2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/149668The present scenario for a high luminosity 4 TeV on center of mass muon collider requires a beta function =3 mm at the interaction point. We discuss a test model of a basic layout which satisfies the requirements although it is not fully realistic.9 pages, uses REVTEX macros. Submitted to the Proceedings of the Symposium on Physics Potential and Development of mu^+-mu^- Colliders, San Francisco, CA. Suppl. of the journal Nuclear Physics BAccelerator Physicstext