Cryomodules are the largest components of a superconducting particle accelerator. They house structures called superconducting accelerator cavities, which are lined up end-to-end inside the cryomodule. These cavities boost the energy of a particle beam as it travels through one after the next. This is the SSR1 cryomodule of the PIP-II accelerator. Photo: Tom Nicol, Fermilab