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Fig 1: Currently installed RP-attenuator. Red arrows indicate the beam path.
Fig 2: Photo of old RP attenuator before decommissioning. Note that a different hole pair was used by now.
2022 RP attenuator
4 mirrors and s-pol as input (one wave plate needs to be removed).
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Attenuation should be down to 0.35^4 = 0.015 (1.5%) or 800 mJ * 0.35^4 = 12 mJ < 14 mJ
Fig 23: Test setup for new RP-attenuator. Was installed just outside MPA.
Fig 4: New RP attenuator installed (Feb 15 2022)
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
- Whole test setup (Jan 2022): http://physics-elog.slac.stanford.edu/facetelog/show.jsp?dir=/2022/04/26.01&pos=2022-01-26T16:03:26
- Whole setup (Feb 2022): http://physics-elog.slac.stanford.edu/facetelog/show.jsp?dir=/2022/07/15.02&pos=2022-02-15T16:17:08
Wedge orientation
We added a wedge and AR coating to remove potential ghosts.
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