R. Doerner, May 9, 2005 PFC Program Review, PPPL PISCES ITER-simulation experiments on Mixed-Materials (Be, C, W) R. P. Doerner, M. J. Baldwin and D. Nishijima.

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Presentation transcript:

R. Doerner, May 9, 2005 PFC Program Review, PPPL PISCES ITER-simulation experiments on Mixed-Materials (Be, C, W) R. P. Doerner, M. J. Baldwin and D. Nishijima Center for Energy Research, University of California – San Diego D. G. Whyte University of Wisconsin - Madison K. Schmid, J. Roth and A. Wiltner Max-Plank Institute for Plasmaphysics, Garching, Germany

R. Doerner, May 9, 2005 PFC Program Review, PPPL US-EU Collaboration on Mixed-Material PMI Effects for ITER has been extended for 3 years The erosion, deuterium retention and codeposition properties of graphite exposed to a beryllium-containing deuterium plasmas The erosion, deuterium retention and codeposition properties of tungsten exposed to deuterium plasma containing beryllium impurities (as well as with and without (in TPE) carbon impurities) The erosion and deuterium retention behavior of beryllium exposed to deuterium plasma at temperatures approaching the Be melting temperature U.S. - R. Doerner – UCSDE.U. – A. Loarte - EFDA Focused on two main experimental aspects: Verification of surface and edge plasma models: TRIDYN (IPP), ERO (KFA), WBC (ANL), UEDGE (UCSD)

R. Doerner, May 9, 2005 PFC Program Review, PPPL PISCES-B, and Its Associated Surface Analysis Laboratory, Are Compatible with Beryllium Operations. - The PISCES-B plasma generator is contained in a separate enclosure to prevent release of beryllium particulates into the general lab. - All personnel entering the enclosure wear full coverage personal protective equipment and follow strict entry and exit procedures when performing routine maintenance, machine repair, or sample handling/exchange operations. - The entire enclosure has a specially designed ventilation system that filters all input and output air streams.

R. Doerner, May 9, 2005 PFC Program Review, PPPL PISCES-B linear plasma device simulates ITER diverted field line geometry

R. Doerner, May 9, 2005 PFC Program Review, PPPL PISCES-B has been modified to allow exposure of samples to Be seeded plasma

R. Doerner, May 9, 2005 PFC Program Review, PPPL A small beryllium impurity concentration in the plasma drastically suppresses carbon erosion -50 V bias, 200ºC, T e = 8 eV, n e = 3 e 12 cm -3 Chemical erosionPhysical sputtering

R. Doerner, May 9, 2005 PFC Program Review, PPPL Be rich surface layers form during exposure and shield underlying carbon from erosion ITER will have 1-10% Be impurity concentration in the divertor plasma Weight loss data confirms reduction in erosion seen spectroscopically Be surface concentration after 5000 sec. P-B exposure. Weight loss (mg/cm 2 )

R. Doerner, May 9, 2005 PFC Program Review, PPPL Plasma conditions:  D ~3x10 18 cm -2 s -1, T e ~ 6eV, n e ~ cm -3, T ~500 K, D Ion Fluence ~2x10 22 cm -2 No Be seeding  m = - 62 mg ATJ graphite Not exposed ~0.1 % Be seeding  m = - 5 mg AES - 85 % Be, 10% O & 5% C Be layer forms on C targets with a complicated three dimensional structure

R. Doerner, May 9, 2005 PFC Program Review, PPPL Be impurities from the ITER first wall can also form Be-rich surfaces on the tungsten baffle plates Be layers have been observed on on W surfaces, as well as C Plasma exposure conditions –Be conc. ~0.1% –E ion ~ 75 eV –T W ~ 300°C –Ion flux ~ 1x10 22 m -2 s -1 –Exposure time = 5000 sec. Surface has 12 times as much Be as W indicating formation of Be 12 W tungsten beryllide alloy (T melt of Be 12 W ~ 1500°C) Surface morphology of a W target exposed to a Be seeded deuterium plasma in PISCES-B

R. Doerner, May 9, 2005 PFC Program Review, PPPL If alloy formation (carbide or beryllide) is responsible for Be layers, then subsequent Be deposition should be quickly re-eroded, which means Be alloy layers should be thin. W sample (AES data) f Be = 0.1%, 5000 sec., T W = 300°C Estimated Thickness (nm) 5060 C sample, 175°C, f Be ~0.15%

R. Doerner, May 9, 2005 PFC Program Review, PPPL The dynamic behavior of the Be layer may help decipher the mechanisms responsible for surface layer formation on C and W substrates PISCES-B conditions: f Be ~ 0.001,  pl = 3e18 cm -2 s -1,  Be = 3e15 Be/cm 2 s or 1 Be monolayer/sec 0.04% Be 0.16% Be Be layers can form slowly on C samples under PISCES-B conditions Be layers appear to form rapidly on W samples under PISCES-B plasma conditions

R. Doerner, May 9, 2005 PFC Program Review, PPPL Erosion mechanism will determine fuel retention. Fuel accumulation within ITER is a critical operational and safety issue PISCES witness plate manipulator (WPM) allows investigation of codeposited material eroded from targets PISCES target analysis examines implantation and saturation issues associated with high-flux plasma interaction locations NRA (at IPP and UW-Madison) and TDS (at UCSD) allow quantitative comparison of retention measurements

R. Doerner, May 9, 2005 PFC Program Review, PPPL WPM samples show collection of beryllium rich deposits during Be seeding runs Carbon target : 300ºC target exposureCarbon target : 700ºC target exposure No WPM data yet from W targets, but large loss rate of incident Be ions on W targets (re-erosion or reflection) quickly causes coating of diagnostic windows during Be seeding runs

R. Doerner, May 9, 2005 PFC Program Review, PPPL T retained in Be rich codeposits can be more easily removed during divertor bakeout Although more hydrogen isotopes are retained during lower temperature codeposition, they are more easily desorbed ITER can bake divertor to 375°C (after coolant drain) Codeposits will be in line-of- sight of erosion location Oxygen bake may not be needed to remove fuel atoms from codeposits ITER bake

R. Doerner, May 9, 2005 PFC Program Review, PPPL Hydrogen isotopes are not so easily removed from locations of direct plasma contact Data from erosion dominated regimes in PISCES More fuel atoms are retained in targets during Be seeding runs Presence of Be has little influence on desorption characteristics of C targets Flash heating of strikepoints (i.e. laser, flashlamp or controlled plasma power deposition) could be used if target retention becomes an issue for ITER TDS of C targets w/ & w/o Be seeding

R. Doerner, May 9, 2005 PFC Program Review, PPPL US-EU Collaboration on Be/C/W has produced significant new results, but more work is needed. Understand mechanism responsible for Be-rich layer formation at very low impurity Be concentration (~0.1%) Develop/benchmark models that can predict the dynamic behavior of the Be coating process Subject layers to ELM style heat pulses during formation Investigate similarities and differences of W & C targets Investigate concurrent Be and C injection into D plasma Investigate role of other impurities (i.e. oxygen, carbon, radiating noble gases) W-Be alloy formation is a critical issue needing immediate attention (melting temperature, thermal properties, formation rates, tritium retention, etc.) See talk by M. Baldwin

R. Doerner, May 9, 2005 PFC Program Review, PPPL Be impurities may dominate PMI (specifically tritium accumulation) in devices with large area Be walls Need to accurately predict first wall erosion rates (CX, diffusion, convective transport) Understanding SOL flows in confinement devices is crucial to predicting divertor impurity content Need benchmarked PMI models to predict behavior of surfaces with some confidence