Liquid super-fluid Fusion?

Could a body be made to be a super-fluid, accelerated to insane speeds in a torus loop, and then a gate opens, allowing it to travel tangentially like a beam into an opposing beam of super-fluid generated with the same means, again at relativistic speeds, with energy stored over a long period of time,

The energy required to gain the required "relativistic" velocity would be significant and the mechanism for doing so would be highly challenging. You are asking for the "Mother of all turbo pumps".

What about some form of wake-field acceleration for neutral particles? is that possible?

Can a beam of accelerated atoms remain cool and be lowered in temp in transit?
Does a super-fluid impart momentum without drag?
What happens to sound in a super-fluid? Does a neutral atom emit synchrotron radiation?

Could high energy super-fluids be possible like a hot gas super-fluid? or a plasma super-fluid etc?

You are dancing on the outer edges of our understanding material behavior.

No, superfluids, by definition are frictionless, ie: no drag, so no way to transfer momentum except brutally slamming it to something. I think... Could be that it would envelope the target and not transfer any energy. OR perhaps the pressure/temperature increase of impact brings it out of the superfluid state?

I wonder if metallic hydrogen exhibits superfluid behavior? That would have the densities and temperatures to be useful. Unfortunately, it's not exactly easy to get or keep around...

So how does a superfluid deal with acceleration? Centrifugal forces and inertia? Does a rotating superfluid impart force like a top does? What would be the mechanisms that absorb this energy from the flywheel if not drag or friction etc?

Can you accelerate a liquid with traditional acceleration tech and have it change state with its rotation?

Cooper pairing and other entanglement effects may be possible to induce in materials that they have not yet considered..

Pretty sure that you would get a "boundary layer" of static super-fluid against the outer wall and then the rest of it would rotate freely against that.

Not sure about the rest. Super-fluids are so queer that intuition need not apply. There are papers on the subject and experiments into its behavior if you search around.

Fusion requires not just slamming stuff together really hard, but it has to be the kind of stuff that would fuse under the proper pressure, and temperature. I don't know of any suitable fuel that acts as a superfluid in anything except cryo-temperatures (Liquid Hydrogen/deuterium/tritium.) Supercooling it would raise the initial pressure necessary to reach fusion heat/density. We can do Fusion in the lab now, the problem seems to be sustaining the reaction. Once we figure that out, we still have to get more energy out of the reaction than we put in, or it's just a very expensive experiment. Supercooling a liquid, and accellerating it to relativistic speeds would likely use up at least as much energy as you could get out of it, with the supercooling making it pretty much impossible to sustain because as soon as you light the candle, you continue spraying it down with a high velocity jet of supercoolant. So no, not a viable concept.