A5044489080- Aluminum Alloy Microstructure Properties
- Fusion materials and technologies
- Fatigue and fracture mechanics
- Nuclear Physics and Applications
- Graphite, nuclear technology, radiation studies
- Electrospun Nanofibers in Biomedical Applications
- Particle accelerators and beam dynamics
- Superconducting Materials and Applications
- Ion-surface interactions and analysis
- Aluminum Alloys Composites Properties
- Metal and Thin Film Mechanics
- Nuclear Materials and Properties
- Bauxite Residue and Utilization
- Diamond and Carbon-based Materials Research
- Technology Assessment and Management
- Advanced Machining and Optimization Techniques
- Railway Engineering and Dynamics
- Metallurgy and Material Forming
- Hydrogen embrittlement and corrosion behaviors in metals
- Innovations in Concrete and Construction Materials
- Particle Accelerators and Free-Electron Lasers
- Mechanical stress and fatigue analysis
- Muon and positron interactions and applications
- Engineering Applied Research
- High-Velocity Impact and Material Behavior
Fermi National Accelerator Laboratory
2017-2024
National Institute for Materials Science
2013-2015
University of Fukui
2011
The University of Tokyo
2010-2011
Tohoku University
2007
Indian Institute of Technology Bombay
2003
As beam power continues to increase in next-generation accelerator facilities, high-power target systems face crucial challenges. Components like windows and particle-production targets must endure significantly higher levels of particle fluence. The primary beam's energy deposition causes rapid heating (thermal shock) induces microstructural changes (radiation damage) within the material. These effects ultimately deteriorate components' properties lifespan. With conventional materials...
In an effort to develop and design next generation high power target materials for particle physics research, the possibility of fabricating nonwoven metallic or ceramic nanofibers by electrospinning process is explored. A low-cost unit set up in-house production various nanofibers. Yttria-stabilized zirconia are successfully fabricated a mixture zirconium carbonate with high-molecular weight polyvinylpyrrolidone polymer solution. Some inherent weaknesses like thickness nanofiber mat slow...
Beryllium is a material extensively used in various particle accelerator beam lines and target facilities, as windows and, to lesser extent, secondary production targets. With increasing intensities of future multimegawatt these components will have withstand even greater thermal mechanical loads during operation. As result, it critical understand the beam-induced shock limit beryllium help reliably operate without having compromise efficiency by limiting parameters. part RaDIATE (radiation...
Novel beam-intercepting materials and targetry concepts are essential to improve the performance, reliability operation lifetimes of next generation multi-megawatt (multi-MW) accelerator target facilities. The components must sustain an order-of-magnitude increase in particle beam intensities beyond current state-of-the-art. With conventional already limiting scope experiments, it is crucial investigate novel materials, technologies that will satisfy requirements maximize physics benefits...
The geometric features of clustered shrinkage pores (CSP) in ill-conditioned aluminum alloy die castings were revealed and their effect on the fatigue strength was discussed. To obtain CSP, an observation using a commercial microfocus X-ray computed tomography (X-ray CT) system carried out position size CSP confirmed. However, detailed geometry could not be clearly observed by CT, because each pore too small to observe owing insufficient resolution CT image. We developed serial sectioning...
In many high energy physics neutrino beamlines, targets are made up of isotropic POCO graphite grade for production neutrinos particle research and bombarded with highly energetic pulsed proton beam. The beam a small size creates thermal stress waves as well radiation damage such displacement damage, void formation, swelling, gas formation amongst others. As result, after few years operation one the longest operated appears to have undergone bulk swelling fractured along centerline. A...
Rolling Contact Fatigue (RCF) is a major cause of rail failure leading to replacement rails. RCF defects are caused by combination high normal and tangential stresses between the wheel rail. In this study, methodology has been proposed evaluate P-F (Potential failure-functional failure) interval based on defect rate distribution fatigue design life distribution. For estimating distribution, load under variable amplitude considered which case in mixed traffic scenario. Stochastic S-N curve...
The next generation of high power targets will use more complex geometries, novel materials, and new concepts (like flowing granular materials); however, the current numerical approaches not be sufficient to converge towards a reliable target design that satisfies physical requirements. We discuss what can improved in 10 years modeling support (MW class) targets.
A methodology to evaluate the effect of gas pores on fatigue life aluminium die casts is proposed in terms stress concentration factor. As observed many tests, it not always case that largest sized pore initiates crack. So we need consider interactions between based their configuration, shapes and sizes. Stress concentrations around irregular shaped play important roles crack initiation consequent life. In present study, an empirical formulation elastic factor a pair spherical cavities...
An empirical prediction method for the fatigue strength considering effect of porosity was proposed. We prepared six types specimen ADC12 high pressure die cast aluminum alloy, where casting condition different to each other, and obtained S-N curve type from test. The volume fraction all specimens calculated using X-ray CT images. image-based finite element analysis also carried out evaluate maximum first principal stress corresponding nominal amplitude in referred as local amplitude, its...
Effect of casting defects on the fatigue strength die cast aluminum alloy was addressed through tension-compression test and X-ray CT inspection, which revealed amount porosity included in specimen. Six types condition were employed to examine effect different porosity. Most crack sources pores. The volume fraction calculated for all specimens from three-dimensional images. limit each specimen type estimated results. correlations among limit, fraction, Vickers hardness, dendrite arm spacing...
High Power Target systems are key elements in future neutrino and other rare particle production accelerators. These transform an intense source of protons into secondary particles interest to enable new scientific discoveries. As beam intensity energies increase, target face significant challenges. Radiation damages thermal shocks materials were identified as the leading cross-cutting challenges high-power facilities. material R&D address these essential ensure reliable operation...
High-Entropy Alloys and Electrospun Nanofiber materials are two novel classes of that can offer improved resistance to beam-induced radiation damage thermal shock. Research develop these new specifically for multi-megawatt accelerator target applications, such as beam windows particle-production targets, has recently begun. The research program will combine in-beam experiments with complementary simulations tailor the microstructures use in next-generation facilities. Iterative optimize...
As beam power continues to increase in next-generation accelerator facilities, high-power target systems face crucial challenges. Components like windows and particle-production targets must endure significantly higher levels of particle fluence. The primary beam's energy deposition causes rapid heating (thermal shock) induces microstructural changes (radiation damage) within the material. These effects ultimately deteriorate components' properties lifespan. With conventional materials...
Series of slow strain rate tests (SSRT) were conducted on moderately sensitized austenitic stainless steel in diluted aqueous solution sodium thiosulfate at ambient temperature and pressure. Only a small area the test piece was exposed to electrochemical potential transients obtained during straining used detect an initiation or precursor event stress corrosion crack (SCC). Tests stopped intermittently after getting transients, so as not allow propagate observe morphology very initial stage...
Background:➢ Sample surface is altered by interacting with proton beam e.g., swelling on order of microns (Fig 4) ➢ Existing devices are typically very expensive and produce large data files that hard to handle.
Nanofibers are produced in the Targeted Systems Department (TSD) by applying a large voltage to nanofiber fluid and collection apparatus known as electrospinner. The fiber is then shot out of nozzles collected onto electrospinner into mat. problem that since nozzle heads stationary, there non-uniform deposition on drum leading variation thickness To mitigate this issue, reciprocating mechanism designed move along collector with ability vary its stroke length. This design was realized using...