1 / 2

PMI Laboratory Experiments

PMI Laboratory Experiments. R. Doerner “Mixed Interactions of W, Be, C, D & He” Pure He plasmas exhibit strong temperature dependence of W surface morphology and reduced tungsten sputtering (W fuzz) D-He plasmas show reduced D retention in W (~35x) and Be; not observed in C

stacy
Download Presentation

PMI Laboratory Experiments

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. PMI Laboratory Experiments • R. Doerner “Mixed Interactions of W, Be, C, D & He” • Pure He plasmas exhibit strong temperature dependence of W surface morphology and reduced tungsten sputtering (W fuzz) • D-He plasmas show reduced D retention in W (~35x) and Be; not observed in C • Presently studying D retention in Be codeposits and fluence-material matrix of D-implanted C/Be/W mixed materials (both by TDS) • D. Nishijima “Observations of suppressed retention and blistering for W exposed to D+He mixture plasmas” • D-He plasmas suppress blisters in SR-W & RC-W; TFG W-TiC shows no blisters in D or D-He plasmas and much lower D retention (x100) • D-He plasmas show high density of near-surface nano-size bubbles (D barrier) • G. Oehrlein “Influence of Tungsten/Carbon Interactions On Carbon Erosion Behavior In D2 Plasma” • Using ellipsometry to monitor a-C:H film evolution in a ICP reactor • Monolayer of W coverage reduces film erosion (~8x) and increases roughness • XPS indicates W removal is slow • R. Ochoukov “Study of radio frequency sheath rectification in Alcator C-Mod” • Katsumada plasma potential probe is being developed to study RF sheath rectification in Alcator C-Mod (benchmarked against emissive probe) • M. Shimada “First result of tritium experiment from TPE at INL” • Depth profiles on Mo & W show T reaching mm past the surface (amount?) • Mo & W deuterium retention are similar to previous measurements

  2. PMI Laboratory Experiments • R. Kolasinski “Characterization of W and C surfaces exposed to low energy plasmas and ion beams” • Blister formation on W in D plasmas shows strong T dependence; correlation with WC • Strong dependence of D retention on BET surface area observed in CFCs • LEIS measurements and simulations being used to study H binding to W surface • Gas driven permeation being measured (< 500 ºC); new system being built (< 1000 º C) • C. Taylor “Complex chemical interactions of lithium, deuterium, and oxygen on lithium-coated graphite PFC surfaces” • XPS of controlled surfaces and NSTX tiles are being used to understand bonding • Li bonding with C and O; all play a role in D retention • V. Surla “Recent Results from IIAX: Sputtering and Thermal Evaporation Studies of Lithiated Graphite” • Suppressed Li evaporation observed from ATJ graphite surfaces (10X); D further reduces • Li sputtering of Li-C surface similar to Li surface (suppressed compared with C surface); D does not reduce • M. Jaworski “Observations of Thermo-Electric MHD Driven Flows in the SLiDE Apparatus” • First results from SLiDE demonstrating Qp = 0.7 MW/m2 (Q = 180 MW/m2 m) • TEMHD flows dominate over TCMHD; give rise to azimuthal flow and heat spreading • D. Hillis “Research opportunities provided by a high flux linear plasma device for Plasma-Surface Interaction Studies” • US fleet of PMI tools is in need of an upgrade; ORNL is studying helicon source design

More Related