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Determine experimentally whether such a section produces a measurable reduction of hadron energy spread or emittance, with a cooling rate within a factor 2 of theory.","problem_ref":null,"references":"","settled_by":"A measured reduction of hadron bunch length, energy spread or emittance that switches off when the electron beam or amplifier is detuned.","status_note":"Proof-of-principle work at the BNL RHIC ring reported amplifier, beam-dynamics and diagnostic results; conference and journal records checked through mid-2026 report no observed cooling of hadrons.","title":"Experimental demonstration of coherent electron cooling of 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