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TC-11 He transport in hybrid, AT, ITB scenarios

TC-11 He transport in hybrid, AT, ITB scenarios. Status and call for contributions Henri Weisen, CRPP and EFDA-JET henri.weisen@epfl.ch. Status. Call for supplying historic and recent data was issued after transport TG meeting in Milano, autumn 2008

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TC-11 He transport in hybrid, AT, ITB scenarios

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  1. TC-11 He transport in hybrid, AT, ITB scenarios Status and call for contributions Henri Weisen, CRPP and EFDA-JET henri.weisen@epfl.ch

  2. Status • Call for supplying historic and recent data was issued after transport TG meeting in Milano, autumn 2008 • Response from JET: Historic He CXRS was poorly calibrated, not suitable for profile studies. Recent data to become available soon • He spectra inherently difficult to interpret: parasitic lines and strong plume effect for usual horizontal CXRS view • No response received from other ITPA partners • We believe historical data exist at least at DIII-D and at JT-60U C. Angioni, ITPA T&C, PPPL, 5-7.10 2009

  3. Positive shear H-mode m-3 ITB m-3 Why He transport? • Important for ash removal • Both diffusion and convection important • No systematic investigations or database yet • Some, not all, existing published data suggest convection may be outward (hollow He profiles) in H-mode, or inward convection weaker than for C, ne in ITB. Example: JT-60 • Hollow He profiles favourable, equivalent to a main plasma contribution to He compression and hence pumping. • Peaked He unfavourable (dilute fuel in core) • Need He transport in various scenarios to better predict fusion performance From ITER Phys. Basis 2007, page s57 C. Angioni, ITPA T&C, PPPL, 5-7.10 2009

  4. What data? • He present in % range (like He ash in ITER) • Hybrid, AT, ITB, ‘ordinary H-modes’ also welcomesome L-modes useful for physics A) Stationary profile data • Need nHe(r) in addition to the usual profiles and scalars in the profile database, typically Te,Ti, ne, (nc),q,GHe (if He beams). B) D,V from modulated He or puffs, if available • How? • Designate volunteer to dig into historic data, but check soundness of data. Contact spokesperson… • Parasitic experiments with gas injection puffs into D • Contact henri.weisen@epfl.ch , thanks! C. Angioni, ITPA T&C, PPPL, 5-7.10 2009

  5. Apparent turbulence anisotropy • Apparent (kq, kr) anisotropy in the experiments is due to Doppler instrumental integration domain GYRO #39596 r/a=0.7 log10(|dn(kr,kq)/n|2) Doppler kq-spectrum Fast-sweeping kr-spectrum A. Casati et al., PRL 2009 19

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