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Highlights from the APS Workshop on Edge Plasma of Tokamaks: 2D Simulations, Experiments, and Challenges

This summary discusses the key topics covered in the APS Workshop on the edge plasma of tokamaks, including presentations on 2D simulations, experiments, and challenges. The workshop featured discussions on various topics such as toroidal spontaneous rotation, gyrokinetic simulations, edge and pedestal turbulence, and tritium recovery.

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Highlights from the APS Workshop on Edge Plasma of Tokamaks: 2D Simulations, Experiments, and Challenges

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  1. Novinky ve fyzice okrajového plazmatuPondělí 12:20, FTTF Vybrané partie z fyziky fůze Prezentace z APS Paralelní toky plazmatu okraje tokamaku 2D simulace ESEL x experiment Summary workshopu o camerach E:\Users\Common\Meetings\APS07FloridaHoracekSummary

  2. Core plasma • Buttery: nice tutorial on NTM (in 2001 he did it on Compass) • J. Rice: overview of toroidal spontaneous rotation, correlated with better confinement; challenge for theorists • Hammet: review on gyrokinetic simulations of core plasma • animation • huge progress: wrt. start of GK (1980’s), in steps up to 1023 in alghorithms (described) and 105 in computer power => getting in experimental agreements in more phenomenas • edge and pedestal turbulence is still challenge for future => for Compass GK not interesting

  3. Edge turbulence – experiment • Scarin on RFX: Gas puff imaging • Tomographic reconstruction, photodiodes • Spatial resolution : 5 mm • View area : 70 mm x 30 mm • Bandwidth: 2MHz! (10x faster than the Hungarian camera for Compass) • Ahn: SOL widths ?? • LaBombard: Invited tutorial: critical gradients and flows in pedestal. G≠Dn, n= ncrit. • Furno: observation of blob generation from drift-waves • Terry & Zweben: 2D turbulence GPI at X-point shows inconsistency wrt. simple flux tube mapping of blobs from midplane concerning its velocities and shape -> new physics in Bout to be included. • Movies on http://www.pppl.gov/~szweben/ • J. Horacek: oral a lot changed, OK but bad session choice. • LFS is Gamma-distributed (indication of blobs/avalanches) whilst top not on CASTOR. Perhaps on top it’s a stiff density pedestal + blobs transferred parallel from LFS. • Blobs in ESEL are too small wrt. Experiment on TCV • Te fluctuations in ESEL are OK for TCV

  4. Edge plasma • Tsui: Tritium recovery by thermal oxidation • Removed as D2O, T2O and CO2 • Rarely PFCs show damage due O2 • For ITER, 90% T-removal in 1 day in 21kPa O2  • West: reduced frequency of Carbon wall conditioning due to divertor cryo-pumping • Pitts: • ITER QDT = 10 pulse expecting to use ~50g T at 20% retention, 1 kg in-vessel T-limit reached in ~100 discharges for major shut-down! • 0.5 MJm-2DWELM~ 1 MJ ~0.3% of stored energy at ITER divertor targets to avoid material damage. On JET, typical ELM is 0.8MJ, 8% of stored energy. ELM mitigation required! • Dust: why: tritium retention on C, radioactivity on W, explosion hazard on Be, core contamination. Hot topic for ITER • Smirnov: modelování dynamiky prachu DustT (r=1mm,Q=104e,v=300m/s) a jeho vlivu na uvolňování C do plazmatu. • Rudakov: experimental observations with Thomson, fast visible camera. size>5ms, v<300m/s

  5. General topics • J. Lindl: review on ICF in NIF. Moc pěkné, pro Mlynare. • Janeshitz: ITER design review • how ITER organization works • Treating issues for design changes • VanDam: Scientific challenge for burning plasmas (pro Mlynare), detailed investigation of new problems: • a, self-heating yields non-linear coupling with others => instability? • too slow toroidal rotation • ELMs>10MJ (=1% of Epedestal) damage divertor • PFCs • nuclear environment (issue for diagnostics) • low T-worldwide supply (gold/kg is 1000x cheaper!) => T-breeding necessary within years E:\Users\Common\Meetings\APS07FloridaHoracekSummary

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