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The paper proposes a method of finding the beam loss locations in a linac. Ifthe beam is scraped at an aperture limitation, moving its centroid with twodipole correctors located upstream and oscillating in sync produces a line atthe corresponding frequency in spectra of current-sensitive devices downstreamof the loss point. The phase of this signal contains information about thelocation of the beam loss. Similar lines appear also in the position signals ofBeam Position Monitors (BPMs). The phases of the BPM position lines changemonotonically (within each 2{\pi}) along the linac and can be used a referencesystem. The phase of the loss signal compared with this reference systempinpoints the beam loss location, assuming that longitudinal coordinates of theBPMs are known. If the correctors deflection amplitudes and the phase offsetbetween their waveforms are chosen optimally and well calibrated, the samemeasurement provides values of the \b{eta}-function and the betatron phaseadvance at the BPM locations. Optics measurements of this type can be madeparasitically, with negligible effect on the emittance, if a long measurementtime is acceptable.

Finding beam loss locations in a linac with oscillating dipole correctors