Recent progress on the development and analysis of the ITPA global H-mode confinement database

This paper describes the updates to and analysis of the International Tokamak Physics Activity (ITPA) Global H-Mode Confinement Database version 3 (DB3) over the period 1994–2004. Global data, for the energy confinement time and its controlling parameters, have now been collected from 18 machines of different sizes and shapes: ASDEX, ASDEX Upgrade, C-Mod, COMPASS-D, DIII-D, JET, JFT-2M, JT-60U, MAST, NSTX, PBX-M, PDX, START, T-10, TCV, TdeV, TFTR and TUMAN-3M. The database now contains 10382 data entries from 3762 plasma discharges, including data from deuterium–tritium experiments, low-aspect ratio plasmas, dimensionless parameter experiments and plasmas. DB3 also contains an increased amount of data from a range of diverted machines and further data at high triangularity, high density and high current. A wide range of physics studies has been performed on DB3 with particular progress made in the separation of core and edge behaviour, dimensionless parameter analyses and the comparison of the database with one-dimensional transport codes. The errors in the physics variables of the database have also been studied and this has led to the use of errors in variables fits. A key aim of the database has always been to provide a basis for estimating the energy confinement properties of next step machines such as ITER, and so the impact of the database and its analysis on such machines is also discussed.

[1]  Peter A. Politzer,et al.  Feasibility Study of a Compact Ignition Tokamak Based upon GyroBohm Scaling Physics , 2003 .

[2]  M. R. Wade,et al.  Effect of rotation on H-mode transport in DIII–D via changes in the E×B velocity shear , 2002 .

[3]  T. C. Luce,et al.  Scaling of heat transport with beta in the DIII-D tokamak , 1998 .

[4]  O. J. W. F. Kardaun,et al.  Analysis of the ITER H-mode confinement database , 1993 .

[5]  C. Giroud,et al.  The beta scaling of energy confinement in ELMy H-modes in JET , 2004 .

[6]  M. Sugihara,et al.  Comparison of ITER performance predicted by semi-empirical and theory-based transport models , 2003 .

[7]  A. Manini,et al.  Profile stiffness and global confinement , 2004 .

[8]  R. D. Deranian,et al.  Progress in quantifying the edge physics of the H mode regime in DIII-D , 2000 .

[9]  J. G. Cordey,et al.  A two-term model of the confinement in Elmy H-modes using the global confinement and pedestal databases , 2003 .

[10]  G. Bateman,et al.  The tokamak Monte Carlo fast ion module NUBEAM in the National Transport Code Collaboration library , 2004 .

[11]  Y Kamada,et al.  Non-dimensional transport study on ELMy H-mode plasmas in JT-60U , 2000 .

[12]  S. Wolfe,et al.  A new look at density limits in tokamaks , 1988 .

[13]  F. G. Rimini,et al.  D-T fusion with ion cyclotron resonance heating in the JET tokamak , 1998 .

[14]  Jeff M. Candy,et al.  Beta scaling of transport on the DIII-D Tokamak: Is transport electrostatic or electromagnetic? , 2004 .

[15]  G. M. D. Hogeweij,et al.  The International Multi-Tokamak Profile Database , 2000 .

[16]  O. J. W. F. Kardaun,et al.  Interval estimate of the global energy confinement time during ELMy H-mode in ITER-FEAT, based on the international multi-tokamak ITERH.DB3 dataset , 2002 .

[17]  J. Weiland,et al.  Predictive transport simulations of JET L and H mode gyro-radius scaling experiments , 1998 .

[18]  Waltz,et al.  Magnetic-field scaling of dimensionally similar tokamak discharges. , 1990, Physical review letters.

[19]  Y. R. Martin,et al.  Latest Results from the ITER H-Mode Confinement and Threshold Databases , 1999 .

[20]  T. C. Luce,et al.  Experimental constraints on transport from dimensionless parameter scaling studies , 1998 .

[21]  Martin Greenwald,et al.  Experimental validation of similarity in high-temperature plasmas , 2001 .

[22]  B. Coppi,et al.  Model for particle transport in high-density plasmas , 1981 .

[23]  Tomonori Takizuka.  AN OFFSET NONLINEAR SCALING FOR ELMY H-MODE CONFINEMENT , 1998 .

[24]  Roger Barlow,et al.  Statistics : a guide to the use of statistical methods in thephysical sciences , 1989 .

[25]  Wagner,et al.  Improved confinement with counter neutral injection into ASDEX. , 1988, Physical review letters.

[26]  S. J. Wukitch,et al.  Measurements of the high confinement mode pedestal region on Alcator C-Mod , 1998 .

[27]  N. J. Conway,et al.  Energy and particle confinement in MAST , 2005 .

[28]  E. Asp,et al.  JETTO simulations of Te/Ti effects on plasma confinement , 2005 .

[29]  Y. R. Martin,et al.  Scaling of the energy confinement time with β and collisionality approaching ITER conditions , 2005 .

[30]  C. M. Greenfield,et al.  HIGH PERFORMANCE H-MODE PLASMAS AT DENSITIES ABOVE THE GREENWALD LIMIT , 2002 .

[31]  K. Matsuda,et al.  Ray tracing study of the electron cyclotron current drive in DIII-D using 60 GHz , 1989 .

[32]  Arnold H. Kritz,et al.  Integrated predictive modelling simulations of burning plasma experiment designs , 2003 .

[33]  F. C. Schüller,et al.  Electron thermal transport in a scan of the effective ion charge in the RTP tokamak , 1997 .

[34]  Y. Demers,et al.  Dependence of the L-H transition on separatrix-wall gaps on TdeV , 1999 .

[35]  P. J. Paris,et al.  Energy Confinement and MHD Activity in Shaped TCV Plasmas with Localized Electron Cyclotron Heating , 1999 .

[36]  K. Itami,et al.  Improved confinement of JT-60U plasmas , 1995 .

[37]  S. S. Medley,et al.  TFTR confinement results , 1986 .

[38]  A. Taroni,et al.  CORRIGENDUM: The influence of isotope mass, edge magnetic shear and input power on high density ELMy H modes in JET , 1999 .

[39]  O. J. W. F. Kardaun,et al.  Interval estimation of global H-mode energy confinement in ITER , 1999 .

[40]  G. Fishpool,et al.  Overview of ITER physics deuterium-tritium experiments in JET , 1999 .

[41]  O. Naito,et al.  Fusion Plasma Performance and Confinement Studies on JT-60 and JT-60U , 2002 .

[42]  G. Saibene,et al.  Energy confinement in steady-state ELMy H-modes in JET , 2002 .

[43]  Jerry Hughes,et al.  High-resolution edge Thomson scattering measurements on the Alcator C-Mod tokamak , 2000 .

[44]  P. J. Lomas,et al.  Experimental Tests of Confinement Scale Invariance on JET, DIID, ASDEX Upgrade and CMOD , 1999 .

[45]  W. Kerner,et al.  Plasma confinement in JET H?mode plasmas with H, D, DT and T isotopes , 1999 .

[46]  Tomonori Takizuka,et al.  Reduction of L-H transition threshold power under the W-shaped pumped divertor geometry in JT-60U , 2000 .

[47]  Hiroshi Shirai,et al.  Degradation of energy and particle confinement in high-density ELMy H-mode plasmas on JT-60U , 1997 .

[48]  M. Keilhacker,et al.  JET results with the new pumped divertor and implications for ITER , 1995 .

[49]  O. Kardaun.  ITER: Analysis of the H-Mode Confinement and Threshold Databases , 1993 .

[50]  J. Kinsey,et al.  Predicting core and edge transport barriers in tokamaks using the GLF23 drift-wave transport model , 2005 .

[51]  Conway,et al.  H-Mode operation in the START spherical tokamak , 2000, Physical review letters.

[52]  Hiroshi Shirai,et al.  Thermal energy confinement of high-triangularity ELMy H-mode plasmas in JT-60U , 2002 .

[53]  T. C. Luce,et al.  Scaling of heat transport with collisionality , 1999 .

[54]  Lao,et al.  Regime of very high confinement in the boronized DIII-D tokamak. , 1991, Physical review letters.

[55]  Takakazu Takizuka,et al.  Next step tokamak physics: Confinement-oriented global database analysis , 2000 .

[56]  F. G. Rimini,et al.  Observation of Alpha Heating in JET DT Plasmas , 1998 .

[57]  A. Kritz,et al.  Characteristics of the H-mode pedestal and extrapolation to ITER , 2002 .

[58]  E. D. Fredrickson,et al.  H-mode pedestal, ELM and power threshold studies in NSTX , 2005 .

[59]  F. G. Rimini,et al.  Core and edge confinement studies with different heating methods in JET , 2002 .

[60]  K. Shinohara,et al.  The difference in H-mode confinement between co- and co + counter-neutral beam heating in the JFT-2M tokamak , 1998 .

[61]  Brian Labombard,et al.  Observations and empirical scalings of the high-confinement mode pedestal on Alcator C-Mod , 2002 .

[62]  Iter Confinement Database.  Energy confinement scaling and the extrapolation to ITER , 1997 .

[63]  Volker Dose,et al.  A Bayesian approach to the global confinement time scaling in W7-AS , 1996 .

[64]  ASDEX-Upgrade team,et al.  The H-Mode of ASDEX , 1989 .

[65]  J. G. Cordey,et al.  Development of a two-term model for the confinement in ELMy H-modes using the global confinement and pedestal databases , 2002 .

[66]  G. Fishpool,et al.  Studies in JET Divertors of Varied Geometry II: Impurity Seeded Plasmas , 1999 .

[67]  E. Joffrin,et al.  Recent Progress on JET Towards the ITER Reference Mode of Operation at High Density. Invited Paper , 2001 .

[68]  Eric Gauthier,et al.  Studies in JET divertors of varied geometry. I: Non-seeded plasma operation , 1999 .

[69]  G. V. Pereverzew,et al.  ASTRA. An Automatic System for Transport Analysis in a Tokamak. , 1991 .

[70]  M. J. Mantsinen,et al.  The edge operational space in JET , 1999 .

[71]  Joseph A. Snipes,et al.  Latest results on the H-mode threshold using the international H-mode threshold database , 2000 .

[72]  Steve C. Chiu,et al.  Nondimensional transport scaling in DIII‐D: Bohm versus gyro‐Bohm resolved , 1995 .

[73]  Tomonori Takizuka,et al.  Origin of the various beta dependences of ELMy H-mode confinement properties , 2006 .

[74]  N. J. Conway,et al.  Transition dynamics and confinement scaling in COMPASS-D H mode plasmas , 2001 .

[75]  L. Lao,et al.  Reconstruction of current profile parameters and plasma shapes in tokamaks , 1985 .

[76]  M. R. Wade,et al.  Dependence of Heat and Particle Transport on the Ratio of the Ion and Electron Temperatures , 1999 .

[77]  Martin Greenwald,et al.  Transport phenomena in Alcator C-Mod H-modes , 1998 .

[78]  J. W. Connor,et al.  Scaling laws for plasma confinement , 1977 .

[79]  Hiroshi Shirai,et al.  Edge-core relationship of ELMy H-mode plasmas in JT-60U , 2002 .

[80]  T. W. Petrie,et al.  Gas puff fueled H-mode discharges with good energy confinement above the Greenwald density limit on DIII-D , 2001 .

[81]  F. Ryter,et al.  SPECIAL TOPIC: Global energy confinement H-mode database for ITER , 1992 .

[82]  C. D. Challis,et al.  Transport and confinement in the Mega Ampère Spherical Tokamak (MAST) plasma , 2003 .

[83]  L. Horton,et al.  Bulk ion heating with ICRH in JET DT plasmas , 1999 .

[84]  Jet Team,et al.  Pellet fuelling and ELMy H?mode physics in JET , 2001 .

[85]  L. L. Lao,et al.  Equilibrium analysis of current profiles in tokamaks , 1990 .

[86]  M. Sugihara,et al.  Understanding of H mode pedestal characteristics using the multimachine pedestal database , 2001 .

[87]  M. Gryaznevich,et al.  Achievement of Record β in the START Spherical Tokamak , 1998 .

[88]  Mori,et al.  Density peaking in the JFT-2M tokamak plasma with counter neutral-beam injection. , 1991, Physical review letters.

[89]  Y. R. Martin,et al.  The role of aspect ratio and beta in H-mode confinement scalings , 2005 .

[90]  Sergey V. Lebedev,et al.  Ohmic H-mode studies in TUMAN-3 , 1994 .

[91]  W. Treutterer,et al.  Optimization of confinement, stability and power exhaust of the ELMy H-mode in ASDEX Upgrade , 2001 .

[92]  Olivier Sauter,et al.  Long timescale density peaking in JET , 2002 .

[93]  A. N. Romannikov,et al.  Boronization of Russian tokamaks from carborane precursors , 1995 .

[94]  A. Murari,et al.  ELMy H-modes in JET helium-4 plasmas , 2004 .

[95]  M Keilhacker.  Fusion physics progress on the Joint European Torus (JET) , 1999 .

[96]  T. Fujita,et al.  Multi-machine transport analysis of hybrid discharges from the ITPA profile database , 2005 .

[97]  David P. Schissel,et al.  ITER H mode confinement database update , 1994 .

[98]  R. J. Groebner,et al.  Critical edge parameters for H-mode transition in DIII-D , 1997 .

[99]  T. C. Luce,et al.  Application of dimensionless parameter scaling techniques to the design and interpretation of magnetic fusion experiments , 2008 .

[100]  L. L. Lao,et al.  Dependence of H-mode pedestal parameters on plasma magnetic geometry , 2002 .

[101]  Brian Labombard,et al.  Edge transport barrier phenomena in Alcator C-Mod , 1999 .

[102]  Tomonori Takizuka,et al.  Confinement degradation with beta for ELMy H-mode plasmas in JT-60U tokamak , 2006 .

[103]  N. Kirneva,et al.  Investigation of the H-mode during ECRH in the T-10 tokamak , 2000 .

[104]  J. P. Christiansen,et al.  β scaling of confinement , 1998 .