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Neutrons are also produced at a rate of 106n/train by the pairs which
interact with the pole tips of the final quads, where 0.13 neutron is produced
per 1 GeV energy deposit.
For NLC, the VTX has n/cm2/train corresponding to 107
n/cm2/year. Since a tolerable neutron yield is n/cm2,
they cause no serious problem.
However, neutron yields from the beam dump must be problem because of the huge
energy deposit there. Without an efficient neutron absorber, the detector is
seriously damaged. The detailed design is needed for the extraction line
through the beam dump, so-called dump line.