Inductive voltage adder driven X-ray sources for hydrodynamic radiography

Maenchen, J.E.; Cordova, S.; Gustwiller, J.; Johnson, D.L.; Menge, P.; Molina, I.; Olson, Craig; Rosenthal, S.E.; Rovang, Dean C.; Oliver, Optic; Welch, D. R.; Bailey, V.; Smith, I.; Droemer, D.; Hunt, E.; Macleod, G.R.; Woo, Lee Dae

doi:10.1109/ppc.1999.825465

Cited by 15 publications

(1 citation statement)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…X-ray framing camera photographs of the x-ray source. The frames are-7.5 mm x 7.5 mm; This behavior is indicative of the onset of an enhanced ion-hose instability [6], which can arise in these types of MITL driven high current density, magnetically immersed dicdes. Suppression of this instability is currently a major focus of this program.…”

Section: B Time Dependent~j Measurementsmentioning

confidence: 92%

Experimental time resolved electron beam temperature measurements using Bremsstrahlung diagnostics

Menge

Maenchen²,

Mazarakis³

et al.

Digest of Technical Papers. 12th IEEE International Pulsed Power Conference. (Cat. No.99CH36358)

View full text Add to dashboard Cite

Electron beam temperature, PL (= vL/v), is important to control for the development of high dose flash radiographic bremsstrahlung sources. At high voltage (> 5 MV) increasing electron beam temperature has a serious deleterious effect on dose production. The average and time resolved behavior of beam temperature was measured during radio~mphic experiments on the HERMES III accelerator (10 MV, 50 kA, 70 ns).A linear array of thermoluminescent dosimeters (TLDs) were used to estimate the time integrated average of beam temperature.On and off-axis photoconducting diamond (PCD) detectors were used to measure the time resolved bremsstrahlung dose rate, which is dependent on beam energy and temperature.The beam temperature can be determined by correlating PCD response with accelerator voltage and current and also by analyzing the ratio of PCD amplitudes on and off axis. This ratio is insensitive to voltage and current and thus, is more reliable than utilizing absolute dose rate. The data is unfolded using comparisons with Monte Carlo simulations to obtain absolute beam temperatures. The data taken on HERMES III show abrupt increases in !3~midway through the pulse indicating rapid onset of beam instability. I. EFFECT OF 9L ON X-RAY DOSEThe successful application of Inductive Voltage Adders (IVAS) to the development of high dose (= kRad at 1. m) flash x-ray radiography requires the production of high current, high voltage electron beams while maintaining low divergence (low beam temperature) [1]. The effect of beam temperature on dose can be seen in figure 1. This graph shows that at 10 MV the on-axis dose is reduced by 60% for an e-beam going from cold tõ L= 0.3 ( 17°divergence).These curves were compiled from several Monte Carlo [2] runs varying the electron beam temperature at 5 and 10 MV. It is, therefore, important to know the beam temperature in experiment in order to compare expected and measured dose, verify physical understanding of the radiographic diode, and examine possible instabilities of which increased PL is a symptom.

show abstract

Section: B Time Dependent~j Measurementsmentioning

confidence: 92%

Experimental time resolved electron beam temperature measurements using Bremsstrahlung diagnostics

Menge

Maenchen²,

Mazarakis³

et al.

Digest of Technical Papers. 12th IEEE International Pulsed Power Conference. (Cat. No.99CH36358)

View full text Add to dashboard Cite

show abstract

Design of a radiographic integrated test stand (RITS) based on a voltage adder, to drive a diode immersed in a high magnetic field

Smith

Bailey

Fockler

et al. 2000

IEEE Trans. Plasma Sci.

View full text Add to dashboard Cite

Design of a large-bore 60-T pulse magnet for Sandia National Laboratories

Rovang

Lesch

et al. 2000

IEEE Trans. Appl. Supercond.

View full text Add to dashboard Cite

Abstract-The design of a new pulsed magnet system for the generation of intense electron beams is presented. Determined by the required magnetic field profile along the axis, the magnet system consists of two coils (Coil #1 and #2) separated by a 32-mm axial gap. Each coil is energized independently. Both coils are internally reinforced with HIM Zylon fiber/epoxy composite. Coil #1 made with AI-15 Glidcop wire has a bore of 110-mm diameter and is 200-mm long; it is energized by a 1.3-MJ, 13-kV capacitor bank. The magnetic field at the center of this coil is 30 T. Coil #2 made with CuNb wire has a bore of 45 mm diameter, generates 60 T with a pulse duration of 60 ms, and is powered by a 4.O-MJ, 17.7-kV capacitor bank. We present design criteria, the coupling of the magnets, and the normal and the fault conditions during operation..

show abstract

Inductive voltage adder driven X-ray sources for hydrodynamic radiography

Cited by 15 publications

References 14 publications

Experimental time resolved electron beam temperature measurements using Bremsstrahlung diagnostics

Experimental time resolved electron beam temperature measurements using Bremsstrahlung diagnostics

Design of a radiographic integrated test stand (RITS) based on a voltage adder, to drive a diode immersed in a high magnetic field

Design of a large-bore 60-T pulse magnet for Sandia National Laboratories

Contact Info

Product

Resources

About