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ITER reflectometry diagnostics operation limitations caused by strong back and small angle scattering E.Gusakov 1 , S. Heuraux 2 , A. Popov 1 1 Ioffe Institute, St.Petersburg, Russia 2 IJL, Nancy-Universite CNRS UMR 7198, F54506 Vandoeuvre CEDEX, France. Introduction.
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operation limitations caused by
strong back and small angle scattering
E.Gusakov1, S. Heuraux2, A. Popov1
1Ioffe Institute, St.Petersburg, Russia
2 IJL, Nancy-Universite CNRS UMR 7198, F54506 Vandoeuvre CEDEX, France
[*] G. Vayakis, C.I. Walker, F. Clairet et al 2006 Nucl. Fusion46 S836-S845
(b) Absolutely flat density profile(dashed) [*]
relativistic corrections to the plasma
permittivity are neededScenarios of ITER discharge
[*] A R Polevoi, M Shimiada et al 2005 Nucl. Fusion45 1451
[**]G.J. Kramer, R. Nazikian, E.J. Valeo, et al 2006 Nucl. Fusion46 S846
[*] H Bindslev 1992 Plasma Phys. Control. Fusion 34 1093
The expression of the phase RMS for the linear profile of
the wave vector squared and the homogeneous turbulence:
the linear analysis
is not valid
CCF takes the form:
E.Z. Gusakov, A.Yu. Popov Plasma Phys. Control. Fusion 44 (2002) 2327–2337
3 · 10-2 (▲) and 5 · 10-2 (◄).
xc = 60 cm; fj = 57.69 GHz
G Leclert, S Heuraux, E Z Gusakov et al. Plasma Phys. Control. Fusion 48 (2006) 1389
Reflectometer correlation length versus
density perturbation level δn/n.
Reflectometer correlation length versus turbulence
correlation length for givendensity perturbation level δn/n.
E.Z.Gusakov, A.Yu.Popov Plasma Phys. Control. Fusion46, 9, 2004, 1393-1408
1D modeling for ITER conditions. Plasma density (violet), electric field of the wave (blue)
Dependence of transmission on the fluctuation amplitude .
Analytical formula (dashed green line), modeling (solid red line)
Amplitude decreasing ~Sii
Plasma density (red),
electric field of the wave (blue)
Amplitude increasing due
to “Airy” behaviornear Bragg resonance point
For O-mode reflectometry at the linear density profile the criterion reads as
O-mode probing from the low magnetic field side for
modestly flat density profile for frequencies 85 GHz and 90 GHz
X-mode probing from high and low magnetic field side for modestly flat density profile for frequencies 40, 45 GHz and 180,190 GHz
X-mode probing from high and low magnetic field side for absolutely flat density for frequencies40, 45 GHz and 170,175 GHz
The analyzed strong BBS phenomena may occur in
ITER at the level of turbulent density fluctuations of less than 1% routinely observed in the present day tokamaks.