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  • 1
    Electronic Resource
    Electronic Resource
    Use of an active wire Bθ cell for electron beam conditioning (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 80 (1996), S. 4249-4257 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The propagation of intense, relativistic electron beams in air is subject to the resistive hose instability. Conditioning the beam prior to injecting it into the air can extend its range by reducing the hose growth rate and by reducing the initial spatial perturbations that seed the hose instability. Experiments have been performed using the SuperIBEX accelerator (Ipeak=10–30 kA, E=4.5 MeV, 40 ns full width at half-maximum) to develop conditioning cells that suppress the hose. This paper describes the performance of an active wire Bθ cell that is used in conjunction with an ion focused regime (IFR) cell. The IFR cell detunes the instability by producing a head-to-tail radius taper on the beam. The wire cell maintains this radius taper while producing an emittance taper that is necessary to suppress the hose growth. In addition, the wire cell reduces the initial beam perturbations through the anharmonic centering force associated with the wire current and its azimuthal magnetic field Bθ. The ability of the Bθ cell to reduce the beam offset with a minimal increase in the beam radius gives it several advantages over the use of a simple, thick scattering foil to perform the radius taper to emittance taper conversion. The SuperIBEX beam propagation distance, in terms of the betatron oscillation scale length, was extended to ∼10λβ using these cells. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.363384
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Radius tailoring of an electron beam using a fast rise-time focusing coil: Experiment and simulation (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 3244-3249 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An experiment demonstrating the production of a "radius-tailored beam,'' which has a larger head and smaller tail for more stable propagation through gas, using a fast rise-time focusing coil is described. The results and their analyses for the radius-tailored case, the untailored case, and the "reverse-tailored'' case are presented. A two-dimensional particle simulation of the experiment was performed for each case using the parameters of the experiment for the inputs and it produces results consistent with the experiment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.357467
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  • 3
    Electronic Resource
    Electronic Resource
    Fast-rise, large-volume, 1.7-kG magnetic-field coil (1993)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 64 (1993), S. 3376-3379 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A one-turn coil of 20 cm diameter and 30 cm length produces a field up to 1.7 kG with a rise time of 30 ns. The rate of rise of field, nearly 6 T/μs, is faster than for any other coil of this size. Powering the coil is a transformer-charged pulse-forming line machine operating at up to 28 kA, 280 kV without deleterious arcing. The field is uniform to 5% over the coil length, focusing an electron beam passing along its axis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1144307
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  • 4
    Electronic Resource
    Electronic Resource
    Temporal evolution of ion energy in a plasma focus (1988)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 31 (1988), S. 703-705 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: For the first time, the temporal structure of ion energy in a plasma focus is revealed using a time-resolving Thomson spectrometer. The velocities and arrival times of ions are determined from the spectrogram. The resulting distribution of ions in velocity–time space at the source is found to be a line distribution, as if the ions were accelerated in a diode by a pulsed voltage.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.866803
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  • 5
    Electronic Resource
    Electronic Resource
    Plasma wake-field effects on high-current relativistic electron beam transport in the ion-focused regime (1992)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 4 (1992), S. 4121-4130 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Modulation of the beam current has recently been observed during ion-focused regime (IFR) transport of a high-power relativistic electron beam propagating through a low-density background plasma. Injecting a high-current, high-energy electron beam into an IFR channel immersed in a background plasma induces plasma oscillations. These background plasma oscillations, induced by the rise-time portion of the beam ejecting plasma electrons from the vicinity of the beam into the background plasma, give rise to a modulated axial electric field. This field travels with the beam leading to beam energy and current oscillations. In the experiment, a 1.7 MeV, 1 kA, rise-time-sharpened electron beam is propagated on a KrF excimer laser-produced IFR channel in trimethylamine (TMA) gas, which is immersed in a low-density plasma-filled transport tube. Experimental measurements, analytical theory, and detailed computer simulations are presented demonstrating modulation of this high-current relativistic electron beam near the low-density background plasma frequency.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.860319
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Time-resolving electron energy spectrometer (1991)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 62 (1991), S. 548-549 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A compact, time-resolving, electron energy spectrometer, which measures the temporal energy behavior of a pulsed relativistic electron beam, is described. It is shown that typical experimental results obtained with an ∼700-keV, 100-ns electron beam are qualitatively in excellent agreement with the diode voltage waveform.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1142107
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Pulse shaping a high-current relativistic electron beam in vacuum (1991)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 62 (1991), S. 2910-2915 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A simple method for shaping the output current pulse of a relativistic electron beam in vacuum is presented. This method has been employed to sharpen the rise time of a high-current relativistic electron beam produced by a 2-MV, 7-kA, 20-ns pulser. The beam has a pulse shape that is approximately triangular both in voltage and current, with a negligible instantaneous energy spread. The desired pulse shape is nominally rectangular in current. The technique utilizes a magnetic lens with a magnitude of approximately 1.5 kG to focus the beam. Passing beam electrons through the magnetic lens causes them to focus at different axial locations downstream from the lens depending upon their energy. The focal point of the beam current peak (corresponding to maximum energy) is then located furthest downstream. An aperture is used near the focus to select a portion of the beam having the desired parameters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1142180
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  • 8
    Electronic Resource
    Electronic Resource
    Simple time-resolving Thomson spectrometer (1987)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 58 (1987), S. 240-244 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We describe a simple time-resolving Thomson spectrometer system which can provide the temporal information of ions produced by a pulsed source, in addition to the time-integrated information. The electric field in a conventional spectrometer is modulated by a time-varying field. It is shown that from the resulting spectrogram, the time-resolved quantities associated with the ions can be deduced. Experimental results with plasma focus produced ions are given as an example.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1139314
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    Paper (German National Licenses)
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  • 9
    Electronic Resource
    Electronic Resource
    Radius tailoring of an intense relativistic electron beam using a fast rise-time focusing coil (1993)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 63 (1993), S. 311-313 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A "radius-tailored'' electron beam, which is tapered with a larger head and a smaller tail, has been generated. This has been accomplished by injecting the electron beam into a fast rise-time magnetic focusing coil, so that the beam head expands while the beam body and tail are confined by the axial magnetic field. Time-resolved beam radius measurements indicate that a beam radius tailoring on the order of 3 to 1 has been achieved. This result is also in agreement with computer simulations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.110766
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