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Title: High Energy Radiation Megavolt Electron Source - HERMES III.


Abstract not provided.

Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
Report Number(s):
DOE Contract Number:
Resource Type:
Resource Relation:
Conference: Proposed for presentation at the Electricity SUbsector Coordinating Council & Government Executives Meeting held September 9, 2016 in Albuquerque, NM.
Country of Publication:
United States

Citation Formats

Pope, Steven S. High Energy Radiation Megavolt Electron Source - HERMES III.. United States: N. p., 2016. Web.
Pope, Steven S. High Energy Radiation Megavolt Electron Source - HERMES III.. United States.
Pope, Steven S. 2016. "High Energy Radiation Megavolt Electron Source - HERMES III.". United States. doi:.
title = {High Energy Radiation Megavolt Electron Source - HERMES III.},
author = {Pope, Steven S.},
abstractNote = {Abstract not provided.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 2016,
month = 8

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  • Abstract not provided.
  • The REX machine at Los Alamos is being used to generate a 4-MW, 5-kA, 50-ns electron beam. The beam is produced by a planar velvet cathode, accelerated through a foilless anode aperture, and transported by an air core magnetic lens. Extensive measurements of the time-resolved (<1 ns) properties of the beam using a streak camera and high speed electronic diagnostics have been made. These parameters include beam current voltage, current density, and emittance for a single cathode/anode configuration. Results indicate beam brightness in excess of 10/sup 8/A/m/sup 2/-rad/sup 2/. Numerical simulations of the experiment have been performed with ISIS, amore » time-dependent PIC code, and are in good agreement with the measurements. This electron beam source is being considered as an injector to a linear induction accelerator and can be operated at higher voltages and currents as a stand-alone flash x-ray machine. 7 refs., 8 figs.« less
  • Measurements of energy deposition as function of equilibrator thickness and position in the HERMES III radiation field are compared to ITS code predictions. The onset of dose-rate effects in CaF{sub 2} TLDs have also been observed at 10{sup 10} Gy/s levels. 10 refs., 3 figs.
  • A high-intensity mode for Hermes III gamma simulator at Sandia National Laboratories, providing an average dose rate of 2.5 {times} 10{sup l3} rads(Si)/s over a 2:1 uniformity area of 80 cm{sup 2}, has been reported previously. This source provides an average dose of 370 krad(Si) over the useful area in a radiation pulse with a rise time of 8 ns and a pulse width of 11 ns. Use of this source permits photon testing of radiation effects in a regime previously accessible only underground or using e-beam simulation. This work characterizes both the spatial and temporal variations of the radiationmore » field produced by the high-intensity source. This radiation source depends on the transport of a converging electron beam in a gas cell to the converter, where the forward-directed character of the bremsstrahlung results in the formation of a radiation focus slightly downstream of the faceplate. Because the electron trajectories vary during the radiation pulse, the time history of the radiation is a function of position.« less