Mirror
The current mirror installed at 2-BM-A is the original APS-M1 mirror (pre-APS-U), which has been recoated and returned to service post APS-U. The new mirror (APS-U-M1) is not yet in use.
Substrate
Parameter |
Value |
Dimensions |
1200 x 100 x 75 mm |
Substrate material |
Silicon |
Recoating
The original Cr coating was stripped, the substrate cleaned and measured with optical metrology, then overcoated with 10 nm Cr on the entire surface, followed by:
Stripe |
Coating |
Note |
a |
5 nm Pt |
|
b |
W(1.2nm)/Si(5.37nm) × 50 multilayer |
× 50 multilayer, d-spacing 8.8% below spec |
c |
W(1.2nm)/Si(3.56nm) × 50 multilayer |
× 50 multilayer, d-spacing 10.1% below spec |
d |
W(1.2nm)/Si(2.73nm) × 50 multilayer |
× 50 multilayer, d-spacing 9.4% below spec |
The figure below shows the expected flux for the Pt stripe and the three multilayer stripes:
For more details see the deposition lab recoating report available here.
Reference Documents
Mirror substrate drawing: mirror reference
Disassembly process: photos
Metrology on original M1: metrology report
M1 to APS-U-M1 retrofit: retrofit document