• Numerical calculations of potential distribution in non-ideal quadrupole trap and simulations of anharmonic oscillations

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      https://www.ias.ac.in/article/fulltext/pram/070/03/0457-0470

    • Keywords

       

      Quadrupole ion trap; multipole moments; boundary element method.

    • Abstract

       

      A quadrupole ion trap consisting of electrode structures symmetric about 𝑧-axis is an important tool for conducting several precision experiments. In practice the field inside the trap does not remain purely quadrupolar, and can be calculated using numerical methods. We have used boundary element method to calculate the potential inside the truncated as well as symmetrically misaligned quadrupolar ion trap. The calculated potential values are fitted to multipole expansion and the weights of multipole moments have been evaluated by minimizing the least square deviation. The higher-order multi-pole contribution in the fabricated hyperbolic electrodes due to truncation and machining imperfections is discussed. Non-linear effects arising due to the superposition of octupole moment manifest as anharmonic oscillations of trapped ions in the non-ideal Paul trap. Theoretical simulations of non-linear effects have been carried out.

    • Author Affiliations

       

      Anita Gupta1 Pushpa M Rao1

      1. Spectroscopy Division, Bhabha Atomic Research Centre, Mumbai 400 085, India
    • Dates

       
  • Pramana – Journal of Physics | News

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