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  • 1
    Series available for loan
    Series available for loan
    Reserves of the Herrin (No. 6) Coal in the Fairfield Basin in southeastern Illinois (1975)
    Urbana, Ill.
    Associated volumes
    Details Availability
    Call number: SR 90.1035(489)
    In: Circular
    Type of Medium: Series available for loan
    Pages: 31 S. + 2 Beil.
    Series Statement: Circular / Illinois State Geological Survey 489
    Language: English
    Location: Lower compact magazine
    Branch Library: GFZ Library
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  • 2
    Electronic Resource
    Electronic Resource
    Recommissioning the deuterium negative ion source experiment ion source for studies in support of ignition device to test engineering concepts : Proceedings of the 7th international conference on ion sources (1998)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 69 (1998), S. 983-985 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: As part of the international collaborative effort into fusion research, work has begun to recommission the deuterium negative ion source experiment (DENISE) at Dublin City University (DCU). Modifications to the original apparatus to allow easier access to both the ion source and the extraction region for diagnostic systems are nearing completion. A new source chamber that can be used with both the standard Langmuir probe, and a new laser photo-detachment probe, currently under construction, was installed. The source chamber can be operated in any one of three modes: filament driven, continuous wave (cw), radio frequency (rf) driven, or pulsed rf driven (up to 3 kW of 13.5 MHz rf at 250 Hz). A PC computer control system based on LabView™ is nearing completion and is intended for both system control and data logging. An investigation into the production and extraction of H− ions has begun. Langmuir probe measurements on a hydrogen plasma have yielded information on the plasma parameters for three radial probe positions over the pressure range 5–100 mTorr, and the rf power range 25–600 W cw. The article will present the current status of DENISE. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1148608
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  • 3
    Electronic Resource
    Electronic Resource
    Enhanced volume production of negative ions in the post discharge of a multicusp hydrogen discharge (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 2009-2014 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In this paper we demonstrate a new concept in the production of negative hydrogen ions in a low-pressure multicusp discharge. The discharge voltage is modulated to produce a non-Maxwellian, hot-electron plasma during the current pulse, followed by a cool Maxwellian electron plasma in the post discharge. This procedure, of separating in time the required hot and cold electron plasmas required for volume H− production, is called a temporal filter. The time evolution of the electron energy distribution function is measured using the time-resolved second derivative of a Langmuir probe characteristic. Time-resolved measurements of the negative ion density are made using laser photodetachment. The measurements show that the negative ion density in the center of the source, at a gas pressure of 0.07 Pa, increases by a factor of 2 when the discharge is switched off. At this low pressure the average H− beam current extracted from the source, when operated with a discharge current of 1 A in the pulse modulated mode exceeds the H− beam current from a 5 A continuously operated source. The increase in efficiency of the pulsed source is explained in terms of a two-step H− production mechanism.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.349486
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  • 4
    Electronic Resource
    Electronic Resource
    Comment on "Application of low-temperature ions in the nonequilibrium state plasma of a Penning source'' [J. Appl. Phys. 69, 7933 (1991)] (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 1007-1007 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In a recent communication Sato et al. [J. Appl. Phys. 69, 7933 (1991)], it states that the high current output of multiply charged ions, Ii, where i is the charge state, during the early part of the discharge in a pulsed Penning source is due to the long ion confinement time. They argue that Ii is proportional to the ion confinement time, τ, however, it is shown here that Ii is proportional to τ i−1 and not τ. The power dependence better explains the experimental results but does not conclusively prove the importance of τ.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.354036
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  • 5
    Electronic Resource
    Electronic Resource
    Time-resolved electron energy distribution function measurements in a pulsed magnetic multipole hydrogen discharge (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 3461-3466 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The time evolution of measured plasma parameters, including the electron energy distribution function (EEDF), in the discharge and post-discharge regime of a pulsed hydrogen magnetic multipole plasma is presented. The time necessary for the plasma to reach equilibrium has been established as 160 μs. The present results clarify the mechanisms which initiate the discharge. The decay rates of the charged-particle density and energy in the post-discharge have been measured. These measurements indicate that particle transport to the wall is the dominant loss mechanism for both charged-particle density and energy. The time-resolved EEDF is found to be non-Maxwellian in the discharge and Maxwellian in the late post-discharge.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.348531
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  • 6
    Electronic Resource
    Electronic Resource
    Plasma parameters of a radio frequency discharge : International conference on ion sources (1990)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 61 (1990), S. 448-450 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A low-frequency (100 kHz) radio frequency discharge has been characterized by making time-resolved measurements of the basic plasma parameters, including the electron energy-distribution function. Measurements obtained when operating with H2, D2, and Ar are compared. Surprisingly low electron temperatures (∼0.2 eV) have been found in H2 and D2 discharges.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1141269
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  • 7
    Electronic Resource
    Electronic Resource
    Computer simulations of rapid granular shear flows between parallel bumpy boundaries (1990)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 2 (1990), S. 1042-1044 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In this Brief Communication the results of numerical simulations for the rapid, steady shear flow of identical disks are compared with the recent predictions of Hanes et al. [J. Appl. Mech. 55, 969 (1988)] for the shear stress, normal stress, and gap width. The smooth and nearly elastic disks are driven by identical, parallel, bumpy boundaries. The variations of the dynamic friction coefficient are confirmed by the simulations. The coefficient may be made large or small by suitably preparing the boundaries of the cell. The simulations also indicate that the predictions of kinetic theory apply to gaps as small as three particle diameters in width.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.857642
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  • 8
    Electronic Resource
    Electronic Resource
    A high magnetic field EPR spectrometer (1989)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 60 (1989), S. 3681-3684 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We describe a tunable electron paramagnetic resonance (EPR) spectrometer designed to operate at frequencies between 160 and 525 GHz and magnetic fields of up to 20 T. To operate in such a broad frequency range we use a very stable optically pumped far infrared laser. The performance of the spectrometer has been measured with solid and liquid samples. This allows us to outline the potential uses of the spectrometer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1140474
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  • 9
    Electronic Resource
    Electronic Resource
    Automatic Langmuir probe plasma diagnostic (1987)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 58 (1987), S. 475-476 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The hardware implementation of a computer-based Langmuir probe technique is described. The technique, which is applicable in a wide range of dc plasma conditions, allows a full range of plasma parameters to be measured efficiently.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1139256
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  • 10
    Electronic Resource
    Electronic Resource
    Langmuir probe technique for plasma parameter measurement in a medium density discharge (1986)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 57 (1986), S. 2210-2217 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The development of a microcomputer-controlled electrostatic probe as a diagnostic technique is described. The technique uses cylindrical probes and the definitive theory of Laframboise to give rapid measurements of the plasma parameters in a medium density (1010 to 1012 cm−3) plasma including the fast electron density and temperature. The iterative technique described overcomes many of the problems associated with established methods of Langmuir probe analysis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1138684
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