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Low-pressure ion source

Description: A low pressure ion source for a neutron source comprises a filament cathode and an anode ring. Approximately 150V is applied between the cathode and the anode. Other electrodes, including a heat shield, a reflector and an aperture plate with a focus electrode, are placed at intermediate potentials. Electrons from the filament drawn out by the plasma and eventually removed by the anode are contained in a magnetic field created by a magnet ring. Ions are formed by electron impact with deuterium o… more
Date: October 27, 1982
Creator: Bacon, F.M.; Brainard, J.P.; O'Hagan, J.B. & Walko, R.J.
Item Type: Refine your search to only Text
Partner: UNT Libraries Government Documents Department
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Formulary for MEQALAC design

Description: From the space-charge limits for quadrupole transport systems discussed in an earlier report, some simple relations are obtained that will assist in the design of practical systems.
Date: November 27, 1979
Creator: Maschke, A.W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Measurements of the emittance and current density profile of the beam produced by the ATA injector

Description: Measurements of the normalized emittance of the beam produced by the Advanced Test Accelerator (ATA) injector yielded values near 0.4 Radian-Centimeters at currents up to 10 kAmps. The instrument was also used to obtain beam-current-density profiles in two dimensions at the entrance mask of the instrument.
Date: June 27, 1983
Creator: Fessenden, T.J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Experimental test accelerator (ETA)

Description: The Lawrence Livermore Laboratory is constructing an induction linac with the following parameters 10kA, 50ns FWHM pulse width, 5MeV, and 5PPS. This paper describes the design features of the 2.5 MeV injector and it's associated pulsed power system.
Date: March 27, 1979
Creator: Hester, R. E.; Bubp, D. G.; Clark, J. C.; Chesterman, A. W.; Cook, E. G.; Dexter, W. L. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Resistive Wall Heating Due to Image Current on the Beam Chamber for a Superconducting Undulator.

Description: The image-current heating on the resistive beam chamber of a superconducting undulator (SCU) was calculated based on the normal and anomalous skin effects. Using the bulk resistivity of copper for the beam chamber, the heat loads were calculated for the residual resistivity ratios (RRRs) of unity at room temperature to 100 K at a cryogenic temperature as the reference. Then, using the resistivity of the specific aluminum alloy 6053-T5, which will be used for the SCU beam chamber, the heat loads… more
Date: March 27, 2012
Creator: Kim, S. H. (Accelerator Systems Division (APS))
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Correlation of Beam Parameters to Decelerating Gradient in the E-167 Plasma Wakefield Acceleration Experiment

Description: Recent experiments at SLAC have shown that high gradient acceleration of electrons is achievable in meter scale plasmas [1,2]. Results from these experiments show that the wakefield is sensitive to parameters in the electron beam which drives it. In the experiment the bunch length and beam waist location were varied systematically at constant charge. Here we investigate the correlation of peak beam current to the decelerating gradient. Limits on the transformer ratio will also be discussed. The… more
Date: June 27, 2007
Creator: Blumenfeld, I.; Berry, M.; Decker, F. -J.; Hogan, M. J.; Ischebeck, R.; Iverson, R. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Mevva ion source operated in purely gaseous mode

Description: We have operated a vacuum arc ion source in such a way as to form beams of purely gaseous ions. The vacuum arc configuration that is conventionally used to produce intense beams of metal ions was altered so as to form gaseous ion beams, with only minimal changes to the external circuitry and no changes at all internally to the ion source. In our experiments we formed beams from oxygen (O{sup +} and O{sub 2}{sup +}), nitrogen (N{sup +} and N{sub 2}{sup +}), argon (Ar{sup +}) and carbon dioxide (… more
Date: March 27, 2003
Creator: Yushkov, G.Y.; MacGill, R.A. & Brown, I. G.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Simulation and measurement of the electrostatic beam kicker in the low-energy undulator test line.

Description: An electrostatic kicker has been constructed for use in the Low-Energy Undulator Test Line (LEUTL) at the Advanced Photon Source (APS). The function of the kicker is to limit the amount of beam current to be accelerated by the APS linac. Two electrodes within the kicker create an electric field that adjusts the trajectory of the beam. This paper will explore the static fields that are set up between the offset electrode plates and determine the reaction of the beam to this field. The kicker was… more
Date: October 27, 1998
Creator: Waldschmidt, G. J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Electron Beam/Converter Target Interactions in Radiographic Accelerators

Description: Linear induction accelerators used in X-ray radiography have single-pulse parameters of the order 20 MeV of electron beam energy, 2 kA of beam current, pulse lengths of 50-100 ns, and spot sizes of 1-2 mm. The thermal energy deposited in a bremsstrahlung converter target made of tantalum from such a pulse is {approx}80 kJ/cc, more than enough to bring the target material to a partially ionized state. The tail end of a single beam pulse, or any subsequent pulse in a multi-pulse train, undergoes … more
Date: May 27, 2003
Creator: McCarrick, J.; Caporaso, G.; Chambers, F.; Chen, Y. J.; Falabella, S.; Goldin, F. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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In Depth Diagnostics for RF System Operation in the PEP-II B Factory

Description: The PEP-II RF systems incorporate numerous feedback loops in the low-level processing for impedance control and operating point regulation. The interaction of the multiple loops with the beam is complicated, and the systems incorporate online diagnostic tools to configure the feedback loops as well as to record fault files in the case of an RF abort. Rapid and consistent analysis of the RF-related beam aborts and other failures is critical to the reliable operation of the B-Factory, especially … more
Date: May 27, 2005
Creator: Van Winkle, Daniel; Fox, John & Teytelman, Dmitry
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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ATA gas propagation - 1 foot tank experiment

Description: The first gas propagation experiment on ATA is planned to be conducted in a 1-foot diameter tank of up to 10 m length. The primary objectives are to measure beam parameters at injection to determine whether the desired beam conditioning is achieved, and to observe how such conditioned beams propagate in air and neon.
Date: June 27, 1984
Creator: Chong, Y. P.; Caporaso, G. J.; Chambers, F. W.; Fawley, W. M.; Lauer, E. J.; Paul, A. C. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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A 100-kV, 2-kA, 2.5-{micro}S Pulser for Developing and Calibrating Long-Pulse Diagnostics

Description: The development of voltage and current probes for measuring an electron beam's current and position associated with several microsecond-long pulses from advanced Linear Induction Accelerators requires a precision pulser that can deliver both high voltages and high currents to a diagnostics Test Line. Seven-stage, type-E PFNs have been utilized in both a transformer and 4-stage Marx (plus/minus) configuration. The resulting 50-ohm pulser delivers to the Test Line a repeatable 100 kV, ca. 2 {micr… more
Date: June 27, 1999
Creator: Carlson, R.L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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