Production of pulsed high-energy neutron bursts from beam-target interaction using a 15 MeV HERMES III ion beam
Open Access
- 1 December 2020
- journal article
- research article
- Published by AIP Publishing in AIP Advances
- Vol. 10 (12), 125106
- https://doi.org/10.1063/5.0023480
Abstract
Intense pulsed neutron fluences are generated by a high-energy (>10 MeV) proton beam using the beam-target method on the HERMES III facility at Sandia National Laboratories [J. J. Ramirez et al., in Proceedings of the 7th International Conference on High Power Particle Beams (Kernforschungszentrum, Karlsruhe GmbH, Karlsruhe, Germany, 1988), p. 148]. In order to generate the high-energy proton beam, a radial ion diode previously developed and fielded at the 6-MeV level in negative polarity was extended in performance to the 15-MeV level. This performance increase is described along with the development of a more durable hardware set to withstand the much more potent 15-MeV proton beam. An extensive series of simulations is developed to characterize the neutrons produced by the proton-target interaction. Particle-in-cell simulations describe the electron and ion dynamics, while Monte Carlo simulations characterize the neutron output. Due to differing estimates of proton beam voltage and current between the respective simulations, we make an approximate estimate of 13.5-MeV to 15-MeV and 120-kA ion beams at peak power in a 40 ns FWHM pulse. Simulations indicate that a total of 1.7 x 10(13) neutrons are generated into 4 pi. Comparison of the neutron output predictions with a limited set of neutron flux measurements suggests a flux level of similar to 1 x 10(10) neutrons/cm(2) to 10 x 10(10) neutrons/cm(2) over an approximately few tens of cm(2) area at the relevant application location. This effort also contributes to physics understanding of the use of inductive voltage adder platforms to drive ion-beam diode loads.Funding Information
- U.S. Department of Energy
This publication has 25 references indexed in Scilit:
- The Dense Plasma Focus: A Versatile Dense Pinch for Diverse ApplicationsIEEE Transactions on Plasma Science, 2012
- Rescaling of equilibrium magnetically insulated flow theory based on results from particle-in-cell simulationsPhysics of Plasmas, 2006
- The physics basis for ignition using indirect-drive targets on the National Ignition FacilityPhysics of Plasmas, 2004
- Photoneutron Production Using Bremsstrahlung from the 14-TW Pulsed-Power HERMES III Electron AcceleratorNuclear Science and Engineering, 1993
- Pinched-beam ion-diode scaling on the Aurora pulserJournal of Applied Physics, 1982
- High-impedance ion-diode experiment on the Aurora pulserJournal of Applied Physics, 1981
- Propagation of power pulses in magnetically insulated vacuum transmission linesJournal of Applied Physics, 1979
- Production of Intense Proton Beams in Pinched-Electron-Beam DiodesPhysical Review Letters, 1976
- Impedance characteristics of diodes operating in the self−pinch modeJournal of Applied Physics, 1975
- Bremsstrahlung and Photoneutrons from Thick Tungsten and Tantalum TargetsPhysical Review C, 1970