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Pyroelectric X-ray and neutron generator for low background detectors
Pyroelectric X-ray and neutron generator for low background detectors
Calibration neutrino and dark matter detectors using neutrons
Calibration neutrino and dark matter detectors using neutrons
Mechanisms of X-Ray and neutrons generation by pyroelectric crystals
Mechanisms of X-Ray and neutrons generation by pyroelectric crystals
X-Ray emission is indication of proper condition of neutron generation
X-Ray emission is indication of proper condition of neutron generation
Advantages of pyroelectric neutron generator for low background
Advantages of pyroelectric neutron generator for low background
Experimental setup (Radiation Physics Laboratory, Belgorod)
Experimental setup (Radiation Physics Laboratory, Belgorod)
Scheme of experimental setup for neutron generation
Scheme of experimental setup for neutron generation
Current state of the project
Current state of the project
Next steps
Next steps
Thank you for attention
Thank you for attention
taken by A. E. Bondar, A. F. Buzulutskov, et al
taken by A. E. Bondar, A. F. Buzulutskov, et al
Detector
Detector
Angular dependence of neutron emission cross section [mb / sr], given
Angular dependence of neutron emission cross section [mb / sr], given

Презентация на тему: «Иксрей 23 апреля 2015». Автор: Андрей. Файл: «Иксрей 23 апреля 2015.pptx». Размер zip-архива: 915 КБ.

Иксрей 23 апреля 2015

содержание презентации «Иксрей 23 апреля 2015.pptx»
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1 Pyroelectric X-ray and neutron generator for low background detectors

Pyroelectric X-ray and neutron generator for low background detectors

calibration

A.S. Chepurnov a, V.Y. Ionidi a, O.O. Ivashchuk b, A.S. Kubankin b,c, A.N. Oleinik b, A.V. Shchagin b,d

International Conference on Particle Physics and Astrophysics (ICPPA 2015) 2015 October 8, Moscow

a Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, Moscow, Russia b Radiation Physics Laboratory, Belgorod State University, Belgorod, Russia C Lebedev Physical Institute, Moscow, Russia d Kharkov Institute of Physics and Technology, Kharkov, Ukraine

2 Calibration neutrino and dark matter detectors using neutrons

Calibration neutrino and dark matter detectors using neutrons

Elastic scattering: n+Ar?n+Arrec

Inelastic scattering: n+Ar?n+Ar*?n+Arrec+g(1.46 MeV)

Possible calibration geometry, if generator is compact

Primary recoil nucleus required for detector calibration can be produced by neutrons. Recoils is produced by elastic scattering on neutrons. A source of neutrons with constant energy and low divergence is required.

taken by A. E. Bondar, A. F. Buzulutskov, et al., Proposal for neutron scattering systems for calibration of dark matter search and low-energy neutrino detectors, Vestnik of NSU: Physics Series, pp. 27-38, vol. 8, n. 3, (2013) (at Russian) James R. Verbus, Brown University, Measurement of Ultra-low Energy Nuclear Recoils in the LUX Detector Using a D-D Neutron Generator, report at workshop “Calibration of low energy particle detectors”, September 23-25, 2015, Chicago.

Scattered neutrons

q

Scattering event

3 Mechanisms of X-Ray and neutrons generation by pyroelectric crystals

Mechanisms of X-Ray and neutrons generation by pyroelectric crystals

X-Ray radiation generation

Neutrons (2.45 MeV) generation

Positively charged only

4 X-Ray emission is indication of proper condition of neutron generation

X-Ray emission is indication of proper condition of neutron generation

Typical X-Ray spectrum from pyroelectric source

Data are summarized for three thermal cycles

5 Advantages of pyroelectric neutron generator for low background

Advantages of pyroelectric neutron generator for low background

detectors calibration

Such sources will have a typical size of several cubic centimeters. Pyroelectric source do not contain any radioactive substances and could be manufactured low background. Pyroelectric source don’t need external high voltage power supply. When the pyroelectric source is tuned off, it does not produce any radiation and does not disturbed operation of the detector Fixed neutron energy (2.45 MeV), controllable time-stamp of neutron flux. The source can be tuned on by connecting of a low voltage power supply that should provide variation of the temperature of the pyroelectric crystal.

6 Experimental setup (Radiation Physics Laboratory, Belgorod)

Experimental setup (Radiation Physics Laboratory, Belgorod)

needle valve

vacuum gauge

X-Ray detector

vacuum chamber

high vacuum pump

forvacuum pump

D2 buster volume

?n - detector

7 Scheme of experimental setup for neutron generation

Scheme of experimental setup for neutron generation

Energy of produced neutrons – 2.45 MeV. The neutrons source should has intensity of several hundred neutrons per thermal cycle.

8 Current state of the project

Current state of the project

Development in progress….

Production tungsten tip and deuterium target Construction experimental setup for neutron generation First experiment of neutron generation – no success yet

Neutron detector SDMF-1206

tungsten tip

aluminum pad

LiTaO3

9 Next steps

Next steps

Search of optimal condition for neutrons generation from pyroelectric source (thermal conditions, pressure, geometry of source, W-tip characteristics, D-target characteristics). Selection materials with ultra low level of radioactivity for pyroelectric neutron source device. Design and construction of the compact neutron generator for low background detectors calibration

Acknowledgement Authors are thankful to S.I. Bashko and his team from ISSP RAS for production of tungsten tips. This study was supported financially by the Russian Foundation for Basic Research, projects 14-22-0301 ofi_m and the Ministry of Education and Science of the Russian Federation, project 3.2009.2014/K.

10 Thank you for attention

Thank you for attention

11 taken by A. E. Bondar, A. F. Buzulutskov, et al

taken by A. E. Bondar, A. F. Buzulutskov, et al

, Proposal for neutron scattering systems for calibration of dark matter search and low-energy neutrino detectors, Vestnik of NSU: Physics Series, pp. 27-38, vol. 8, n. 3, (2013) (at Russian)

nonelastic scattering

elastic scattering

Cross-section of scattering

Cross-section, barn

Scattering angle, deg.

12 Detector

Detector

SDMF-1206 (made in russia) energy scale for n 350 kev – 12 (14) мev energy scale for gamma 100 kev – 6 mev power of equivalent doze for mixed n/gamma fields 0.1-1000 mksv/s principle – FADC (PSD) p-recoil /gamma discrimination, p-terphenyl/stilben crystal 2 – 4 sm3 + PMT

13 Angular dependence of neutron emission cross section [mb / sr], given

Angular dependence of neutron emission cross section [mb / sr], given

in terms of the emitted neutron angle relative to the angle of the incident deuteron. Shown for center-of-mass system (dashed line) and laboratory system (solid line). Taken by Y. Danon “A novel compact neutron and X-Ray source”, technical report (2007) Data for incident deuterons with energy 100 keV.

If energy of incident deuterons increase, then anisotropy of neutron emission is more.

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