1. Ballooning Structure of Core Turbulence
Use PCI to view bad curvature region, then good curvature region.
Create small bore, ohmically heated, limiter plasma (S. Cowley idea)
Rest on inner wall
Rest on outer RF limiter
Compare PCI wavelength spectra with GS2/GYRO simulations using synthetic PCI diagnostic [IAEA 2006]
Expect more isotropic spectrum when viewed from top/bottom
Careful: Strong major radius scaling of confinement
TFTR: L. R. Grisham et al., Phys. Rev. Lett. 64 (1991) 66.
kr<kq
kr~kq
Inner wall limited
Outer wall
limited
D. R. Ernst, L. Lin, M. Porkolab et al.
2007 C-Mod Ideas Forum