TIPS/JIM
May 20, 2010
Agenda:
INS Division News (Jerry Kriss)
Status of Testing the NIRCam Engineering Test Unit (ETU) (Kailash
Sahu)
Status of Testing the Fine Guidance Sensor ETU (Pierre Chayer)
Overview of the JWST Mission CDR (Massimo Robberto)
Next TIPS/JIM: June 17, 2010
Instruments Division News
05/20/2010
•
•
•
Welcome to Leonardo Ubeda, who recently joined the RIA Branch as a Research and
Instrument Analyst II.
Congratulations to Vera Platais, who was promoted to Research and Instrument
Scientist I, and to Rachel Anderson, who was promoted to Research and Instrument
Analsyst II. Thanks to you both for your exceptional work over the past year.
Congratulations also to Kevin Lindsay, who has transferred from INS to a position in
the Science Software Branch. Thank you, Kevin, for your years of service as an RIA,
and for serving as a chair of the DCRWG.
•
HST news:
o The Cycle 18 TAC is meeting this week. Results will be announced by
June 4, and Phase II reviews are due by July 6.
o Contact Scientist training is being held today, at 1 p.m., in the auditorium.
There will also be future sessions on Bright Object Protection training, to
be organized by Nolan Walborn and the COS+STIS team. The training
materials will also be on line.
•
JWST News:
o JWST passed its mission CDR last month, but with some liens. Massimo
Robberto will be telling us more about this significant milestone event.
o All the instruments are now in various stages of engineering and flight
model integration and test. You’ll hear about NIRCam and the FGS this
morning.
•
Hiring: As we continue to ramp up for JWST, we are adding many more staff to INS
in the coming year. So far we have at least 8 new research staff who will join us over
the next several months:
o Paule Sonnentrucker, ESA, joining us on June 7;
o Anand Sivaramakrishnan, AURA Scientist, arriving July 19;
o Elena Mason, ESA, arriving in early August;
o Dean Hines, AURA Scientist, arriving in September;
o Jennifer Lotz, AURA tenure track, arriving in September;
o Marshall Perrin, AURA tenure track, arriving in September;
o Klaus Pontoppidan, AURA tenure track, arriving Oct/Nov;
o Janice Lee, AURA tenure track, arriving ~July 2011.
Two more offers are still open.
•
Housing: If you look around as you walk through the building, you’ll quickly realize
that we have little to no space for all these new people. In addition to these folks, we
are in the process of recruiting at least 4 more RIAs; OED is also hiring 30 or more
staff. Ray Beaser is looking for additional office space in the area, but in the
meantime, we are going to be squeezed. For at least part of the time, we will need to
double up research staff. My first suggestion will be to ask for volunteers who would
like to share office space for several months. One possible arrangement will be to pair
a new incoming staff member with someone on the team that they will be joining.
This could be a way to help acclimatize the new staff and help with training. I invite
volunteers to get in touch with me.
Let’s continue conversations on how best to do this. I’ll be happy to talk about other
ideas if you want to drop by my office, or send me an email.
•
Jerry will be going on sabbatical this fall, probably in November. A search for a new
INS Division Head will start in early summer. Part of the challenge facing the new
division head will be how to best organize INS as we enter the JWST era. So, start
thinking about this yourselves, and be prepared to offer your inputs.
TIPS/JIM
May 20, 2010
Agenda:
INS Division News (Jerry Kriss)
Status of Testing the NIRCam Engineering Test Unit (ETU) (Kailash
Sahu)
Status of Testing the Fine Guidance Sensor ETU (Pierre Chayer)
Overview of the JWST Mission CDR (Massimo Robberto)
Next TIPS/JIM: June 17, 2010
NIRCam ETU Testing at
LMATC, Palo Alto
Kailash C. Sahu
What’s NIRCam?
•  NIRCam is the near-infrared camera (0.6-5
microns) for JWST
– Dichroic used to split range into short
(0.6-2.3µm) and long (2.4-5µ) sections
– Nyquist sampling at 2 and 4µm
– Coronagraphic capability for both short and
long wavelengths
– Low-resolution spectroscopic capability in
the LW channel.
•  NIRCam is the wavefront sensor
– Must be fully redundant
2 Channels Per Module
–  7 wide band filters (4 SW,
3 LW) for deep surveys
–  Survey efficiency is
increased by observing
the same field at long and
short wavelength
simultaneously
•  Pixel scale:
SW: 0.032”/pix
LW: 0.064”/pix
Module B
•  Each module has two
channels (0.6 to 2.3 µm
and 2.4 to 5 µm)
Module A
Short wavelength channel
2.2’
Long wavelength channel
Light from OTE
Collimator
lens group
Short wave camera
lens group
First fold
Short wave
mirror
fold mirror
Pupil imaging lens
assembly
Dichroic
beamsplitter
Coronagraph
occulting masks
Short wave filter
wheel assembly
Pick-off Mirror
Focus and
alignment
mechanism
Short wave focal
plane housing
Module A
Long wave filter wheel Long wave
assembly
camera lens
group
Long wave focal
plane housing
NIRCam ETU/WFS Testing
•  1-9 April at LMATC (Lockheed Martin
Advanced Techonology Center), Palo Alto
•  First ~3 days (after the “Red Chamber”
attained operating temperature of ~38K)
spent on SCA/Assembly testing, rest on
WFS testing (only with the SW channel).
•  People from STScI:
•  Massimo Robberto,
•  Elizabeth Barker,
•  Kailash Sahu (WIT).
•  George Hartig,
•  Erin Elliot (TEL)
NIRCam ETU/WFS Testing
“First Light”
•  Tests were generally very successful
– Operated with the flight software over eight
Fuzzy because of chamber days with no crashes or major problems
vibrations, tests were done – Wavefront sensing components were
with “pulsed light”
demonstrated to work in the NIRCam pupil
Main problems:
- Transfer of FITS files often needed manual
intervention.
- PIL (Pupil Imaging Lens) had some
alignment problems.
Structure in this image is due to the known
poor alignment of the OMA and ETU at this
early stage.
Weak Lens Images
The shapes are very close to predicted images.
Ghosts are due to reflections in the OMA optics,
not NIRCam
DHS Spectra
Spectra are at the correct
angle.
Known emission line in the
super continuum source being
used for illumination.
A spectrum extracted from the
previous image. The “notches” in
the filter used in series with the
DHS are apparent.
Flat Fields from Internal Red
Chamber Lamps
Detector Linearity from Chamber
Lamp
Data
Sample ramps from
independent exposures
Black: Without linearity correction
Blue: After linearity correction
These data are the first chance we had to check linearity with ASIC + SCA.
Overall linearity is good (better than 5%) and is dominated by SCA, not ASIC.
Some systematic effects at “low” count rates need to be investigated further.
Detector Latency (a) (b)
(c)
(a)  Over-saturated point source image taken during ETU testing.
Estimated counts (from the ghost): 650,000 to 1 million DN.
(b) Exposure taken immediately after (a). Counts at the peak of the point source: ~650 DN (< 0.1%)
(c) Exposure taken ~4 minutes later. Peak counts: ~80 DN. SUMMARY
•  Initial SCA and WFS testing results are very encouraging.
•  The software operated relatively smoothly, but problems
were identified which will be rectified in time for FM testing.
•  Participations from all the groups (GSFC, LMATC, UA and
STScI) were coherent and complimentary.
•  All the ETU Test data are being archived at STScI through
SID archive.
Sample Images from the Focus
Sweeps
These are not organized in any fashion and some were taken at different
wavelengths.
PIL Image of DHS
Blue areas are due to
the missing pieces in
the DHS. Segment
gaps and the
secondary supports
are evident.
TIPS/JIM
May 20, 2010
Agenda:
INS Division News (Jerry Kriss)
Status of Testing the NIRCam Engineering Test Unit (ETU) (Kailash
Sahu)
Status of Testing the Fine Guidance Sensor ETU (Pierre Chayer)
Overview of the JWST Mission CDR (Massimo Robberto)
Next TIPS/JIM: June 17, 2010
JWST Fine Guidance Sensor
Status of Testing the
FGS ETU
Pierre Chayer, André Martel, Kevin Volk,
Sherie Holfeltz, Alex Fullerton, Ed Nelan
May 20, 2010
1
FGS and Optical Telescope Element
Pick-Off Mirror
Focus Mirror
Detectors
100 mm
TMA Mirrors
2m
May 20, 2010
2
FGS Optical Assembly
May 20, 2010
3
FGS Test Configuration
May 20, 2010
4
Optical Ground System Equipment (OGSE)
Adjusting cell &
optical fibers
Al Interface plate Telescope tower
May 20, 2010
Cable support structure
5
OGSE Point Sources
Type 1: 0.8 to 2.5 µm
Type 2: 0.8 to 2.5 µm, ± 40 µm travel
May 20, 2010
6
FGS ETU Test Setup
May 20, 2010
7
FGS Detector Assembly
May 20, 2010
8
FGS ETU
May 20, 2010
9
FGS ETU
May 20, 2010
10
David Florida Laboratory TV3 Chamber
May 20, 2010
11
Cryo-Vac Test Configuration
port 14
(top of chamber)
DFL supplied grounding
wire, fixed to aluminum
base plate
common
grounding bar
B
16 x 16 tent
port 7
(side of chamber)
ports 4 & 5
(lower side of chamber)
FVTS Gro u n d
Eq u ip m e n t Ra ck
DHAS/
Ro se Re m o te
te rm in a l
FVTS Flig h t
Ra ck
unit under test ground
OGSE
Rackmount
EM EU
OGSE co n tro l
ta b le /ESD m a t
Eclip se Clie n t
ETU EU
12 x 12 tent
ITAR Cage
pass thru
opening in wall
TFI
heaters
DCpower
supply
Contam.
Heaters
DCpower
supply
PRD
ESD sensitive area
, ensure all
ThermalChamber
ESD protective measures are
followed within boundry
Facility ESD
ground point
Shelving unit
May 20, 2010
12
Thermal Results Details
May 20, 2010
13
FGS ETU CVAC Plan
•  Focus Sweeps: Best Focus Position.
•  Performance
•  Tracking
•  Fine Guiding
•  Demonstration
•  Acquisition
•  Identification
May 20, 2010
14
Full Frame Image Light Check
For Normal gain, the Big Square is fully saturated on the first frame
and the perimeter is fully saturated by the second frame…
May 20, 2010
15
OGSE On
Raw and CDS(2-1) MOSAIC of OGSE spots.
All spots except for 2-7 visible.
May 20, 2010
16
Acquisition
ACQ2
ACQ 1
May 20, 2010
17
Tracking & Fine Guiding
TRK1
(1863)
FG1
(1864)
May 20, 2010
FG2
(1866)
TRK2
(1865)
18
64x2048 Strip Mosaic
This test produced all 32 strips in the FITS file ok.
May 20, 2010
19
Background level
May 20, 2010
20
TIPS/JIM
May 20, 2010
Agenda:
INS Division News (Jerry Kriss)
Status of Testing the NIRCam Engineering Test Unit (ETU) (Kailash
Sahu)
Status of Testing the Fine Guidance Sensor ETU (Pierre Chayer)
Overview of the JWST Mission CDR (Massimo Robberto)
Next TIPS/JIM: June 17, 2010
JWST Mission CDR Northrop Grumman Space Systems Redondo Beach (CA) April 10‐16, 2010 Recent JWST Milestones Mission CriMcal Design Review: April 2010 OpMcal Telescope Element (OTE) Review: October 2009 Sun shield review: January 2010 Integrated Science Instrument Module (ISIM) Review: March 2009 Mission CDR facts •
•
•
•
6 Days >150 aSendees Non ITAR 45 presentaMons Enormous amount of informaMon on JWST, but… Outstanding Issues (Pre Review) •  Sine vibe notching levels –  Discrepancies between Arianespace and ESA regarding approach to tesMng and analysis with respect to launch vehicle requirements. •  Launch and ascent thermal margins –  Payload temperature changes during launch and ascent. ESA concluded that a fixed a\tude soluMon could be implemented with no performance impact, but it require extra flight programs to account for varying sun angles as a funcMon of launch date. •  OTE actuator life tesMng –  Life test gear motor and actuator used on Primary Mirror Segment Assemblies (PMSAs) and Secondary Mirror Segment Assembly (SMSA) failed prematurely during their life tests. Under invesMgaMon. •  JSC tesMng Mmeline and dynamic test environment –  The current esMmates for the Mme required to complete all cryogenic tesMng exceeds the schedule allocaMon (by a factor of ~2!) and needs to be opMmized –  Add isolaMon into the system for problemaMc test modes Standing Review Board PASS pending resolu-on of the following 1) Iden+fied verifica+on program and risk reduc+on issues 2) Structural margin issues 3) Provide closure plan for all open Request For Ac+ons 4) Complete ac+vi+es related to recovery of Observatory thermal margins 1) Iden+fied verifica+on program and risk reduc+on issues JSC Tests: Current esMmates exceed the schedule for preparaMons, test and de‐preps by about 100 days SoluMons: 1) “selected scope reducMon” 2) “schedule allocaMon increase” 2) Structural margin issues •  JWST too large to be tested deployed: NO END‐TO‐END TEST IS FEASIBLE JWST Deployed Model is validated using a suite of dynamic and structural tests conducted on lower levels of assembly at Element, Subsystem and Component levels. 4) Complete ac+vi+es related to recovery of Observatory thermal margins •  The sizes of the radiators associated with each instrument have been readjusted to beSer balance heat rejecMon margins •  Various sun/thermal shields added to match 50% margin •  Major improvements, i.e. the thermal balance is highly sensiMve to relaMvely small design changes! Final comments •  (JWST) is meeMng all science and engineering requirements for its upcoming mission. •  "The independent team conducMng the review confirmed [that] the designs, hardware and test plans for Webb will deliver the fantasMc capabiliMes always envisioned for NASA's next major space observatory.“ (E. Smith, JWST program scienMst, NASA HQ)