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https://www.readbyqxmd.com/read/27911426/-ocular-hydrodynamics-after-phacoemulsification-cataract-surgery-in-patients-with-primary-open-angle-glaucoma
#1
E A Kalizhnikova, O I Lebedev, O V Shchipacheva, G G Pecheritsa
AIM: To investigate parameters of intraocular fluid outflow after phacoemulsification of cataract in patients with primary open-angle glaucoma (POAG). MATERIAL AND METHODS: The study involved 153 cataract patients (153 eyes), most of whom also had POAG. The patients were divided into three groups: group 1 - 51 patients (51 eyes) with cataract but no glaucoma, group 2 - 51 patients (51 eyes) with cataract and early POAG, and group 3 - 51 patients (51 eyes) with cataract and advanced POAG...
2016: Vestnik Oftalmologii
https://www.readbyqxmd.com/read/27911042/orderly-layered-zr-benzylphosphonate-nanohybrids-for-efficient-acid-base-mediated-bifunctional-cascade-catalysis
#2
Hu Li, Zhen Fang, Jian He, Song Yang
The development of functional metal-organic materials being robust and active for bifunctional/cascade catalysis is of great significance. Herein, a series of mesoporous and orderly layered nanohybrids were synthesized for the first time via simple and template-free assembly of ortho-, meta-, or para-xylylenediphosphonates (o-, p-, or m-PhP) with zirconium. It was found that m-PhPZr nanoparticles (20-50 nm) with mesopores centered at 7.9 nm and high Lewis acid/base site ratio (1:0.7) showed prominent performance under mild conditions (as low as 82 ºC) in transfer hydrogenation of carbonyl compounds including bio-aldehydes to alcohols with near quantative yields and little Zr leaching...
December 2, 2016: ChemSusChem
https://www.readbyqxmd.com/read/27910673/implementation-of-the-new-multichannel-x-mode-edge-density-profile-reflectometer-for-the-icrf-antenna-on-asdex-upgrade
#3
D E Aguiam, A Silva, V Bobkov, P J Carvalho, P F Carvalho, R Cavazzana, G D Conway, O D'Arcangelo, L Fattorini, H Faugel, A Fernandes, H Fünfgelder, B Gonçalves, L Guimarais, G De Masi, L Meneses, J M Noterdaeme, R C Pereira, G Rocchi, J M Santos, A A Tuccillo, O Tudisco
A new multichannel frequency modulated continuous-wave reflectometry diagnostic has been successfully installed and commissioned on ASDEX Upgrade to measure the plasma edge electron density profile evolution in front of the Ion Cyclotron Range of Frequencies (ICRF) antenna. The design of the new three-strap ICRF antenna integrates ten pairs (sending and receiving) of microwave reflectometry antennas. The multichannel reflectometer can use three of these to measure the edge electron density profiles up to 2 × 10(19) m(-3), at different poloidal locations, allowing the direct study of the local plasma layers in front of the ICRF antenna...
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27910670/alignment-and-absolute-wavelength-calibration-of-imaging-bragg-spectrometers
#4
G Bertschinger, O Marchuk, R Barnsley
In the present and the next generation of fusion devices, imaging Bragg spectrometers are key diagnostics to measure plasma parameters in the hot core, especially ion temperature and plasma rotation. The latter quantities are routinely obtained using the Doppler-width and -shift of the emitted spectral lines, respectively. Line shift measurements require absolute accuracies Δλ/λ of about 10 ppm, where λ-is the observed wavelength. For ITER and the present fusion devices, spectral lines of He-and H-like argon, iron, and krypton as well as Ne-like tungsten are foreseen for the measurements...
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27910656/the-design-of-the-optical-thomson-scattering-diagnostic-for-the-national-ignition-facility
#5
P S Datte, J S Ross, D H Froula, K D Daub, J Galbraith, S Glenzer, B Hatch, J Katz, J Kilkenny, O Landen, D Manha, A M Manuel, W Molander, D Montgomery, J Moody, G F Swadling, J Weaver
The National Ignition Facility (NIF) is a 192 laser beam facility designed to support the Stockpile Stewardship, High Energy Density and Inertial Confinement Fusion (ICF) programs. We report on the design of an Optical Thomson Scattering (OTS) diagnostic that has the potential to transform the community's understanding of NIF hohlraum physics by providing first principle, local, time-resolved measurements of under-dense plasma conditions. The system design allows operation with different probe laser wavelengths by manual selection of the appropriate beam splitter and gratings before the shot...
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27910648/simulated-performance-of-the-optical-thomson-scattering-diagnostic-designed-for-the-national-ignition-facility
#6
J S Ross, P Datte, L Divol, J Galbraith, D H Froula, S H Glenzer, B Hatch, J Katz, J Kilkenny, O Landen, A M Manuel, W Molander, D S Montgomery, J D Moody, G Swadling, J Weaver
An optical Thomson scattering diagnostic has been designed for the National Ignition Facility to characterize under-dense plasmas. We report on the design of the system and the expected performance for different target configurations. The diagnostic is designed to spatially and temporally resolve the Thomson scattered light from laser driven targets. The diagnostic will collect scattered light from a 50 × 50 × 200 μm volume. The optical design allows operation with different probe laser wavelengths. A deep-UV probe beam (λ0 = 210 nm) will be used to Thomson scatter from electron plasma densities of ∼5 × 10(20) cm(-3) while a 3ω probe will be used for plasma densities of ∼1 × 10(19) cm(-3)...
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27910599/synthetic-plasma-edge-diagnostics-for-emc3-eirene-highlighted-for-wendelstein-7-x
#7
H Frerichs, F Effenberg, O Schmitz, C Biedermann, Y Feng, M Jakubowski, R König, M Krychowiak, J Lore, H Niemann, T S Pedersen, L Stephey, G A Wurden
Interpretation of spectroscopic measurements in the edge region of high-temperature plasmas can be a challenge since line of sight integration effects make direct interpretation in terms of quantitative, local emission strengths often impossible. The EMC3-EIRENE code-a 3D fluid edge plasma and kinetic neutral gas transport code-is a suitable tool for full 3D reconstruction of such signals. A versatile synthetic diagnostic module has been developed recently which allows the realistic 3D setup of various plasma edge diagnostics to be captured...
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27910592/structured-photocathodes-for-improved-high-energy-x-ray-efficiency-in-streak-cameras
#8
Y P Opachich, P M Bell, D K Bradley, N Chen, J Feng, A Gopal, B Hatch, T J Hilsabeck, E Huffman, J A Koch, O L Landen, A G MacPhee, S R Nagel, S Udin
We have designed and fabricated a structured streak camera photocathode to provide enhanced efficiency for high energy X-rays (1-12 keV). This gold coated photocathode was tested in a streak camera and compared side by side against a conventional flat thin film photocathode. Results show that the measured electron yield enhancement at energies ranging from 1 to 10 keV scales well with predictions, and that the total enhancement can be more than 3×. The spatial resolution of the streak camera does not show degradation in the structured region...
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27910557/a-storage-ring-experiment-to-detect-a-proton-electric-dipole-moment
#9
V Anastassopoulos, S Andrianov, R Baartman, S Baessler, M Bai, J Benante, M Berz, M Blaskiewicz, T Bowcock, K Brown, B Casey, M Conte, J D Crnkovic, N D'Imperio, G Fanourakis, A Fedotov, P Fierlinger, W Fischer, M O Gaisser, Y Giomataris, M Grosse-Perdekamp, G Guidoboni, S Hacıömeroğlu, G Hoffstaetter, H Huang, M Incagli, A Ivanov, D Kawall, Y I Kim, B King, I A Koop, D M Lazarus, V Lebedev, M J Lee, S Lee, Y H Lee, A Lehrach, P Lenisa, P Levi Sandri, A U Luccio, A Lyapin, W MacKay, R Maier, K Makino, N Malitsky, W J Marciano, W Meng, F Meot, E M Metodiev, L Miceli, D Moricciani, W M Morse, S Nagaitsev, S K Nayak, Y F Orlov, C S Ozben, S T Park, A Pesce, E Petrakou, P Pile, B Podobedov, V Polychronakos, J Pretz, V Ptitsyn, E Ramberg, D Raparia, F Rathmann, S Rescia, T Roser, H Kamal Sayed, Y K Semertzidis, Y Senichev, A Sidorin, A Silenko, N Simos, A Stahl, E J Stephenson, H Ströher, M J Syphers, J Talman, R M Talman, V Tishchenko, C Touramanis, N Tsoupas, G Venanzoni, K Vetter, S Vlassis, E Won, G Zavattini, A Zelenski, K Zioutas
A new experiment is described to detect a permanent electric dipole moment of the proton with a sensitivity of 10(-29) e ⋅ cm by using polarized "magic" momentum 0.7 GeV/c protons in an all-electric storage ring. Systematic errors relevant to the experiment are discussed and techniques to address them are presented. The measurement is sensitive to new physics beyond the standard model at the scale of 3000 TeV.
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27910532/improving-the-off-axis-spatial-resolution-and-dynamic-range-of-the-nif-x-ray-streak-cameras-invited
#10
A G MacPhee, A K L Dymoke-Bradshaw, J D Hares, J Hassett, B W Hatch, A L Meadowcroft, P M Bell, D K Bradley, P S Datte, O L Landen, N E Palmer, K W Piston, V V Rekow, T J Hilsabeck, J D Kilkenny
We report simulations and experiments that demonstrate an increase in spatial resolution of the NIF core diagnostic x-ray streak cameras by at least a factor of two, especially off axis. A design was achieved by using a corrector electron optic to flatten the field curvature at the detector plane and corroborated by measurement. In addition, particle in cell simulations were performed to identify the regions in the streak camera that contribute the most to space charge blurring. These simulations provide a tool for convolving synthetic pre-shot spectra with the instrument function so signal levels can be set to maximize dynamic range for the relevant part of the streak record...
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27910522/design-and-characterization-of-a-linear-hencken-type-burner
#11
M F Campbell, G A Bohlin, P E Schrader, R P Bambha, C J Kliewer, K O Johansson, H A Michelsen
We have designed and constructed a Hencken-type burner that produces a 38-mm-long linear laminar partially premixed co-flow diffusion flame. This burner was designed to produce a linear flame for studies of soot chemistry, combining the benefit of the conventional Hencken burner's laminar flames with the advantage of the slot burner's geometry for optical measurements requiring a long interaction distance. It is suitable for measurements using optical imaging diagnostics, line-of-sight optical techniques, or off-axis optical-scattering methods requiring either a long or short path length through the flame...
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27910520/publisher-s-note-structured-photocathodes-for-improved-high-energy-x-ray-efficiency-in-streak-cameras-rev-sci-instrum-87-11e331-2016
#12
Y P Opachich, P M Bell, D K Bradley, N Chen, J Feng, A Gopal, B Hatch, T J Hilsabeck, E Huffman, J A Koch, O L Landen, A G MacPhee, S R Nagel, S Udin
No abstract text is available yet for this article.
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27910489/resolving-hot-spot-microstructure-using-x-ray-penumbral-imaging-invited
#13
B Bachmann, T Hilsabeck, J Field, N Masters, C Reed, T Pardini, J R Rygg, N Alexander, L R Benedetti, T Döppner, A Forsman, N Izumi, S LePape, T Ma, A G MacPhee, S Nagel, P Patel, B Spears, O L Landen
We have developed and fielded x-ray penumbral imaging on the National Ignition Facility in order to enable sub-10 μm resolution imaging of stagnated plasma cores (hot spots) of spherically shock compressed spheres and shell implosion targets. By utilizing circular tungsten and tantalum apertures with diameters ranging from 20 μm to 2 mm, in combination with image plate and gated x-ray detectors as well as imaging magnifications ranging from 4 to 64, we have demonstrated high-resolution imaging of hot spot plasmas at x-ray energies above 5 keV...
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27910437/design-calculations-for-a-xenon-plasma-x-ray-shield-to-protect-the-nif-optical-thomson-scattering-diagnostic
#14
G F Swadling, J S Ross, P Datte, J Moody, L Divol, O Jones, O Landen
An Optical Thomson Scattering (OTS) diagnostic is currently being developed for the National Ignition Facility (NIF) at Lawrence Livermore National Laboratory. This diagnostic is designed to make measurements of the hohlraum plasma parameters, such as the electron temperature and the density, during inertial confinement fusion (ICF) experiments. NIF ICF experiments present a very challenging environment for optical measurements; by their very nature, hohlraums produce intense soft x-ray emission, which can cause "blanking" (radiation induced opacity) of the radiation facing optical components...
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27910418/observation-of-hohlraum-wall-motion-with-spectrally-selective-x-ray-imaging-at-the-national-ignition-facility
#15
N Izumi, N B Meezan, L Divol, G N Hall, M A Barrios, O Jones, O L Landen, J J Kroll, S A Vonhof, A Nikroo, J Jaquez, C G Bailey, C M Hardy, R B Ehrlich, R P J Town, D K Bradley, D E Hinkel, J D Moody
The high fuel capsule compression required for indirect drive inertial confinement fusion requires careful control of the X-ray drive symmetry throughout the laser pulse. When the outer cone beams strike the hohlraum wall, the plasma ablated off the hohlraum wall expands into the hohlraum and can alter both the outer and inner cone beam propagations and hence the X-ray drive symmetry especially at the final stage of the drive pulse. To quantitatively understand the wall motion, we developed a new experimental technique which visualizes the expansion and stagnation of the hohlraum wall plasma...
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27910389/overview-of-diagnostic-performance-and-results-for-the-first-operation-phase-in-wendelstein-7-x-invited
#16
M Krychowiak, A Adnan, A Alonso, T Andreeva, J Baldzuhn, T Barbui, M Beurskens, W Biel, C Biedermann, B D Blackwell, H S Bosch, S Bozhenkov, R Brakel, T Bräuer, B Brotas de Carvalho, R Burhenn, B Buttenschön, A Cappa, G Cseh, A Czarnecka, A Dinklage, P Drews, A Dzikowicka, F Effenberg, M Endler, V Erckmann, T Estrada, O Ford, T Fornal, H Frerichs, G Fuchert, J Geiger, O Grulke, J H Harris, H J Hartfuß, D Hartmann, D Hathiramani, M Hirsch, U Höfel, S Jabłoński, M W Jakubowski, J Kaczmarczyk, T Klinger, S Klose, J Knauer, G Kocsis, R König, P Kornejew, A Krämer-Flecken, N Krawczyk, T Kremeyer, I Książek, M Kubkowska, A Langenberg, H P Laqua, M Laux, S Lazerson, Y Liang, S C Liu, A Lorenz, A O Marchuk, S Marsen, V Moncada, D Naujoks, H Neilson, O Neubauer, U Neuner, H Niemann, J W Oosterbeek, M Otte, N Pablant, E Pasch, T Sunn Pedersen, F Pisano, K Rahbarnia, L Ryć, O Schmitz, S Schmuck, W Schneider, T Schröder, H Schuhmacher, B Schweer, B Standley, T Stange, L Stephey, J Svensson, T Szabolics, T Szepesi, H Thomsen, J-M Travere, H Trimino Mora, H Tsuchiya, G M Weir, U Wenzel, A Werner, B Wiegel, T Windisch, R Wolf, G A Wurden, D Zhang, A Zimbal, S Zoletnik
Wendelstein 7-X, a superconducting optimized stellarator built in Greifswald/Germany, started its first plasmas with the last closed flux surface (LCFS) defined by 5 uncooled graphite limiters in December 2015. At the end of the 10 weeks long experimental campaign (OP1.1) more than 20 independent diagnostic systems were in operation, allowing detailed studies of many interesting plasma phenomena. For example, fast neutral gas manometers supported by video cameras (including one fast-frame camera with frame rates of tens of kHz) as well as visible cameras with different interference filters, with field of views covering all ten half-modules of the stellarator, discovered a MARFE-like radiation zone on the inboard side of machine module 4...
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27910388/fluence-compensated-down-scattered-neutron-imaging-using-the-neutron-imaging-system-at-the-national-ignition-facility
#17
D T Casey, P L Volegov, F E Merrill, D H Munro, G P Grim, O L Landen, B K Spears, D N Fittinghoff, J E Field, V A Smalyuk
The Neutron Imaging System at the National Ignition Facility is used to observe the primary ∼14 MeV neutrons from the hotspot and down-scattered neutrons (6-12 MeV) from the assembled shell. Due to the strong spatial dependence of the primary neutron fluence through the dense shell, the down-scattered image is convolved with the primary-neutron fluence much like a backlighter profile. Using a characteristic scattering angle assumption, we estimate the primary neutron fluence and compensate the down-scattered image, which reveals information about asymmetry that is otherwise difficult to extract without invoking complicated models...
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27910385/advances-in-the-ftu-collective-thomson-scattering-system
#18
W Bin, A Bruschi, O D'Arcangelo, G Grosso, L Lubiako, E Alessi, C Castaldo, C Centioli, M De Angeli, L Figini, C Galperti, S Garavaglia, G Granucci, M Lontano, S Magagnino, V Mellera, D Minelli, A Moro, A Muraro, A Nardone, F Orsitto, A Simonetto, U Tartari
The new collective Thomson scattering diagnostic installed on the Frascati Tokamak Upgrade device started its first operations in 2014. The ongoing experiments investigate the presence of signals synchronous with rotating tearing mode islands, possibly due to parametric decay processes, and phenomena affecting electron cyclotron beam absorption or scattering measurements. The radiometric system, diagnostic layout, and data acquisition system were improved accordingly. The present status and near-term developments of the diagnostic are presented...
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27910367/applications-of-doppler-free-saturation-spectroscopy-for-edge-physics-studies-invited
#19
E H Martin, A Zafar, J B O Caughman, R C Isler, G L Bell
Doppler-free saturation spectroscopy provides a very powerful method to obtain detailed information about the electronic structure of the atom through measurement of the spectral line profile. This is achieved through a significant decrease in the Doppler broadening and essentially an elimination of the instrument broadening inherent to passive spectroscopic techniques. In this paper we present the technique and associated physics of Doppler-free saturation spectroscopy in addition to how one selects the appropriate transition...
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27910364/spectroscopic-imaging-of-limiter-heat-and-particle-fluxes-and-the-resulting-impurity-sources-during-wendelstein-7-x-startup-plasmas
#20
L Stephey, G A Wurden, O Schmitz, H Frerichs, F Effenberg, C Biedermann, J Harris, R König, P Kornejew, M Krychowiak, E A Unterberg
A combined IR and visible camera system [G. A. Wurden et al., "A high resolution IR/visible imaging system for the W7-X limiter," Rev. Sci. Instrum. (these proceedings)] and a filterscope system [R. J. Colchin et al., Rev. Sci. Instrum. 74, 2068 (2003)] were implemented together to obtain spectroscopic data of limiter and first wall recycling and impurity sources during Wendelstein 7-X startup plasmas. Both systems together provided excellent temporal and spatial spectroscopic resolution of limiter 3. Narrowband interference filters in front of the camera yielded C-III and Hα photon flux, and the filterscope system provided Hα, Hβ, He-I, He-II, C-II, and visible bremsstrahlung data...
November 2016: Review of Scientific Instruments
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