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SUMMARY OF H-MODE/L-MODE DB SESSIONS

SUMMARY OF H-MODE/L-MODE DB SESSIONS.

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SUMMARY OF H-MODE/L-MODE DB SESSIONS

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  1. SUMMARY OF H-MODE/L-MODE DB SESSIONS • Presentations- Confinement near operational boundaries (OK)- Status of H-mode DB (KT)- Status of AUG confinement data (FR)- Impact of rotation on Hybrid data in DIII-D (JD)- JET 2006-7 dimensionless confinement scaling studies (DM)- Status of L-mode database (FI)- Dataset from HL-2A (ZC)- Statistical studies for the scaling of confinement (FI)- On the ratio between L-mode and H-mode confinement (OK) • Discussion of OK’s analyses • Analyses of Hybrid dataset • Discussion of the future of the confinement db wg • Non-linear H-mode/L-mode scalings in PPCF (OK) • H-mode WS paper on Hybrid regime (KT)

  2. L-mode data base • The DWDIA and DWMHD data corruption problems have been solved • The details of the WDIA and WMHD data corruption problems have been identified and can now be solved • New data from HL-2A and AUG • Current version is v3.2 • The condition of this version is being analysed

  3. H-mode data base • NF paper on DB3 has been publishedNucl. Fusion 47 (2007) 147-174 (DM). • New version of H-mode db DB4v4 with Hybrid data from AUG, DIII-D, JET, JT-60U and NSTX

  4. JD showed the Impact of Rotation on Hybrid Discharges in DIII-D- Changes in rotation from no rotation to large co-rotation leads to increased energy confinement (over 50% in some cases).- Effect of changes in torque are seen across the entire radial profile. • DM showed results from the JET 2006-7 dimensionless confinement scaling studies- beta degradation seen in Hybrid beta scans- density peaking increases with decreasing nu star • OJK presented the results of non-linear regression analysesFrom ELMy H-mode std set of DB4v4ln(Wth) = ln(290) + 1.40ln(Ip) + 0.10ln(Bt) + 0.25ln(PL) + 1.16ln(R) + 0.22ln(ka) + 1.09ln(Fsh) + 0.49ln(a/R) − 1.34ln2(a/R) + 0.09ln(n/nGr) − 0.24ln2(n/nGr) [MJ]

  5. Future of Global Confinement WG • H-mode WS Topics- Comparison of Hybrid data from different machines. List differences/similarities.- discussion of the definition of Hybrid regimes- Compare Hybrid data trends with standard H-mode scaling trends.- Influence of MHD (NTM..)- power dependence • Study beta dependence in H-mode (L-mode)- proximity to beta limit – revise std. dataset criteria- identifiers on beta scan data in the db- influence of shape- degradation in Wped • Study effects of rotation/torque- SK to provide definitions- Contact the specialists

  6. Actions • 1 paragraph describing the Hybrid data in the data base (FR, JD, DM, HT, SK) asap • Updated versions of Hybrid data contributions (FR, JD, DM, HT, SK) asap • New version of DB4v4 (KT) asap • Draft of H-mode ws abstract (KT) 25 May • Submit abstract (KT) 31May • Distribute definitions of rotation/torque etc variables (SK) • Provide data for the new variables (All) next meeting • Distribute workplan for PPCF paper on non-linear regressions (OJK) • Distribute draft of PPCF paper (OJK) • NUstar scans from C-Mod - MG • JET H-mode data - December (DM)

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