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  • 1
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    Preliminary consideration of CFETR ITER-like case diagnostic system (2016)
    American Institute of Physics (AIP)
    Details
    Publication Date: 2016-07-12
    Description: Chinese Fusion Engineering Test Reactor (CFETR) is a new superconducting tokamak device being designed in China, which aims at bridging the gap between ITER and DEMO, where DEMO is a tokamak demonstration fusion reactor. Two diagnostic cases, ITER-like case and towards DEMO case, have been considered for CFETR early and later operating phases, respectively. In this paper, some preliminary consideration of ITER-like case will be presented. Based on ITER diagnostic system, three versions of increased complexity and coverage of the ITER-like case diagnostic system have been developed with different goals and functions. Version A aims only machine protection and basic control. Both of version B and version C are mainly for machine protection, basic and advanced control, but version C has an increased level of redundancy necessary for improved measurements capability. The performance of these versions and needed R&D work are outlined.
    Print ISSN: 0034-6748
    Electronic ISSN: 1089-7623
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Published by American Institute of Physics (AIP)
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  • 2
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    A novel approach to correct the coded aperture misalignment for fast neutron imaging (2016)
    American Institute of Physics (AIP)
    Details
    Publication Date: 2016-01-01
    Description: Aperture alignment is crucial for the diagnosis of neutron imaging because it has significant impact on the coding imaging and the understanding of the neutron source. In our previous studies on the neutron imaging system with coded aperture for large field of view, “residual watermark,” certain extra information that overlies reconstructed image and has nothing to do with the source is discovered if the peak normalization is employed in genetic algorithms (GA) to reconstruct the source image. Some studies on basic properties of residual watermark indicate that the residual watermark can characterize coded aperture and can thus be used to determine the location of coded aperture relative to the system axis. In this paper, we have further analyzed the essential conditions for the existence of residual watermark and the requirements of the reconstruction algorithm for the emergence of residual watermark. A gamma coded imaging experiment has been performed to verify the existence of residual watermark. Based on the residual watermark, a correction method for the aperture misalignment has been studied. A multiple linear regression model of the position of coded aperture axis, the position of residual watermark center, and the gray barycenter of neutron source with twenty training samples has been set up. Using the regression model and verification samples, we have found the position of the coded aperture axis relative to the system axis with an accuracy of approximately 20 μ m. Conclusively, a novel approach has been established to correct the coded aperture misalignment for fast neutron coded imaging.
    Print ISSN: 0034-6748
    Electronic ISSN: 1089-7623
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Published by American Institute of Physics (AIP)
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  • 3
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    Control of excitons in multi-layer van der Waals heterostructures (2016)
    American Institute of Physics (AIP)
    Details
    Publication Date: 2016-03-08
    Description: We report an experimental study of excitons in a double quantum well van der Waals heterostructure made of atomically thin layers of MoS 2 and hexagonal boron nitride. The emission of neutral and charged excitons is controlled by gate voltage, temperature, and both the helicity and the power of optical excitation.
    Print ISSN: 0003-6951
    Electronic ISSN: 1077-3118
    Topics: Physics
    Published by American Institute of Physics (AIP)
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  • 4
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    A flowing liquid lithium limiter for the Experimental Advanced Superconducting Tokamak (2015)
    American Institute of Physics (AIP)
    Details
    Publication Date: 2015-02-12
    Description: A program involving the extensive and systematic use of lithium (Li) as a “first,” or plasma-facing, surface in Tokamak fusion research devices located at Institute of Plasma Physics, Chinese Academy of Sciences, was started in 2009. Many remarkable results have been obtained by the application of Li coatings in Experimental Advanced Superconducting Tokamak (EAST) and liquid Li limiters in the HT-7 Tokamak—both located at the institute. In furtherance of the lithium program, a flowing liquid lithium (FLiLi) limiter system has been designed and manufactured for EAST. The design of the FLiLi limiter is based on the concept of a thin flowing film which was previously tested in HT-7. Exploiting the capabilities of the existing material and plasma evaluation system on EAST, the limiter will be pre-wetted with Li and mechanically translated to the edge of EAST during plasma discharges. The limiter will employ a novel electro-magnetic pump which is designed to drive liquid Li flow from a collector at the bottom of limiter into a distributor at its top, and thus supply a continuously flowing liquid Li film to the wetted plasma-facing surface. This paper focuses on the major design elements of the FLiLi limiter. In addition, a simulation of incoming heat flux has shown that the distribution of heat flux on the limiter surface is acceptable for a future test of power extraction on EAST.
    Print ISSN: 0034-6748
    Electronic ISSN: 1089-7623
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Published by American Institute of Physics (AIP)
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  • 5
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    Error analysis for ultra dense nanomagnet logic circuits (2015)
    American Institute of Physics (AIP)
    Details
    Publication Date: 2015-03-20
    Description: Dependency of errors in nanomagnet logic datalines on the dipole coupling strength is investigated. Evolution of different types of errors at different coupling strengths is studied. Dipole coupling strength in datalines is varied by changing the inter-magnet spacing from 30 nm to 10 nm and the aspect ratios of the 20-nm-thick Supermalloy (Ni 79 Fe 16 Mo 5 ) dots from 90 × 60 nm 2 to 120 × 60 nm 2 . An error rate improvement up to 46% is observed for inter-magnet space reduction from 30 nm to 10 nm. Error rates in datalines with larger spacing are dominated by premature switching, whereas a new type of error, due to the stronger influence of the driver magnets, dominates in datalines with tighter (sub-20-nm) spacing. For same spacing, datalines with lower aspect ratio magnets show higher error rates compared to those with higher aspect ratio.
    Print ISSN: 0021-8979
    Electronic ISSN: 1089-7550
    Topics: Physics
    Published by American Institute of Physics (AIP)
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  • 6
    Electronic Resource
    Electronic Resource
    Stress-related problems in silicon technology (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 53 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The silicon integrated-circuits chip is built by contiguously embedding, butting, and overlaying structural elements of a large variety of materials of different elastic and thermal properties. Stress develops in the thermal cycling of the chip. Furthermore, many structural elements such as CVD (chemical vapor deposition) silicon nitride, silicon dioxide, polycrystalline silicon, etc., by virtue of their formation processes, exhibit intrinsic stresses. Large localized stresses are induced in the silicon substrate near the edges and corners of such structural elements. Oxidation of nonplanar silicon surfaces produces another kind of stress that can be very damaging, especially at low oxidation temperatures. Mismatch of atomic sizes between dopants and the silicon, and heteroepitaxy produce another class of strain that can lead to the formation of misfit dislocations. Here we review the achievements to date in understanding and modeling these diverse stress problems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.349282
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  • 7
    Electronic Resource
    Electronic Resource
    Misfit dislocations and critical thickness of heteroepitaxy (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 7901-7903 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An expression is derived for the critical thickness of heteroepitaxial films by taking the energy minimization approach. It is exactly identical to the critical thickness obtained by Matthew and Blakeslee [J. Cryst. Growth 27, 118 (1974)] using a force balance approach, after allowing for a discrepancy judged to be an unmentioned approximation in the latter. The equivalence of the two formulations is explained conceptually. The reason is pointed out for the very different critical thickness obtained by People and Bean [Appl. Phys. Lett. 47, 322 (1985); 49, 229 (1986)] using the energy minimization approach. It is further shown that misfit dislocations do not appear en masse catastrophically when the critical thickness is reached. Rather, their density increases gradually with the epitaxial thickness, approaching only asymptotically a value required for a complete relief of film stress as the thickness tends to infinity. Any observed sudden mass appearance of misfit dislocations must be attributed to a substantial supercritical thickness actually existing, prior to nucleation of dislocations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.347476
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  • 8
    Electronic Resource
    Electronic Resource
    Erratum: Misfit dislocations and critical thickness of heteroepitaxy [J. Appl. Phys. 69, 7901 (1991)] (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 4009-4009 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.349174
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  • 9
    Electronic Resource
    Electronic Resource
    Low-threshold InGaAs/GaAs strained layer single quantum well lasers with simple ridge waveguide structure (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 7892-7894 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Double heterostructure InGaAs-GaAs strained-layer single quantum well ridge waveguide lasers grown by molecular beam epitaxy were fabricated by using in situ laser monitored reactive ion etching to form the ridges. Continuous-wave threshold current as low as 3.5 mA was obtained on a ridge laser diode of 3.3 μm wide and 215 μm long having cleaved mirrors. The lasing wavelength is at 0.988 μm and the measured differential external quantum efficiency is 61%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.347473
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  • 10
    Electronic Resource
    Electronic Resource
    The expansion of product probability distributions from trajectory calculations in two-dimensional Fourier series (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 89 (1988), S. 1958-1965 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The procedure for expanding product probability density functions determined from a classical trajectory study in a two-dimensional Fourier series is developed. This method has the advantage that essentially all of the information obtained from the trajectories is retained in the expansion; consequently, the resolution of the density functions is high. A smoothing technique using a Gaussian filter is also presented. The results are applied to a quasiclassical study of the F+H2 reaction, and new insights are obtained for this reaction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.455094
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