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Figure 6

magnet geometry

Cross section of the toy model warm quadrupole overlaid by particle tracks along its length

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.