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

Wilcox, D.; Loveridge, P.; Davenne, T.; Jones, L.; Jenkins, David

doi:10.1016/j.jnucmat.2017.10.075

Cited by 19 publications

(19 citation statements)

References 12 publications

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“…Preliminary measurements of residual strain in a HIPed ISIS target plate have been carried out using neutron diffraction [5]. The results compared reasonably well with simulations of residual stress, as previously reported [4]. The experiment allowed the successful determination of two out of three strain components, but this was not enough to fully reconstruct the stress state in the material, so it was not possible to make an estimate of lock-in temperature.…”

Section: Introductionsupporting

confidence: 55%

“…HIP-induced residual stress is currently an important but unknown factor in simulations of stress levels in ISIS targets. Finite Element Analysis (FEA) results indicate that residual stress, rather than beam-induced heating, is predicted to be the largest contribution to stress in tantalum for both TS1 and TS2 ISIS targets [4]. For simulation purposes, it is assumed that the residual stress is entirely due to differential thermal contraction between tantalum and tungsten as the part cools down after HIPing.…”

Section: Introductionmentioning

confidence: 99%

“…Estimating this lock-in temperature is an important step towards accurately simulating residual stress. More details of the standard ISIS HIP cycle and the methods and assumptions for simulating HIP stress can be found in [4].…”

Section: Introductionmentioning

confidence: 99%

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Measurement of residual strain in tantalum-clad tungsten after hot isostatic pressing

Wilcox

Loveridge

Kabra

et al. 2020

JNR

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Tantalum-clad tungsten targets are a popular choice for spallation neutron production, due to the combination of high neutron yield and corrosion resistance. Such targets typically use the Hot Isostatic Press (HIP) process to bond the cladding to the core; this produces a strong bond but also introduces large residual stresses in the target and cladding. This is of particular interest at the ISIS neutron source, because cladding breaches are currently believed to limit the lifetime of ISIS TS2 targets. Two different and complementary methods were used to measure the residual strain in a tantalum-clad tungsten strip manufactured using the same HIP process as ISIS targets. The strip was produced with deliberately asymmetric cladding, causing it to deflect in proportion to the residual stress. FEA simulations were used to back-calculate the stress from the measured deflection. The strip was then placed on the ISIS instrument ENGIN-X, which allowed detailed through-thickness strain profiles to be measured via neutron diffraction. The results of both methods confirm the presence of large residual strains, and agree reasonably well with FEA simulations of the cladding process.

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Section: Introductionsupporting

confidence: 55%

Section: Introductionmentioning

confidence: 99%

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Measurement of residual strain in tantalum-clad tungsten after hot isostatic pressing

Wilcox

Loveridge

Kabra

et al. 2020

JNR

Self Cite

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“…A neutron beam is typically generated by one of the following two methods:[1d] (1) Fission of a radioactive nuclide such as U‐235 in a reactor (known as reactor sources );[1d] (2) Spallation of a heavy metal target such as mercury,, tungsten, or lead by a high‐energy proton beam (known as a spallation source).…”

Section: Overview Of Neutron Generation Diffraction and Inelastimentioning

confidence: 99%

Neutron Instruments for Research in Coordination Chemistry

et al. 2019

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Neutron diffraction and spectroscopy offer unique insight into structures and properties of solids and molecular materials. All neutron instruments located at the various neutron sources are distinct, even if their designs are based on similar principles, and thus, they are usually less familiar to the community than commercial X‐ray diffractometers and optical spectrometers. Major neutron instruments in the USA, which are open to scientists around the world, and examples of their use in coordination chemistry research are presented here, along with a list of similar instruments at main neutron facilities in other countries. The reader may easily and quickly find from this minireview an appropriate neutron instrument for research. The instruments include single‐crystal and powder diffractometers to determine structures, inelastic neutron scattering (INS) spectrometers to probe magnetic and vibrational excitations, and quasielastic neutron scattering (QENS) spectrometers to study molecular dynamics such as methyl rotation on ligands. Key and unique features of the diffraction and neutron spectroscopy that are relevant to inorganic chemistry are reviewed.

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“…In order to avoid undesired corrosion/erosion effects induced by the high-speed water in contact with pure W and TZM, all the blocks are cladded via diffusion bonding achieved by means of Hot Isostatic Pressing (HIP) with either Ta or Ta2.5W-alloy, due to their high erosion/corrosion resistance and convenience as high-Z material [8,9].…”

Section: Bdf Target Designmentioning

confidence: 99%

Design Development for the Beam Dump Facility Target Complex at CERN

Kershaw¹,

Grenard²,

Calviani³

et al. 2018

J. Inst.

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A: CERN has launched a study phase to evaluate the feasibility of a new high-intensity beam dump facility at the CERN Super Proton Synchrotron accelerator with the primary goal of exploring Hidden Sector models and searching for Light Dark Matter, but which also offers opportunities for other fixed target flavour physics programs such as rare tau lepton decays and tau neutrino studies. The new facility will require -among other infrastructure -a target complex in which a dense target/dump will be installed, capable of absorbing the entire energy of the beam extracted from the SPS accelerator. In theory, the target/dump could produce very weakly interacting particles, to be investigated by a suite of particle detectors to be located downstream of the target complex. As part of the study, a development design of the target complex has been produced, taking into account the handling and remote handling operations needed through the lifetime of the facility. Two different handling concepts have been studied and both resulting designs are presented.

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

Cited by 19 publications

References 12 publications

Measurement of residual strain in tantalum-clad tungsten after hot isostatic pressing

Measurement of residual strain in tantalum-clad tungsten after hot isostatic pressing

Neutron Instruments for Research in Coordination Chemistry

Design Development for the Beam Dump Facility Target Complex at CERN

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