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Description
Non-destructive beam profile monitoring is critical for high-intensity proton accelerators like the CSNS Rapid Cycling Synchrotron (RCS). While the Ionization Profile Monitor (IPM) typically reconstructs beam profiles by collecting ionization electrons from residual gas, a key challenge arises from positive ions drifting toward the field cage. Their impacts generate secondary electrons that propagate back to the detector, causing significant beam profile distortion. To mitigate this, an ion trap with a specifically designed slit opening was implemented. This structure selectively allows positive ions to pass through the slit and be confined on the rear side, while effectively suppressing secondary electrons from reaching the sensor. A comprehensive simulation study was performed to optimize the ion trap geometry and performance for the IPM. This paper presents the optimization process and results for the ion trap implemented in the CSNS RCS IPM.
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