Dose dependence of mechanical properties in tantalum and tantalum alloys after low temperature irradiation

Byun, Thak Sang; Maloy, S.A.

doi:10.1016/j.jnucmat.2008.02.034

Cited by 42 publications

(17 citation statements)

References 10 publications

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“…Also these metals have been shown to be extremely resistant to radiation damage effects in the ISIS target [9] up to 12 dpa (similar to the Neutrino Factory target after 10 years of use). However, other studies [10][11][12] have indicated embrittlement and helium swelling. This discrepancy is not understood and will need further investigation.…”

Section: The Neutrino Factory Targetmentioning

confidence: 98%

Thermal shock measurements and modelling for solid high-power targets at high temperatures

Bennett

Škoro

Booth

et al. 2008

Journal of Nuclear Materials

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Section: The Neutrino Factory Targetmentioning

confidence: 98%

Thermal shock measurements and modelling for solid high-power targets at high temperatures

Bennett

Škoro

Booth

et al. 2008

Journal of Nuclear Materials

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“…After 800MeV proton irradiation up to 11 displacements per atom (dpa), the tantalum retained significant ductility. Other tantalum specimens were irradiated using reactor neutrons at the High Flux Isotope Reactor (HFIR) [20]. After > 0.1MeV fast neutron irradiation up to 0.14dpa, the tantalum was ductile at 0.04dpa but much more brittle after only 0.14dpa.…”

Section: Review Of Tantalum Irradiation Datamentioning

confidence: 99%

Stress levels and failure modes of tantalum-clad tungsten targets at ISIS

Wilcox

Loveridge

Davenne

et al. 2018

Journal of Nuclear Materials

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The ISIS spallation neutron source operates two tantalum-clad targets. Efforts to understand the operating conditions and lifetime limiting factors of these targets are ongoing, driven in part by premature failures of several recent TS2 targets. The Hot Isostatic Press (HIP) process used in target manufacturing is thought to introduce large residual stresses, particularly in the tantalum cladding. In addition, the pre-stressed target materials are subjected to cyclic proton beam heating and irradiation damage during operation. Manufacturing and beam-induced stresses were simulated using finite element analysis. The residual stress simulation results appear largely consistent with the findings from recent neutron diffraction measurements on an ISIS target plate. Simulations of the beam induced cyclic stress in the target, together with the available tantalum fatigue data, indicate that there is a large safety margin on the material fatigue limit and that a fatigue failure in the ISIS target cladding is therefore unlikely.

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“…A high safety factor is required for these materials in terms of static stress and fatigue life in order to increase operational robustness. Ta2.5W has been reported to maintain its ductility and increase slightly its strength after irradiation, especially if high purity material is used [35,36].…”

Section: Target Materials Properties Reviewmentioning

confidence: 99%

Design of a high power production target for the beam dump facility at CERN

Lopez-Sola

Calviani

Avigni

et al. 2019

Phys. Rev. Accel. Beams

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The Beam Dump Facility (BDF) project is a proposed general-purpose facility at CERN, dedicated to beam dump and fixed target experiments. In its initial phase, the facility is foreseen to be exploited by the Search for Hidden Particles (SHiP) experiment. Physics requirements call for a pulsed 400 GeV/c proton beam as well as the highest possible number of protons on target (POT) each year of operation (4.0 · 10 13 /year), in order to search for feebly interacting particles. The target/dump assembly lies at the heart of the facility, with the aim of safely absorbing the full high intensity Super Proton Synchrotron (SPS) beam, while maximizing the production of charmed and beauty mesons. High-Z materials are required for the target/dump, in order to have the shortest possible absorber and reduce muon background for the downstream experiment. The design of the production target is one of the most challenging aspects of the facility design, due to the high energy and power density deposition that are reached during operation, and the resulting thermomechanical loads. The nature of the beam pulse induces very high temperature excursions between pulses (up to 100 • C), leading to considerable thermally-induced stresses and long-term fatigue considerations. The high average power deposited on target (305 kW) creates a challenge for heat removal. During the BDF facility Comprehensive Design Study (CDS), launched by CERN in 2016, extensive studies have been carried out in order to define and assess the target assembly design. These studies are described in the present contribution, which details the proposed design of the BDF production target, as well as the material selection process and the optimization of the target configuration and beam dilution. One of the specific challenges and novelty of this work is the need to consider new target materials, such as a molybdenum alloy (TZM) as core absorbing material and Ta2.5W as cladding. Thermo-structural and fluid dynamics calculations have been performed to evaluate the reliability of the target and its cooling system under beam operation. In the framework of the target comprehensive design, a preliminary mechanical design of the full target assembly has also been carried out, assessing the feasibility of the whole target system.

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Dose dependence of mechanical properties in tantalum and tantalum alloys after low temperature irradiation

Cited by 42 publications

References 10 publications

Thermal shock measurements and modelling for solid high-power targets at high temperatures

Thermal shock measurements and modelling for solid high-power targets at high temperatures

Stress levels and failure modes of tantalum-clad tungsten targets at ISIS

Design of a high power production target for the beam dump facility at CERN

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