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China Plans Particle Colliders That Would Dwarf CERN's LHC
ananyo (2519492) writes Scientists at the Institute of High Energy Physics (IHEP) in Beijing, working with international collaborators, are planning to build a "Higgs factory" by 2028 — a 52-kilometer underground ring that would smash together electrons and positrons. Collisions of these fundamental particles would allow the Higgs boson to be studied with greater precision than at the much smaller (27 km) Large Hadron Collider at CERN, Europe's particle-physics laboratory near Geneva, Switzerland. Physicists say that the proposed US$3-billion machine is within technological grasp and is considered conservative in scope and cost. But China hopes that it would also be a stepping stone to a next-generation collider — a super proton-proton collider — in the same tunnel. The machine would be a big leap for China. The country's biggest current collider is just 240 meters in circumference.
Every country has make-work projects, some of them even have additional benefits - the EU is currently reviewing a energy savings plan where one of the main points is "costs will be offset by the jobs created to implement this directive". Make-work.
In reality, the Chinese project is definitely not make-work if they plan to do actual research. The "ghost cities" you talk about are actually gradually filling up as more population moves from rural settings into the cities - this has been a long term goal of the Chinese government, but their "long terms" are a fair longer than the "around next election time" terms that westerners tend to think in.
If you want to see some real "ghost cities" there are plenty in Spain, entire towns and cities, with airports, which were built to sustain the Spanish building industry during the 2008-2013 period, and the properties have never been put on the market.
In reality, the Chinese project is definitely not make-work if they plan to do actual research.
True but a circular design for a electron-positron collider is far from the most efficient. At the energies needed to create the Higgs the energy loss caused by bending the electrons around in a ring means that the ring has to be far longer in circumference than a 'one-shot' linear collider would need to be. Worse if we find something even more exciting like Supersymmetry in our next run of the LHC starting this coming March you will never be able to increase the energy of a circular e-p machine to study it whereas with a linear collider you can extend it.
A circular machine only makes sense with heavier particles like protons but I question whether the cost savings of a single tunnel for both an e-p machine and a future proton machine will outweigh the massive increase in the cost of the magnets and accelerating cavities for the e-p machine.