Test of TSUBe/SUBprofile invariance by sensitivity studies

摘要

The response of the electron temperature profile shape to variations of the electron heating and density profiles is investigated in different confinement regimes. It is shown that the changes in rTe= -Te/(dTe/dr) exceed the measurement error if the shape of the electron heat diffusivitye(r) is kept fixed. The observed constancy of rTe(r) in the outer half of the plasma is incompatible with such a fixede(r) shape, i.e., a Teprofile constraining mechanism must be present. Local transport laws of the formevaries as rTe-with4 ande(dTe/dr)with2 yield the experimental stiffness of the Te(r) shape but conflict with empiricalescalings. These results support the model of a self-organizing and adjustinge(r) causing Teprofile invariance