α) 9 Be reaction the total energy deposited in the detector gives access to the initial neutron energy value. The measured 14 MeV neutron detection sensitivity through this reaction by a detector of effective area 3×3 mm 2 was 5 × 10counts cm 2 /n. This value is in good agreement with Geant4 simulations. The intrinsic energy resolution of the detector was found to be 240 keV FWHM which adds only 10% to ITER's 14 MeV neutron energy spread.

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New neutron detections

Cited by 2 publications

References 16 publications

Upgrade of the compact neutron spectrometer for high flux environments

Upgrade of the compact neutron spectrometer for high flux environments

Response of a diamond detector sandwich to 14MeV neutrons

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