2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/85795We have performed bunch lengthening and microwave instability threshold measurements on the positron ring of the Frascati electron-positron Phi-factory DAPhNE. The results are in a good agreement with earlier analytical predictions and numerical simulations.23 pages, 14 figuresAccelerator Physicstext