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2. Comlexed RF-module with synchronized generators M-type

Author

I.M. Ivanov, N.I. Skripkin, A.V. Shmelev, and A.I. Pronikov

Subjects
Physics, Radiation, business.industry, Electrical engineering, RF module, Electrical and Electronic Engineering, Type (model theory), business
Abstract

On the basis of previously carried out works [2, 3], it has been established that the most effective way for coherent summation of the power of two generators with a waveguide output is to use a waveguide 3-decibel bridge as an adder. In this case, the output power of the synchronized device within the synchronization band can reach 95% of the total power of the generators. Purpose of the work is to describe the installation «microwave module», which uses the method of coherent summation of the powers of two magnetrons in the power adder. Mutual phased synchronization of two magnetrons is provided by a phase shifter, matching is provided by a short-circuiting piston. The summed signal is sent to the output (antenna) path of the radar. The microwave generator module is designed to generate probing pulse signals in a multifunctional receiving-transmitting radar measuring complex. For the first time in Russia, JSC «Pluton» has created a «microwave module» installation in the 2-centimeter wavelength range, which makes it possible to use the principle of coherent addition of the powers of two commercially available magnetrons. The installation cost and manufacturing time are many times less than those for a newly developed magnetron with the parameters presented in this article.

Published
2021
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3. Development of $$^{100}\hbox {Mo}$$ 100 Mo -containing scintillating bolometers for a high-sensitivity neutrinoless double-beta decay search

Author

C. Augier, T. Bergmann, V. Sanglard, S. Di Domizio, M. Vignati, B. Paul, L. Hehn, X. F. Navick, J. W. Beeman, A. Giuliani, E. Queguiner, J. Billard, Andreas Fleischmann, Matthias Laubenstein, H. le Sueur, L. Cardani, L. Dumoulin, L. Devoyon, L. Pattavina, J. Gascon, A. S. Zolotarova, Stefano Pirro, V. Kozlov, L. Gastaldo, A. Cazes, T. Redon, Francesca Bellini, E. Yakushev, G. Piperno, O. Strazzer, Y. Penichot, I.M. Ivanov, S. Scorza, P. Pari, L. Pagnanini, V. D. Grigorieva, Noël Coron, A. Juillard, Matias Velázquez, F. Koskas, Claire A. Marrache-Kikuchi, P. Camus, V.N. Shlegel, K. Eitel, M. de Combarieu, S. V. Rozov, V. V. Kobychev, L. Vagneron, L. Bergé, Vl.I. Tretyak, Matias Rodrigues, R. S. Boiko, V. A. Kudryavtsev, E. Armengaud, F. Ferroni, A. Broniatowski, M. Pavan, Yong Jin, A. S. Barabash, N. Foerster, D. Tcherniakhovski, Alain Benoit, O. Plantevin, N.V. Ivannikova, Martin Loidl, P. de Marcillac, K. Schäffner, Matthias Kleifges, S. Marnieros, P. Magnier, C. Rusconi, M. Gros, C. Nones, D.V. Poda, D. M. Chernyak, B. Siebenborn, M. O. Nikolaichuk, Claudia Tomei, F.A. Danevich, Ya.V. Vasiliev, M. Mancuso, V. I. Umatov, S.I. Konovalov, Christian Enss, E. Olivieri, V. Humbert, S. Hervé, Marc Weber, N. Casali, V.B. Brudanin, M. Chapellier, L. Gironi, I. Dafinei, H. Kraus, G. Pessina, T.B. Bekker, E. P. Makarov, S. Nagorny, M. De Jesus, Silvia Capelli, V. Novati, and F. Charlieux

Subjects
Physics, Lithium molybdate, Recrystallization (geology), Physics and Astronomy (miscellaneous), 010308 nuclear & particles physics, Bolometer, lcsh:Astrophysics, 01 natural sciences, law.invention, Nuclear physics, Full width at half maximum, chemistry.chemical_compound, chemistry, law, Double beta decay, 0103 physical sciences, lcsh:QB460-466, lcsh:QC770-798, lcsh:Nuclear and particle physics. Atomic energy. Radioactivity, Sensitivity (control systems), Neutrino, 010306 general physics, Engineering (miscellaneous), Energy (signal processing)
Abstract

This paper reports on the development of a technology involving $$^{100}\hbox {Mo}$$ 100 Mo -enriched scintillating bolometers, compatible with the goals of CUPID, a proposed next-generation bolometric experiment to search for neutrinoless double-beta decay. Large mass ( $$\sim 1~\hbox {kg}$$ ∼ 1 kg ), high optical quality, radiopure $$^{100}\hbox {Mo}$$ 100 Mo -containing zinc and lithium molybdate crystals have been produced and used to develop high performance single detector modules based on 0.2–0.4 kg scintillating bolometers. In particular, the energy resolution of the lithium molybdate detectors near the Q-value of the double-beta transition of $$^{100}\hbox {Mo}$$ 100 Mo (3034 keV) is 4–6 keV FWHM. The rejection of the $$\alpha $$ α -induced dominant background above 2.6 MeV is better than $$8\sigma $$ 8 σ . Less than $$10~\upmu \hbox {Bq/kg}$$ 10 μ Bq/kg activity of $$^{232}\hbox {Th}\, (^{228}\hbox {Th})$$ 232 Th ( 228 Th ) and $$^{226}\hbox {Ra}$$ 226 Ra in the crystals is ensured by boule recrystallization. The potential of $$^{100}\hbox {Mo}$$ 100 Mo -enriched scintillating bolometers to perform high sensitivity double-beta decay searches has been demonstrated with only $$10~\hbox {kg}\times \hbox {d}$$ 10 kg × d exposure: the two neutrino double-beta decay half-life of $$^{100}\hbox {Mo}$$ 100 Mo has been measured with the up-to-date highest accuracy as $$T_{1/2}$$ T 1 / 2 = [6.90 ± 0.15(stat.) ± 0.37(syst.)] $$\times ~10^{18}~\hbox {years}$$ × 10 18 years . Both crystallization and detector technologies favor lithium molybdate, which has been selected for the ongoing construction of the CUPID-0/Mo demonstrator, containing several kg of $$^{100}\hbox {Mo}$$ 100 Mo .

Published
2017
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5. An Aboveground Pulse-Tube-Based Bolometric Test Facility for the Validation of the LUMINEU $$\hbox {ZnMoO}_4$$ ZnMoO 4 Crystals

Author

E. P. Makarov, V.N. Shlegel, Claudio Gotti, M. Mancuso, Andrea Giachero, G. Pessina, Ahmad Sultan, E. Olivieri, Ya.V. Vasiliev, A. Giuliani, M. Tenconi, L. Dumoulin, Henri Godfrin, F.A. Danevich, D. M. Chernyak, I.M. Ivanov, and M. Maino

Subjects
Physics, Scintillation, Test facility, 010308 nuclear & particles physics, Bolometer, Cryogenics, Condensed Matter Physics, 01 natural sciences, Atomic and Molecular Physics, and Optics, Pulse (physics), law.invention, Nuclear physics, Crystal, law, Double beta decay, 0103 physical sciences, General Materials Science, Dilution refrigerator, 010306 general physics
Abstract

The LUMINEU project aims at developing a pilot double beta decay experiment using scintillating bolometers based on ZnMoO $$_4$$ crystals enriched in $$^{100}\hbox {Mo}$$ . In the next months regular deliveries of large-mass $$\hbox {ZnMoO}_4$$ crystals are expected from the Nikolaev Institute of Inorganic Chemistry (Novosibirsk, Russia). It is therefore crucial for the LUMINEU program to test systematically and in real time these samples in terms of bolometric properties, light yield and internal radioactive contamination. In this paper we describe an aboveground cryogenic facility based on a dilution refrigerator coupled to a pulse-tube cooler capable performing these measurements. A 23.8 g $$\hbox {ZnMoO}_4$$ crystal was fully characterised in this setup. We show also that macro-bolometers can be operated with high signal-to-noise ratio in liquid-free dilution refrigerators.

Published
2014
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6. An Improved ZnMoO4 Scintillating Bolometer for the Search for Neutrinoless Double Beta Decay of 100Mo

Author

Jeffrey W. Beeman, E. Olivieri, G. Pessina, C. Rusconi, V. I. Tretyak, C. Nones, F.A. Danevich, Ya.V. Vasiliev, A. Giuliani, S. Marnieros, M. Mancuso, V. N. Shlegel, I.M. Ivanov, E. N. Galashov, V. Y. Degoda, CSNSM PS1, Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)-Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), CSNSM INSTR, and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)

Subjects
ZnMoO4 crystals, Phonon, 7. Clean energy, 01 natural sciences, law.invention, Nuclear physics, Crystal, Neutrino mass, law, Double beta decay, 0103 physical sciences, General Materials Science, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Bolometric technique, 010306 general physics, Low background, Physics, Scintillation, 010308 nuclear & particles physics, Bolometer, Thermistor, Atmospheric temperature range, Condensed Matter Physics, Atomic and Molecular Physics, and Optics, Full width at half maximum
Abstract

We present a prototype scintillating bolometer for the search for neutrinoless double beta decay of Mo-100, consisting of a single a parts per thousand 5 g ZnMoO4 crystal operated aboveground in the 20-30 mK temperature range. The scintillation light is read out by two thin Ge bolometers. The phonon signals are collected by NTD Ge thermistors. The ZnMoO4 crystal was grown with an advanced method (low-thermal-gradient Czochralski technique) and after purification of molybdenum. The results are very encouraging: the intrinsic energy resolution of the heat channel is a parts per thousand 800 eV FWHM, the alpha/beta rejection factor (crucial for background suppression) is better than 99.9% in the region of interest for double beta decay (a parts per thousand 3 MeV), and the radiopurity of ZnMoO4 looks substantially improved with respect to previous devices.

Published
2012
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7. Development and underground test of radiopure ZnMoO4 scintillating bolometers for the LUMINEU 0 nu 2 beta project

Author

J. Gascon, R. J. Walker, O. Plantevin, A. A. Drillien, V.N. Shlegel, M. Gros, S. Marnieros, K. Eitel, V. Kozlov, Christian Enss, M. Kleifges, B. Paul, T. de Boissière, C. Nones, C. Augier, L. Hehn, E. Olivieri, E. Yakushev, P. Coulter, C. Kéfélian, V. Humbert, G. Gerbier, M. Rodrigues, M. Chapellier, N. Foerster, A. Giuliani, S. Scorza, V. B. Brudanin, G. Heuermann, T. Redon, F. Koskas, L. Dumoulin, P. de Marcillac, Claire A. Marrache-Kikuchi, P. Magnier, S. Hervé, N. Fourches, L. Vagneron, H. Kraus, V.N. Zhdankov, A. Menshikov, M.-C. Piro, Max Robinson, Y. Penichot, X-F. Navick, Matias Velázquez, I.M. Ivanov, V. V. Kobychev, P. Pari, A. Broniatowski, R. Decourt, A. Cazes, D. Filosofov, A. Fleischmann, Oudomsack Viraphong, O. Strazzer, Denis Tcherniakhovski, G. Pessina, D. Gray, L. Gastaldo, Noël Coron, M. Loidl, Ph. Camus, L. Bergé, Alain Benoit, E.P. Makarov, V. A. Kudryavtsev, D.M. Chernyak, S. Henry, E. Armengaud, L. Devoyon, B. Schmidt, F.A. Danevich, Ya.V. Vasiliev, J. Blümer, M. Mancuso, R.S. Boiko, M. De Jesus, M. Tenconi, S. V. Rozov, Marc Weber, D.V. Poda, V.I. Tretyak, H. Kluck, T. Bergmann, Q. Arnaud, H. Le Sueur, X. Zhang, V. Sanglard, B. Siebenborn, A. Juillard, S.G. Nasonov, F. Charlieux, L. Torres, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Hélium : du fondamental aux applications (HELFA), Institut Néel (NEEL), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF), Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Kiev Institute for Nuclear Research (KINR), Ukrainian Academy of Sciences, Karlsruhe Institute of Technology (KIT), Dzhelepov Laboratory of Nuclear Problems [Dubna] (DLNP), Joint Institute for Nuclear Research (JINR), Cryogénie (Cryo), Institut d'astrophysique spatiale (IAS), Université Paris-Sud - Paris 11 (UP11)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), University of Oxford [Oxford], Institut de Chimie de la Matière Condensée de Bordeaux (ICMCB), Université de Bordeaux (UB)-Institut Polytechnique de Bordeaux-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Karlsruher Institut für Technologie (KIT), Kirchhoff Institute for Physics, Universität Heidelberg [Heidelberg], Nikolaev Institute of Inorganic Chemistry [Novosibirsk] (NIC), Siberian Branch of the Russian Academy of Sciences (SB RAS), University of Sheffield [Sheffield], Laboratoire National Henri Becquerel (LNHB), Département Métrologie Instrumentation & Information (DM2I), Laboratoire d'Intégration des Systèmes et des Technologies (LIST), Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Laboratoire d'Intégration des Systèmes et des Technologies (LIST), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Service de physique de l'état condensé (SPEC - UMR3680), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Istituto Nazionale di Fisica Nucleare, Sezione di Milano (INFN), Istituto Nazionale di Fisica Nucleare (INFN), Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut Polytechnique de Bordeaux-Université de Bordeaux (UB), CML Ltd, ANR-12-BS05-0004,LUMINEU,Expérience souterraine avec détecteurs luminescents de molybdate de zinc pour l'étude de la masse et la nature des neutrinos(2012), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Hélium : du fondamental aux applications (NEEL - HELFA), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Cryogénie (NEEL - Cryo), Université Paris-Sud - Paris 11 (UP11)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Centre National d’Études Spatiales [Paris] (CNES), University of Oxford, Universität Heidelberg [Heidelberg] = Heidelberg University, Laboratoire d'Intégration des Systèmes et des Technologies (LIST (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Laboratoire d'Intégration des Systèmes et des Technologies (LIST (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Département d'instrumentation Numérique (DIN (CEA-LIST)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), HELFA - Hélium : du fondamental aux applications, Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA), CSNSM PS1, Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Laboratory of Particle Physics (JINR-DUBNA), Joint Institute for Nuclear Research, Cryo - Cryogénie, Université de Bordeaux (UB)-Institut Polytechnique de Bordeaux-Centre National de la Recherche Scientifique (CNRS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Direction de Recherche Technologique (CEA) (DRT (CEA)), Institut Rayonnement Matière de Saclay (IRAMIS), Istituto Nazionale di Fisica Nucleare [Milano] (INFN), Joint Institute for Nuclear Research - Dubna, ANR-12-BS05-004,LUMINEU,Luminescent Underground Molybdenum Investigation for NEUtrino mass and nature, Armengaud, E, Arnaud, Q, Augier, C, Benoit, A, Berge, L, Boiko, R, Bergmann, T, Blumer, J, Broniatowski, A, Brudanin, V, Camus, P, Cazes, A, Chapellier, M, Charlieux, F, Chernyak, D, Coron, N, Coulter, P, Danevich, F, De Boissiere, T, Decourt, R, Jesus, M, Devoyon, L, Drillien, A, Dumoulin, L, Eitel, K, Enss, C, Filosofov, D, Fleischmann, A, Foerster, N, Fourches, N, Gascon, J, Gastaldo, L, Gerbier, G, Giuliani, A, Gray, D, Gros, M, Hehn, L, Henry, S, Herve, S, Heuermann, G, Humbert, V, Ivanov, I, Juillard, A, Kefelian, C, Kleifges, M, Kluck, H, Kobychev, V, Koskas, F, Kozlov, V, Kraus, H, Kudryavtsev, V, Sueur, H, Loidl, M, Magnier, P, Makarov, E, Mancuso, M, De Marcillac, P, Marnieros, S, Marrache-Kikuchi, C, Menshikov, A, Nasonov, S, Navick, X, Nones, C, Olivieri, E, Pari, P, Paul, B, Penichot, Y, Pessina, G, Piro, M, Plantevin, O, Poda, D, Redon, T, Robinson, M, Rodrigues, M, Rozov, S, Sanglard, V, Schmidt, B, Scorza, S, Shlegel, V, Siebenborn, B, Strazzer, O, Tcherniakhovski, D, Tenconi, M, Torres, L, Tretyak, V, Vagneron, L, Vasiliev, Y, Velazquez, M, Viraphong, O, Walker, R, Weber, M, Yakushev, E, Zhang, X, and Zhdankov, V

Subjects
gas and liquid scintillators), Zinc molybdate, Cryogenic detector, EDELWEISS, Scintillator, 01 natural sciences, Nuclear physics, CRYSTAL SCINTILLATORS, chemistry.chemical_compound, Double beta decay, 0103 physical sciences, Dilution refrigerator, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat], 010306 general physics, Instrumentation, GRADIENT CZOCHRALSKI TECHNIQUE, Mathematical Physics, Physics, TUNGSTATES, 010308 nuclear & particles physics, Hybrid detector, DOUBLE-BETA-DECAY, Hybrid detectors, Scintillators, scintillation and light emission processes (solid, gas and liquid scintillators), Double-beta decay detectors, Double-beta decay detector, DARK-MATTER SEARCH, scintillation and light emission processes (solid, RADIOACTIVE CONTAMINATION, Cryogenic detectors, chemistry, Scintillators, LUMINESCENCE, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], PARTICLE PHYSICS, GROWTH, SINGLE-CRYSTALS, Neutrino, Isotopes of thorium, Radioactive decay
Abstract

International audience; The LUMINEU (Luminescent Underground Molybdenum Investigation for NEUtrino mass and nature) project envisages a high-sensitivity search for neutrinoless double beta (0 nu 2 beta) decay of Mo-100 with the help of scintillating bolometers based on zinc molybdate (ZnMoO4) crystals. One of the crucial points for the successful performance of this experiment is the development of a protocol for producing high quality large mass ZnMoO4 crystal scintillators with extremely high internal radiopurity. Here we report a significant progress in the development of large volume ZnMoO4 crystalline boules (with mass up to 1 kg) from deeply purified materials. We present and discuss the results achieved with two ZnMoO4 samples (with mass of about 0.3 kg each): one is a precursor of the LUMINEU project, while the other one was produced in the framework of LUMINEU with an improved purification / crystallization procedure. The two crystals were measured deep underground as scintillating bolometers in the EDELWEISS dilution refrigerator at the Laboratoire Souterrain de Modane (France) protected by a rock overburden corresponding to 4800 m w.e. The results indicate that both tested crystals are highly radiopure. However, the advanced LUMINEU sample shows a clear improvement with respect to the precursor, exhibiting only a trace internal contamination related with Po-210 at the level of 1 mBq/kg, while the activity of Ra-226 and Th-228 is below 0.005 mBq/kg. This demonstrates that the LUMINEU purification and crystal-growth procedures are very efficient and leads to radiopurity levels which exceedingly satisfy not only the LUMINEU goals but also the requirements of a next-generation 0 nu 2 beta experiment.

Published
2015
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8. Status of LUMINEU program to search for neutrinoless double beta decay of 100Mo with cryogenic ZnMoO4 scintillating bolometers

Author

F. Koskas, L. Torres, Claire A. Marrache-Kikuchi, A. A. Drillien, C. Nones, L. Devoyon, G. Pessina, B. Paul, X-F. Navick, Christian Enss, D.V. Poda, D. Gray, I.M. Ivanov, Matias Velázquez, V. Humbert, O. Strazzer, Loredana Gastaldo, A. Juillard, Achim Fleischmann, Luc Bergé, P. Magnier, M. Tenconi, Ya.V. Vasiliev, M. Gros, F.A. Danevich, Oudomsack Viraphong, Y. Penichot, E. Olivieri, D. M. Chernyak, O. Plantevin, E. P. Makarov, Vl.I. Tretyak, V.N. Shlegel, R. S. Boiko, M. Chapellier, S. Hervé, P. de Marcillac, S. Marnieros, A. Giuliani, T. Redon, L. Dumoulin, M. Mancuso, Martin Loidl, V.V. Kobychev, N. Coron, Matias Rodrigues, Kiev Institute for Nuclear Research (KINR), Ukrainian Academy of Sciences, Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut d'astrophysique spatiale (IAS), Université Paris-Sud - Paris 11 (UP11)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Centre National d’Études Spatiales [Paris] (CNES), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Kirchhoff Institut für Physik, Universität Heidelberg [Heidelberg] = Heidelberg University, Universitá degli Studi dell’Insubria = University of Insubria [Varese] (Uninsubria), Nikolaev Institute of Inorganic Chemistry [Novosibirsk] (NIC), Siberian Branch of the Russian Academy of Sciences (SB RAS), Institut de Physique Nucléaire de Lyon (IPNL), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire National Henri Becquerel (LNHB), Département Métrologie Instrumentation & Information (DM2I), Laboratoire d'Intégration des Systèmes et des Technologies (LIST (CEA)), Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Laboratoire d'Intégration des Systèmes et des Technologies (LIST (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Département d'instrumentation Numérique (DIN (CEA-LIST)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Istituto Nazionale di Fisica Nucleare, Sezione di Milano (INFN), Istituto Nazionale di Fisica Nucleare (INFN), Università degli Studi di Milano-Bicocca = University of Milano-Bicocca (UNIMIB), Istituto Nazionale di Fisica Nucleare [Sezione di Roma 1] (INFN), Istituto Nazionale di Fisica Nucleare, Institut de Chimie de la Matière Condensée de Bordeaux (ICMCB), Université de Bordeaux (UB)-Institut Polytechnique de Bordeaux-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Osvaldo Civitarese, Ivan Stekl and Jouni Suhonen, ANR-12-BS05-0004,LUMINEU,Expérience souterraine avec détecteurs luminescents de molybdate de zinc pour l'étude de la masse et la nature des neutrinos(2012), Université Paris-Sud - Paris 11 (UP11)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Universität Heidelberg [Heidelberg], Università dell’Insubria, Laboratoire d'Intégration des Systèmes et des Technologies (LIST), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Laboratoire d'Intégration des Systèmes et des Technologies (LIST), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Istituto Nazionale di Fisica Nucleare [Milano] (INFN), Università degli Studi di Milano-Bicocca [Milano] (UNIMIB), Université de Bordeaux (UB)-Institut Polytechnique de Bordeaux-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)

Subjects
Physics::Instrumentation and Detectors, MEASURING INSTRUMENTS, 01 natural sciences, Particle identification, MOLYBDENUM 100, law.invention, Crystal, chemistry.chemical_compound, law, ELEMENTS, ANTICOINCIDENCE, REFRACTORY METAL COMPOUNDS, DOUBLE BETA DECAY, SIGNAL CONDITIONERS, Physics, TRANSITION ELEMENT COMPOUNDS, BOLOMETERS, EVEN-EVEN NUCLEI, TEMPERATURE GRADIENTS, ZINC COMPOUNDS, NUCLEAR DECAY, METALS, Neutrino, PARTICLE IDENTIFICATION, TRANSITION ELEMENTS, INTERMEDIATE MASS NUCLEI, PARTICLE DISCRIMINATION, Radioactive decay, REFRACTORY METALS, Zinc molybdate, PULSE CIRCUITS, PULSE SHAPERS, ENERGY RESOLUTION, MOLYBDATES, Scintillator, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear physics, MOLYBDENUM COMPOUNDS, MOLYBDENUM ISOTOPES, Double beta decay, 0103 physical sciences, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], 010306 general physics, BETA DECAY, STABLE ISOTOPES, NUCLEI, 010308 nuclear & particles physics, Bolometer, ELECTRONIC CIRCUITS, BETA-MINUS DECAY, CRYSTALS, OXYGEN COMPOUNDS, PHOSPHORS, chemistry, RESOLUTION, ISOTOPES, DECAY
Abstract

ISBN: 978-0-7354-1333-7; International audience; The LUMINEU program aims at performing a pilot experiment on 0ν2β decay of 100 Mo using radiopure ZnMoO4 crystals enriched in 100 Mo operated as cryogenic scintillating bolometers. Large volume ZnMoO4 crystal scintillators (∼ 0.3 kg) were developed and tested showing high performance in terms of radiopurity, energy resolution and α/β particle discrimination capability. Zinc molybdate crystal scintillators enriched in 100 Mo were grown for the first time by the low-thermal-gradient Czochralski technique with a high crystal yield and an acceptable level of enriched molybdenum irrecoverable losses. A background level of ∼ 0.5 counts/(yr keV ton) in the region of interest can be reached in a large detector array thanks to the excellent detectors radiopurity and particle discrimination capability, suppression of randomly coinciding events by pulse-shape analysis, and anticoincidence cut. These results pave the way to future sensitive searches based on the LUMINEU technology, capable of approaching and exploring the inverted hierarchy region of the neutrino mass pattern.

Published
2015
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9. Effect of tungsten doping on ZnMoO4 scintillating bolometer performance

Author

V.N. Zhdankov, H. Kraus, V.M. Mokina, P. de Marcillac, M. Tenconi, V.B. Mikhailik, Ya.P. Kogut, E. P. Makarov, Matias Velázquez, S.G. Nasonov, V.N. Shlegel, D. M. Chernyak, V.Ya. Degoda, B. N. Kropivyansky, D.V. Poda, V.I. Tretyak, I.M. Ivanov, M. Mancuso, O. Plantevin, I.M. Moroz, A. Giuliani, F.A. Danevich, Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institute for Nuclear Research of NAS of Ukraine, National Academy of Sciences of Ukraine (NASU), Taras Shevchenko National University of Kyiv, Institut de Chimie de la Matière Condensée de Bordeaux (ICMCB), Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut Polytechnique de Bordeaux-Université de Bordeaux (UB), and This work is a part of the program of LUMINEU, a project receiving funds from the Agence Nationale de la Recherche (ANR, France). The collaborative activity between LUMINEU and EDELWEISS was performed in the framework of a MoU in force between the two collaborations. D.V. Poda was supported by the P2IO LabEx (ANR-10-LABX-0038) in the framework 'Investissements d’Avenir' (ANR-11-IDEX-0003-01) managed by the ANR (France). The help of the technical staff of the Laboratoire Souterrain de Modane is gratefully acknowledged.

Subjects
100Mo, Cryogenic scintillating bolometer, Doped scintillator, Double beta decay, Luminescence, Scintillation decay, Scintillation efficiency, ZnMoO4 crystal, Electronic, Optical and Magnetic Materials, Electrical and Electronic Engineering, Atomic and Molecular Physics, and Optics, Computer Science (all), Materials science, Analytical chemistry, chemistry.chemical_element, Tungsten, 100100Mo, 01 natural sciences, law.invention, Inorganic Chemistry, Crystal, law, Atomic and Molecular Physics, 0103 physical sciences, Electronic, Optical and Magnetic Materials, Physical and Theoretical Chemistry, 010306 general physics, Spectroscopy, Scintillation, 010308 nuclear & particles physics, business.industry, Organic Chemistry, Doping, Bolometer, [CHIM.MATE]Chemical Sciences/Material chemistry, chemistry, Molybdenum, Yield (chemistry), Optoelectronics, and Optics, business
Abstract

International audience; The introduction of a small quantity of tungsten oxide (in the range 0.2–0.5 wt%) into the melt improves the growth of ZnMoO4 crystals. No significant difference in the kinetics of scintillation decay, scintillation efficiency, emission spectra, optical transmittance was observed for three ZnMoO4 crystal samples grown from the melt of stoichiometric composition, with excess of molybdenum and doped with tungsten. Using CaWO4 as reference, the absolute light yield of ZnMoO4 is found to be equal to 3550±5503550±550 ph/MeV at 77 K. For two ZnMoO4 samples 20 mm in diameter and 40 mm in length (grown from the melt of stoichiometric composition and doped with tungsten) it is confirmed that scintillation and bolometric response are similar at milli-Kelvin temperature.

Published
2015
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10. Enriched Zn $$^{100}$$ 100 MoO $$_4$$ 4 scintillating bolometers to search for $$0\nu 2\beta $$ 0 ν 2 β decay of $$^{100}$$ 100 Mo with the LUMINEU experiment

Author

V.N. Zhdankov, F.A. Danevich, Ya.V. Vasiliev, Matias Velázquez, S.G. Nasonov, A. S. Barabash, I.M. Ivanov, M. Mancuso, A. Giuliani, E. Olivieri, C. Nones, G. Pessina, V.N. Shlegel, M. Tenconi, D.V. Poda, V.I. Tretyak, D. M. Chernyak, E. P. Makarov, and S. Marnieros

Subjects
Physics, Physics and Astronomy (miscellaneous), Boule, Zinc molybdate, 010308 nuclear & particles physics, Analytical chemistry, chemistry.chemical_element, Context (language use), Zinc, 01 natural sciences, 7. Clean energy, Crystal, chemistry.chemical_compound, chemistry, Double beta decay, 0103 physical sciences, Cadmium tungstate, Neutrino, 010306 general physics, Engineering (miscellaneous)
Abstract

The LUMINEU project is a demonstrator experiment that will search for the neutrinoless double beta decay of the isotope \(^{100}\)Mo embedded in zinc molybdate (ZnMoO\(_4\)) scintillating bolometers. In this context, a zinc molybdate crystal boule enriched in \(^{100}\)Mo to 99.5 % with a mass of 171 g was grown for the first time by the low-thermal-gradient Czochralski technique. The production cycle provided a high yield (the crystal boule mass was 84 % of the initial charge) and an acceptable level—around 4 %—of irrecoverable losses of the costly enriched material. Two crystals of 59 and 63 g, obtained from the enriched boule, were tested above ground at millikelvin temperatures as scintillating bolometers. They showed a good detection performance, equivalent to that of previously developed natural ZnMoO\(_4\) detectors. These results pave the way to future sensitive searches based on the LUMINEU technology, capable of approaching and exploring the inverted hierarchy region of the neutrino mass pattern.

Published
2014
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12. Purification of molybdenum oxide, growth and characterization of medium size zinc molybdate crystals for the LUMINEU program

Author

V.Ya. Degoda, Christian Enss, Matias Velázquez, S.G. Nasonov, E. Olivieri, L. Gastaldo, M. Chapellier, V. V. Kobychev, P. Magnier, T. Redon, X. F. Navick, Oudomsack Viraphong, V.N. Shlegel, L. Devoyon, V.N. Zhdankov, O. Strazzer, S. Hervé, A. A. Drillien, Matias Rodrigues, S. Marnieros, Ya.P. Kogut, L. Torres, I.M. Ivanov, Y. Penichot, M. Gros, O. Plantevin, L. Dumoulin, G. Pessina, Rodolphe Decourt, Noël Coron, B. Paul, A. Giuliani, E. P. Makarov, Andreas Fleischmann, F. Koskas, Claire A. Marrache-Kikuchi, M. Tenconi, Laurent Bergé, Martin Loidl, R. S. Boiko, F.A. Danevich, Ya.V. Vasiliev, D. M. Chernyak, P. de Marcillac, M. Mancuso, C. Nones, D.V. Poda, and V.I. Tretyak

Subjects
Aqueous solution, Recrystallization (geology), Physics - Instrumentation and Detectors, Zinc molybdate, Physics, QC1-999, Inorganic chemistry, chemistry.chemical_element, FOS: Physical sciences, Crystal growth, Zinc, Instrumentation and Detectors (physics.ins-det), chemistry.chemical_compound, Physics and Astronomy (all), chemistry, Molybdenum, Sublimation (phase transition), Nuclear Experiment (nucl-ex), Luminescence, Nuclear Experiment
Abstract

The LUMINEU program aims at performing a pilot experiment on neutrinoless double beta decay of 100Mo using radiopure ZnMoO4 crystals operated as scintillating bolometers. Growth of high quality radiopure crystals is a complex task, since there are no commercially available molybdenum compounds with the required levels of purity and radioactive contamination. This paper discusses approaches to purify molybdenum and synthesize compound for high quality radiopure ZnMoO4 crystal growth. A combination of a double sublimation (with addition of zinc molybdate) with subsequent recrystallization in aqueous solutions (using zinc molybdate as a collector) was used. Zinc molybdate crystals up to 1.5 kg were grown by the low-thermal-gradient Czochralski technique, their optical, luminescent, diamagnetic, thermal and bolometric properties were tested., Comment: Contribution to Proc. of Int. Workshop on Radiopure Scintillators RPSCINT 2013, 17-20 September 2013, Kyiv, Ukraine; to be published in EPJ Web of Conferences; expected to be online in January 2014; 6 pages, 6 figures, and 3 tables

Published
2013
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13. Optical, luminescence and thermal properties of radiopure ZnMoO4 crystals used in scintillating bolometers for double beta decay search

Author

F.A. Danevich, I.A. Tupitsyna, V.I. Tretyak, G. Pessina, M. Tenconi, E. Olivieri, E.N. Galashov, V.Ya. Degoda, V. V. Kobychev, A. Giuliani, I.M. Ivanov, S. Marnieros, O.P. Stanovyi, Igor Dmitruk, C. Nones, D. M. Chernyak, V.N. Shlegel, Federico Ferri, V.M. Mokina, C. Rusconi, M. Mancuso, CSNSM PS1, Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)-Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), CSNSM INSTR, and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Nuclear and High Energy Physics, Zinc molybdate, Physics::Instrumentation and Detectors, Photodetector, Physics::Optics, Scintillator, 01 natural sciences, Crystal, chemistry.chemical_compound, Double beta decay, 0103 physical sciences, Cryogenic scintillating bolometer, Double beta decay 100Mo, ZnMoO4 crystal, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], 010306 general physics, Instrumentation, Physics, Scintillation, 010308 nuclear & particles physics, business.industry, chemistry, Optoelectronics, business, Luminescence, Refractive index, 100Mo
Abstract

100 Mo abstract Zinc molybdate (ZnMoO4) crystals are an excellent candidate material to fabricate scintillating bolometers for the study of neutrinoless double beta decay of 100 Mo, provided that the crystal quality meets strict optical, thermal and radiopurity requirements. This paper addresses the characterization of improved crystalline samples grown by the low-thermal-gradient Czochralski technique. Transmittance measurements confirm significant improvement of the material with respect to previously developed samples. Luminescence properties (emission spectra, dependence of intensity on temperature, thermally stimulated luminescence and phosphorescence) have been studied under X-ray excitation from liquid- helium to room temperature. The index of refraction was measured in the wavelength interval 406- 655 nm. Samples of ZnMoO4 crystals with masses of 5.07 g and 23.8 g were operated as scintillating bolometers at temperatures below 30 mK, with simultaneous detection of scintillation and heat signals, confirming an excellent alpha/beta rejection power. Background measurements allowed encouraging radiopurity level estimations. The light collection from ZnMoO4 scintillators was Monte Carlo simulated, analysing different crystal size, shape and surface properties and different photodetector sizes.

Published
2013
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14. Purification of molybdenum, growth and characterization of medium volume ZnMoO4crystals for the LUMINEU program

Author

E. P. Makarov, V.N. Shlegel, V.Ya. Degoda, V.N. Zhdankov, L. Devoyon, G. Pessina, E. Olivieri, A. A. Drillien, C. Nones, Matias Velázquez, Matias Rodrigues, O. Plantevin, S.G. Nasonov, Oudomsack Viraphong, T. Redon, P. de Marcillac, M. Tenconi, F.A. Danevich, Martin Loidl, V.V. Kobychev, P. Magnier, Noël Coron, Rodolphe Decourt, M. Chapellier, V. Humbert, Y. Penichot, I.M. Ivanov, B. Paul, Loredana Gastaldo, X-F. Navick, O. Strazzer, M. Mancuso, M. Gros, S. Hervé, R. S. Boiko, Achim Fleischmann, A. Giuliani, Christian Enss, Luc Bergé, Ya.P. Kogut, S. Marnieros, F. Koskas, Claire A. Marrache-Kikuchi, D. V. Poda, Ya.V. Vasiliev, D. M. Chernyak, V. I. Tretyak, L. Dumoulin, and L. Torres

Subjects
gas and liquid scintillators), Materials science, Zinc molybdate, Radiochemistry, Refractory metals, Hybrid detectors, chemistry.chemical_element, Crystal growth, Zinc, Scintillator, scintillation and light emission processes (solid, chemistry.chemical_compound, Cryogenic detectors, Photoemission, Scintillators, scintillation and light emission processes (solid, gas and liquid scintillators), chemistry, Molybdenum, Scintillators, Sublimation (phase transition), Luminescence, Instrumentation, Mathematical Physics
Abstract

The LUMINEU program aims at performing a pilot experiment on neutrinoless double beta decay of 100Mo using radiopure ZnMoO4 crystals operated as cryogenic scintillating bolometers. Growth of high quality radiopure crystals is a complex task, since there are no commercial molybdenum compounds available with the required level of purity and radioactive contamination. This paper discusses approaches to purify molybdenum and synthesize compounds for high quality radiopure ZnMoO4 crystal growth. A combination of a double sublimation (with addition of zinc molybdate) with subsequent recrystallization in aqueous solutions (using zinc molybdate as a collector) was used. Zinc molybdate crystals up to 1.5 kg were grown by the low-thermal-gradient Czochralski technique; their optical, luminescent, diamagnetic, thermal and bolometric properties were tested.

Published
2014
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15. Magnetorheological effect in elastomers containing uniaxial ferromagnetic particles

Author

V.M. Kalita, I.M. Ivanova, and V.M. Loktev

Subjects
magnetoactive elastomers, magnetorheological effect, critical shear, Physics, QC1-999
Abstract

The description of the collective magnetorheological effect induced by magnetic field in magnetoactive elastomers is proposed. The condition of consistency is used between magnetic and mechanic momenta of forces exerted on magnetically uniaxial ferromagnetic particles in elastomer at their magnetization. The study shows that even in the case of small concentration of particles, the value of magnetically-induced shear can be anomalously large, reaching up to tens of percent. The deformation of magnetoactive elastomer can evolve critically, as a second-order phase transition, if magnetic field is aligned along the easy axis of particles.

Published
2020
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16. Solvent extraction removal of cobalt and other impurity elements from nickel electrolytes

Author

L.M. Gindin, R.S. Maizlish, L.V. Volkov, I.M. Ivanov, A. V. Nikolaev, and V.L. Kheifez

Subjects
Aqueous solution, Extraction (chemistry), Inorganic chemistry, Metals and Alloys, chemistry.chemical_element, Electrolyte, Diluent, Chloride, Industrial and Manufacturing Engineering, Nickel, chemistry, Reagent, Materials Chemistry, medicine, Cobalt, medicine.drug
Abstract

The use of trialkylbenzylammonium chloride in polyalkyl benzene diluent is proposed for the solvent extraction removal of impurity elements (Co, Cu, Fe, Pb, Zn, Cd, As) from a nickel electrolyte containing 1.2 M Ni 2+ , 2.2. M Cl − and 0.8 M SO 4 2− . Following continuous extraction tests at overall flow rates of 8 and 50 l/h, a pilot plant installation was designed, built and operated at aqueous and organic flow rates of 570 l/h and 210 l/h, sufficient to provide purified electrolyte for 24 commercial electrolytic cells. Under suitable operating conditions the impurity content of cathode nickel did not exceed 0.01%. Two methods of operation are described involving collective and selective extraction of impurities, respectively. The advantages of the latter method, i.e. lower reagent requirements and better effluent control, are detailed.

Published
1979
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