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