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  • 1
    Electronic Resource
    Electronic Resource
    The beam breakup instability in quadrupole and solenoidal electron-beam transport systems (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 71 (1992), S. 3091-3102 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Dispersion relations are derived to determine the growth rate, dominant wavelength, and group velocity of disturbances caused by the beam breakup instability. Considerations include weak and strong focusing, x-y coupling in solenoidal transport, the spacing of accelerator cavities, and periodically pulsed beams. Beam breakup growth is minimum when the cavity spacing equals an integral number of half-betatron wavelengths for quadrupole focusing, and an integral number of betatron wavelengths for solenoidal focusing. Minimum growth is also found for periodic pulses separated by an integral number of half-periods of the TM110 cavity mode. Expressions for beam breakup growth at the minima are obtained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.351000
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  • 2
    Electronic Resource
    Electronic Resource
    Recent x-ray backlight source development at KMS : Eighth topical conference on high—temperature plasma diagnostics (1990)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 61 (1990), S. 2762-2764 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The development of intense x-ray sources and sensitive gated detectors is needed for the diagnosis of ICF implosions. A laser plasma x-ray source, with an instantaneous power of 200–500 MW in the range 2.7–3 keV, was used to evaluate a specific detector configuration. The detector, consisting of a PET crystal and a MCP framing camera, was used to obtain radiographs of NaCl-doped targets. Applications are currently signal limited, indicating the need for brighter x-ray sources and/or more sensitive detection systems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1141823
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  • 3
    Electronic Resource
    Electronic Resource
    Beam breakup growth and reduction experiments in long-pulse electron beam transport (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 1258-1266 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The results of an experimental program whose sole objective is to investigate the cumulative beam breakup instability (BBU) in electron beam accelerators are presented. The BBU growth rate scalings are examined with regard to beam current, focusing field, cavity Q, and propagation distance. A microwave cavity array was designed and fabricated to excite and measure the cumulative BBU resulting from beam interactions with the deflecting TM110 cavity mode. One phase of this experiment used high Q(≈1000) cavities with relatively large frequency spread (Δf/f0≈0.1%). The observed TM110 mode microwave growth between an upstream (second) and a downstream (tenth) cavity indicated BBU growth of 26 dB for an electron beam of kinetic energy of 750 keV, 45 A, and focused by a 1.1 kG solenoidal field. At beam currents of less than 100 A the experiments agreed well with a two-dimensional continuum theory; the agreement was worse at higher beam currents ((approximately-greater-than)100 A) due to beam loading. The second-phase experiments used lower Q(≈200) cavities with relatively low frequency spread (Δf/f0≈0.03%). Theory and experiment agreed well for beam currents up to 220 A. Distance scaling experiments were also performed by doubling the propagation length. Instability growth reduction experiments using the technique of external cavity coupling resulted in a factor of four decrease in energy in BBU growth when seven internal beam cavities were coupled by microwave cable to seven identical external dummy cavities. A theory invoking power sharing between the internal beam cavities and the external dummy cavities was used to explain the experimental reduction with excellent agreement using an equivalent circuit model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.356429
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  • 4
    Electronic Resource
    Electronic Resource
    Effect of x-y coupling on the beam breakup instability (1991)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 58 (1991), S. 699-701 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In solenoidal beam transport systems, motions in the x and y directions are coupled by the v×B force. A two-dimensional coupled mode description of the beam breakup (BBU) instability is presented; its dispersion relation is derived and compared with the one-dimensional BBU dispersion relation. In the two-dimensional description, instability growth is doubled and two additional wave modes are found in the regime of strong focusing. In the weak focusing regime, the two-dimensional description gives the same dispersion relation as the one-dimensional model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.105219
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  • 5
    Electronic Resource
    Electronic Resource
    Confinement of a potassium plasma in a spindle cusp magnetic field (1986)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 60 (1986), S. 3056-3067 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The confinement properties of a low-β (average) potassium plasma produced by contact ionization in a spindle cusp magnetic field were investigated. In this configuration, ne≈108–1010 cm−3, Te≈Ti≈0.2 eV, and the ions are weakly magnetized. Electron and ion densities, space potentials, and plasma flow velocities were measured in the ring and point cusps. The leak width of the escaping plasma was measured over a wide range of magnetic field strengths and neutral pressures. The dependence of the leak width on neutral pressure and magnetic field strength is accounted for by a simple model in which the plasma streams out of the cusps along the magnetic field lines while diffusing across the magnetic field due to the combined effects of neutral-particle collisions and Bohm diffusion. Measurements of broadband plasma noise suggest the presence of ion acoustic wave turbulence.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.337761
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  • 6
    Electronic Resource
    Electronic Resource
    Electron-beam-induced acoustic-wave enhancement of gaseous combustion (1989)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 65 (1989), S. 782-791 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The combustion rate of premixed gases in a closed vessel was increased by injecting a high-current electron beam into the gas mixture within about 20 ms of spark ignition. This effect was observed with the fuels ethylene, methane, ethane, propane, and n-butane. Experimental results provide strong evidence that e-beam excitation of the fundamental longitudinal-acoustic mode of the cylindrical chamber is the mechanism of combustion enhancement. An observable combustion enhancement required that the amplitude of the fluid velocity oscillation in this acoustic mode be greater than or approximately equal to the flame propagation speed and was associated with a wrinkled or cellular flame structure with dimensions on the order of 1/2 cm. These results are in good agreement with values for the threshold acoustic velocity amplitude and dimension of cellular structure predicted for a periodically accelerated flame.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.343068
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  • 7
    Electronic Resource
    Electronic Resource
    Effects of electron beam injection on ethylene-air combustion (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 62 (1987), S. 2553-2555 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Results are presented of the first experiments in which high-current electron beam injection is shown to modify the combustion of both lean and rich ethylene-air mixtures. The rate of pressure rise in the chamber increases by up to a factor of 2 and flame speed increases by 40%–50% for cases in which an electron beam is injected into a spark-ignited nonstoichiometric ethylene-air mixture. Spectroscopic emission from the flame is modified by electron beam injection with more rapid rise and decay of OH line emission. Further research is needed to identify the cause of the observed enhancement in combustion rate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.339477
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  • 8
    Electronic Resource
    Electronic Resource
    Extraction of edge radiation within a straight section of Aladdin : Papers from the 12th National Synchrotron Radiation Instrumentation Conference (2002)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 73 (2002), S. 1423-1426 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Edge radiation may be extracted by a slotted mirror located within a straight section of the Aladdin electron storage ring. For wavelengths exceeding 1 mm, this method is expected to provide a greater flux than a large aperture located downstream of a straight section or bending magnet source. The edge radiation within an Aladdin straight section may find application as a broadband source for wavelengths of 1 μm–60 mm, or as a diagnostic of the bunch length through coherent emission. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1435813
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  • 9
    Electronic Resource
    Electronic Resource
    Infrared radiation from bending magnet edges in an electron storage ring : The 9th National conference on synchrotron radiation instrumentation (1996)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 67 (1996), S. 3346-3346 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The infrared radiation emitted by electrons entering or exiting a storage ring bending magnet, which is termed "edge'' radiation, is computed. The numerical results are in agreement with experimental observations at a wavelength of 1 μm. A comparison is made with the infrared synchrotron radiation emitted from the central region of a bending magnet for wavelengths of 1 μm–1000 μm. The flux of the edge radiation is lower than that of the synchrotron radiation for the shorter wavelengths studied, and greater for the longer wavelengths. However, the brightness of the edge radiation is higher for all of the wavelengths studied. This suggests that edge radiation may be a promising infrared radiation source. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1147455
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  • 10
    Electronic Resource
    Electronic Resource
    Deflection of carbon dioxide laser and helium-neon laser beams in a long-pulse relativistic electron beam diode (1991)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 62 (1991), S. 1776-1782 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Deflection of carbon dioxide and helium-neon laser beams has been used to measure plasma and neutral density gradients during the operating mode and after the shorting time of a long-pulse field-emission electron beam diode. Plasma density gradients of (1014–1015) cm−4 were observed throughout the diode during the final microsecond of the 2–3 μs electron beam pulse. The neutral density gradient was less than 1×1018 cm−4 during the electron beam pulse. Upon diode shorting, neutral density gradients increased to (1018–1019) cm−4 over ∼1 μs, and decayed over many microseconds. Plasma density gradients of ∼1015 cm−4 were also observed after shorting. These experiments demonstrate the value of carbon-dioxide laser and helium-neon laser deflection for diagnosing plasma and neutral particles in long-pulse electron beam diodes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1142421
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