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Internal Note
Report number CERN-ACC-Note-2022-0022
Title Pre-LS2 correction of PSB main bending magnet hysteresis effects on the extraction trajectories
Author(s) Bukovics, Tibor (CERN) ; Di Giovanni, Gian Piero (CERN) ; Lauener, Joel (CERN) ; Mikulec, Bettina (CERN)
Corporate author(s) CERN. Geneva. ATS Department
Publication 2022
Imprint 18 Sep 2022
Number of pages 7
Subject category Accelerators and Storage Rings
Accelerator/Facility, Experiment CERN PS Booster
Keywords PS Booster ; TRIM ; Zero Cycle ; Ring 1-4 ; Extraction Line
Abstract The CERN Proton Synchrotron PS Booster is an accelerator composed by 4 superposed rings that have common bending magnets. These magnets have an asymmetry in the magnetic flux distribution between the inner and outer rings. A dedicated power supply, referred to as TRIM1+4, has been designed to provide extra current on the main windings and equalise the flux distribution. During the operation of the PSB it was empirically observed that after a ZERO cycle (without beam and with flat magnetic cycle), the extraction trajectory of the outer rings would differ from the nominal ones, measured after any standard operational cycle at 1.4 GeV. The observed change in trajectory would lead to sub-optimal steering to the downstream facility ISOLDE and the PS accelerator and, in turn, could cause beam losses or deterioration of the beam quality. In order to mitigate this problem, BE-OP requested a multi-ppm control of the voltage of the TRIM1+4 power supply. A dedicated measurement campaign was launched to validate the solution and find an optimal increase of the voltage for the TRIM1+4 for every cycle after a ZERO cycle, which would empirically match the nominal reference extraction trajectory.
Submitted by sylvia.dubourg@cern.ch

 


 Registro creado el 2022-09-19, última modificación el 2023-08-04


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