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Journal Articles

The 2008 public release of the international multi-tokamak confinement profile database

Roach, C. M.*; Walters, M.*; Budny, R. V.*; Imbeaux, F.*; Fredian, T. W.*; Greenwald, M.*; Stillerman, J. A.*; Alexander, D. A.*; Carlsson, J.*; Cary, J. R.*; et al.

Nuclear Fusion, 48(12), p.125001_1 - 125001_19, 2008/12

 Times Cited Count:31 Percentile:26.98(Physics, Fluids & Plasmas)

This paper documents the public release PR08 of the International Tokamak Physics Activity profile database, which should be of particular interest to the magnetic confinement fusion community. Data from a wide variety of interesting discharges from many of the world's leading tokamak experiments are now made available in PR08, which also includes predictive simulations of an initial set of operating scenarios for ITER. In this paper we describe the discharges that have been included and the tools that are available to the reader who is interested in accessing and working with the data.

Journal Articles

Progress in the ITER physics basis, 2; Plasma confinement and transport

Doyle, E. J.*; Houlberg, W. A.*; Kamada, Yutaka; Mukhovatov, V.*; Osborne, T. H.*; Polevoi, A.*; Bateman, G.*; Connor, J. W.*; Cordey, J. G.*; Fujita, Takaaki; et al.

Nuclear Fusion, 47(6), p.S18 - S127, 2007/06

no abstracts in English

Journal Articles

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

McDonald, D. C.*; Cordey, J. G.*; Thomsen, K.*; Kardaun, O. J. W. F.*; Snipes, J. A.*; Greenwald, M.*; Sugiyama, L.*; Ryter, F.*; Kus, A.*; Stober, J.*; et al.

Nuclear Fusion, 47(3), p.147 - 174, 2007/03

 Times Cited Count:44 Percentile:29.82(Physics, Fluids & Plasmas)

This paper describes the updates to and analysis of the International Tokamak Physics Activity (ITPA) Global H-node 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. A wide range of physics studies has been performed on DB3 with particular progress made in the separation of core and edge behavior, dimensionless parameter analyses and the comparison of the database with one-dimensional transport code. 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.

Journal Articles

The Role of aspect ratio and beta in H-mode confinement scalings

Kaye, S. M.*; Valovic, M.*; Chudnovskiy, A.*; Cordey, J. G.*; McDonald, D.*; Meakins, A.*; Thomsen, K.*; Akers, R.*; Bracco, G.*; Brickley, C.*; et al.

Plasma Physics and Controlled Fusion, 48(5A), p.A429 - A438, 2006/05

 Times Cited Count:13 Percentile:44.28(Physics, Fluids & Plasmas)

The effects of aspect ratio and beta on confinement scaling are studied with the use of the H-mode database extended by the low aspect ratio data from NSTX and MAST. Various statistical methods are applied. Development of scalings using engineering parameters as predictor variables results in the inverse-aspect-ratio scaling with the range from 0.38 to 1.29. The transformation of these scalings to physics variables results in an unfavorouble dependence of the normalized energy confinement time on beta. There is a strong correlation between the inverse aspect ratio and beta, and this makes scalings based on physics variables imprecise.

Journal Articles

Scaling of the energy confinement time with $$beta$$ and collisionality approaching ITER conditions

Cordey, J. G.*; Thomsen, K.*; Chudnovskiy, A.*; Kardaun, O. J. W. F.*; Takizuka, Tomonori; Snipes, J. A.*; Greenwald, M.*; Sugiyama, L.*; Ryter, F.*; Kus, A.*; et al.

Nuclear Fusion, 45(9), p.1078 - 1084, 2005/09

 Times Cited Count:51 Percentile:84.74(Physics, Fluids & Plasmas)

The condition of the latest version of the ELMy H-mode database has been re-examined. It is shown that there is bias in the ordinary least squares regression for some of the variables. To address these shortcomings three different techniques are employed: (a)principal component regression, (b)an error in variables technique and (c)the selection of a better conditioned dataset with fewer variables. Scalings in terms of the dimensionless physics valiables, as well as the standard set of engineering variables, are derived. The new scalings give a very similar performance for existing scalings for ITER at the standard beta, but a much improvement performance at higher beta.

Journal Articles

ITER forecasts

Cordey, J. G.*; Takizuka, Tomonori; Miura, Yukitoshi; *; D.Boucher*; J.W.Connor*; Kardaun, O.*; Ryter, F.*; M.F.Turner*; A.Taroni*; et al.

Science, 275(5298), p.290 - 291, 1997/00

no abstracts in English

Journal Articles

Results from the ITER H-mode threshold database

Ryter, F.*; H-mode Database Working Group

Plasma Physics and Controlled Fusion, 38(8), p.1279 - 1282, 1996/08

 Times Cited Count:11 Percentile:40.85(Physics, Fluids & Plasmas)

no abstracts in English

Journal Articles

H mode power threshold database for ITER

Ryter, F.*;

Nuclear Fusion, 36(9), p.1217 - 1264, 1996/00

 Times Cited Count:114 Percentile:94.78(Physics, Fluids & Plasmas)

no abstracts in English

Journal Articles

ITER; Analysis of the H-mode confinement and threshold databases

Kardaun, O.*; Ryter, F.*; Stroth, U.*; Kus, A.*; Deboo, J. C.*; Schissel, D. P.*; Bramson, G.*; Carlstrom, T. N.*; Thomsen, K.*; Campbell, D. J.*; et al.

Plasma Physics and Controlled Nuclear Fusion Research 1992, Vol.3, p.251 - 270, 1993/00

no abstracts in English

Journal Articles

Global energy confinement H-mode database for ITER

Christiansen, J. P.*; Cordey, J. G.*; Thomsen, K.*; A.Tanga*; Deboo, J. C.*; Schissel, D. P.*; T.S.Taylor*; Kardaun, O.*; F.Wagner*; Ryter, F.*; et al.

Nuclear Fusion, 32(2), p.291 - 338, 1992/00

 Times Cited Count:71 Percentile:89.17(Physics, Fluids & Plasmas)

no abstracts in English

Oral presentation

Density peaking in He plasmas

Angioni, C.*; Weisen, H.*; Zabolotsky, A.*; Ryter, F.*; Takenaga, Hidenobu

no journal, , 

In order to contribute to the consideration that He plasmas will be used for the initial operation phase in ITER, density profiles are investigated in He plasmas on multi machines such as TCV, JET, AUG and JT-60U. He edge neutrals penetrate much less than H edge neutrals, because ratio CX to ionization rate coefficients is about one order of magnitude smaller in He. Despite of this, no significative difference in the density profiles is observed between pairs of similar D and He plasmas in TCV, JET, AUG, and JT-60U, in both L- and H-mode. This result provides further confirmation that neutral penetration (particle source/NBI fuelling) is not the main ingredient leading to peaked density profiles. AUG and JET He plasmas in H-mode have been included in the AUG/JET/C-Mod density peaking database. The subset of He plasmas exhibits the same collisionality dependence as the D plasmas, although there are no enough data to perform statistics though.

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