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Attenuation should be down to 0.35^4 = 0.015 (1.5%) or 800 mJ * 0.35^4 = 12 mJ
Henrik's test setup (originally placed just outside the MPA):
Reflectivity tests
- Individual mirrors (Dec 2021): http://physics-elog.slac.stanford.edu/facetelog/show.jsp?dir=/2021/49/07.12&pos=2021-12-07T14:37:00
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