Powerful pulsed neutron sources for research with a pulsed magnetic field
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Powerful Pulsed Neutron Sources for Research with a Pulsed Magnetic Field V. V. Nietz Joint Institute for Nuclear Research, Dubna, Moscow oblast, 141980 Russia e-mail: [email protected] Received January 12, 2007
Abstract—The prospects for neutron investigations into the magnetic properties of condensed matter with the use of powerful pulsed neutron sources [Japan Spallation Neutron Source (JSNS) (Tokai, Japan), TIRAN (Zababakhin All-Russia Research Institute of Technical Physics, Russian Federal Nuclear Center, Snezhinsk, Russia), Large Hadron Collider (LHC) (CERN)] and pulsed magnetic fields are considered. It is demonstrated that the diffraction measurements of the magnetic states induced by a magnetic field of up to 700–1000 kOe can be performed at the TIRAN reactor and the neutron source that can be developed on the basis of the LHC accelerator. PACS numbers: 29.25.Dz, 29.30.Hs, 61.12.Ld DOI: 10.1134/S1063774508030243
At present, the maximum magnetic fields used in neutron investigations of condensed matter in the majority of cases have not exceeded 120–130 kOe and superconducting permanent magnets with field strengths up to 160 kOe have been employed at only two laboratories [1–3]. There exists only one spectrometer designed for performing neutron investigations with the use of pulsed magnetic fields, namely, the SNIM-2 spectrometer [4, 5] at the IBR-2 pulsed reactor of periodic operation (the reactor operates at a repetition rate of 5 pulses/s). It should be noted that the IBR-2 reactor is superior to all the other existing pulsed sources of periodic operation in conditions for the performance of experiments with pulsed fields up to 250–300 kOe. The main factor that prevents a further increase in the field strength in experiments consists in failing magnets at high current pulses. This does not allows one to accumulate sufficient information in neutron scattering. Therefore, the employment of pulsed neutron sources that provide peak thermal neutron fluxes higher than those at the IBR-2 reactor will permit one to obtain necessary information with a smaller number of current pulses and, hence, to expand the range of magnetic fields used. In this paper, we consider the following three neutron sources that ensure or can ensure the most intense neutron fluxes and hold promise for investigations into the magnetic properties of materials with the use of superstrong magnetic fields: (1) the Japan Spallation Neutron Source (JSNS) (Tokai, Japan), which should be put in operation in 2007 [6, 7];
(2) the TIRAN reactor (the reactor complex of onetime action Bars-5 with the reactor multiplier of neutrons; this reactor exists at the Zababakhin All-Russia Research Institute of Technical Physics, Russian Federal Nuclear Center, Snezhinsk, Russia) [8, 9]; and (3) the LHC neutron source [this source will be developed on the basis of the Large Hadron Collider (LHC), CERN] [10–12]. The experimental conditions at these sources are comparable to the experimental conditions of operation with the SNIM-2 spectro
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