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Mirrors and Black Paint

Mirrors and Black Paint. R. Graue, D. Kampf Kayser-Threde. Status of Optical Mirrors Surface verification (example). Plane Mirror. Spherical Mirror. Status of Optical Mirrors. Completed Tasks

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Mirrors and Black Paint

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  1. Mirrors and Black Paint R. Graue, D. Kampf Kayser-Threde PACS FPU

  2. Status of Optical MirrorsSurface verification (example) Plane Mirror Spherical Mirror PACS FPU

  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) PACS FPU

  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: < 0.1%, TML: approx. 1.2 % • Vibration test (ambient, LHe) of test samples and FW structures (Nov.2003) PACS FPU

  5. i l m l m = 96 m 0.1 = 184 m o o q = 10 o o q = 10 o 10 q = 30 q = 30 i i l = 96 m m q = 50 Sample - 60 o Sample - 60 o 10 i Sample - 60 = 50 q o i Sample - 65 ) q q = 10 = 10 o 1 0.01 Specular reflection o q = 30 = 30 q i 1 o Sample - 65 = 50 Sample- 65 l = 184 m m i o q -1 q i = 50 Sample- 60 0.1 BRDF(sr-1) BRDF(sr Sample - 65 0.1 1E-3 0.01 0.01 1E-3 1E-4 100 -150 -100 -50 0 50 1E-3 Dq ) 0 20 40 60 80 Angle of reflection relative to specular direction ( -150 -100 -50 0 50 100 q Angle of incidence ) Dq Angle of reflection relative to specular direction ( i IR Coating - BRDF     • Measurement at 96 and 184 µm • KT 72 Black Paint: Sample 60 • Reference Black Paint: Sample 65    Specular reflection PACS FPU

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