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High Energy Physics - ExperimentEnglishPublished
FCC‑μe proposes a simultaneous high‑energy muon–electron collider and neutrino factory at CERN’s future circular collider
arXiv: 2610.40451v1
A new study shows that the FCC‑ee facility could host in parallel a muon–electron collider, FCC‑μe, operating between 1 and 2 TeV centre‑of‑mass energy with a total average luminosity exceeding 10^34 cm⁻² s⁻¹—far above the expectations for an electron–positron ring alone. The design capitalises on an ultra‑cold anti‑muon source, two linear accelerators borrowed from the LHeC programme, and a large muon storage ring that can reach 1–5 TeV energy. The anti‑muons would collide head‑on with the FCC‑ee electron beam, producing a clear headline of a new experimental platform. [visual_1]
The layout follows the μTRISTAN proposal, modified with recent advances from the LHeC. In practice, a 2‑TeV anti‑muon beam directs into a 120 GeV electron beam at the chosen interaction point, achieving a peak luminosity of 3.2 × 10³⁴ cm⁻² s⁻¹ and a collision rate of 1 MHz. The muon and electron beams arrive with equal emittances, giving a highly focused interaction region: horizontal and vertical rms widths of 4 µm and 0.6 µm respectively. This precision is illustrated in the experimental parameters table. The ring circumference is roughly 6 km for the 2‑TeV ring and 9 km for the two‑linac booster, making the overall complex a substantial addition to the existing infrastructure. [visual_2]