= Solution
Both machines are proposed electron–positron <linear colliders>, using sources, damping rings, bunch compressors, two opposing main linacs, and final-focus and beam-delivery sections that bring very small bunches to an interaction point. The spent beams go to extraction lines and beam dumps rather than making repeated collision turns.
In the exam-era <International Linear Collider> reference design, polarized electrons and an undulator-based positron source feed damping rings and two superconducting main linacs; the full $500$ GeV centre-of-mass facility is about $31$ km long. The <Compact Linear Collider> adds high-current drive-beam generation and deceleration lines parallel to its main linacs; its $3$ TeV concept is roughly $48$ km long. The linear layout avoids the repeated synchrotron-radiation losses that would be severe for multi-hundred-GeV electrons in a storage ring. https://arxiv.org/abs/0712.2361[ILC Reference Design Report, Volume 3—Accelerator (2007), abstract and overall layout]{ref} https://cds.cern.ch/record/1500095[CLIC Conceptual Design Report, CERN-2012-007, accelerator concept and layout]{ref}
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