Status of the 10 MV, 120 kA RITS-6 Inductive Voltage Adder

Johnson, D.L.; Bailey, V.; Altes, R.; Corcoran, Patrick; Smith, I.; Cordova, S.; Hahn, Kelly; Maenchen, J.E.; Molina, I.; Portillo, S.; Puetz, E.; Sceiford, M. E.; Valde, D. Van De; Rose, D. V.; Oliver, B.V.; Welch, D. R.; Droemer, D.

doi:10.1109/ppc.2005.300621

Cited by 28 publications

(11 citation statements)

References 1 publication

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“…An example of the falling impedance of the SMP diode is shown in data from Sandia National Laboratories' Radiographic Integrated Test Stand (RITS-6) pulsedpower accelerator [10]. With a 40-magnetically insulated transmission line, the diode nominally produces 150 kA at 7.5 MV.…”

Section: Introductionmentioning

confidence: 99%

Anode plasma dynamics in the self-magnetic-pinch diode

Bruner

Welch

Hahn

et al. 2011

Phys. Rev. ST Accel. Beams

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The self-magnetic-pinch diode is being developed as an intense electron beam source for pulsed-powerdriven x-ray radiography. In high-power operation, the beam electrons desorb contaminants from the anode surface from which positive ions are drawn to the cathode. The counterstreaming electrons and ions establish an equilibrium current. It has long been recognized, however, that expanding electrode plasmas can disrupt this equilibrium and cause rapid reduction of the diode impedance and the radiation pulse. Recently developed numerical techniques, which enable simultaneous modeling of particle currents with 10 13 cm À3 densities to plasmas of near solid density, are applied to a model of the self-magnetic-pinch diode which includes the formation and evolution of anode surface plasmas. Two mechanisms are shown to cause rapid impedance loss, anode plasma expansion into the anode-cathode (A-K) gap, and increased ion space-charge near the cathode surface. The former mechanism dominates for shorter A-K gaps, while the latter dominates for longer gaps. Model results qualitatively reproduce the time-dependent impedances measured for this diode.

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Section: Introductionmentioning

confidence: 99%

Anode plasma dynamics in the self-magnetic-pinch diode

Bruner

Welch

Hahn

et al. 2011

Phys. Rev. ST Accel. Beams

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“…Linear transformer drivers can potentially achieve compactness and low cost by going directly from DC-charged capacitors to a 100-ns pulse propagating on a vacuum or water transmission line, without any of the pulsecompression sections normally associated with large pulse-power drivers [9][10][11][12][13][14][15]. The basic building block of an LTD system called a ''brick'' typically consists of two capacitors, a triggered switch, toroidal rings of magnetic material, and a magnetically insulated transmission line (MITL) [16] in vacuum.…”

Section: Introductionmentioning

confidence: 99%

Low-inductance gas switches for linear transformer drivers

Woodworth

Alexander

Gruner³

et al. 2009

Phys. Rev. ST Accel. Beams

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We are investigating several alternate gas-switch designs for use in linear transformer drivers. To meet linear-transformer-driver (LTD) requirements, these air-insulated switches must be DC charged to 200 kV, be triggerable with a jitter of 5 ns or less, have very low prefire and no-fire rates ( $ 1 in 10 4 shots), and have a lifetime of at least several thousand shots. Since the switch inductance plays a significant role in limiting the rise time and peak current of the LTD circuit, the inductance needs to be as low as possible. The switches are required to conduct current pulses with $100-ns rise times and 20-80 kA peak currents, depending on the application. Our baseline switch, designed by the High Current Electronics Institute in Tomsk, Russia, is a six-stage switch with an inductance on the order of 115 nH that is insulated with 47-67 psia of air. We are also testing three smaller two-stage switches that have inductances on the order of 66-100 nH. The smaller switches are insulated with 92-252 psia of air.

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“…Older machines at the Atomic Weapons Establishment (AWE) in England are based on marx generator capacitive energy storage and Blumlein pulse compression. Modern radiography accelerators such as RITS [2], Mercury [3], and Hydrus [4,5] use inductive voltage adder (IVA) technology [6]. Inductive voltage adders consist of multiple series IVA cells coupled to a single stalk forming a magnetically insulated transmission line (MITL) which is coupled at the high voltage end to an electron beam diode.…”

Section: Introductionmentioning

confidence: 99%

Design of a 7-MV Linear Transformer Driver (LTD) for down-hole flash x-ray radiography.

Cordova¹,

Welch

Oliver³

et al. 2008

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Pulsed power driven flash x-ray radiography is a valuable diagnostic for subcritical experiments at the Nevada Test Site. The existing dual-axis Cygnus system produces images using a 2.25 MV electron beam diode to produce intense x-rays from a small source. Future hydrodynamic experiments will likely use objects with higher areal mass, requiring increased x-ray dose and higher voltages while maintaining small source spot size. A linear transformer driver (LTD) is a compact pulsed power technology with applications ranging from pulsed power flash x-ray radiography to high current Z-pinch accelerators. This report describes the design of a 7-MV dual-axis system that occupies the same lab space as the Cygnus accelerators. The work builds on a design proposed in a previous report [1]. This new design provides increased diode voltage from a lower impedance accelerator to improve coupling to low impedance diodes such as the self magnetic pinch (SMP) diode. The design also improves the predicted reliability by operating at a lower charge voltage and removing components that have proven vulnerable to failure. Simulations of the new design and experimental results of the 1-MV prototype are presented. *

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Status of the 10 MV, 120 kA RITS-6 Inductive Voltage Adder

Cited by 28 publications

References 1 publication

Anode plasma dynamics in the self-magnetic-pinch diode

Anode plasma dynamics in the self-magnetic-pinch diode

Low-inductance gas switches for linear transformer drivers

Design of a 7-MV Linear Transformer Driver (LTD) for down-hole flash x-ray radiography.

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