China pursues 52 km collider project (Physics World)The world's #2 economy's biggest collider right now (one in Beijing) has 240 meters in circumference (about a quarter of a micron per capita) so they plan to improve their national record by a factor of 200+. ;-)
The proposed collider should be a "Higgs factory" colliding electrons and positrons at the energy of \(250\GeV\). While the Chinese say that this would put them at the forefront of particle physics, the representatives of the ILC which should be hosted by Japan say that it should be expected that the physics output of the Chinese collider should be very limited i.e. that the ILC should be superior.
I think that China is also working on a possible \(100\TeV\) hadron collider, a supersized Burger King Whopper SSC of a sort. As far as I know, Nima Arkani-Hamed was hired as the director of the Future Global High Energy Physics in a Chinese Dominated World or what's the exact name of the institution so he probably knows more about the status of these projects.
Too bad that the projects will take so much time.