Focusing with quadrupoles?

  1. Hello,

    I read that quadrupole magnets focus in one plane and defocus in the
    other. I understand that in a doublet configuration (FODO) one can get
    net focusing in both planes. But in this case the beta function is big
    in one tranverse plane and small in the other for a given position
    along the beamline.

    How can it be that at a collision point of a particle accelerator one
    can squeeze the beam in both planes? I heard that triplets can do
    that. Where can I read more about this?

    Natalia Sanchez
  2. jcsd
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