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  • Articles  (3,042,650)
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  • Electrical Engineering, Measurement and Control Technology  (574,657)
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  • 11
    Electronic Resource
    Electronic Resource
    Bakeable duoplasmatron ion gun for SIMS microanalysis : Proceedings of the fourth International Conference on Ion Sources (1992)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 63 (1992), S. 2397-2399 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A 10-keV duoplasmatron ion gun with ion optical column is presented. The system is fully bakeable; copper gaskets and alumina isolators are used. The source can operate with hot filament or hollow cathode. The differentially pumped ion optical column consists of a set of three lenses, double octupole stigmator, deflection-scanning system, and diaphragm set.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1142941
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  • 12
    Electronic Resource
    Electronic Resource
    Performance investigation of a focused ion beam for sputter deposition : Proceedings of the fourth International Conference on Ion Sources (1992)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 63 (1992), S. 2400-2402 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Recently, focused ion beam sources have been widely used in various film deposition. This paper introduces the performance investigation of a focused ion beam source for sputter deposition. A 3.5-cm-diam ion source was used in the experiments. The results of the tests show that (1) at given ion beam energy there is an optimum value of ion beam current which gives the maximum value of ion beam current density; (2) at higher beam energy the peak of ion beam current density is higher and is obtained at larger beam current; (3) the ion beam current density increases with increasing magnetic flux density but there is an optimum value of magnetic flux density, and (4) the ion beam current density increases with increasing discharge voltage and gas flow rate, decreases with increasing accelerator voltage. Finally, these results are analyzed and discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1142942
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  • 13
    Electronic Resource
    Electronic Resource
    The formation of coatings from ionized vapor : Proceecings of the fourth International Conference on Ion Sources (1992)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 63 (1992), S. 2406-2407 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The structure and properties of metallic coatings from ionized vapor are investigated. A method of evaporating materials in vacuum by means of a non-self-maintained discharge was developed. The evaporator, consisting of a heated cathode, focusing elements, and anode (the material to be evaporated), generates an atom flux variable from 1016 to 5×1017 cm−2 s−1 and fractional ionization from 2% to 100%. The properties of the non-self-maintained discharge have been investigated over the voltage range from 30 to 700 V and current range from 1 to 50 A. The ionization of the vapor flux and control over the energy provide a deposit of strongly adhering coatings with small crystalline structure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1142944
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  • 14
    Electronic Resource
    Electronic Resource
    Characteristics of an ECR ion beam source for low-pressure etching : Proceedings of the fourth International Conference on Ion Sources (1992)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 63 (1992), S. 2403-2405 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We have investigated an ECR ion beam source operated with a pair of coils and a two-grid extraction optics. The most important parameter for the source operation at low pressure (p〈10−3 mbar) is the magnetic field in the source. A basic understanding of the physics occurring in this source can be obtained by simply registrating the total ion beam current through the first grid as a function of the magnetic field from the coils. From these characteristics we find that for the wave-propagation through the plasma column the magnet next to the microwave feed (rear magnet) is the important one. The other one (front magnet) controls the electron losses if the plasma generation is mainly located in the rear magnet. For certain magnetic field distributions we find harmonics of the ECR resonance, indicating nonlinear plasma wave interactions occurring in the source.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1142943
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  • 15
    Electronic Resource
    Electronic Resource
    A field portable scanner for analysis of thin layer chromatography plates based on multiwavelength image processing (1992)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 63 (1992), S. 4333-4341 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A field portable, multiwavelength, digital image processing system for the analysis of thin layer chromatography plates is described. The imaging module consists of a two-dimensional charge coupled device detector, a xenon strobe light source, a stepper driven filter wheel for wavelength selection, and hardware to digitize images. The instrument is controlled by a laptop computer resulting in a compact device the size of a 6-in. thick briefcase. As a representative application, software has been developed for the automated analysis of sulfa residues in pork products by thin layer chromatography (USDA SOS-test). Response to analyte concentration is linear over two and one half orders of magnitude with a correlation coefficient of 0.9998. Detection limit is 80 pg for sulfamethazine spotted on a plate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1143733
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  • 16
    Electronic Resource
    Electronic Resource
    A high-energy spherical grating monochromator for soft x rays at the Daresbury SRS (1992)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 63 (1992), S. 4349-4353 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A vertically dispersing high-energy spherical grating monochromator (HESGM) has been installed on the synchrotron radiation source (SRS) at the Daresbury Laboratory. The instrument has no entrance slit and provides a high intensity source of x rays of energy 250–1400 eV focused into a small spot suitable for surface spectroscopy. Photoabsorption features of 240 meV have been resolved, but the resolution of the instrument is dependent on the SRS stored beam current. The degree of linear polarization has been measured at the carbon K edge to be 0.80.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1143735
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  • 17
    Electronic Resource
    Electronic Resource
    Thermal property measurements of liquid samples using photoacoustic detection (1992)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 63 (1992), S. 4398-4402 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: In this paper we describe the use of so-called open-photoacoustic cell (OPC) for thermal characterization of transparent liquid samples. The samples used to demonstrate the usefulness of the OPC configuration are water, glycerol, and diffusion pump oil.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1143740
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  • 18
    Electronic Resource
    Electronic Resource
    The Frascati Tokamak Upgrade Thomson scattering system: The optical and spectral analysis equipments (1992)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 63 (1992), S. 4403-4409 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: An overall view of the Frascati Tokamak Upgrade (F.T.U.) Thomson scattering system is illustrated and particular attention is paid to the optical and spectral analysis equipments. The system includes the laser source, the collection optics, a set of filter polychromators, all the electronic equipments necessary to collect the data relevant to the scattered light and to send them to the F.T.U. data acquisition system. The features of this system can be summarized as follows: rejection to laser wavelength: ≥107, laser energy: ≥5 J, overall optical efficiency: ≥40%, and capability of multiple time and space measurements on the Thomson scattered light.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1143741
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  • 19
    Electronic Resource
    Electronic Resource
    Relativistic detuning limit on energy in electron cyclotron resonance x-ray source (1992)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 63 (1992), S. 4439-4442 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: In this paper, a detailed theoretical analysis of electron acceleration in a TE111 cylindrical resonant cavity used as a cyclotron resonance accelerator is presented. The relativistic detuning limit on energy is found to depend critically on the externally applied dc magnetic field. The optimum value of the magnetic field, for a given operating frequency, electric field, and the cavity dimensions, is calculated. The cavity dimensions are optimized to get maximum peak-to-peak electric field so that higher electron energy can be obtained. It is also shown that most of the electrons, depending on the time of emission, end up in two accelerating bunches.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1143693
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  • 20
    Electronic Resource
    Electronic Resource
    Fast curve fitting using neural networks (1992)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 63 (1992), S. 4450-4456 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Neural networks provide a new tool for the fast solution of repetitive nonlinear curve fitting problems. In this article we introduce the concept of a neural network, and we show how such networks can be used for fitting functional forms to experimental data. The neural network algorithm is typically much faster than conventional iterative approaches. In addition, further substantial improvements in speed can be obtained by using special purpose hardware implementations of the network, thus making the technique suitable for use in fast real-time applications. The basic concepts are illustrated using a simple example from fusion research, involving the determination of spectral line parameters from measurements of B iv impurity radiation in the COMPASS-C tokamak.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1143696
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