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Insights on Iota/Shear Effects: Experimental Observations and Homework from 5th CWGM

The 5th Conference on Iota/Shear Effects, held at the Institut für Plasmaforschung, Universität Stuttgart from July 6-8, 2009, focused on experimental observations and theoretical insights. Key findings include the dependency of magnetic island healing on various parameters, effective diffusivities altered by magnetic resonance movements, and the role of electric fields in the dynamic iota/shear context. Participants presented several homework assignments covering topics from electric field measurements to theoretical studies relating to magnetic island dynamics and their healing processes.

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Insights on Iota/Shear Effects: Experimental Observations and Homework from 5th CWGM

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  1. Data Access (Dinklage)

  2. Iota/shear effects session Outline Observation Homework 5th CWGM July 6-8 2009 Institut für Plasmaforschung Universität Stuttgart Iota/shear effects session Summary of session 1. Experimental observations 2. Homework Keywords - Healing - Effective diffusivities - Electric field

  3. Iota/shear effects session Outline Observation Homework 5th CWGM July 6-8 2009 Institut für Plasmaforschung Universität Stuttgart 1.Experimental observations - Healing of magnetic island depends on b, n and (may be) Er and petc. - Effective diffusivities modified at moving location of magnetic resonances in dynamic i scan - Electric field CERC (Er > 0), LHD (Er < 0) Doppler reflectometer spike of Er towards positive during dynamic i scan

  4. Iota/shear effects session Outline Observation Homework 5th CWGM July 6-8 2009 Institut für Plasmaforschung Universität Stuttgart 2.Homework Y. Narushima Measurement of ErTi in LHD F. Castejón Magaña Theoretical study of relationship between Er and healing (CERC, L-H transition) D. López-Bruna y T. Estrada Analysis of Doppler reflectometer in dynamic control of iota/shear experiment in TJ-II ! Hasta pronto! at 17th ISHW

  5. “expert” group (on use of, linkage to PDB) • Directory structure : H.Funaba, A.Kus • Equilibrium DB in PDB • Equilibrium provider : S.Sakakibara, J.Geiger, F.Castejon • documentation, reading routine (wrt regulations@IPP) • resolution (higher required for stability calc.) • Different versioning • Definition of D_M (ex.) • Mapping • NC DB in PDB (-> benchmark of NC module with 2D Ufile and same equilibrium) • DGN/LHD (LHD) • DKES (W7-AS/X) • DKES (TJ-II) • Mutual use of NC DB (interface : M.Sato, M.Yokoyama, Turkin next week) • Users: Let me know colleagues around you. • (transport codes) M.Sato, Y.Turkin, D.Lopez-Bruna, M.Yokoyama • (MHD, GK) Narushima, Guttenfelder,,,,,,,,,

  6. Oct. 2010 23rd IAEA-FEC (MANYjoint papers) Oct. 2007 ITC/ISHW @NIFS (6 joint papers) Oct. 2007 3rd CWGM @NIFS Nov.2004 20th IAEA-FEC ISS04 2005 Profile DB 2002 Confinement Database under auspices IEA SEC Oct. 2009 6th CWGM @PPPL Sep. 2006 1st CWGM @Kyoto U. • Oct. 2006 • 21st IAEA-FEC • (2 joint papers) • CERC (PDB) • Confinement DB (CDB) Oct. 2009 ISHW @PPPL ISS95 Jul. 2009 5th CWGM @Stuttgart Jun. 2007 2nd CWGM @IPP-Greifswald Oct. 2008 22nd IAEA-FEC (4 joint papers) Oct. 2008 4th CWGM @CIEMAT

  7. Specific Goals Achieved (5th CWGM) • Collaboration in/beyond each session • mutual understanding (ex., commonality/difference) • seed for joint experiments, analysis, papers • Presentation files : upload to web • Joint papers for ISHW2009/IAEA-FEC(2010) • H mode (Hirsch) • Data Access (Funaba) • ~advertisement of CWGM (call for users of CDB, PDB) • Island Healing (Narushima, Castejon in collab. dynamic island study in TJ-II) • Data mining (Pretty) • Turbulence (Mirko) • Equilibrium Code benchmarking (ECB) : status report being prepared by Drevlak • 6th CWGM (before or after ISHW, depends on the situation) : Progress report !  IAEA-FEC • Brief report of CWGM activity to Stellarator News

  8. 5thCWGM (@IPF Stuttgart U., 2009.7.6-8) • H mode & ELMs • M.Hirsch • T.Akiyama • T.Estrada • T.Mizuuchi(TV) • survey of H mode observation • Role of iota, rationals • Turbulent Studies (exp.) • U.Stroth • M.Endler (TV) K.Tanaka LHD, HSX, TJ-II • M.Ramisch (particle transport) • G.Berkenmeier • P.Manz • Configuration effects (eg., normal & geodesic curvature, local magnetic shear) on turbulence , Collection of • Comparative study (SH-TOK) • 3D Effects • Y.Suzuki • C.Wiegmann • Equil. “3D in tokamaks, RFP” • Outreach to tokamak commun. • “added value” , impact of island, edge transport, • Equil. Code Benchmarking • Y.Suzuki • A.Reiman • Step-by-step • Verification-> validation • DataAccess • A.Dinklage • H.Funaba • F.Castejon • E.Ascasibar • PDB • Equil. data on GRID • Discussions on High beta data in ISS04 • MHD & High Beta • S.Sakakibara • A.Weller • S.Ohdachi • Y.Suzuki • S.Yamamoto • High-beta shots to PDB (W7-AS, LHD) • Data access via WebService • Data mining • Transport Code • (Usage of PDB) • M.Yokoyama • J.Geiger • Usage of PDB • Required equipment (ex., NC, Equil.) • Small Expert Group • Effects of iota/shear • Y.Narushima • F.Castejon • E.Ascasibar • island dynamics, impact of Er • dynamic iota/shear scan • impact of iota/shear on P, Te profile

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