Insulations for metallic glasses in pulse power systems

Smith, Carl H.; Turman, B.N.; Harjes, H.C.

doi:10.1109/16.75201

Cited by 8 publications

(19 citation statements)

References 6 publications

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“…Present results with 2605 SC exceed 90% of the ideal, which is better than the maximum of 76% ideal achieved with wind after anneal. [5].…”

Section: Discussionmentioning

confidence: 99%

“…[5] Its thickness and cost violate our requirements, but it appears suitable for test purposes, to evaluate anneal-after-wind. The packing fractions were between 20-30% with mica paper, and would have reached 40% if densely packed.…”

Section: Anneal After Wind Feasibility Testsmentioning

confidence: 99%

“…After the as-cast core is characterized, we anneal at 365∞ C for 2 hours in a nitrogen atmosphere. [5] We then repeat the magnetic measurements. The results with 5 cm wide cores wound with 5 lbs.…”

Section: Anneal After Wind Feasibility Testsmentioning

confidence: 99%

“…[4] The performance is significantly enhanced by magnetic annealing [5] where the ribbon is heated to ~360∞ C in an inert atmosphere while a magnetic field is applied parallel to the ribbon. If the material is annealed, prior to winding into a core, it loses 24% or more of its flux swing capability.…”

Section: Introductionmentioning

confidence: 99%

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Magnetic core studies at LBNL and LLNL

Molvik

Faltens

Reginato

et al. 1998

Nuclear Instruments and Methods in Physics Research Section A:

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The objective of this work is to minimize the cost of the materials and maximize the performance of magnetic cores, a major cost component of a Heavy-Ion-Fusion, HIF, induction accelerator driver. This includes selection of the alloy for cost and performance, and maximizing the performance of each alloy evaluated. The two major performance parameters are the magnetic flux swing and the energy loss. The volt seconds of the cores, obtained from the flux swing with Faraday's Law, determines the beam energy and duration. Core losses from forming domains and moving their boundaries are a major factor in determining the efficiency of an induction accelerator.

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“…Present results with 2605 SC exceed 90% of the ideal, which is better than the maximum of 76% ideal achieved with wind after anneal. [5].…”

Section: Discussionmentioning

confidence: 99%

Section: Anneal After Wind Feasibility Testsmentioning

confidence: 99%

Section: Anneal After Wind Feasibility Testsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Magnetic core studies at LBNL and LLNL

Molvik

Faltens

Reginato

et al. 1998

Nuclear Instruments and Methods in Physics Research Section A:

View full text Add to dashboard Cite

show abstract

“…To achieve a cost goal of ,$10 9 for a driver, induction core costs must be much less than the present ϳ$20 $150͞kg in small quantities. A near term integrated-beam experiment, currently being evaluated, could use the order of 30 150 3 10 3 kg (depending on the beam duration between 0.25 and 1 ms flattop and the final energy of [10][11][12][13][14][15][16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Induction core alloys for heavy-ion inertial fusion-energy accelerators

Molvik

Faltens

2002

Phys. Rev. ST Accel. Beams

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Induction core alloys are evaluated that are appropriate for heavy-ion induction accelerators to drive heavy-ion inertial fusion (HIF) power plants. Parameters evaluated include the usable flux swing and the energy loss over a range of magnetization rates of ϳ10 5 10 7 T͞s, corresponding to pulse durations of ϳ20 to 0.2 ms, respectively. The usable flux swing, for minimum core losses, extends from near the reversed remanent field to about 80% of the saturation field. The usable flux swing is enhanced, with little increase in losses, by annealing the core after winding. Maintaining low energy loss at high magnetization rates requires insulation to block interlaminar eddy currents. To obtain annealed cores with a high ratio of remanent to saturation magnetic field, the insulation must withstand annealing temperatures and apply minimum mechanical stress to the core during cooldown. We find that commercially available insulating coatings for amorphous metals either break down near 10 6 T͞s (a factor of 10 below the requirement), or do not achieve the maximum remanent field and hence the usable flux swing after annealing. More satisfactory coatings are available for silicon steel and nanocrystalline alloys, which could have applications in HIF. Amorphous alloys are capable of meeting most HIF needs, especially with improved coatings.

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Surface degradation of styrene acrylonitrile exposed to corona discharge

Handala

Lamrous

2007

Int Trans Elec Energy Syst

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SUMMARYAn experimental investigation of the degradation of styrene acrylonitrile (SAN) exposed to corona discharge under ambient conditions was presented. SAN specimens were subjected to a corona stress generated by two plane parallel electrodes. The surface physicochemical changes were studied using scanning electron microscope, energy-dispersive X-ray analysis, Fourier transformed infrared spectroscopy and surface resistance measurements.The results showed significant damage on the specimen' surface caused by the corona discharge. Surface erosion was seen in the micrographs and colour change was observed on the aged surface.The surface resistance dropped rapidly during the first hours of exposure to the corona discharge, then approached a saturation value asymptotically. It was established that hydrophilic hydroxyl (O-H) and carbonyl (C --O) groups have formed on the surface of the aged sample. Moisture adsorbed by the hydrophilic OH groups plays an important role in the decrease of the surface resistance, as, under dry conditions after removal from the corona discharge, the surface resistance increased and tended to recover its original value.

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Insulations for metallic glasses in pulse power systems

Cited by 8 publications

References 6 publications

Magnetic core studies at LBNL and LLNL

Magnetic core studies at LBNL and LLNL

Induction core alloys for heavy-ion inertial fusion-energy accelerators

Surface degradation of styrene acrylonitrile exposed to corona discharge

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