Abstract
During the commissioning of the CERN Proton Synchrotron multiturn extraction, tests with different beam intensities were performed in order to probe the behavior 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.
Highlights
The multiturn extraction (MTE) [1,2] has been proposed as a new beam manipulation in the transverse plane
In the case of a stable resonance, two structures will be generated: one representing the beam trapped in the islands, with an effective length corresponding to the machine length, times the resonance order; the second, made of the beam left in the center of the phase space, with a length corresponding to a single machine circumference
The longitudinal beam distribution has an impact on the space charge effects and it could affect the position of the beamlets after splitting
Summary
The multiturn extraction (MTE) [1,2] has been proposed as a new beam manipulation in the transverse plane. The beam will be eventually trapped in the islands as they move through the phase space area occupied by the charged particles. As a result of this manipulation the beam will be split in the transverse plane. In the case of a stable resonance, two structures will be generated: one representing the beam trapped in the islands, with an effective length corresponding to the machine length, times the resonance order; the second, made of the beam left in the center of the phase space, with a length corresponding to a single machine circumference. In the case of unstable resonances, only a single structure with a length corresponding to a multiple (equal to the resonance order) of the machine circumference is generated
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