First observations of intensity-dependent effects for transversely split beams during multi-turn extraction studies at the CERN proton synchrotron

摘要

During the commissioning of the CERN PS Multi-Turn Extraction (MTE), tests with different beam intensities were performed in order to probe the behaviour of resonance crossing in the presence of possible space charge effects. The initial beam intensity before transverse splitting was varied and the properties of the five beamlets obtained by crossing the fourth-order horizontal resonance were studied. A clear dependence of the beamlets’ parameters on the total beam intensity was found, which is the first direct observation of intensity-dependent effects for such a peculiar beam type. The experimental results are presented and discussed in detail in this paper.