That's why I specifically said field gradients - i.e. the thing that gets larger when you have a stronger field in a smaller volume.

>it's the gradient of the pressure that generates turbulence

How exactly do you think that pressure is created?

Also, that link you provided is an editorial from one of the directors behind SPARC. If you want an objective analysis that is not geered towards possible investors, you need to look elsewhere. FYI, anyone selling you Q~10 designs without a considerable theoretical breakthrough is almost certainly conning you. If you don't believe me just look at how Lockheed's compact fusion reactor panned out. Stronger magnets are not some kind of miracle solution that will enable fusion tomorrow.