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One awkward issue
is that most
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optimisation
studies have shown a small
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angle (~0.1rad)
is best for pion production
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But in my
optimisations the optimal angle
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seems to be near
zero!
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This could be
because the other studies
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have looked at
the pion yield closer to the
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target and not
downstream.
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Tilting the rod
could give a higher initial
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yield but with a
larger emittance
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