Performance of the hermes-III gamma ray simulator

Ramirez, J.J.; Prestwich, K.R.; Johnson, D.L.; Corley, J.P.; Denison, G.J.; Alexander, J. A.; Franklin, T.L.; Pankuch, P.J.; Sanford, T. W. L.; Sheridan, Timothy J.; Torrison, L.L.; Zawadzkas, G.A.

doi:10.1109/ppc.1989.767415

Cited by 42 publications

(9 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The Hermes-III facility is a 16 MV, 500 kA pulsed electron beam accelerator capable of producing 30 ns pulses of bremsstrahlung radiation into an outdoor test cell [4]. The fissionable targets in question included a 30×30×2.5 cm depleted uranium (DU) plate, a 1000 cm 3 DU cube, and a 10×10×2 cm low-enriched uranium (LEU) plate.…”

Section: Methodsmentioning

confidence: 99%

Outdoor stand-off interrogation of fissionable material with a hybrid coded imaging system

Hutcheson

Phlips

Wulf

et al. 2013

2013 19th IEEE Pulsed Power Conference (PPC)

View full text Add to dashboard Cite

A hybrid coded imaging and detection system developed at the U.S. Naval Research Laboratory (NRL) was used for active interrogation measurements with pulsed bremsstrahlung at the Hermes-III facility at Sandia National Laboratories, Albuquerque. This work follows previous experiments performed in 2011 [1] and explores different targets and system conditions to the previous work. The techniques used and challenges encountered during this work are described.

show abstract

Section: Methodsmentioning

confidence: 99%

Outdoor stand-off interrogation of fissionable material with a hybrid coded imaging system

Hutcheson

Phlips

Wulf

et al. 2013

2013 19th IEEE Pulsed Power Conference (PPC)

View full text Add to dashboard Cite

show abstract

“…In addition, the electron temperature of the plasma can be used to calculate the emittance of the extracted electron beam. The hard X-ray and -ray measurements on DARHT Axis-I are different than in pulsed power diodes [1,6,7] because they are not generated from electron impact on a single target surface. They are generated over a large surface area by the scraping of lower energy electrons during the rise and fall of the extraction pulse.…”

Section: Introductionmentioning

confidence: 97%

“…Some of these facilities are dedicated to studying cathode materials and the relevant physics associated, while others focus on improving the radiographic quality of their facility. Each of these facilities produces a different Xray spectrum and axial and transverse distributions [1][2][3][4][5][6][7][8]. The spectrum and distributions are characteristic of the achievable electron beam or X-ray spot size on target and the energy distribution.…”

Section: Introductionmentioning

confidence: 99%

Characterizing the photon spectrum in the DARHT Axis-I diode

Coleman¹,

Johnson²,

McCuistian³

et al. 2014

2014 IEEE 41st International Conference on Plasma Sciences (ICOPS) Held With 2014 IEEE International Conference on High-Power P

View full text Add to dashboard Cite

An array of photon diagnostics have been deployed on a high power relativistic electron beam diode. Surface flashover of a carbon fiber velvet cathode generates a discharge from which electrons are accelerated through a 17.8 cm diode. This discharge is assumed to be a hydrocarbon mixture. A small portion of the off energy electrons (1-3 MeV) accelerated during the rise and fall of the 80 ns FWHM pulse impact the beam pipe and generate a Bremsstrahlung spectrum of 0.1-3 MeV photons. The principal objective of these experiments is to quantify the dynamics of the hard X-ray and -ray flux generated in the diode region, in addition to quantifying dynamics of the visible photons generated, and the ion species of the surface discharge on the velvet cathode. A qualitative comparison of different diagnostic results are presented, which include time resolved measurements with X-ray PIN diodes, a PMT, and CCD images. In addition initial visible spectroscopy measurements will also be presented.

show abstract

“…To produce different pulses on the same facility to drive various diodes, it is necessary to develop an MIVA that could work at several modes with little configuration change. For instance, Hermes-III accelerator could produce a pulse of 20 MV and 750 kA when operating at the standard mode [4], [5]. Without changing any hardware, Hermes-III could also operate at half-voltage or double-pulse mode by rearranging the firing time of the two sides of pulse forming lines (PFLs) [6].…”

Section: Introductionmentioning

confidence: 99%

Azimuthal Transmission Lines for Inductive Voltage Adders With Four PFLs Driving Simultaneously or Separately

Wei

Sun

Qiu

et al. 2014

IEEE Trans. Plasma Sci.

View full text Add to dashboard Cite

In this paper, an inductive cell driven by four pulse forming lines (PFLs), capable of operating at two modes to create a single pulse or four separate pulses, is proposed. A single hardware configuration of azimuthal lines must meet the different requirements of the two operating modes. The optimizations and tradeoffs of azimuthal lines for these two modes are presented. Four candidate azimuthal line configurations that are compatible with either mode are proposed. The cell output voltage and azimuthal uniformity of feed currents are simulated, respectively. The simulation results indicate that the cylinder azimuthal line with four equidistant tabs connected to the cathode palates is the most suitable configuration. As the input pulses are 1000 kV and 25-ns rise time, at the mode with four PFLs driving simultaneously, the cell would produce a pulse with a peak of 865 kV and a rise time of 46 ns into 1.5-load. Meanwhile, it could create four separate pulses of 980 kV and 32-ns rise time into 5-load with each PFL driving separately. In this case, the azimuthally asymmetric coefficient is calculated to be 25.6%. In addition, the voltage of undriven ports, i.e., the voltage applied across the separating switches, is estimated to be about 1150 kV. Index Terms-Azimuthal transmission line, magnetically insulated inductive voltage adders (MIVAs), pulse forming line (PFL),separating switch, symmetrizing current flow.

show abstract

Performance of the hermes-III gamma ray simulator

Cited by 42 publications

References 5 publications

Outdoor stand-off interrogation of fissionable material with a hybrid coded imaging system

Outdoor stand-off interrogation of fissionable material with a hybrid coded imaging system

Characterizing the photon spectrum in the DARHT Axis-I diode

Azimuthal Transmission Lines for Inductive Voltage Adders With Four PFLs Driving Simultaneously or Separately

Contact Info

Product

Resources

About