Wavelet analysis of experimental results for coupled structural–hydraulic behavior of the EURISOL target mock-up

Milenković, Rade Ž.; Dementjevs, Sergejs; Samec, K.; Flerov, A.; Thomsen, K.

doi:10.1016/j.nima.2009.06.061

Cited by 3 publications

(3 citation statements)

References 8 publications

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“…Details of the test setup, the analysis and interpretation of the collected data will follow this first publication [12]. First indications are that the target performed as expected from the analysis, with low hydraulic losses and no significant vibrations.…”

Section: Resultsmentioning

confidence: 98%

Design of a compact high-power neutron source—The EURISOL converter target

Samec

Milenković

Dementjevs

et al. 2009

Nuclear Instruments and Methods in Physics Research Section A:

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a b s t r a c tThe EURISOL project, a multi-lateral initiative supported by the EU, aims to develop a facility to achieve high yields of isotopes in radioactive beams and extend the variety of these isotopes towards more exotic types.The neutron source at the heart of the projected facility is designed to generate isotopes by fissioning uranium carbide (UC) targets arranged around a 4 MW neutron source. For reasons of efficiency, it is essential that the neutron source be as compact as possible, to avoid losing neutrons by absorption whilst maximising the escaping neutron flux, thus increasing the number of fissions in the UC targets. The resulting configuration presents a challenge in terms of absorbing heat deposition rates of up to 8 kW/cm 3 in the neutron source; it has led to the selection of liquid metal for the target material. The current paper presents the design of a compact high-power liquid-metal neutron source comprising a specially optimised beam window concept. The design is based on two-dimensional (2D) and three-dimensional (3D) computational fluid dynamics (CFD) numerical simulations for thermal hydraulics and hydraulic aspects, as well as finite-element method (FEM) for assessing thermomechanical stability. The resulting optimised design was validated by a dedicated hydraulic test under realistic flow conditions. A full-scale mock-up was built at the Paul Scherrer Institute (PSI) and was tested at the Institute of Physics of the University of Latvia (IPUL).

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Section: Resultsmentioning

confidence: 98%

Design of a compact high-power neutron source—The EURISOL converter target

Samec

Milenković

Dementjevs

et al. 2009

Nuclear Instruments and Methods in Physics Research Section A:

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“…Initial computational studies for the configuration without flow vanes [7] indicated that incipient cavitation occurs at high flow rates and for a pressure of about 2 bar (a temperature of 50 1C was used in simulations). In the experiment at a flow rate of 10 l/s and a pressure of the cover gas of 2 bar, characteristic cavitation noise, which was also audible to the human ear, was identified as a crackling and sizzling sound and recorded by the microphone.…”

Section: Test Matricesmentioning

confidence: 99%

Structural-hydraulic test of the liquid metal EURISOL target mock-up

Milenković

Dementjevs

Samec

et al. 2009

Nuclear Instruments and Methods in Physics Research Section A:

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a b s t r a c tStructural-hydraulic tests of the European Isotope Separation On-Line (EURISOL) neutron converter target mock-up, named MErcury Target EXperiment 1 (METEX 1), have been conducted by Paul Scherrer Institut (PSI, Switzerland) in cooperation with Institute of Physics of the University of Latvia (IPUL, Latvia). PSI proceeded with extensive thermal-hydraulic and structural computational studies, followed by the target mock-up tests carried out on the mercury loop at IPUL.One of the main goals of the METEX 1 test is to investigate the hydraulic and structural behaviour of the EURISOL target mock-up for various inlet flow conditions (i.e. mass flow rates) and, in particular, for nominal operating flow rate and pressure in the system. The experimental results were analysed by advanced time-frequency methods such as Short-Time Fourier Transform in order to check the vibration characteristics of the mock-up and the resonance risk. The experimental results (obtained in METEX 1), which include inlet flow rate, pressure of the cover gas, total pressure loss, structural acceleration, sound and strain data, were jointly analysed together with numerical data obtained from Computational Fluid Dynamics (CFD).

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“…[7][8][9]. Studies conducted in the past by different researchers highlight the importance of these effects on the target system [10,11]. The liquid-metal-loop target is one of the foreseen 100-kW EURISOL direct targets and is also of interest for the ISOL@MYR-RHA facility.…”

Section: Introductionmentioning

confidence: 99%

CFD analysis and optimization of a liquid lead–bismuth loop target for ISOL facilities

Houngbo

Popescu

Schuurmans

et al. 2015

Nuclear Instruments and Methods in Physics Research Section A:

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a b s t r a c tIn the context of the forthcoming next generation of Radioactive Ion Beams (RIBs) facilities based on an Isotope Separation On Line (ISOL) method, the development of production targets capable of dissipating the high power deposited by the primary beam is a major challenge. The concept of a high-power target based on a liquid Pb-Bi loop incorporating a heat-exchanger and a diffusion chamber was proposed within EURISOL DS and is being developed within the LIEBE 1 project. Due to the non-static character of the target, specific hydrodynamics issues are of concern. In this paper, these issues are studied mostly based on three-dimensional (3D) Computational Fluid Dynamics analysis of the flow of the Lead Bismuth Eutectic (LBE) target, resulting in optimized designs. The concept and hydrodynamic challenges of generating RIBs from a liquid-metal-loop target irradiated with a high-power primary beam are presented. The optimization of the target design has been conducted keeping in mind the need for a fast and efficient release of short-lived isotopes. This study shows that approximately 100 ms after the proton pulse the irradiated liquid-metal is entirely and uniformly evacuated from the irradiation volume and spread in a shower of small droplets (100-μm radii), in order to reduce the diffusion length of isotopes. Solutions to deal with the typical cavitation risk due to the presence of low-pressure zones in the liquid have also been found and simulated.

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Wavelet analysis of experimental results for coupled structural–hydraulic behavior of the EURISOL target mock-up

Cited by 3 publications

References 8 publications

Design of a compact high-power neutron source—The EURISOL converter target

Design of a compact high-power neutron source—The EURISOL converter target

Structural-hydraulic test of the liquid metal EURISOL target mock-up

CFD analysis and optimization of a liquid lead–bismuth loop target for ISOL facilities

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