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Figure 8

magnet geometry

Same as Figure 1 except that we have added a shield to contain the synchrotron radiation photons generated by the decay electrons

Here we have the same layout as shown in Figure 1 except that a shield has been added, inside the beam pipe, on the ring outside, in order to intercept the synchrotron radiation generated by the decay electrons in the 5 Tesla dipole field. The shield keeps the synchrotron radiation photons from hitting the beam pipe anywhere near the outer superconduting coils. With this shield the horizontal spread of the beam pipe can be dramatically reduced. The shield cross section is shown in the next figure.