Scientists behind the world's largest atom smasher have laid out their multibillion-euro vision to build an even bigger one, in hopes of unlocking even more secrets of matter and the universe in the coming decades.
Officials at CERN, the European Organisation for Nuclear Research, presented their study for a "Future Circular Collider" inside a 100km circumference tunnel that could start operating in 2040.
It would sit next to the current 27km circumference Large Hadron Collider near Geneva, which is perhaps best known for helping confirm the subatomic Higgs boson in 2012.
Officials hope for a decision by CERN's 22 member states within the next few years about the project that would debut with an electron-positron collider at an estimated cost of nine billion euros ($A14.23 billion).
A second phase would involve a superconducting proton machine in the same tunnel, at a cost of about 15 billion euros more. That machine could start operation in the late 2050s.
The concept paper, five years in the making, aimed to explore prospects of "tantalisingly more powerful particle colliders that can inaugurate the post-LHC era in high-energy physics," CERN said on its website.
Ultimately, the FCC would include a superconducting proton accelerator ring with energy of up to 100 tera electron volts, compared with a maximum 17 TeV in the current collider.
CERN Director-General Fabiola Gianotti called the report "a remarkable achievement" that could help boost understanding of fundamental physics and advance technologies.
CERN said it was not possible to say exactly what benefits the new collider would bring, but pointed out that the discovery of the electron in 1897 led to the electronics industry that now contributes $US3 trillion annually to the world economy.
