Results of vacuum cleaning techniques on the performance of LiF field-threshold ion sources on extraction applied-B ion diodes at 1-10 TW

Cuneo, M. E.; Menge, P.; Hanson, D. L.; Fowler, William; Bernard, Mathieu; Ziska, G.R.; Filuk, A.B.; Pointon, T.D.; Vesey, Roger Alan; Welch, D. R.; Bailey, James E.; Desjarlais, M. P.; Lockner, T.R.; Mehlhorn, T. A.; Slutz, Stephen A.; Stark, M.A.

doi:10.1109/27.602495

Cited by 73 publications

(21 citation statements)

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“…SABRE diodes are among the highest power ion beam devices yet tested and have been described in detail elsewhere [10,12]. IrI the computational work of Pointon [13], calcuhtions of chargeexchange effects in ion diodes showed that for PBFA Ii conditions the contribution of electron or proton impact ionization of neutral atoms to the diode current would be small unless the neutral atom density approached -1015 cm-3, a conclusion similar to previous studies in low power diodes.…”

Section: /'mentioning

confidence: 49%

VUV absorption spectroscopy measurements of the role of fast neutral atoms in a high-power gap breakdown

et al. 2000

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The maximum power achieved in a wide variety of high-power devices, including electron and ion diodes, z pinches, and microwave generators, is presently limited by anode-cathode gap breakdown. A fiequentlydiscussed hypothesis for this effect is ionization of fast neutral atoms injected throughout the anode-cathode gap during the power pulse. We describe a newly-developed diagnostic tool that provides the first .@rect test of this hypothesis. Time-resolved vacuumukaviolet absorption spectroscopy is used to directly probe fast neutral atoms with 1 mm spatial resolution in the 10 mm anode-cathode gap of the SABRE 5 MV, 1 TW applied-B ion diode.Absorption spectra collected during Ar RF glow dischtiges and with C02 gas fills confirm the reliability of the diagnostic technique. Throughout the 50-100 ns ion diode pulses no measurable neutral absorption is seen, setting upper limits of 0.12-1.5x10'4 cm-3 for ground state fast neutral atom densities of H,C~,O#. The absence of molecular absorption bands also sets upper limits of 0.16-1.2x1015 cm-3 for common simple molecules. These limits are low enough to rule out ionization throughout the gap as a breakdown mechanism. This technique can now be applied to quantifi the role of neutral atoms in other high-power de-vices...

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Section: /'mentioning

confidence: 49%

VUV absorption spectroscopy measurements of the role of fast neutral atoms in a high-power gap breakdown

et al. 2000

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“…16,17 The contaminants on an aluminum anode are expected to be dominated by C, H 2 , H 2 O, CO, and CO 2 , 16,33 as well as oxide layers on the aluminum foil.…”

Section: Electrode Plasma Simulationmentioning

confidence: 99%

“…18. The surface density of adsorbed contaminant particles (n) decreases due to thermal and stimulated desorption at a rate given by 17,28 …”

Section: Electrode Plasma Simulationmentioning

confidence: 99%

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The impact of plasma dynamics on the self-magnetic-pinch diode impedance

et al. 2015

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The self-magnetic-pinch diode is being developed as an intense electron beam source for pulsedpower-driven x-ray radiography. The basic operation of this diode has long been understood in the context of pinched diodes, including the dynamic effect that the diode impedance decreases during the pulse due to electrode plasma formation and expansion. Experiments being conducted at Sandia National Laboratories' RITS-6 accelerator are helping to characterize these plasmas using timeresolved and time-integrated camera systems in the x-ray and visible. These diagnostics are analyzed in conjunction with particle-in-cell simulations of anode plasma formation and evolution. The results confirm the long-standing theory of critical-current operation with the addition of a time-dependent anode-cathode gap length. The results may suggest that anomalous impedance collapse is driven by increased plasma radial drift, leading to larger-than-average ion v r Â B h acceleration into the gap. V C 2015 AIP Publishing LLC. [http://dx.

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“…The commercial vacuum cleaners used in houses consist of the paper filter, pre-filter, and exhaust filter through which the clean air discharges to the atmosphere. Though vacuum cleaners are convenient in use, the suction pressure decreases rapidly in proportion to the time of cleaning, and the paper filter also should be replaced periodically due to pressure drops, odors, and bacteria by the residual dust inside the paper filter [1][2][3][4]. And some researchers have designed and tested cyclone for applying to vacuum cleaner [5].…”

Section: Introductionmentioning

confidence: 99%

A study on the optimal design of a cyclone system for vacuum cleaner with the consideration of house dust

Ha¹,

Kim²,

Kim³

et al. 2011

J Mech Sci Technol

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Cyclone, a type of particle collector widely used in the field of ambient sampling and industrial particulate control, is the principal type of gas-solids separator that use a centrifugal force. The goal of this study is to transform conventional cyclone into a new type of cyclone that can be used for the household vacuum cleaners. To meet the goal, first, the analysis about local environment and dust is carried out. Second, it must have enough high-efficiency not to reduce suction power due to clogging of exhaust filter unit. Two single cyclones with central-hopper-dust-outlet and side-wall-dust-outlet and a twin cyclone are designed and fabricated to evaluate, and compare, their dust collection efficiencies and pressure drops. The measurements of separation efficiency for dust by using DMT test dust type 08 are carried out. House dust experiment is additionally performed to check the local matters applicability such as tissue papers, fur and hairs. The collection efficiency of the twin cyclone is found to be 3-6% greater than those of two single cyclones with the same body diameter, inlet and inner cylinder diameter. Twin cyclone with a large body diameter, a small inner cylinder diameter, a short inner cylinder, a narrow inlet has high separation efficiency. This result indicates the possibility of achieving higher collection efficiencies with a twin cyclone.

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Results of vacuum cleaning techniques on the performance of LiF field-threshold ion sources on extraction applied-B ion diodes at 1-10 TW

Cited by 73 publications

References 50 publications

VUV absorption spectroscopy measurements of the role of fast neutral atoms in a high-power gap breakdown

VUV absorption spectroscopy measurements of the role of fast neutral atoms in a high-power gap breakdown

The impact of plasma dynamics on the self-magnetic-pinch diode impedance

A study on the optimal design of a cyclone system for vacuum cleaner with the consideration of house dust

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