Since Phongn isn't playing, I guess the "knows stuff about accelerators" hat passes to me...
I'd actually recommend a ring supercollider, because it has a very plausible origin story within the context of the UOCSR, a nation which has long has respectable technologists, but (I gather) has trouble mustering the very best. The historical LHC was built in the tunnels of CERN's old Large Electron-Positron Collider, using superior magnet technology to what was available when the LEP was built in the '80s.
The UOCSR might have done something similar- built a huge set of collider tunnels, concluded that they weren't doing as much science with it as they'd hoped, and then scrapped the actual collider in order to build a better one with some degree of collaboration.
On the other hand, if you want something that's under construction right now, a powerful linear lepton collider might actually be a great idea. Linear colliders for protons or ions really don't make a lot of sense.
Final note: it really isn't very likely that several LHC-class supercollider rings will exist on Tellus. The main limiting factor on the data such a machine can gather is its own power and precision; getting better results requires a qualitatively superior machine. Having five times as much data all of the same kind is less valuable than having one set of data from the best possible machine.
So building four clones of the LHC, and running all five machines at once, wouldn't give us five times as much scientific knowledge as one LHC. And it would result in a lot of dilution and duplication of effort. Instead, at this level it honestly makes more sense to (essentially) build one huge high-energy collider in the whole world and have all the greatest scientific talent gather there.
There are plenty of niches for other, smaller accelerators- but what you won't see is six different countries all building LHC clones. Whoever builds the first such machine, or who has built the biggest, will draw the lion's share of attention and interest from the high energy physics community.
[Thus, a vastly disproportionate number of high energy physicsts go to Europe and to Switzerland to do their work; had the SSC been built in the US, Texas would have likely wound up the high energy physics capital of the world for the same reasons]
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RE: Own post in Story thread:
Little news piece that ties into something I'm doing later. The best comparison I can come up with for Cloud Palace 3 is that it's a cross between the American Manned Orbiting Laboratory concept, the Soviet Salyut 4 and 5, and Salyut 6. At the moment it lacks the docking infrastructure to perform the Soviets' excellent long-term habitation work, but there is a design to fit it with a suitable docking module assembly in orbit.
In other news, the Umerian Star Boat capsule is very possibly the worst one in widespread use in the world today. It's functional enough, but it has a two man crew, a... truly unique method of landing, and it may be the only active manned capsule design with a hole cut in the heat shield so you can climb out into the docking port. You do NOT want to open that door during reentry.
