1/5 D. C. McDonald et al, Status of the ITPA paper “Recent progress of the ITPA global H-mode confinement and pedestal databases”, Kyoto, 18-20th Apr 2005.

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Presentation transcript:

1/5 D. C. McDonald et al, Status of the ITPA paper “Recent progress of the ITPA global H-mode confinement and pedestal databases”, Kyoto, 18-20th Apr 2005 Status of the ITPA paper “Recent progress of the ITPA global H-mode confinement and pedestal databases” Aim of paper: To provide a single reference for users who wish to use DB3v13 or the scalings derived from it – Review data added since DB2 – Review subsets and fitting methods used in recent years – Summarise available scalings and give recommended ones Key issues concerning the whole ITPA group – Completion of tokamak descriptions – Reaching a consensus on approved scalings for one and two term models D C McDonald, J G Cordey, K Thomsen, O Kardaun,....

2/5 D. C. McDonald et al, Status of the ITPA paper “Recent progress of the ITPA global H-mode confinement and pedestal databases”, Kyoto, 18-20th Apr 2005 Section 3: DB3v13 datasets 4 main datasets and weightings Extended standard set ( IAE2004S = 1 ) Non-Ohmic D set ( DB3DONLY = 1 ) ITER-like ( IAE2004S = 1 ) Pedestal set ( IAE2004S = 1, with pedestal data ) Review of errors in the parameters Condition of datasets No real issues

3/5 D. C. McDonald et al, Status of the ITPA paper “Recent progress of the ITPA global H-mode confinement and pedestal databases”, Kyoto, 18-20th Apr 2005 Section 4: Power law scalings of  E Ordinary least squares Errors in variables Principal components Pantula method PEP model (just reference) Dimensionless parameters Methods for applying Kadomstev constraints More restricted models (g-Bohm, ES) Effect of ELM Type Do small (Type III) ELMs fit the same scalings? No real issues

4/5 D. C. McDonald et al, Status of the ITPA paper “Recent progress of the ITPA global H-mode confinement and pedestal databases”, Kyoto, 18-20th Apr 2005 Section 5: Alternative models for  E Other variables Density peaking, shape, power peaking Two term models Core and pedestal models Interaction models No real issues

5/5 D. C. McDonald et al, Status of the ITPA paper “Recent progress of the ITPA global H-mode confinement and pedestal databases”, Kyoto, 18-20th Apr 2005 Section 6: Conclusion Recommended scalings Summary of scalings, together with a table showing recommended scalings Propose we include a set of scalings with a discussion of which to use and in which instance IPB98(y,2) (New dataset is still consistent with this using OLS) A one term EIV fit (preferred method as error analysis shows OLS is incorrect) A two term (although we show, following JGC’s paper, that pedestal data is very poorly conditioned, and so one terms are preferred) Discuss a beta independent scaling, as this scaling has been shown on the large ITER- like machines JET and DIII-D. However, cannot recommend as this is not consistent with the whole of DB3. Impact on ITER POPCON plots and brief description (not a main aim of the paper) Agree position on scalings