MILANO 06.03.09. 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.

Presentazione sul tema: "MILANO 06.03.09. 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."— Transcript della presentazione:

1 MILANO 06.03.09

2 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

3 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

4 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

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

6 Edges If vane edges are plane greater contributor Milano, 6.3.9Matteo Munari Salvo Scuderi - INAF OACatania Power=4.66E-6WPower=1.27E-5W

7 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

8 Baffle width variation (radius) (length fixed 250mm) Milano, 6.3.9Matteo Munari Salvo Scuderi - INAF OACatania

9 Both Sizes Variation Milano, 6.3.9Matteo Munari Salvo Scuderi - INAF OACatania

10 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

11 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

12 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

13 PST Milano, 6.3.9Matteo Munari Salvo Scuderi - INAF OACatania

14 25 deg bump Milano, 6.3.9Matteo Munari Salvo Scuderi - INAF OACatania

15 Cut (and painted) last lens Milano, 6.3.9Matteo Munari Salvo Scuderi - INAF OACatania

16 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=-26.75 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

17 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

18 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

19 Milano, 6.3.9Matteo Munari Salvo Scuderi - INAF OACatania

20 Milano, 6.3.9Matteo Munari Salvo Scuderi - INAF OACatania

21 SQUARED? Milano, 6.3.9Matteo Munari Salvo Scuderi - INAF OACatania

22 Milano, 6.3.9Matteo Munari Salvo Scuderi - INAF OACatania 30°cut buffle

23 Milano, 6.3.9Matteo Munari Salvo Scuderi - INAF OACatania

24 Milano, 6.3.9Matteo Munari Salvo Scuderi - INAF OACatania

25 Milano, 6.3.9Matteo Munari Salvo Scuderi - INAF OACatania

26 Milano, 6.3.9Matteo Munari Salvo Scuderi - INAF OACatania

27 Milano, 6.3.9Matteo Munari Salvo Scuderi - INAF OACatania

28 Milano, 6.3.9Matteo Munari Salvo Scuderi - INAF OACatania