Speaker
Description
This paper presents the comprehensive magnetic design and simulation-based optimization of a prototype hybrid in-vacuum undulator (IVU), developed as a proof-of-concept for the 4th generation synchrotron light source (SPS-II) at the Synchrotron Light Research Institute (SLRI). Synchrotron radiation spectra simulations were performed using SPECTRA to calculate the expected photon flux for a configuration featuring a 20 mm period length and a 4.2 mm minimum gap at a 3 GeV electron beam energy. The magnetic structure was subsequently modeled in 3D using RADIA, employing NdFeB permanent magnets and FeCo-V poles. To ensure high-quality field distribution and beam stability, four distinct end-termination configurations were evaluated. The optimal configuration was selected based on its superior effectiveness in minimizing field integrals and beam trajectory deviations. A significant engineering challenge involving a peak attraction force of 18.8 kN was addressed through a Pure Permanent Magnet (PPM) force cancellation system. Through systematic parameter tuning and curve-fitting analysis, an optimized 16 mm period for the PPM array was determined. Furthermore, it was found that a 0.5 mm vertical installation offset relative to the main magnets is required to achieve precise force compensation. Simulation results demonstrate that this optimized system reduces the mechanical load by 99%, resulting in a residual force of only -166.1 N.
| Paper status | Proceeding files received |
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