Ztf filters substrates
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550. 25.4. 17.2. 0. 9.70. 4.82. ZTF Filters: Substrates. 50.8 cm CA on 55cm substrate Plano Convex Thickness options effects focal distance TBD strength, mounting, flexure TBD coating stress impact. Type XIV. Type IX. ZTF Filters: Coatings.

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ZTF Filters: Substrates

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Ztf filters substrates

550

25.4

17.2

0

9.70

4.82

ZTF Filters: Substrates

ZTF Technical Meeting

50.8 cm CA on 55cmsubstrate Plano Convex

Thickness options

  • effects focal distance

  • TBD strength, mounting,flexure

  • TBD coating stress impact

Type

XIV

Type IX


Ztf filters coatings

ZTF Filters: Coatings

ZTF Technical Meeting

r’, g’, specified >95%, 1/4 l PP irregularity in 12cm aperture

g’ throughput may be difficult to achieve

Performance requirements TBR

Throughput level (absolute) vs(averaged over band)

Response uniformity over field (cone input varies by 2.5o)


Ztf filter procurement

ZTF Filter Procurement

ZTF Technical Meeting

Substrates: ROM Cost by SESO

Quantity three each = 2 color filters + 1 spare

150 - 200 k EUROS

12-14 month delivery

Same for either thinner or thicker substrate.  

Tolerances:

  Irregular wave front error    1/2 l PP over any 120 mm diameter    GOAL

Exceeds estimated spec of1/4 l PP

Coatings: ROM cost from JDSU

  • Quantity 2 each of g’, r’ filters

  • 152 k USD each filter + 38k USD NRE ( no quantity discount )

  • 2 month delivery ARM, 4.5 month ARO


  • Ztf filter future work

    ZTF Filter, Future Work

    ZTF Technical Meeting

    • To do:

    • Optical analysis of WFE tolerance (substrate + filter)

    • figure / dimensional tolerances

    • WFE spherical overall

    • WFE irregular aperture

    • Mechanical analysis of substrate / mounting

    • Establish minimum filter efficiency, uniformity & stability requirements

    • Re-quote filter & substrate


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