Speaker
Description
To produce beam for the nTOF and East Area experimental facilities at CERN, the Proton Synchrotron (PS) simultaneously accelerates two bunches with very different intensities. This combined acceleration cycle gains time and flexibility for beam sharing across the accelerator complex. However, to fulfil the demanding beam requests for future facilities like the Search for Hidden Particles (SHiP) experiment, a higher bunch intensity delivered to nTOF is essential to maintain the average flux at a reduced repetition rate. This further increases the intensity difference with respect to the low-intensity bunch for the East Area. In this contribution, longitudinal dipole oscillations triggered by the intensity-dependent phase jump at transition crossing are exposed. A mitigation technique is derived analytically and demonstrated in beam tests, by tuning one cavity of the main RF system to a separate harmonic of the revolution frequency. This allowed the elimination of dipole oscillations at transition crossing and the preservation of beam quality, even with a significant increase of the nTOF bunch intensity.
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