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https://www.readbyqxmd.com/read/27910697/sensitivity-of-magnetic-field-line-pitch-angle-measurements-to-sawtooth-events-in-tokamaks
#1
J Ko
The sensitivity of the pitch angle profiles measured by the motional Stark effect (MSE) diagnostic to the evolution of the safety factor, q, profiles during the tokamak sawtooth events has been investigated for Korea Superconducting Tokamak Advanced Research (KSTAR). An analytic relation between the tokamak pitch angle, γ, and q estimates that Δγ ∼ 0.1° is required for detecting Δq ∼ 0.05 near the magnetic axis (not at the magnetic axis, though). The pitch angle becomes less sensitive to the same Δq for the middle and outer regions of the plasma (Δγ ∼ 0...
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27910618/faraday-cup-type-lost-fast-ion-detector-on-heliotron-j
#2
S Yamamoto, K Ogawa, M Isobe, D S Darrow, S Kobayashi, K Nagasaki, H Okada, T Minami, S Kado, S Ohshima, G M Weir, Y Nakamura, S Konoshima, N Kemmochi, Y Ohtani, T Mizuuchi
A Faraday-cup type lost-fast ion probe (FLIP) has been designed and installed in Heliotron J for the purpose of the studies of interaction between fast ions and MHD instabilities. The FLIP can measure the co-going fast ions whose energy is in the range of 1.7-42.5 keV (proton) and pitch angle of 90(∘)-140(∘), especially for fast ions having the injection energy of neutral beam injection (NBI). The FLIP successfully measured the re-entering passing ions and trapped lost-fast ions caused by fast-ion-driven energetic particle modes in NBI heated plasmas...
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27910591/imaging-motional-stark-effect-measurements-at-asdex-upgrade
#3
O P Ford, A Burckhart, R McDermott, T Pütterich, R C Wolf
This paper presents an overview of results from the Imaging Motional Stark Effect (IMSE) diagnostic obtained during its first measurement campaign at ASDEX Upgrade since installation as a permanent diagnostic. A brief overview of the IMSE technique is given, followed by measurements of a standard H-mode discharge, which are compared to equilibrium reconstructions showing good agreement where expected. The development of special discharges for the calibration of pitch angle is reported and safety factor profile changes during sawteeth crashes are shown, which can be resolved to a few percent due to the high sensitivity at good time resolution of the new IMSE system...
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27910558/preliminary-measurements-of-the-edge-magnetic-field-pitch-from-2-d-doppler-backscattering-in-mast-and-nstx-u-invited
#4
R G L Vann, K J Brunner, R Ellis, G Taylor, D A Thomas
The Synthetic Aperture Microwave Imaging (SAMI) system is a novel diagnostic consisting of an array of 8 independently phased antennas. At any one time, SAMI operates at one of the 16 frequencies in the range 10-34.5 GHz. The imaging beam is steered in software post-shot to create a picture of the entire emission surface. In SAMI's active probing mode of operation, the plasma edge is illuminated with a monochromatic source and SAMI reconstructs an image of the Doppler back-scattered (DBS) signal. By assuming that density fluctuations are extended along magnetic field lines, and knowing that the strongest back-scattered signals are directed perpendicular to the density fluctuations, SAMI's 2-D DBS imaging capability can be used to measure the pitch of the edge magnetic field...
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27910528/compact-and-multi-view-solid-state-neutral-particle-analyzer-arrays-on-national-spherical-torus-experiment-upgrade
#5
D Liu, W W Heidbrink, K Tritz, E D Fredrickson, G Z Hao, Y B Zhu
A compact and multi-view solid state neutral particle analyzer (SSNPA) diagnostic based on silicon photodiode arrays has been successfully tested on the National Spherical Torus Experiment-Upgrade. The SSNPA diagnostic provides spatially, temporally, and pitch-angle resolved measurements of fast-ion distribution by detecting fast neutral flux resulting from the charge exchange (CX) reactions. The system consists of three 16-channel subsystems: t-SSNPA viewing the plasma mid-radius and neutral beam (NB) line #2 tangentially, r-SSNPA viewing the plasma core and NB line #1 radially, and p-SSNPA with no intersection with any NB lines...
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27910499/conceptual-design-of-the-iter-fast-ion-loss-detector
#6
M Garcia-Munoz, M Kocan, J Ayllon-Guerola, L Bertalot, Y Bonnet, N Casal, J Galdon, J Garcia Lopez, T Giacomin, J Gonzalez-Martin, J P Gunn, M C Jimenez-Ramos, V Kiptily, S D Pinches, M Rodriguez-Ramos, R Reichle, J F Rivero-Rodriguez, L Sanchis-Sanchez, A Snicker, G Vayakis, E Veshchev, Ch Vorpahl, M Walsh, R Walton
A conceptual design of a reciprocating fast-ion loss detector for ITER has been developed and is presented here. Fast-ion orbit simulations in a 3D magnetic equilibrium and up-to-date first wall have been carried out to revise the measurement requirements for the lost alpha monitor in ITER. In agreement with recent observations, the simulations presented here suggest that a pitch-angle resolution of ∼5° might be necessary to identify the loss mechanisms. Synthetic measurements including realistic lost alpha-particle as well as neutron and gamma fluxes predict scintillator signal-to-noise levels measurable with standard light acquisition systems with the detector aperture at ∼11 cm outside of the diagnostic first wall...
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27910497/analysis-techniques-for-diagnosing-runaway-ion-distributions-in-the-reversed-field-pinch
#7
J Kim, J K Anderson, W Capecchi, P J Bonofiglo, S H Sears
An advanced neutral particle analyzer (ANPA) on the Madison Symmetric Torus measures deuterium ions of energy ranges 8-45 keV with an energy resolution of 2-4 keV and time resolution of 10 μs. Three different experimental configurations measure distinct portions of the naturally occurring fast ion distributions: fast ions moving parallel, anti-parallel, or perpendicular to the plasma current. On a radial-facing port, fast ions moving perpendicular to the current have the necessary pitch to be measured by the ANPA...
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27910492/development-towards-a-fast-ion-loss-detector-for-the-reversed-field-pinch
#8
P J Bonofiglo, J K Anderson, A F Almagri, J Kim, J Clark, W Capecchi, S H Sears, J Egedal
A fast ion loss detector has been constructed and implemented on the Madison Symmetric Torus (MST) to investigate energetic ion losses and transport due to energetic particle and MHD instabilities. The detector discriminates particle orbits solely on pitch and consists of two thin-foil, particle collecting plates that are symmetric with respect to the device aperture. One plate collects fast ion signal, while the second aids in the minimization of background and noise effects. Initial measurements are reported along with suggestions for the next design phase of the detector...
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27910470/stokes-doppler-coherence-imaging-for-iter-boundary-tomography
#9
J Howard, M Kocan, S Lisgo, R Reichle
An optical coherence imaging system is presently being designed for impurity transport studies and other applications on ITER. The wide variation in magnetic field strength and pitch angle (assumed known) across the field of view generates additional Zeeman-polarization-weighting information that can improve the reliability of tomographic reconstructions. Because background reflected light will be somewhat depolarized analysis of only the polarized fraction may be enough to provide a level of background suppression...
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27910342/modifications-to-the-synthetic-aperture-microwave-imaging-diagnostic
#10
K J Brunner, J C Chorley, N A Dipper, G Naylor, R M Sharples, G Taylor, D A Thomas, R G L Vann
The synthetic aperture microwave imaging diagnostic has been operating on the MAST experiment since 2011. It has provided the first 2D images of B-X-O mode conversion windows and showed the feasibility of conducting 2D Doppler back-scattering experiments. The diagnostic heavily relies on field programmable gate arrays to conduct its work. Recent successes and newly gained experience with the diagnostic have led us to modify it. The enhancements will enable pitch angle profile measurements, O and X mode separation, and the continuous acquisition of 2D DBS data...
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27910330/scintillator-based-fast-ion-loss-measurements-in-the-east
#11
J F Chang, M Isobe, K Ogawa, J Huang, C R Wu, Z Xu, Z Jin, S Y Lin, L Q Hu
A new scintillator-based fast ion loss detector (FILD) has been installed on Experimental Advanced Superconducting Tokamak (EAST) to investigate the fast ion loss behavior in high performance plasma with neutral beam injection (NBI) and ion cyclotron resonance heating (ICRH). A two dimensional 40 mm × 40 mm scintillator-coated (ZnS:Ag) stainless plate is mounted in the front of the detector, capturing the escaping fast ions. Photons from the scintillator plate are imaged with a Phantom V2010 CCD camera. The lost fast ions can be measured with the pitch angle from 60° to 120° and the gyroradius from 10 mm to 180 mm...
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27910319/initial-operation-of-a-newly-developed-multichord-motional-stark-effect-diagnostic-in-kstar
#12
J Chung, J Ko, H Wi, M Messmer, S Schenkelaars, M Scheffer, R J E Jaspers
A photo-elastic modulator based 25-chord motional Stark effect (MSE) diagnostic has been successfully developed and commissioned in Korea Superconducting Tokamak Advanced Research. The diagnostic measures the radial magnetic pitch angle profile of the Stark splitting of a D-alpha line at 656.1 nm by the electric field associated with the neutral deuterium heating beam. A tangential view of the neutral beam provides a good spatial resolution of 1-3 cm for covering the major radius from 1.74 m to 2.28 m, and the time resolution is achieved at 10 ms...
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27910198/degradation-and-biocompatibility-of-photoembossed-plga-acrylate-blend-for-improved-cell-adhesion
#13
Nanayaa F Hughes-Brittain, Lin Qiu, Wen Wang, Ton Peijs, Cees W M Bastiaansen
We have shown previously that PMMA-acrylate photopolymers are biocomopatible and can exhibit improved cell adhesion compared to PMMA, due to an increase in negative surface charge caused by UV radiation PLGA has been used widely in soft tissue regeneration due to its high biocompatibility and cell adhesion. This polymer is also biodegradable and can be utilised in the field of vascular regeneration. In this study, PLGA is blended with a triacrylate monomer (TPETA) to create a degradable photopolymer blend. Surface relief structures are formed on this PLGA-TPETA by photoembossing...
December 2, 2016: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
https://www.readbyqxmd.com/read/27908157/volumetry-of-low-contrast-liver-lesions-with-ct-investigation-of-estimation-uncertainties-in-a-phantom-study
#14
Qin Li, Yongguang Liang, Qiao Huang, Min Zong, Benjamin Berman, Marios A Gavrielides, Lawrence H Schwartz, Binsheng Zhao, Nicholas Petrick
PURPOSE: To evaluate the performance of lesion volumetry in hepatic CT as a function of various imaging acquisition parameters. METHODS: An anthropomorphic abdominal phantom with removable liver inserts was designed for this study. Two liver inserts, each containing 19 synthetic lesions with varying diameter (6-40 mm), shape, contrast (10-65 HU), and both homogenous and mixed-density were designed to have background and lesion CT values corresponding to arterial and portal-venous phase imaging, respectively...
December 2016: Medical Physics
https://www.readbyqxmd.com/read/27908081/word-specific-effects-on-sound-change-of-the-lexical-pitch-accent-in-kyungsang-korean
#15
Hyunjung Lee
This study investigated word-specific effects for the on-going sound change of the lexical pitch accent of Kyungsang Korean, arguably induced by influence from the standard Seoul Korean. This study tested whether Kyungsang speakers produced and perceived words used only in Kyungsang areas differently from the words used both in Seoul and Kyungsang areas. In production and perception experiments, Kyungsang speakers exhibited more conservative patterns for the word used only in the Kyungsang area compared to the other type of words...
November 2016: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/27906286/modeling-and-experimental-study-of-plasmonic-lens-imaging-with-resolution-enhanced-methods
#16
Zeyu Zhao, Yunfei Luo, Na Yao, Wei Zhang, Changtao Wang, Ping Gao, Chengwei Zhao, Mingbo Pu, Xiangang Luo
Plasmonic lens imaging with some resolution enhancement methods are investigated in this paper, mainly by physical modeling and numerical simulations. The imaging model is based on the refined optical transfer function with extra reflection in imaging space and measured in variant magnetic and electric field components. The influences of structured light illumination and mask patterns<sup>'</sup> modifications are considered as well. As experimental demonstrations, L-shaped slits pattern with a half-pitch of 60 nm is successfully imaged with 50 nm air distance, by using plasmonic cavity lens lithography and off-axis illumination with 365 nm wavelength light...
November 28, 2016: Optics Express
https://www.readbyqxmd.com/read/27905321/tailoring-the-morphology-and-luminescence-of-gan-ingan-core-shell-nanowires-using-bottom-up-selective-area-epitaxy
#17
Mohsen Nami, Rhett F Eller, Serdal Okur, Ashwin K Rishinaramangalam, Sheng Liu, Igal Brener, Daniel F Feezell
Controlled bottom-up selective-area epitaxy (SAE) is used to tailor the morphology and photoluminescence properties of GaN/InGaN core-shell nanowire arrays. The nanowires are grown on c-plane sapphire substrates using pulsed-mode metal organic chemical vapor deposition. By varying the dielectric mask configuration and growth conditions, we achieve GaN nanowire cores with diameters ranging from 80 to 700 nm that exhibit various degrees of polar, semipolar, and nonpolar faceting. A single InGaN quantum well (QW) and GaN barrier shell is also grown on the GaN nanowire cores and micro-photoluminescence is obtained and analyzed for a variety of nanowire dimensions, array pitch spacings, and aperture diameters...
December 1, 2016: Nanotechnology
https://www.readbyqxmd.com/read/27904696/a-study-on-the-correlation-between-mthfr-promoter-methylation-and-diabetic-nephropathy
#18
Xiao-Hui Yang, Ren-Fang Cao, Yang Yu, Miao Sui, Tao Zhang, Jing-Yi Xu, Xiao-Mei Wang
OBJECTIVE: In order to observe the relationship between MTHFR promoter and DN, the determinations on MTHFR promoter methylation level and expression of HCY from DN patients have been carried out. METHODS: According to the Diabetes diagnosis and classification standard from WHO in 1999, 85 patients with DM diagnosed by Endocrinology and 30 healthy participants from our medical examination center were chosen as control specimen to study in this paper. All this specimen were divided into A, B, C and D four groups , which are corresponding simple diabetes mellitus group (SDM), early diabetic nephropathy group (EDN), clinical diabetic nephropathy group (CDN) and normal control group...
2016: American Journal of Translational Research
https://www.readbyqxmd.com/read/27903764/epilepsy-and-music-practical-notes
#19
REVIEW
M Maguire
Music processing occurs via a complex network of activity far beyond the auditory cortices. This network may become sensitised to music or may be recruited as part of a temporal lobe seizure, manifesting as either musicogenic epilepsy or ictal musical phenomena. The idea that sound waves may directly affect brain waves has led researchers to explore music as therapy for epilepsy. There is limited and low quality evidence of an antiepileptic effect with the Mozart Sonata K.448. We do not have a pathophysiological explanation for the apparent dichotomous effect of music on seizures...
November 30, 2016: Practical Neurology
https://www.readbyqxmd.com/read/27903163/ultrasound-imaging-of-ulnar-collateral-ligament-injury
#20
Arie J van Duijn, Shawn D Felton
The patient was an 18-year-old collegiate baseball pitcher who injured his right throwing elbow during an overhead slider pitch. As a part of a study, preinjury ultrasound images of the throwing arm were obtained 2 weeks prior to the injury. One day postinjury, repeat ultrasound imaging of the medial elbow was performed. The attending team physician ordered a magnetic resonance arthrogram 2 days after injury, which confirmed the presence of a complete tear of the ulnar collateral ligament. J Orthop Sports Phys Ther 2016;46(12):1086...
December 2016: Journal of Orthopaedic and Sports Physical Therapy
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