MOABI1
RIKEN Nishina Center, Wako, Japan
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MOABI1 |
Beam Optics Analysis of Large-acceptance Superconducting In-flight Separator BigRIPS at RIKEN RI Beam Factory | |
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| The BigRIPS in-flight separator serves to produce rare isotope (RI) beams at RIKEN RI Beam Factory, in which studies of exotic nuclei are extensively made. It is characterized by large acceptances and two-stage structure, allowing efficient production of RI beams using in-flight fission and high resolving power in particle identification (PID). The large acceptances are achieved by using iron-dominated superconducting quadrupoles with large apertures and high pole-tip fields. The PID is made in the second-stage of BigRIPS, in which precise momentum measurement is performed by trajectory reconstruction using ion-optical transfer maps and measured ion-trajectories. Elaborate beam optics calculation and analysis are essential to tune ion optics and achieve high PID resolving power, because the quadrupoles have large fringe-field regions and their field distribution varies largely as the iron is saturated. The optics calculation has to be made based on precise field map data measured as a function of field strength. In this talk we outline computational needs in the BigRIPS separator, emphasizing the method and analysis of beam optics calculations and comparison with measurements. | ||
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Slides MOABI1 [4.126 MB] | |