J. B. O. Caughman

The effect of high-power transient events on tungsten and tungsten coatings used for radio frequency launcher applications

J. B. O. Caughman, Katie Browning, Katie Butler, Sabrina E. Calzada et autres

High-temperature plasma-facing material coatings used for radio frequency (RF) launchers need to be robust enough to survive RF breakdown arcing or other transient events from the plasma (e.g., an edge localized mode) without causing a catastrophic failure of the coating. High-power transient …

The effect of high-power transient events on tungsten and tungsten coatings used for radio frequency launcher applications

J. B. O. Caughman, Katie Browning, Katie Butler, Sabrina E. Calzada et autres

High-temperature plasma-facing material coatings used for radio frequency (RF) launchers need to be robust enough to survive RF breakdown arcing or other transient events from the plasma (e.g., an edge localized mode) without causing a catastrophic failure of the coating. High-power transient …

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Erosion of high-Z refractory coatings for helicon plasma source window

G. D. Dhamale, Marlene I. Patino, M.J. Baldwin, J. B. O. Caughman et autres

Abstract Proto-MPEX (Materials Plasma Exposure eXperiment), a linear plasma device (LPD), using a high power radio frequency (RF) (⩾100 kW, 13.56 MHz) helicon plasma source, has suffered RF sheath-induced window erosion. The sputtered impurities from the window surface transport toward the downstream …

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Contributors

Mu-Young Ahn, Giacomo Aiello, Jean Paul Allain, Steffen Antusch et autres

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Plasma heating technology

J. B. O. Caughman, Gregory M. Wallace

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Research and Development to Reduce Impurity Production and Transport of the Impurities to the Target in Linear Plasma Devices Using Helicon Plasma Sources

J. Rapp, M.J. Baldwin, Clyde Joshua Beers, Timothy S. Bigelow et autres

Linear plasma devices used to test plasma facing materials (PFMs) and components for fusion reactors are often suffering under the production of intrinsic impurities from the plasma source system. Most linear plasma devices use internal electrodes (hollow cathodes, reflex arc, or cascading …

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Filterscope Techniques for Parasitic Signal Screening

Keith H. Butler, J. B. O. Caughman, Curtis A. Johnson, D. C. Easley et autres

The filterscope diagnostic uses bandpass filters and photomultiplier tubes (PMTs) to detect specific spectral emission lines. A filterscope was used to measure the W I 400.88 nm line emission as a function of ion energy on the Radio Frequency Plasma Interaction Experiment …

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Investigation of Materials for Radio Frequency Antenna Plasma Facing Components

J. B. O. Caughman, Keith H. Butler, Davide Curreli, David Donovan et autres

The interaction of radio frequency (RF) sheaths with fusion reactor relevant materials (e.g., tungsten and titanium diboride) is being studied on the RF Plasma Interaction Experiment (RF PIE). The RF PIE consists of an electron cyclotron resonance (ECR) plasma source (2.45 GHz, …

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Final Design of the Material Plasma Exposure eXperiment

J. Rapp, Arnold Lumsdaine, Adam M. Aaron, T. M. Biewer et autres

The Material Plasma Exposure eXperiment (MPEX) has completed its design phase. MPEX will be a unique facility to investigate plasma material interactions (PMIs) under fusion prototypic divertor conditions in steady state. This includes plasma exposure conditions expected in a fusion reactor divertor. …

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Physical and technical basis of Materials Plasma Exposure eXperiment from modeling and Proto-MPEX results *

Cornwall Lau, T. M. Biewer, Timothy S. Bigelow, J. F. Caneses et autres

Abstract The Materials Plasma Exposure eXperiment (MPEX) is a steady-state linear plasma device that will address plasma-material interaction (PMI) science and enable testing of fusion reactor-relevant divertor plasma-facing materials. The MPEX source concept consists of a helicon plasma source to generate the …

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SIZE MATTERS IN TAVR: SMALLER TRANSCATHETER AORTIC VALVES HAVE WORSE BASELINE HEMODYNAMICS AND MORE RAPID DETERIORATION OVER 5 YEARS OF SERIAL ECHOCARDIOGRAPHIC FOLLOW-UP

Margaret Anne Smith, J. B. O. Caughman, John Paul Vavalle, Thomas G. Caranasos

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Ion cyclotron heating at high plasma density in Proto-MPEX

R. H. Goulding, Cornwall Lau, Pawel Piotrowicz, Clyde Joshua Beers et autres

The physics of ion cyclotron heating (ICH) relevant to the steady-state linear machine MPEX (Material Plasma Exposure eXperiment) has been explored in its predecessor, short-pulse device: Proto-MPEX. MPEX will utilize fundamental ICH to increase heat flux at the target and produce ion …

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