1. PACS IHDR 12/13 Nov 2003 PACS FPU Mirrors and Black Paint R. Graue, D. Kampf Kayser-Threde

2. PACS IHDR 12/13 Nov 2003 PACS FPU Status of Optical Mirrors Surface verification (example) Plane Mirror Spherical Mirror

3. PACS IHDR 12/13 Nov 2003 PACS FPU 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. PACS IHDR 12/13 Nov 2003 PACS FPU 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)

5. PACS IHDR 12/13 Nov 2003 PACS FPU IR Coating - BRDF        -150-100-50050 100 1E-3 0.01 0.1 1 10 = 96  m Sample - 60  i = 10 o  i = 30 o  i = 50 o Sample- 65  i = 10 o  i = 30 o  = 50 o BRDF(sr-1) Angle of reflection relative to specular direction ( )  -150-100-50050100 1E-3 0.01 0.1 1 10 = 184  m Sample - 60  i = 10 o  = 30 o  i = 50 o Sample - 65  i = 10 o  = 30 o  = 50 o BRDF(sr ) Angle of reflection relative to specular direction (  ) Measurement at 96 and 184 µm KT 72 Black Paint: Sample 60 Reference Black Paint:Sample 65 020406080 1E-4 1E-3 0.01 0.1 = 96  m Sample - 60 Sample - 65 = 184  m Sample- 60 Sample - 65 Specular reflection Angle of incidence  i Specular reflection