Measurements of the flux surface shapes in a tokamak with a non-circul
ar cross-section have been made using a tangentially viewing soft X ra
y pinhole camera. These measurements allowed the derivation of the val
ue of the axial safety factor, q(0), and the shape of the plasma curre
nt profile, during equilibrium modification experiments. Two different
equilibrium modification techniques were used: neutral beam current d
rive and plasma current ramp. In the neutral beam current drive experi
ment, tangential counter-injection was found to modify the equilibrium
significantly, broadening the current profile and raising the value o
f q(0) above unity. In tangential co-injection discharges, q(0) values
as low as 0.4 were observed. Reproduction of the measured q(0, t) usi
ng a radial current diffusion model strongly suggests there was a non-
classical component to the cross-field current diffusion. A plasma cur
rent ramp of 2.5 MA/s was also shown to broaden the current profile; h
owever, the value of q(0) was not altered.