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Progress on the Flash X-Ray Optical Transition Radiation Diagnostic

Description: This document summarizes the Flash X-Ray accelerator (FXR) optical transition radiation (OTR) spot-size diagnostics efforts in FY07. During this year, new analysis, simulation, and experimental approaches were utilized to interpret OTR spot data from both dielectric foils such as Kapton (VN type) and metal coated foils. Significant new findings of the intricacies involved in the diagnostic and of FXR operational issues were achieved. Geometry and temperature based effects were found to affect t… more
Date: March 30, 2008
Creator: Tang, V; Houck, T & Brown, C
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Overview of the ETA/ATA pulse power

Description: A pulsed electron accelerator has been constructed and is now in operation at the Lawrence Livermore Laboratory. This Experimental Test Accelerator (ETA) a 5 MeV, 10 kA, 50 ns FWHM, five pulse burst at 1 kHz, was designed to be the front end or injector for the Advanced Test Accelerator (ATA). The ATA is presently under construction and will have the following parameters: beam energy - 50 MeV, beam current - 10 kA, pulse length - 70 ns, repetition rate in a ten pulse burst - 1 kHz. The paramete… more
Date: May 30, 1980
Creator: Reginato, L. L. & Hester, R. E.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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High current electron linacs (advanced test accelerator/experimental test accelerator)

Description: The high current induction accelerator development at the Lawrence Livermore National Laboratory is described. The ATA facility is designed for 10 kA peak currents, 50 nsec pulse lengths and 50 MeV energies. At this time, half of the design current has been accelerated through the entire machine to particle energies of about 45 MeV. Current problem areas and operational experience to date will be discussed. Several key technical areas required development for the ATA machine; this report will s… more
Date: April 30, 1984
Creator: Briggs, Richard J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Production of Actinium-225 via High Energy Proton Induced Spallation of Thorium-232

Description: The science of cancer research is currently expanding its use of alpha particle emitting radioisotopes. Coupled with the discovery and proliferation of molecular species that seek out and attach to tumors, new therapy and diagnostics are being developed to enhance the treatment of cancer and other diseases. This latest technology is commonly referred to as Alpha Immunotherapy (AIT). Actinium-225/Bismuth-213 is a parent/daughter alpha-emitting radioisotope pair that is highly sought after becaus… more
Date: December 30, 2011
Creator: Harvey, James & Jerry Nolen, George Vandegrift, Itacil Gomes, Tom Kroc, Phil Horwitz, Dan McAlister, Del Bowers, Vivian Sullivan, John Greene
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Transvers Impedance Measurements of the Modified DARHT-2Accelerator Cell Design

Description: The DARHT-2 accelerator cells have been redesigned to make their high voltage performance more robust. At the outset of the DARHT-2 development program about 8 years ago, an extensive campaign was mounted to minimize the transverse impedance of the original cell design. Since the initial spec on the machine was a beam current of 4 kA, the control of beam-breakup (BBU) amplification with a 2 microsecond pulse length was considered to be one the most critical issues in the design. Even after adva… more
Date: November 30, 2005
Creator: Briggs, Dick & Waldron, Will
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Ring RF and longitudinal dynamics in the SNS

Description: Average beam currents of 40 A will be present in the Spallation Neutron Source. Even though the entire cycle time is only one synchrotron oscillation the longitudinal phase space determines peak beam current and momentum spread. Both factors play a role in space charge and instability dynamics. Longitudinal simulations with beam loading and longitudinal space charge have been done in the design phase.
Date: June 30, 2000
Creator: Blaskiewicz, M.; Brennan, J. M.; Brodowski, J.; Delong, J.; Meth, M.; Onillon, E. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Nonlinear Charge and Current Neutralization of an Ion Beam Pulse in a Pre-formed Plasma

Description: The propagation of a high-current finite-length ion beam in a cold pre-formed plasma is investigated. The outcome of the calculation is the quantitative prediction of the degree of charge and current neutralization of the ion beam pulse by the background plasma. The electric magnetic fields generated by the ion beam are studied analytically for the nonlinear case where the plasma density is comparable in size with the beam density. Particle-in-cell simulations and fluid calculations of current … more
Date: January 30, 2001
Creator: Kaganovich, Igor D.; Shvets, Gennady; Startsev, Edward & Davidson, Ronald C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Implications of the PSR instability for the SNS

Description: The Los Alamos Proton Storage Ring suffers from a violent, high frequency, transverse instability at high beam current. The Spallation Neutron Source will be similar to the PSR and one must insure that the PSR instability will not keep SNS from reaching its design goal. Efforts toward understanding the instability are described.
Date: June 30, 2000
Creator: Blaskiewicz, M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Upgrades to the LLNL flash x-ray induction linear accelerator (FXR)

Description: The FXR is an induction linear accelerator used for flash radiography at the Lawrence Livermore National Laboratory's Site 300 Test Facility. The FXR was originally completed in 1982 and has been in continuous use as a radiographic tool. At that time the FXR produced a 17MeV, 2.2 kA burst of electrons for a duration of 65 ns. An upgrade of the FXR was recently completed. The purpose of this upgrade was to improve the performance of the FXR by increasing the energy of the electron injector from … more
Date: June 30, 1997
Creator: Scarpetti, R. D., LLNL
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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In-beam production and transport of radioactive {sup 17}F at ATLAS.

Description: Beam currents of radioactive {sup 17}F(T{sub 1/2} = 65s) as high as 2 x 10{sup 6} s{sup {minus}1} have been produced at the ATLAS facility and delivered to target for nuclear physics research. The d({sup 16}O, {sup 17}F)n and p({sup 17}O,{sup 17}F)n reaction were used to produce the {sup 17}F in the energy range of 65-110 MeV with {sup 17}F intensities of up to 250 pnA. The target employed is a liquid nitrogen cooled H{sub 2} gas cell, with HAVAR windows, operating at up to 8 x 10{sup 4} Pa pre… more
Date: November 30, 1998
Creator: Pardo, R. C.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Time-dependent beam focusing at the DARHT-II injector diode

Description: The injector for the second axis of the Dual-Axis Radiographic Hydrotest Facility (DARHT) is being designed and constructed at LBNL. The injector consists of a single gap diode extracting 2{micro}s, 2kA, 3.2 MeV electron beam from a 6.5 inches diameter thermionic dispenser cathode. The injector is powered through a ceramic column by a Marx generator. We also investigated the possibility of extracting a beam current of 4 kA. The focusing system for the electron beam consists of a Pierce electros… more
Date: July 30, 1999
Creator: Eylon, S.; Henestroza, E.; Fawley, W. & Yu, S.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Induction accelerators for the phase rotator system

Description: The principle of magnetic induction has been applied to the acceleration of high current beams in betatrons and a variety of induction accelerators. The linear induction accelerator (LIA) consists of a simple nonresonant structure where the drive voltage is applied to an axially symmetric gap that encloses a toroidal ferromagnetic material. The change in flux in the magnetic core induces an axial electric field that provides particle acceleration. This simple nonresonant (low Q) structure acts … more
Date: July 30, 2001
Creator: Reginato, Lou; Yu, Simon & Vanecek, Dave
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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