Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Subject Area and Category
- Instrumentation
- Nuclear and High Energy Physics
Elsevier B.V.
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Ion beam alignment for liquid crystal display fabrication
The ability to align liquid crystals to a substrate is a critical step in the liquid crystal display (LCD) manufacturing process with the industry standard technique employing a mechanical rubbing technique to accomplish this function. However, mechanical rubbing can result in debris generation contaminating not only the substrate being processed but also the clean room housing the equipment. As such, post-cleaning of the display panels is required to remove the debris from the surface in addition to the physical isolation of the mechanical rubbing equipment within the clean room environment introducing considerable time and expense. In addition, uneven wear of the mechanical roller during the rubbing process may result in localized defects that will not be observed until final inspection of a completely assembled display. We have developed and introduced into LCD manufacturing a non-contact alignment technique utilizing both diamond-like carbon (DLC) and a low energy ion beam (IB). The replacement of the polyimide alignment layer with DLC results in a completely dry processing technique for both the thin film deposition and alignment steps. © 2003 Elsevier Science B.V. All rights reserved.
Publication
- P. Chaudhari
- E. Galligan
- A.C. Callegari
- Y. Nakagawa
Microdiffraction Patterns from the Finney Model
Properties of epitaxial films of yba2cu3o7-, spatially resolved observation of charge transfer across single grain boundaries in ybacuo films.
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May 29, 2024
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Gamma tomography of spent nuclear fuel for geological repository safeguards
by University of Helsinki
All spent nuclear fuel that will be deposited in the bedrock will be measured with a method and device that have been developed in a doctoral research thesis being defended on 4 June 2024 at the University of Helsinki. The final disposal operations are being prepared to start next year in Finland.
At Olkiluoto in Eurajoki, preparations are underway to start the disposal of spent nuclear fuel in the Finnish bedrock next year—as the first place in the world.
After use, nuclear fuel becomes strongly radiating and dangerous waste. It contains a large amount of uranium and plutonium, which are building blocks for nuclear weapons . All these materials must be intact when the fuel rods are stored in their final deposit. This is why they must be meticulously and dependably measured before depositing them.
"This way, we can be sure of what is being deposited in the bedrock, and that all nuclear materials will remain in peaceful use," says visiting researcher Riina Virta at the University of Helsinki.
All the important information must be gathered before the final disposal. The measurements must also be stored in a way that will be accessible and understandable to human beings for thousands, even hundreds and thousands of years.
For her doctoral thesis , Virta has studied measuring methods for nuclear waste at the University of Helsinki in cooperation with the Helsinki Institute of Physics (HIP). Virta also works as an inspector in the nuclear materials safeguards section of the Radiation and Nuclear Safety Authority.
Gamma camera sees inside assembly
In her thesis work, Virta developed a PGET device, i.e. an imaging method called passive gamma emission tomography, which measures the gamma radiation emitted by spent nuclear fuel. Nuclear fuel consists of rods, a few meters long and containing uranium, which are gathered into an assembly to act as a fuel element. The PGET instrument can produce an exact cross-section image of the fuel assembly.
The cross-section image allows us to check that the assembly still retains all the rods. The challenging thing with this method is that the fuel dampens the radiation very efficiently.
"In practice, the radiation from the middle of the assembly just barely reaches the detector, i.e. the 'camera.' We wanted to fix this problem in our research," notes Virta.
The image quality was improved e.g. by developing the collection of data and using that data more wisely. The method was also developed so that the instrument can be used, not just in water, but in air, as well. This makes it adaptable to the Finnish plants taking care of the final disposal. The research also developed software tools to make the operative application of the method easier.
The performance of the method was proven with the help of an extensive library of field measurements carried out in Finnish nuclear power plants.
"This means the method has been studied in detail and found to work well, and now we are just waiting for the operations of final disposal to start in Olkiluoto," says Virta.
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Nuclear Instruments and Methods in Physics Research - section A (NIM-A) publishes papers on design, development and performance of scientific instruments including complex detector systems and large scale facilities which utilize or study ionizing radiation. This scope includes the development of … View full aims & scope $
About the journal. Formerly known as Nuclear Instruments and Methods; Continued as Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment and Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms;
0168-583X. Links. Journal homepage. Nuclear Instruments and Methods in Physics Research (Nucl. Instrum. Methods Phys. Res.) is a peer-reviewed scientific journal published by Elsevier. It was established in 1957 as Nuclear Instruments. It focuses on detectors descriptions and data analysis methods.
NIM-B accepts original manuscripts on the fundamental interactions between energetic particle beams and matter, along with related technologies and applications.. Relevant manuscripts will address one or more of the following areas: Interactions between matter and beams of charged or neutral particles: Atoms, molecules, atomic clusters, neutrons, photons, electrons, and ions.
the ''nuclear corridor" that would increase the dechanneling probability. A plot of the potential for our crystal is shown in Fig. 1 of Ref. [8]. These experiments—which have produced a body of data important for any practical application of crystals in colli-mation or other manipulations of electron beams at high
method of coupling a photodetector to scintillating crystals is to have two matching matrices, with a one-to-one coupling between the crystal and the photodetector. We propose a new geometry based on analogue strip SiPMs
/ Nuclear Instruments and Methods in Physics Research A 00 (2019) 1-8 3 Figure 1. Photographs of the ˚25 45 mm CdMoO4 crystal tested as a scintillating bolometer. (a) (b) Figure 2. The 134.1 g CdMoO4 scintillating bolometer assembled inside a copper frame covered by reflecting foil. A Kapton pad is used as the
The use of this laser for in-source RIS required motorization of the two eta-lons and a computer-controlled performance monitoring and opti-mization (power, line-width) and stabilization (wavelength). This is realized by the use of a new RILIS monitoring, control and DAQ system, as described in [25].
The rotating search coil is a commonly used tool to measure magnetic elds of accelerator magnets. The coil. intercepts the magnetic ux at a radius given by the dimensions of the measurement shaft that comprises a set fl of search coils for the analog bucking of the main signal from the dipole eld component.
Nuclear Instruments and Methods in Physics Research - section A (NIM-A) publishes papers on design, development and performance of scientific instruments including complex detector systems and large scale facilities which utilize or study ionizing radiation.
An activation detector has been developed for measuring the output of pulsed neutron generators. This detector utilizes the 75As (n, n′)75mAs reaction and detection of the 0.3 MeV gamma rays ...
The in uence of crystal properties, such as density, fl light yield and decay kinetics on the timing performance is discussed. The best single detector time resolutions are in the range of 23-30 ps (sigma) and only achieved by codoping the garnet crystals with divalent ions, such as Mg2+.
Continued as Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment and Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms;
Nuclear Instruments and Methods in Physics Research. Nuclear Instruments and Methods in Physics Research 00 (2018) 01-18. Page2 of18. Novel Silicon Photomultipliers suitable for Dual-Mirror Small-Sized Telescopes of the Cherenkov Telescope Array. G. Romeoa , G. Bonannoa, bG.
Section A of Nuclear Instruments and Methods in Physics Research publishes papers on design, manufacturing and performance of scientific instruments with an emphasis on large scale facilities. This includes the development of particle accelerators, ion sources, beam transport systems and target arrangements as well as the use of secondary ...
The instrument recorded data for the whole deployment period within the expected specifications. This monitoring provided, for the first time, a continuous time-series of radioactivity in deep-sea.
The fundamental physics and technical development of materials analysis using energetic beams - including all forms of ion beam analysis, accelerator mass spectrometry, positron annihilation spectroscopy, neutron scattering and diffraction, as well as synchrotron-based methods.
Nuclear Instruments and Methods in Physics Research Thermoset and thermoplastic polyimides have complementary physical/mechanical properties. Whereas thermoset polyimides are brittle and generally easier to process, thermoplastic polyimides are tough but harder to process.
nuclear reactors. Specialized electronics for nuclear and other types of spectrometry as well as computerization of measurements and control systems in this area also fi nd their place. Theoretical as well as experimental papers are accepted. Publication Information Nuclear Instruments and Methods in Physics Research-Section A (ISSN 0168-9002).
US Mailing notice -Nuclear Instruments and Methods in Physics Research- Section A (ISSN 0168-9002) is published semi-monthly with one additional issue in January, April, September, November and December (total 29 issues) by Elsevier Science B.V., Molenwerf 1, P.O. Box 211, 1000 AE Amsterdam, The Netherlands. Annual subscription price in the USA
Ion beam alignment for liquid crystal display fabrication for Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms by J. Doyle et al.
Award Instrument: Standard Grant: ... The proposed research deals with time-dependent studies of electron and nuclear dynamics in molecular systems. In order to predict electron transfer rates and to distinguish between various transfer mechanisms, the investigators propose to use time-dependent variational principles and model wavefunctions ...
More information: Thesis: Gamma tomography of spent nuclear fuel for geological repository safeguards. All spent nuclear fuel that will be deposited in the bedrock will be measured with a method and device that have been developed in a doctoral research thesis being defended on 4 June 2024 at the University of Helsinki.
This journal enables you to publish research objects related to your original research - such as data, methods, protocols, software and hardware - as an additional paper in a Research Elements journal. Research Elements is a suite of peer-reviewed, open access journals which make your research objects findable, accessible and reusable.
We have an opening for a Postdoctoral Researcher to independently work on laser-material interactions with emphasis on laser ablation, laser shock physics, and dynamic compression of material. Particular interest will be shown to candidates with hands-on laboratory experience, experience in developing diagnostics for laser shock physics, and advanced analysis of data to validate simulation ...
Read the latest articles of Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms at ScienceDirect.com, Elsevier's leading platform of peer-reviewed scholarly literature
Chloroplasts and mitochondria, descendants of ancient prokaryotes via endosymbiosis, occupy a pivotal position in plant growth and development due to their intricate connections with the nuclear genome. Genes encoded by the nuclear genome but relocated to or being functional within these organelles are commonly referred as organelle-targeting nuclear genes (ONGs). These genes are essential for ...