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TC-11 He transport in hybrid, AT, ITB scenarios. Status and call for contributions Henri Weisen, CRPP and EFDA-JET [email protected]. Status. Call for supplying historic and recent data was issued after transport TG meeting in Milano, autumn 2008 - PowerPoint PPT Presentation
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Report on status of TC-10 & 11 joint activities ITPA T&C Group meeting, PPPL, 5-7.10.2009
TC-11 He transport in hybrid, AT, ITB scenarios
Status and call for contributions
Henri Weisen, CRPP and [email protected]
Report on status of TC-10 & -11 joint activities C. Angioni, ITPA T&C, PPPL, 5-7.10 2009
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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
Report on status of TC-10 & -11 joint activities C. Angioni, ITPA T&C, PPPL, 5-7.10 2009
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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
m-3
m-3
ITB
Positive shear H-mode
From ITER Phys. Basis 2007, page s57
Report on status of TC-10 & -11 joint activities C. Angioni, ITPA T&C, PPPL, 5-7.10 2009
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What data? He present in % range (like He ash in ITER) Hybrid, AT, ITB, ‘ordinary H-modes’ also welcome
some 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,He (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 [email protected] , thanks!
Report on status of TC-10 & 11 joint activities ITPA T&C Group meeting, PPPL, 5-7.10.2009
Apparent (k, kr) anisotropy in the experiments is due to Doppler instrumental integration domain
max,k
0
S
2
,kkn
ndkk rr
-1
1-
cm 1
cm 0
S2
,
kkn
ndkk rr Doppler k-
spectrumFast-sweeping kr-spectrum
log10(|n(kr,k)/n|2)
GYRO #39596 r/a=0.7
A. Casati et al., PRL 2009
0.14.0for 32
skkk
n
n
19
Apparent turbulence anisotropy
