Mirrors and Black Paint

1
Mirrors and Black Paint

• R. Graue, D. Kampf
• Kayser-Threde

2
Status of Optical MirrorsSurface verification
(example)
Plane Mirror
Spherical Mirror
3
Status of Optical Mirrors

• Completed Tasks
• Manufacturing, tests and coating (gold sputtered)
  for CQM and PFM mirrors (incl. Alignment mirrors)
• Open issues/NCRs
• Partial release of gold coating at single mirror
  lots NCR processing in progress (e.g. process
  optimization)

4
IR Coating Status

• Improved coating procedure KT 72 Black Paint
• Trade Off selection of baseline coating completed
• Surface characteristics deep black, rough
  surface
• Thickness (average) 430 µm
• Total mass 1.7 kg (4.2 m²)
• Completed Test verification
• BRDF and specular measurements (Delft
  University), ambient temperatures
• Liquid nitrogen shock tests
• Outgasing tests CVCM lt 0.1, TML approx.
  1.2
• Vibration test (ambient, LHe) of test samples and
  FW structures (Nov.2003)

5
IR Coating - BRDF
?
?
?
?

• Measurement at 96 and 184 µm
• KT 72 Black Paint Sample 60
• Reference Black Paint Sample 65

?
?
?
Specular reflection