MILANO
Single step D=400mm, f=40°Diag From a message of Levacher about next step thermal analysis for the baffle can be allocated a space of 400x400mm Assuming Max Db=400mm FoV (Diag)=40° Dl=200mm We can have Lb~250 (corresponding to max 50° offaxis, enough for Sun with K=0.5) Milano, 6.3.9Matteo Munari Salvo Scuderi - INAF OACatania Single step Db=380mm Lb=168mm Double step Db=723mm Lb=486mm
SS400mm with vanes Vanes are used so to ensure that the entrance of the system cannot see parts of the baffle directly illuminated by the offaxis source Milano, 6.3.9Matteo Munari Salvo Scuderi - INAF OACatania
SS400MM Vanes 100% Lambertian R5% Milano, 6.3.9Matteo Munari Salvo Scuderi - INAF OACatania IN:5E-1W OUT:1.8E-5W R=3.6E-5
Weights ElementWeight(g) Tube510 Front18 Edge125 Edge236 Edge349 Edge466 Edge587 Edge6109 Edge7132 Back153 TOTAL1184 Milano, 6.3.9Matteo Munari Salvo Scuderi - INAF OACatania Aluminium (2.7 g/cm3) 0.6mm thickness
Edges If vane edges are plane greater contributor Milano, 6.3.9Matteo Munari Salvo Scuderi - INAF OACatania Power=4.66E-6WPower=1.27E-5W
Edges Beveled Edges, bevel oriented toward outside for the first vanes, toward inside for the others (turning point: when is impossible to light the bevel directly) Milano, 6.3.9Matteo Munari Salvo Scuderi - INAF OACatania Power=4.9E-6W
Baffle width variation (radius) (length fixed 250mm) Milano, 6.3.9Matteo Munari Salvo Scuderi - INAF OACatania
Both Sizes Variation Milano, 6.3.9Matteo Munari Salvo Scuderi - INAF OACatania
Complete TOU Milano, 6.3.9Matteo Munari Salvo Scuderi - INAF OACatania Lenses Front / back : no scattering AR 1% ideal Side: scatter 4% reflect 1% (No TIR) Mountings (Baffle, vanes, stop, telescope tube, lens diaphgrams) Scatter 4% reflect 1% CCD reflect 5% Baffle dimensions: 440dia - 250length
Weights ElementWeight(g) Tube561 Front25 Edge134 Edge246 Edge361 Edge480 Edge5102 Edge6126 Edge7150 Edge8174 Back176 TOTAL1535 Milano, 6.3.9Matteo Munari Salvo Scuderi - INAF OACatania Aluminium (2.7 g/cm3) 0.6mm thickness
PST PST= Point source transmission = detector irradiance/entrance pupil irradiance (for a point source) Irradiance= power/surface Sometime defined in slight different ways (using power or using system aperture) Milano, 6.3.9Matteo Munari Salvo Scuderi - INAF OACatania
PST Milano, 6.3.9Matteo Munari Salvo Scuderi - INAF OACatania
25 deg bump Milano, 6.3.9Matteo Munari Salvo Scuderi - INAF OACatania
Cut (and painted) last lens Milano, 6.3.9Matteo Munari Salvo Scuderi - INAF OACatania
NOISE AND SUN From PDR Noise(ph)/ Noise(b)>3 Count(ph)/ Count(b)>9 Based on a 9 pxs psf, 40 tel phot noise 27ppm/h, G0 star of mv=11.15 (ReferenceStar) To be budgeted beetwen zodiacal light, straylight, hot spots, thermal noise Count(ph) is the total photon count form RS (PhRS) or per pixel (9 pixels) photon count (PhRS/9) (Count(ph)=PhRS or count(ph)=PhRS/9)? SUN mv= G2 Flux ratio F(Sun)/F(RS)=~10^15 approx photon count same ratio PhSUN=1E15*PhRS PST(50°)<1E-9 – 1E-10 For us PST(50°) ~ 1E-6 – 1E-7 SUNSHIELD!!! Milano, 6.3.9Matteo Munari Salvo Scuderi - INAF OACatania
Ghosts Milano, 6.3.9Matteo Munari Salvo Scuderi - INAF OACatania 0° 10° 15° Full detector P=6.44E-2 100x100 pxls P=6.39E-2
Issuses/Future work TOU mechanical model SunShield Model (Zodiacal light, Out of FoV stars) Sky Model (other sources) Materials and paintings … Milano, 6.3.9Matteo Munari Salvo Scuderi - INAF OACatania
Milano, 6.3.9Matteo Munari Salvo Scuderi - INAF OACatania
Milano, 6.3.9Matteo Munari Salvo Scuderi - INAF OACatania
SQUARED? Milano, 6.3.9Matteo Munari Salvo Scuderi - INAF OACatania
Milano, 6.3.9Matteo Munari Salvo Scuderi - INAF OACatania 30°cut buffle
Milano, 6.3.9Matteo Munari Salvo Scuderi - INAF OACatania
Milano, 6.3.9Matteo Munari Salvo Scuderi - INAF OACatania
Milano, 6.3.9Matteo Munari Salvo Scuderi - INAF OACatania
Milano, 6.3.9Matteo Munari Salvo Scuderi - INAF OACatania
Milano, 6.3.9Matteo Munari Salvo Scuderi - INAF OACatania
Milano, 6.3.9Matteo Munari Salvo Scuderi - INAF OACatania