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Flagship Subcommi0ee Report and Next Steps June 26, 2015

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Flagship Subcommi0ee Report and Next Steps

June 26, 2015

Segmented Mirror Technology •  A Flagship-‐class mission will need to have a segmented primary

mirror •  Based on thermal expansion properHes and expected operaHon at

room temperature, either ULE or SiC are the best choices •  Glass will be machined mirrors or thin acHve face sheets with open

back •  Mirror stability criHcal – 20 pm over 10 minutes – trade between

CTE and conducHvity •  Trade between 5nm RMS surface figure and producHon rate needs

to be traded •  Segment size likely to be between 1.3 and 2.x m – larger than that

will require a new infrastructure (100’s $M) •  Goal is 3nm RMS – can this be done with 5nm RMS plus a DM?

Trade to see if you can accept the extra bounce in the UV

Segmented Mirror Technology

•  SiC a viable alternaHve – secHonal sHffness can be tuned to meet requirements for weight and stability

•  Areal density below 8 kg/m2

•  Mirrors can be acHve or passive •  Segments can be produced on 6-‐week centers

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Evolvable Space Telescope Concept •  To miHgate cost load by spacing the demand over Hme •  Launch a simple 2-‐mirror configuraHon and then add to it over Hme roboHcally •  Allows addiHon of newer technology •  Adds adaptability and serviceability •  Possible introducHon of instrument payload at the Prime Focus to improve

throughput

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RotaHng SyntheHc Aperture Concept

•  Developed by other government agencies •  Allows trades in collecHng area, angular resoluHon and integraHon Hmes •  Uncertain rotaHon rate compared to integraHon Hmes •  An 18m 6:1 raHo RSA design weighs only 22% of a convenHonal design

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CoaHngs for the FUV •  The convenHonal soluHon of Al

overcoated with MgF2 is sHll the simplest and most effecHve soluHon

•  OpHmum deposiHon technique involves heaHng the whole surface to 220 °C – can this be done uniformly enough for a large piece of glass? Similarly for LiF.

•  MgF2 has a cutoff in reflecHvity at 115nm – if deposited by ALD at the right thickness this can be extended into the FUV

•  Roughness of MgF2 coaHngs appears to be of order or less than UV wavelengths -‐> absorpHon and some sca0er

Page 7: Flagship)Subcommi0ee)Report and)NextSteps)...Segmented)Mirror)Technology) • SiC)aviable)alternave)–secHonal)sHﬀness) can)be)tuned)to)meetrequirements)for)weight and)stability)

Detector Technologies for a Flagship Mission

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Detector Technologies for a Flagship Mission

•  Given the recent progress made in the "standard" heritage detector types, most likely large, modern MCP detectors will be chosen for Flagship FUV instruments, CCDs for the opHcal instruments, and there will be a ba0le for the NUV crossover.

•  Photocathode improvements can sHll have a significant impact in overall instrument performance

•  OpHcal/NIR photon counters need their TRL increased significantly before becoming a Flagship detector

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Lessons Learned in PromoHng Flagship Missions

•  Must have a compelling science case (appeals to community, public, decision makers)

•  Mission provides a significant advance •  Mission provides broad involvement for the community

•  Focus on cost control •  Invest early in technology •  For large missions: complexity >> ∑ technologies •  Leverage exisHng technology investments •  Requirements must be clearly wri0en •  Insist on common instrument architectures

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