The Large Ultraviolet/Optical/Infrared (LUVOIR) Science and Technology Definition Team (STDT) identified a broad range of science objectives for LUVOIR that include the direct imaging and spectral characterization of habitable exoplanets and an array of general astrophysics and Solar System observations. To meet these objectives, the LUVOIR Study Office completed the first design iteration of a 15-m segmented-aperture observatory that includes four serviceable instruments: the Extreme Coronagraph for Living Planetary Systems (ECLIPS); the LUVOIR UV Multi-object Spectrograph (LUMOS); the High Definition Imager (HDI); and Pollux, a high-resolution UV spectro-polarimeter being contributed by Centre National d'Etudes Spatiales (CNES). The study team is now executing a second design iteration to further improve upon the 15-m concept, while simultaneously studying a 9-m concept. In these proceedings, we provide an update on these architectures

Bolcar, Matthew R.

Crooke, Julie

Hylan, Jason

NASA Technical Reports Server

Matthew R. Bolcar, Jason Hylan, Julie Crooke
and the LUVOIR Study Team
NASA / GSFC
SPIE Astronomical Telescopes & Instrumentation
Austin, TX
11 June 2018
Talk 10698-23
https://ntrs.nasa.gov/search.jsp?R=20180005472 2019-08-31T15:04:02+00:00Z
What is LUVOIR?
Large UV / Optical / Infrared Surveyor
A space telescope concept in tradition of Hubble:
• Broad science capabilities
• Far-UV to near-IR bandpass
• Suite of imagers and spectrographs
• 5-year prime mission, extendable through 
serviceability and upgradeability
• Guest-observer driven
11 June 2018 2LUVOIR, SPIE 10698-23, Bolcar, Austin, TX
“Space Observatory for the 21st Century”
Ability to answer the questions of the 2030s and beyond
A Tale of Two LUVOIRs
• LUVOIR-A
• 15-m diameter segmented, obscured aperture
• Four instrument bays:
• Extreme Coronagraph for Living Planetary Systems (ECLIPS-A)
• LUVOIR UV Multi-Object Spectrograph (LUMOS-A)
• High Definition Imager (HDI-A)
• Pollux – High-res. UV Spectropolarimeter (CNES Contributed)
• Designed to use SLS Block 2 launch vehicle with an 
8.4 x 27.4-m fairing
• LUVOIR-B
• 8-m diameter segmented, unobscured aperture
• Three instrument bays:
• ECLIPS-B
• LUMOS-B
• HDI-B
• Designed for a “conventional” 5 x 19.8-m fairing and 
heavy-lift rocket
11 June 2018 3LUVOIR, SPIE 10698-23, Bolcar, Austin, TX
The LUVOIR Study Team
• Science and Technology Definition Team 
• 25 voting members from community
• 10 non-voting reps. of international space agencies
• Six Community Working Groups
• Exoplanets
• Cosmic Origins
• Solar System
• Simulations
• Communications
• Technology
• Four Instrument Teams
• Study Office located at 
GSFC and provides 
engineering design support
11 June 2018 4LUVOIR, SPIE 10698-23, Bolcar, Austin, TX
Organization
5
Study Manager
Julie Crooke
Study Scientist
Aki Roberge
Lead Engineer
Matthew Bolcar
Deputy Lead 
Engineer
Jason Hylan
Deputy Study 
Scientist
Shawn Domagal-
Goldman
Integrated 
Modeling Lead
Lia Sacks
Optical 
Systems Lead
Bill Hayden
Thermal 
Systems Lead
Bryan Matonak / 
Kan Yang
Integrated 
Modeling Team
Carl Blaurock (NSS)
Jean-Etienne Dongmo
Kong Ha
Alice Liu
Optical Design 
Team
James Corsetti
Qian Gong
Garrett West
Mechanical 
Design Team
Ginger Bronke
Joe Generie
Drew Jones
Structural 
Analysis
Christine Collins
Thermal 
Analysis
Sang Park 
(SAO)
Coronagraph
Systems
Tyler Groff
Neil Zimmerman
STDT
11 June 2018
SSAT
Industry Partners
Ball Aerospace
Harris
Lockheed Martin
Northrop 
Grumman
LUVOIR, SPIE 10698-23, Bolcar, Austin, TX
LUVOIR Science
11 June 2018 LUVOIR, SPIE 10698-23, Bolcar, Austin, TX 6
Imagine Astronomy with LUVOIR
11 June 2018 LUVOIR, SPIE 10698-23, Bolcar, Austin, TX 7
Low-mass galaxy at z = 2 
with Hubble
Low-mass galaxy at z = 2 
with LUVOIR-A
Credit: G. Snyder (STScI)
Solar System Remote Sensing
11 June 2018 LUVOIR, SPIE 10698-23, Bolcar, Austin, TX 8
Pluto with HST Pluto with LUVOIR-A
Credit: NASA / New Horizons / R. Parramon
Imaging Earth 2.0
11 June 2018 LUVOIR, SPIE 10698-23, Bolcar, Austin, TX 9
Inner working angle
~ 3.5 λ / D
Modern Earth with LUVOIR-A
11 June 2018 LUVOIR, SPIE 10698-23, Bolcar, Austin, TX 10
Credit: LUVOIR Tools / T. Robinson (NAU) / G. Arney (NASA GSFC)
O3
O2 H2O H2O
Strategy for Habitable Exoplanets
11 June 2018 LUVOIR, SPIE 10698-23, Bolcar, Austin, TX 11
C
redit: T. B
. G
risw
old (N
A
S
A G
S
FC
)
Exoplanet Yields in 2-year Survey
11 June 2018 LUVOIR, SPIE 10698-23, Bolcar, Austin, TX 12
Color photometry, orbit determination, and spectroscopic search for water/methane
Additional follow-up spectroscopy of promising planets
C
redit: C
. S
tark (S
TS
cI)
LUVOIR-A
11 June 2018 LUVOIR, SPIE 10698-23, Bolcar, Austin, TX 13
Status Update
• Completed first iteration of architecture design 
last year
• Full mission design: telescope, instruments, 
spacecraft, ground system, orbit, etc.
• After evaluating science yields, executed a 
redesign of Architecture A payload
• Goal of improving exoEarth yields
11 June 2018 LUVOIR, SPIE 10698-23, Bolcar, Austin, TX 14
Architecture A Redesign
• Optimized aperture geometry for compatibility with coronagraphs
• Forced a redesign of the instruments to work with new prescriptions
11 June 2018 LUVOIR, SPIE 10698-23, Bolcar, Austin, TX 15
NewOld
15.0 m15.0 m
1.4 m3.5 m
13.5 m12.8 m
1.2 m2.7 m
Additional Changes to LUVOIR-A
• Changed coronagraph instrument design
• Replaced point-source fiber-fed spectrometers with integral 
field spectrograph
• Dramatic improvement in throughput and observing efficiency
• Optimized channel transition wavelengths to take advantage 
of low-noise detectors in visible
• Updated thermal architecture to better support passive 
cooling of the instrument detectors
• Updated payload articulation concept to align center-
of-gravity with center-of-pressure
• Improved operations concept / reduced number of momentum 
dumps
11 June 2018 LUVOIR, SPIE 10698-23, Bolcar, Austin, TX 16
Architecture Highlights
11 June 2018 LUVOIR, SPIE 10698-23, Bolcar, Austin, TX 17
15-m Segmented
Aperture
Flat, 2-3 Layer
Sunshade
Vibration Isolation
& Precision Pointing System
(VIPPS)
Credit: D. Jones (NASA GSFC)
Architecture Highlights
11 June 2018 LUVOIR, SPIE 10698-23, Bolcar, Austin, TX 18
Pollux
LUMOS
ECLIPS
HDI
Multi-axis Payload
Articulation Arm
Credit: D. Jones (NASA GSFC)
Architecture
Highlights
11 June 2018 LUVOIR, SPIE 10698-23, Bolcar, Austin, TX 19
Center
of
Pressure
Center
of
Gravity
Stowed in a 
SLS Block 2 
8.4 x 27.4-m 
Fairing
C
redit: D
. Jones (N
A
S
A G
S
FC
)
LUVOIR-B
11 June 2018 LUVOIR, SPIE 10698-23, Bolcar, Austin, TX 20
Status Update
• LUVOIR-B originally planned to be a ~9-m on-
axis design
• “Scaled down” version of LUVOIR-A
• Following the yield issues on LUVOIR-A, we 
began to ask whether this design was viable
• Simply scaling by D2, a 15-m with 50 exoEarths
implies a 9-m version would get ~18 exoEarths
• Study team set out to explore a series of trades 
to determine our options
11 June 2018 LUVOIR, SPIE 10698-23, Bolcar, Austin, TX 21
LUVOIR-B Trade Study
11 June 2018 LUVOIR, SPIE 10698-23, Bolcar, Austin, TX 22
Determine minimum 
on-axis primary mirror 
diameter that yields 30 
exoEarths with same 
science capability as 
LUVOIR-A 
Determine minimum on-
axis primary mirror 
diameter that yields 30 
exoEarths with reduced 
science capability 
(e.g. remove UV channel)
Determine feasibility 
of packaging off-axis 
concept in a 5-m 
fairing
Determine 
yields for 
potential off-
axis aperture 
concepts
Present LUVOIR-B 
candidates to STDT
Determine exoEarth
yield for 9-m on-axis 
telescope with same 
science capability as 
LUVOIR-A
Determine off-axis 
aperture size 
breakpoints (vs. 
LV capacity, SM 
separation, 
polarization)
Determine 
minimum LV 
capability needed 
for above aperture.
Determine 
minimum LV 
capability needed 
for above aperture.
Determine 
minimum LV 
capability needed 
for above aperture.
ExoEarth Yields
11 June 2018 LUVOIR, SPIE 10698-23, Bolcar, Austin, TX 23
C
redit: C
. S
tark (S
TS
cI)
LUVOIR-B Trade Study
11 June 2018 LUVOIR, SPIE 10698-23, Bolcar, Austin, TX 24
Determine minimum 
on-axis primary mirror 
diameter that yields 30 
exoEarths with same 
science capability as 
LUVOIR-A 
Determine minimum on-
axis primary mirror 
diameter that yields 30 
exoEarths with reduced 
science capability 
(e.g. remove UV channel)
Determine feasibility 
of packaging off-axis 
concept in a 5-m 
fairing
Determine 
yields for 
potential off-
axis aperture 
concepts
Present LUVOIR-B 
candidates to STDT
Determine exoEarth
yield for 9-m on-axis 
telescope with same 
science capability as 
LUVOIR-A
Determine off-axis 
aperture size 
breakpoints (vs. 
LV capacity, SM 
separation, 
polarization)
Determine 
minimum LV 
capability needed 
for above aperture.
Determine 
minimum LV 
capability needed 
for above aperture.
Determine 
minimum LV 
capability needed 
for above aperture.
9-m on-axis = 
16 exoEarths
11.6-m on-axis 
= 30 exoEarths
10.7-m on-axis 
reduced 
= 30 exoE rths
≤ 8-m off-axis 
feasible
28 
exoEarths
LUVOIR-B Trade Study
11 June 2018 LUVOIR, SPIE 10698-23, Bolcar, Austin, TX 25
Determine minimum 
on-axis primary mirror 
diameter that yields 30 
exoEarths with same 
science capability as 
LUVOIR-A 
Determine minimum on-
axis primary mirror 
diameter that yields 30 
exoEarths with reduced 
science capability 
(e.g. remove UV channel)
Determine feasibility 
of packaging off-axis 
concept in a 5-m 
fairing
Determine 
yields for 
potential off-
axis aperture 
concepts
Present LUVOIR-B 
candidates to STDT
Determine exoEarth
yield for 9-m on-axis 
telescope with same 
science capability as 
LUVOIR-A
Determine off-axis 
aperture size 
breakpoints (vs. 
LV capacity, SM 
separation, 
polarization)
Determine 
minimum LV 
capability needed 
for above aperture.
Determine 
minimum LV 
capability needed 
for above aperture.
Determine 
minimum LV 
capability needed 
for above aperture.
9-m on-axis = 
16 exoEarths
11.6-m on-axis 
= 30 exoEarths
10.7-m on-axis 
reduced 
= 30 exoE rths
≤ 8-m off-axis 
feasible
5-m fairing
> 14 mt lift
>5-m fairing
> 18.5 mt lift
>5-m fairing
> 16.7 mt lift 5-m fairing> 14 mt lift
28 
exoEarths
LUVOIR-B Trade Study
11 June 2018 LUVOIR, SPIE 10698-23, Bolcar, Austin, TX 26
Determine minimum 
on-axis primary mirror 
diameter that yields 30 
exoEarths with same 
science capability as 
LUVOIR-A 
Determine minimum on-
axis primary mirror 
diameter that yields 30 
exoEarths with reduced 
science capability 
(e.g. remove UV channel)
Determine feasibility 
of packaging off-axis 
concept in a 5-m 
fairing
Determine 
yields for 
potential off-
axis aperture 
concepts
Present LUVOIR-B 
candidates to STDT
Determine exoEarth
yield for 9-m on-axis 
telescope with same 
science capability as 
LUVOIR-A
Determine off-axis 
aperture size 
breakpoints (vs. 
LV capacity, SM 
separation, 
polarization)
Determine 
minimum LV 
capability needed 
for above aperture.
Determine 
minimum LV 
capability needed 
for above aperture.
Determine 
minimum LV 
capability needed 
for above aperture.
9-m on-axis = 
16 exoEarths
11.6-m on-axis 
= 30 exoEarths
10.7-m on-axis 
reduced 
= 30 exoE rths
≤ 8-m off-axis 
feasible
5-m fairing
> 14 mt lift
>5-m fairing
> 18.5 mt lift
>5-m fairing
> 16.7 mt lift 5-m fairing> 14 mt lift
28 
exoEarths
Architecture Highlights
11 June 2018 LUVOIR, SPIE 10698-23, Bolcar, Austin, TX 27
8-m Segmented
Unobscured Aperture
Flat, 2-3 Layer
Sunshade
Credit: D. Jones (NASA GSFC)
Architecture Highlights
11 June 2018 LUVOIR, SPIE 10698-23, Bolcar, Austin, TX 28
LUMOS HDI
ECLIPS
Articulating Gimbal
Arm
Credit: D. Jones (NASA GSFC)
11 June 2018 LUVOIR, SPIE 10698-23, Bolcar, Austin, TX 29
Stowed in a 
“Conventional”
5 x 19.8-m 
Fairing
Architecture Highlights
Credit: D. Jones (NASA GSFC)
LUVOIR-B Deployment Sequence
11 June 2018 LUVOIR, SPIE 10698-23, Bolcar, Austin, TX 30
Credit: D. Jones (NASA GSFC)
LUVOIR Instruments:
Extreme Coronagraph for Living 
Planetary Systems (ECLIPS)
11 June 2018 LUVOIR, SPIE 10698-23, Bolcar, Austin, TX 31
ECLIPS Technical Overview
• Three-channel instrument allowing 
simultaneous observation:
• Ultra-Violet (UV) (200 – 525 nm)
• Imaging camera only
• Visible (VIS) (515 nm – 1030 nm)
• Imaging camera + integral field spectrograph (IFS)
• Near Infrared (NIR) (1000 nm – 2000 nm)
• IFS + High-resolution spectrograph (HRS)
11 June 2018 32LUVOIR, SPIE 10698-23, Bolcar, Austin, TX
ECLIPS-A Optical Design
11 June 2018 33LUVOIR, SPIE 10698-23, Bolcar, Austin, TX
Credit: J. Corsetti, Q. Gong (NASA GSFC)
ECLIPS-B Optical Design
11 June 2018 LUVOIR, SPIE 10698-23, Bolcar, Austin, TX 34
Credit: J. Corsetti, Q. Gong (NASA GSFC)
ECLIPS Optical Design
11 June 2018 LUVOIR, SPIE 10698-23, Bolcar, Austin, TX 35
Deformable 
Mirrors
NIR Channel
VIS Channel
UV Channel
C
re
di
t: 
J.
 C
or
se
tti
, Q
. G
on
g 
(N
A
S
A 
G
S
FC
)
ECLIPS Optical Design
11 June 2018 LUVOIR, SPIE 10698-23, Bolcar, Austin, TX 36
Apodizing 
MasksCr
ed
it:
 J
. C
or
se
tti
, Q
. G
on
g 
(N
A
S
A 
G
S
FC
)
ECLIPS Optical Design
11 June 2018 LUVOIR, SPIE 10698-23, Bolcar, Austin, TX 37
Focal 
Plane 
MasksCr
ed
it:
 J
. C
or
se
tti
, Q
. G
on
g 
(N
A
S
A 
G
S
FC
)
ECLIPS Optical Design
11 June 2018 LUVOIR, SPIE 10698-23, Bolcar, Austin, TX 38
Lyot 
StopsCr
ed
it:
 J
. C
or
se
tti
, Q
. G
on
g 
(N
A
S
A 
G
S
FC
)
ECLIPS Optical Design
11 June 2018 LUVOIR, SPIE 10698-23, Bolcar, Austin, TX 39
VIS 
Camera
UV 
Camera
VIS IFS
NIR IFS
NIR HRS
C
redit: J. C
orsetti, Q
. G
ong (N
A
S
A G
S
FC
)
LUVOIR Instruments:
High Definition Imager (HDI)
11 June 2018 LUVOIR, SPIE 10698-23, Bolcar, Austin, TX 40
HDI Technical Overview
• Two channel instrument:
• Overlapping 2’ x 3’ field-of-view
• UVIS (200 nm – 1.0 µm)
• Nyquist sampled at 500 nm
• NIR (~800 nm – 2.1 µm)
• Nyquist sampled at 1.0 µm
• Channel select mechanism allows for 
following modes:
• UVIS channel only
• NIR channel only
• 50/50 beamsplitter
• Dichroic (400-800 nm; 800-1.6µm)
• UV-optimized
11 June 2018 LUVOIR, SPIE 10698-23, Bolcar, Austin, TX 41
HDI-B Optical Design
11 June 2018 LUVOIR, SPIE 10698-23, Bolcar, Austin, TX 42
C
re
di
t: 
G
. W
es
t (
N
A
S
A 
G
S
FC
)
HDI Detectors
• HDI-A
• UV/VIS (UVIS) = 6 x 4 tile of 8k x 8k, 6.5 µm pixels
• 1.6 Gpix, 3.4 mas/pix
• NIR = 6 x 4 array of 4k x 4 k, 10 µm pixels
• 0.4 Gpix, 6.9 mas/pix
• HDI-B
• UVIS = 3 x 2 tile of 8k x 8k, 6.5 µm pixels
• 0.4 Gpix, 6.4 mas/pix
• NIR = 3 x 2 tile of 4k x 4k, 10 µm pixels
• 0.1 Gpix, 12.9 mas/pix
11 June 2018 LUVOIR, SPIE 10698-23, Bolcar, Austin, TX 43
LUVOIR Instruments:
LUVOIR UV Multi-Object 
Spectrograph (LUMOS)
11 June 2018 LUVOIR, SPIE 10698-23, Bolcar, Austin, TX 44
LUMOS Technical Overview
• Two channel instrument:
• 2’ x 2’ UV / VIS multi-object spectrometer using a 
microshutter array at telescope focus 
• Far-UV: 100 – 200 nm
• Near-UV / VIS: 200 – 1000 nm
• 2’ x 2’ Far-UV imager
• Point-source high-resolution spectrograph is 
also include on LUVOIR-B version
• Pollux instrument includes this capability on 
LUVOIR-A
11 June 2018 LUVOIR, SPIE 10698-23, Bolcar, Austin, TX 45
LUMOS Optical Performance
11 June 2018 LUVOIR, SPIE 10698-23, Bolcar, Austin, TX 46
Mode Band (nm) R Angular Res. [mas]
G120M 100-140 44,000 18
G150M 130-170 55,000 19
G180M 160-200 56,000 15
G155L 100-200 13,000 24
G145LL 100-200 ~500 TBD
G300M 200-400 39,000 7
G700M 400-1000 39,000 10
Credit: K. France, B. Fleming (UC Boulder)
LUMOS-B Optical Design
11 June 2018 LUVOIR, SPIE 10698-23, Bolcar, Austin, TX 47
C
redit: K
. France, B
. Flem
ing (U
C
 B
oulder)
Summary
• LUVOIR-A
• Completed a redesign of the optical telescope 
element
• Working on updating instrument opto-mechanical 
designs
• Finalizing other observatory systems
• Spacecraft, thermal management system, etc.
• LUVOIR-B
• Settled on an 8-m off-axis telescope design
• Developing instrument opto-mechanical designs
• Finalizing other observatory systems
• Spacecraft, thermal management systems, etc.
11 June 2018 LUVOIR, SPIE 10698-23, Bolcar, Austin, TX 48
Look Ahead…
• Finalizing engineering designs of both architectures by 
the end of Summer ‘18
• Preparing Concept Maturity Level 4 (CML 4) 
deliverables to NASA HQ in Fall ’18
• CML 4 deliverables due Jan. 2019
• Next spring, one of the two architectures will be costed 
by an external organization
• Final reports due to NASA HQ in June 2019 and to 
NAS in July 2019
11 June 2018 LUVOIR, SPIE 10698-23, Bolcar, Austin, TX 49


The LUVOIR Surveyor: Decadal Mission Concept Update

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