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Optical properties of components in a linac can be reconstructed fromanalysis of the orbit response matrix, composed from responses of BPMs tochanges in currents of dipole correctors. An efficient way to record suchresponse, discussed in this note, is to excite the corrector current with asine wave and record its Fourier component of the BPM spectrum. Because of anarrow band of the excitation signal, response to multiple correctors can berecorded at the same time without significantly affecting the signal-to-noiseratio. For that, the correctors are oscillated at different frequencies, andthe corresponding BPM Fourier components are recorded. In an ion(non-relativistic) linac, similar measurements can be performed for thelongitudinal plane as well. Examples of measurements at the PIP2IT test linacare shown.

Orbit response measurements with oscillating trajectories