Measurements on the coherent synchrotron radiation effects in SURF III beam

In order to verify that the forming of consistent micro-bunches leads to bursts of coherent synchrotron radiation and to the self-cooling of the micro-bunches, three series of experiments have been performed on the SURF III ring. perimental results are presented and discussed. They could explain the reasons for inducing coherent synchrotron oscillation with saw-tooth instabilities. A method to maintain the coherent synchrotron radiation and its cooling effect, while suppressing the instabilities, is submitted.