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Comments on Accessibility of Improved H-Mode in ITER

Comments on Accessibility of Improved H-Mode in ITER. V. Mukhovatov 12 th ITPA Transport Physics Group Meeting, 7-10 May 2007, Lausanne. Improved H-mode in AUG. P heat /P LH ratio criterion. Improved H-mode in AUG : P heat /P LH > 2. ITER:

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Comments on Accessibility of Improved H-Mode in ITER

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  1. Comments on Accessibility of Improved H-Mode in ITER V. Mukhovatov 12th ITPA Transport Physics Group Meeting, 7-10 May 2007, Lausanne

  2. Improved H-mode in AUG Pheat/PLH ratio criterion Improved H-mode in AUG: Pheat/PLH > 2 ITER: Pheat>(125-150)MW (D)Pheat>(100-120)MW (DT) Impossible in ITER D plasma Marginally possible in DT plasma PIPB Ch 2: (26) (27) (26): PLH=74MW (D); PLH =60MW (DT) (27): PLH=63MW (D); PLH =50MW (DT) B=5.3T, S=680m2, n20 = 0.8 L.Gionnoneet al PPCF 46 (2004) 835

  3. ASDEX Upgrade, all improved H-modes 1.6 1.4 1.2 H98(y,2) 1.0 ITER 0.8 0.6 Improved H-modes 1 2 3 bN ASDEX Upgrade: Improved H-mode βN criterion • A second dataset includes all“improved H-mode” discharges: • Early heating (some selected cases with late heating). • Stationary for > 0.5 s. • NOT just a selection of the best discharges. Minimum valuesrequired for DEMO Improved H-mode in AUG observed at βN > 2 G. Sips 21st IAEA Fusion Energy Conference, Chengdu, China, 16-21 October 2006

  4. Improved H-mode in ITER βN criterion βN = 160aW/(3RIV) W = Pnet  E, E98y2 Pnet- 0.69 βNW  Pnet  (H98y2E98y2)  H98y2(Pnet)0.31 Pnet (βN/ H98y2)3.23 Scenario 2:βN = 1.76; H98y2 =1; Pnet = 87MW; Pheat = 120MW (Pnet = Pheat – Pbrem – Psyn – Pline/3) Increase in βNfrom 1.76 to 2: Pnet = 130MW, Pheat = 180MW  Paux = 80MW; Pfus = 500MW Improved H-mode is marginally possible in DT plasma

  5. I=12.5MA q95=3.6 <ne>=9x1019 m-3 <ne>/nG=0.9 PL-H = 64MW He*/E=2 fBe=0.02 fAr as required for Psep<140MW HH=1.2 Scaling (9) with E β0J.G.Cordey et al NF 45(2005)1078 Operational Space of Improved Hybrid Regimes in ITER Limitations:(a) divertor requirement Psep<140MW (100MW) (G.Pacher et al PPCF 46 (2004 A257), and (b) capability of ITER blanket cooling system (Pfus ≤700MW for 60-300s depending on season) (ITER Technical Basis, IAEA,Vienna,2002) Optimistic scenario Results of ASTRA modeling

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