A.V.Belushkin Frank Laboratory of Neutron Physics, JINR, Dubna, Russia Joint Institute for Nuclear Research

Transcription

1 "Neutron scattering at IBR-2 in Dubna: some history, present status and future perspectives" A.V.Belushkin Frank Laboratory of Neutron Physics, JINR, Dubna, Russia

2 Idea of IBR (Импульсный Быстрый Реактор) in 1955 The idea of the pulsed fast reactor of neutrons belongs to russian scientist Dimitry Ivanovich Blokhintsev Why not fix a part of the reactor active zone on a rim of the disk so that at each revolution this part passes near the stationary zone and creates a supercritical mass for a short time? Institute of Physics and Power Engineering in Obninsk, Russia

3 Frank Laboratory of Neutron Physics in World s first reactor of a new type built in 3 years at the FLNP directed by Nobel Laureate Ilya Mikhailovich Frank and under the guidance of Fyodor Lvovich Shapiro June 23, start-up operation power of 1kW upgraded to 6kW 1958 Nobel Prize in physics to P.A.Cherenkov for the discovery and I.M.Frank and I.Ye.Tamm for a theoretical explanation of the Vavilov-Cherenkov radiation ( )

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5 SANS spectrometer at the IBR-30 reactor; slit geometry Yury Ostanevich and Lazslo Cser at the first SANS detector. Slit geometry; 3 He-counters inside a tube. 5

6 SANS spectrometer with axial geometry 3 He ring detector inside an evacuated tube. 6

7 YuMO small-angle scattering spectrometer at IBR-2

8 IBR-2M Parameters

9 Neutron Sources Around the World Report of a technical meeting held in Vienna, May 2004, IAEA-TECDOC-1439 (2005)

10 Thin multilayered magnetic heterosystems: magnetic ordering in multilayers Spin-Flop-Induced Coarsening of Antiferromagnetic Domains in a Fe/Cr Multilayer Collaboration: RIPNP Budapest Hungary - KU Leuven, Belgium - JINR Dubna - q x - ILL Grenoble, France - TU Muenchen, Germany R -- (non-spin-flip) R -+ (spin-flip) q Fe Cr pi k a i i q z k fa f p f Intensity maps I/I 0 of specular and offspecular scattered neutrons from MgO(001)/[ 57 Fe(26Å)/Cr(13Å)] 20 multilayer in a magnetic field of A) 7 mt, B) 14.2 mt C) 35 mt. The mixture of two domain states with correlation length ~800 nm and >5 m (coarsening) is revealed during the spin-flop transition is observed. D.L. Nagy, L. Bottyán, B. Croonenborghs, L. Deák, B. Degroote, J. Dekoster, H.J. Lauter, V. Lauter-Pasyuk, O. Leupold, M. Major, J. Meersschaut, O. Nikonov, A. Petrenko, R. Rüffer, H. Spiering, E. Szilágyi, Phys. Rev. Lett. 88, (2002).

11 Applied research: magnetic fluids (ferrofluids) Microstructural studies of ferrofluids by small-angle neutron scattering Collaboration: JINR Dubna - CFATR Timisoara, Romania - NIRDIMT Cluj-Napoca, Romania - RISSP Budapest, Hungary - GKSS Geestchaht, Germany - PSI Villigen, Switzerland Strategy of SANS experiments IBR-2 (fast analysis, low resolution) BNC (high resolution, non-polarized neutrons) GKSS (high resolution, polarized neutrons) M.Balasoiu, M.V.Avdeev, A.I.Kuklin, V.L.Aksenov, D.Bica, L.Vekas, D.Hasegan, Gy.Torok, L.Rosta, V.Garamus, J.Kohlbrecher, Magnetohydrodynamics Vol. 40 (2004), pp M.V.Avdeev, V.L.Aksenov, M.Balasoiu, V.M.Garamus, A.Schreyer, Gy.Török, L.Rosta, D.Bica, L.Vékás, J. Colloid Interface Sci. 295 (2006) M.V.Avdeev, D.Bica, L.Vékás, O.Marinica, M.Balasoiu, V.L.Aksenov, L.Rosta, V.M.Garamus, A.Schreyer, J. Mag. Mag. Mater. (2006), accepted.

12 Applied research: nanocarbon Structural Features of Molecular-Colloidal Solutions of C60 Fullerenes in Water by Small-Angle Neutron Scattering Collaboration: JINR Dubna - IT AMSU Kharkov, Ukraine - MSU Moscow, Russia - - RISSP Budapest, Hungary - GKSS Geestchaht, Germany C 60 crystal C 60 monomer C 60 layer SANS data for different samples of FWS, c = 182 M hydration water shell M.V.Avdeev, A.A.Khokhryakov, T.V.Tropin, G.V.Andrievsky, V.K.Klochkov, L.I.Derevyanchenko, L.Rosta, V.M.Garamus, V.B.Priezzhev, M.V.Korobov, V.L.Aksenov, Langmuir 2004, 20, P.Scharff, K.Risch, L.Carta-Abelmann, I.M.Dmytruk, M.M.Bilyi, O.A.Golub, A.V.Khavryuchenko, E.V.Buzaneva, V.L.Aksenov, M.V.Avdeev, Yu.I. Prylutskyy, S.S.Durov, Carbon 42 (2004)

13 Suite of Spectrometers

14 IBR-2M Spectrometers Complex Diffractometers: HRFD, DN-6, RTD, DN-12, FSD, SKAT/Epsilon, FSS Reflectometers: REMUR, REFLEX, GRAINS Small Angle Scattering Spectrometer: YuMO Inelastic Neutron Scattering Spectrometers: 2011: 11 instruments in operation 2018: 15 instruments in operation NERA, DIN-2PI Radiography and Tomography: NRT New Instruments: DN-6, GRAINS, NRT, FSS Reconstruction: REFLEX SESANS

15 Global modernization of the HRFD diffractometer New Fourier chopper in work position. (a) Comparison of the old (V-14-10) и new (V-16-10) incident neutron spectra measured using vanadium sample (a). The gain factor of neutron intensity as function of neutron wavelength measured using the standard Al2O3 sample (b). (b) Neutron guide with vertical parabolic focusing. New mirrors were mounted in old vacuum casing.

16 RTD diffractometer for real-time studies IBR-2: active core moderator Biological shielding Neutron guide tube Back-scattering multi-ring detector Shutter 90 multielement 3 He detector Background chopper 6A, 6B beam splitter Central table, sample position SANS multi-ring detector 2D PSD on rotating arm Neutron flux at sample position: n/cm 2 /s Resolution 2 = : d/d =10 0 : d/d 0.05 D-spacing range: 1-80 Å T - range: K K Typical measurement times: min Parameters comparable with dedicated instruments in other leading neutron centers (SNS, J-PARC, ILL)

17 DN-12 Spectrometer for Studies of Microsamples Intensity, arb. units Neutron flux at sample position: n/cm 2 /s Resolution at d = 2 Å, 2 =90 0 : d/d = 0.02 D-spacing range: Å Pressure range: 0 7 GPa Temperature range: K Simultaneous study of crystal and magnetic structure of materialsfm Pr 0.52 Sr 0.48 MnO 3 P = 0 GPa T = 16 K P = 2.2 GPa T = 16 K I4/mcm Fmmm FM A-type AFM d hkl, Å FM FM P=0 GPa, T=16 K P=2.2 GPa, T=16 K A-type AFM A-type AFM d-spacing, Å Pressure cell with sapphire anvils

18 Further Developments PTH sample environment system (NEO KS FLNP) 3D model of horizontal dry cryostats with split-coil HTSC magnet and cold anvils-insert 1 4 n n 9 Two detectors rings 7 8 of DN first cryostat with coils HTSC magnet (YBCO superconductor tape); 2 - magnet second cryostat with pressure cell; 4 current lead; 5 high pressure chamber; 6 и 7 detectors DN12; 8 cryorefrigerator SRDK408S, 9 cryorefrigerator SRDK101D Large volume press for high pressure (0 30 GPa) and temperature ( K) experiments

19 Diffractometer DN-6 for studies of microsamples under extreme conditions Intensity gain: 12 times (compared to DN-12) Pressure range: GPa Temperature range: K DN-6 diffractometer (operational from 2012 DAC Sample volume: mm 3 Second circular detector of DN-6, consisting of 96 separate 3 Не counters Neutron diffraction patterns of Cr Neutron diffraction patterns of Cr 2 O 3 2 O 3 sample measured in sapphire anvil sample measured in DAC up to 35 cell up to 4.6 GPa GPa

20 Further Development of DN-6: Installation of Neutron Parabolic Focusing Device (7 m length) a) b) 0 cm 45 cm 87 cm neutron counts, arb.units gain factor old guide c) The replacement of the remaining tail part of the mirror neutron guide (17 m) from m = 1 to m = 2 is planned. The expected additional Joint Institute intensity for gain Nuclear is ~ Research 2 times focusing TOF channel TOF channel Neutron flux at sample position: n/cm 2 /s (with focusing device) Resolution at d = 2 Å, 2 =90 0 : d/d = D-spacing range: Å Pressure range: 0 50 GPa Temperature range: K Top level among relevant class of instruments, achievable pressure range comparable with SNAP (SNS) The averaged incident neutron flux gain is ~ 6 times. Multiplication factor compared to DN-12: 35 times

21 Experimental test of SESANS setup at 9-th beamline of the IBR-2 reactor Z Y X 1 2 B A Spin rotator Fig. 1. A) Wavelength dependence of the polarization Pz of the outgoing neutron beam for the symmetric setup without sample. B) NSE signals observed for indicated wavelength bands (1,2,3,4,5).

22 A Structural Study of the Fe-Al phase diagram Neutron diffraction patterns of Fe-26.6Al alloy measured on heating with a rate of 1 deg/min. An example of high resolution ND patterns and W 2 on d 2 dependences in Fe26.5 and Fe-27Al. A.M.Balagurov et al., JETP Letters (2016)

23 Real-Time Studies of Li-Based rechargeable batteries HRFD : Bobrikov I.A., Balagurov A.M. et al. J of Power Sources 258 (2014) Real-time monitoring of transition processes during charge-discharge cycles revealed 10% increase of LiC 6 phase in anode when cathode was doped with vanadium oxide, which correlates with better electrochemical properties.

24 Neutron radiography and tomography facility: cultural heritage studies «Tver treasure» was found in 2014 Institute of Archaeology of Russian Academy of Science The part of Old-Russian ancient bracelet dated to XIV century. Neutron tomography reconstructed model with hidden gilding pattern

25 25 User Programme - STATISTICS Number of proposals Submitted Accepted

26 Conclusions JINR possesses unique basic facility for advanced research in the field of condensed matter science Cooperation with JINR member states and partners is of great importance for us Thank you for the attention!