Solid-state kicker pulser for DARHT-2

Cook, E.G.; Lee, B.S.; Hawkins, Steven A.; Anaya, E.; Allen, F.V.; Hickman, B.C.; Sullivan, J.; Brooksby, Craig

doi:10.1109/ppps.2001.1002175

Cited by 12 publications

(3 citation statements)

References 3 publications

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“…Inductive adder is a relatively new scheme of pulse power generation, which is typically composed of N single-turn transformers with a common secondary winding to generate the required pulse power [2][3][4][5][6][7][8]. Especially recently, inductive adder pulsers using solid-state semiconductor power devices, such as insulated-gate bipolar transistors (IGBTs) [9] and metal-oxide-semiconductor field-effect transistors (MOSFETs) [8,[10][11][12][13][14], have been developed.…”

Section: Jinst 18 T07005mentioning

confidence: 99%

A low characteristic impedance quasi-rectangular pulser based on solid-state inductive adder for High rEpetition rate Muon Source at CSNS

et al. 2023

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A solid-state inductive adder-based quasi-rectangular pulser featuring a low characteristic impedance has been developed in the laboratory to demonstrate the technical viability of using such a pulser for the HEMS muon source. The pulser consists of five layers connected in series, with each layer comprising 24 parallel branches. The paper mainly presents the design of the low characteristic impedance quasi-rectangular pulser from three aspects: primary driver circuit, coaxial central structure and transformer magnetic core. The experimental results show that through the careful design of the above three items, a quasi-rectangular pulse with fast rise and fall time can be achieved. The typical parameters of pulse voltage, pulse current, pulse flattop, repetitive rate, rise time and fall time at a charging voltage of 700 V are 3.5 kV, 560 A, 315 ns, 1 kHz, 47 ns, and 66 ns, respectively, on a 6.25 Ω matching resistor. In addition, the output characteristics of the pulser are investigated by varying critical parameters such as the charging voltages, the load resistances, and the number of parallel branches. The findings and results outlined in this paper offer valuable insights for the initial phase of developing an inductive adder pulser. They can aid in assessing the feasibility of the project, selecting critical parameters for essential components, and enhancing the output pulse's performance. A full-scale pulser with a peak pulse current of 3 kA and rise and fall time of ≤ 75 ns for HEMS muon source will be developed in the near future.

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Section: Jinst 18 T07005mentioning

confidence: 99%

A low characteristic impedance quasi-rectangular pulser based on solid-state inductive adder for High rEpetition rate Muon Source at CSNS

et al. 2023

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“…The injector voltage is about 2.1 MV. The Axis-II beam can be chopped into bunches for multipulse radiographic experiments [3,4,5]. This work refers specifically to Axis-II.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of methods to increase beam pulse width on the DARHT Axis-II accelerator

Rose¹,

Crawford²,

Ekdahl³

et al. 2013

2013 Abstracts IEEE International Conference on Plasma Science (ICOPS)

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The second axis (Axis II) of the Dual-Axis Radiographic Hydrodynamic Test (DARHT) facility at Los Alamos National Laboratory (LANL) is an electron linear induction accelerator (LIA) using 74 induction cells, each driven by a separate pulse-forming Marx (PFM). The ability to perform precise multipulse radiography is heavily influenced by the temporal beam energy spread, beam pulse width, related beam motion, and other focusing and target factors. The nominal beam-pulse flattop width is about 1.6 s. A wider beam pulse would allow for increased spacing between kicked pulses and hence more information in radiographic experiments. A flattop pulse-width increase of even 75 to 100 ns would be of significant value.In this paper, we present a few recently evaluated methods to widen the existing beam pulse without significant changes to the accelerator or infrastructure. The first method is a constrained optimization between total beam energy (sum of all the cell and injector voltages) and maximum cell pulse width. It determines the voltage set point of each of the PFMs that drive the cells such that their respective pulse widths are nearly identical while being subject to a constraint of minimum acceptable total beam energy. Each cell has a unique magnetic core V-s capability, and properly setting pulse voltages allows for maximum pulse width based on individual core properties. The second method involves retiming the cell pulses such that their trailing edges align instead of their leading edges. The leading edge of the cell pulses are of less importance than the trailing, hence, if the end of the beam pulse can be improved, additional pulse width suitable for radiography can be obtained. The third method focuses on the preset current for the magnetic cores in the cells. To achieve sufficient flux swing in the cores, each is preset to a known saturation state prior to each pulse. Experiments have shown that the levels of preset current vary by more than 15% and the timing of the preset pulses can be adjusted to obtain additional improvement in available V-s capability. After adding the available increases in beam pulse width from these separate methods, we expect to be able to obtain over 100 ns in usable pulse width. The paper presents the results from simulations, experiments and describes measured and expected increases in pulse width due to each of the methods.

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“…Normally, the beam is bent and collected at the beam dump. When performing radiographic experiments, the kicker chops the beam and sends bunches down the transport line to the X-ray converter (target) [6,7,8]. X-rays illuminate the device under test, and special cameras record the images.…”

Section: Introductionmentioning

confidence: 99%

Linear-induction-accelerator beam-energy-spread minimization: Cell models and timing optimization

Rose

Ekdahl

Schulze

2012

2012 IEEE International Power Modulator and High Voltage Conference (IPMHVC)

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The second axis (Axis II) of the Dual-Axis Radiographic Hydrodynamic Test (DARHT) facility at Los Alamos National Laboratory (LANL) is a linear induction accelerator (LIA) using 74 cells, each driven by a separate pulsed-power modulator. The summation of the injector and 74 cell voltages is the beam-energy temporal profile. The ability to perform precise multi-pulse radiography is heavily influenced by the temporal beam energy spread, related beam motion, and other focusing and target factors. Beam loading affects both the shape and magnitude of each cell's voltage during the pulse. Ideally, each pulsed-power modulator/cell pair is tuned such that the loaded-cell voltage is flat with minimal amplitude variation during the pulse. However, changes in operating parameters on Axis II (beam current, operating cell voltage) have altered the amount of flattop variation resulting in more energy spread than when commissioned.In this paper, we present an optimization and synthesis method which minimizes the beam's temporal energy spread by adjusting the timing of cell voltages, either advancing or retarding them, such that the injector voltage plus the summed cell voltages in the LIA result in a flatter energy profile. The method accepts as inputs the beam current, injector voltage, cell-voltages, and synthesizes loaded cell voltages as needed. Simulations and experimental data for both unloaded and loaded-cell timing optimizations are presented. For the unloaded cells, the pre-optimization baseline energy spread was reduced by over 30 % as compared to baseline. For the loaded-cell case, the measured energy spread was reduced by 49% compared to baseline.

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Solid-state kicker pulser for DARHT-2

Cited by 12 publications

References 3 publications

A low characteristic impedance quasi-rectangular pulser based on solid-state inductive adder for High rEpetition rate Muon Source at CSNS

A low characteristic impedance quasi-rectangular pulser based on solid-state inductive adder for High rEpetition rate Muon Source at CSNS

Evaluation of methods to increase beam pulse width on the DARHT Axis-II accelerator

Linear-induction-accelerator beam-energy-spread minimization: Cell models and timing optimization

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