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  • 1
    Electronic Resource
    Electronic Resource
    MINGL database system for TFTR (1988)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 59 (1988), S. 1768-1770 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The MINGL database system is an integrated set of tools which provides a means of collecting and managing diagnostic data and transport code results from TFTR. An interactive menu-driven format allows users to collect scalar and profile data from various data sources into shareable INGRES databases. LOCUS and INGRES/QUEL/SQL interfaces make it easy to browse, select, compare, and display the data in one of several formats. Utilities exist for managing the individual data sets and restricting their accessibility, for indexing the tables by author, and for maintaining a table of contents for an entire database. The modularity of the system allows automated database-server applications for between-shot analysis and display.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1140106
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  • 2
    Electronic Resource
    Electronic Resource
    LOCUS database system (1988)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 59 (1988), S. 1780-1782 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: LOCUS is a database system for creating, manipulating, and interactively investigating databases. LOCUS was written in response to the need to study the data from the experimental devices at the Princeton Plasma Physics Laboratory and is now also used extensively at other fusion laboratories. An example of its use is the determination of scaling laws for tokamak plasmas. To do this, LOCUS allows the user to enter and modify data, define subsidiary variables as arbitrary functions of original data, plot and fit such variables, and perform multiple linear regression analysis. Through a flexible interactive interface the program is easy to learn and largely self-documenting. There are two implementations of LOCUS: one that manipulates data in VAX/VMS ISAM files and another that manipulates data in the commercial relational database management system INGRES.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1140110
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  • 3
    Electronic Resource
    Electronic Resource
    PLT data acquisition and analysis system (1986)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 57 (1986), S. 1886-1888 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The data acquisition and analysis system for PLT (Princeton Large Torus) is being moved from a DEC-10 to a VAX 11/785. Most of the major diagnostics are currently running on the VAX, with approximately 1 Mbyte of data being taken each shot. The system uses the MIT model data system (MDS) for acquisition and archival of data and the PPPL event-controlled scheduler (ECS) for scheduling. The analysis programs use the MDS data retrieval subroutines which deliver correctly calibrated results to the user program.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1139161
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  • 4
    Electronic Resource
    Electronic Resource
    Preparing diagnostic data for the snap transport code : Proceedings of the 9th topical conference on high temperature plasma diagnostics (1992)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 63 (1992), S. 4750-4752 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: This paper describes the program snapin which is used to prepare data for transport analysis with the snap code. The data input to snap includes diagnostic profiles [ne(R), Te(R), Ti(R), vφ(R), Zeff(R), Prad(R)] and measurements such as total plasma current, Rmajor, beam power, gas puff rate, etc. snapin reads in the necessary TFTR data, allows editing of that data, including graphical editing of profile data and the selection of physics models. snapin allows comparison of profile data from all diagnostics that measure a quantity, for example, electron temperature profiles from Thomson scattering and electron cyclotron emission (ECE). A powerful user interface is important to help the user prepare input data sets quickly and consistently, because hundreds of variables must be specified for each analysis. snapin facilitates this by a careful organization of menus, display of all scalar data and switch settings within the menus, the graphical editing and comparison of profiles, and step-by-step checking for consistent physics controls [J. Murphy, S. Scott, and H. Towner, The snap User's Guide, Technical Report PPPL-TM-393, Princeton Plasma Physics Laboratory (1992)].
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1143629
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  • 5
    Electronic Resource
    Electronic Resource
    Data analysis on TFTR using the SNAP transport code : Proceedings of the 9th topical conference on high temperature plasma diagnostics (1992)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 63 (1992), S. 4753-4756 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: This paper describes the between shots data analysis on TFTR using the one-dimensional equilibrium kinetic analysis code SNAP. SNAP accepts as input data: the measured plasma size and current, toroidal field, surface voltage, plasma composition (total Zeff and Zeff contribution from metallic impurities), edge neutral density, auxiliary heating power data (neutral beam power, energy, injection geometry and/or rf power and frequency), and measured profiles of Te(R), ne(R), Ti(R), Vφ(R), and Prad(R). SNAP iteratively calculates: (1) the mapping of profile data to a minor radius grid, (2) the magnetic topology including Shafranov shifted circular flux surfaces, (3) neutral beam attenuation and deposition profiles, (4) unthermalized beam ion density and beam power density delivered to thermal plasma species from a numerical solution to the Fokker–Planck equation, (5) the neutral density profile, (6) local heat and particle transport coefficients consistent with the measured profiles and calculated source terms, (7) ICRF power profiles from a reduced order full wave analysis and isotropic Stix quasilinear model, and (8) total neutron emissivity and plasma stored energy. Several ion heat transport models (including neoclassical χi and χi∝χe) are available to calculate an expected Ti(r) profile in the absence of measurements.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1143630
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  • 6
    Electronic Resource
    Electronic Resource
    Evanescent wave absorption spectroscopy using multimode fibers (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 6070-6074 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Evanescent wave absorption in an aqueous dye solution has been performed using multimode fused silica fiber which was unclad at the sensing region. Evanescent absorbance values for methylene blue in a concentration range 3×10−8 to 5×10−6 M are reported. In order to produce modes close to cutoff in the sensing region, tunneling modes were launched into the clad fiber. Spatial filtering was used to restrict the light launched to those modes which have substantial power in their evanescent field in the unclad region. The measured evanescent absorbance of the dye solution was found to vary linearly with the exposed core length and to exhibit a square root dependence on concentration. The former effect is predicted from standard theory while the latter is attributed to adsorption on the core surface which obeys a Debye–Huckel-type concentration dependence. In addition, a concentration enhancement of two orders of magnitude was observed due to this surface adsorption. While this effect limits the use of the technique for a reversible sensor it may be exploited in disposable probes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.346085
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  • 7
    Electronic Resource
    Electronic Resource
    A class of algorithms for obtaining rational approximants to functions which are defined by power series (1977)
    Springer
    Zeitschrift für angewandte Mathematik und Physik 28 (1977), S. 1121-1131 
    Details
    ISSN: 1420-9039
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Description / Table of Contents: Zusammenfassung Die Arbeit behandelt die Umwandlung von Potenzreihen in entsprechende Kettenbrüche. Es wird die allgemeine Anwendbarkeit einer häufig unberücksichtigten Klasse von Algorithmen gezeigt. Als Anwendung wird eine neue Entwicklung der Gammafunktion hergeleitet.
    Notes: Abstract The problem of converting power series to different types of continued fractions is treated by demonstrating the generality of application of an often neglected class of algorithms. As an example, a new expansion is obtained for the gamma function.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01601678
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  • 8
    Electronic Resource
    Electronic Resource
    Storm-time increases in the ionospheric total electron content (1975)
    [s.l.] : Nature Publishing Group
    Nature 253 (1975), S. 330-331 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] An important feature arising from our investigation is the relationship between the meridional ExB drift of the plasma and west-east ExB drift relative to the Earth. This relation results from the assumption of an incompressible magnetic field. Rishbeth and Hanson2 and Murphy4 have shown that for a ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/253330a0
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  • 9
    Electronic Resource
    Electronic Resource
    Shaped Corrugated Horns for Cosmic Microwave Background Anisotropy Measurements (2000)
    Springer
    International journal of infrared and millimeter waves 21 (2000), S. 2023-2033 
    Details
    ISSN: 1572-9559
    Keywords: anisotropy ; Back-to-Back ; CMB ; corrugated ; gaussian ; profile
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Novel corrugated horn have been modelled, manufactured and measured which give low-sidelobe patterns required by CMB Anisotropy experiments. These horns have a Back-to-Back structure with mode filtering at their centres. They are corrugated to give axial symmetric low-sidelobe patterns, profiled to reduce their length, and have a Gaussian flare at their entrance apertures to further suppress sidelobes to -40dB. Modelling and experimental results show excellent agreement to well below 50 dB.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006784404316
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  • 10
    Electronic Resource
    Electronic Resource
    Distortion of a simple Gaussian beam on reflection from off-axis ellipsoidal mirrors (1987)
    Springer
    International journal of infrared and millimeter waves 8 (1987), S. 1165-1187 
    Details
    ISSN: 1572-9559
    Keywords: Off-axis mirrors ; Gaussian beam optics ; distortion ; cross-polarisation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We examine the distortion of a simple linearly polarised Gaussian beam on reflection from an off-axis ellipsoidal mirror. Expressions are derived for the distorted reflected fields and for the loss of power into higher order and cross-polarised modes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01010819
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