Here we show an end view of the idealized quadrupole used for the toy model superimposed with the particle tracks in this region. The hits coming at negative X are from showers that are not fully contained by the toy model collimator. At positive X we find hits largely due to synchrotron radiation (from decay electrons) which passes all the way through the upstream dipoles. A more realistic quadrupole would have coil ends and these coil ends would probably have to be protected from such irradiation.
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