Beam-Based Impedance Measurements

Elena Chapochnikova


Beam-based impedance measurements play an important role in benchmarking existing impedance models of the accelerator, as well as in elaborating them. Impedance measurements can be made with both stable and unstable beams. In the first case, one makes use of changes in stable bunch parameters, such as bunch length,  synchrotron frequency distribution, or synchronous phase shift. In the second case, measurements of instability characteristics (threshold, growth rates, bunch spectrum) can be used for impedance search or evaluation, usually by comparison with results of particle simulations.


Impedance; beam measurements.

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