TIPS-JIM Meeting
16 November 2006, 10am, Auditorium
1.
JWST news: ISIM PDR and Technological
Peter Stockman
Readiness
2.
When Drizzle Just Isn’t Enough:
Andy Fruchter
New Method for Band-Limited Imaging
with Undersampled Detectors
3.
Overview of STIS Repair Plans
Charles Proffitt
Next TIPS Meeting will be held on 21 December 2006.
TIPS
Nov. 16, 2006
Peter Stockman
Project Status
o
o
o
The focus of the Project is demonstrating that the “enabling”
technologies are in hand (e.g. they can be manufactured and will pass
the appropriate performance and environment tests.)
The Technology Non-Advocate Review will be held at the end of
January 2007.
Outstanding tests/activities include
o
o
o
o
o
o
Analysis of the backplane stability data (from MSFC and model )
Demonstrating that the WFS&C algorithms work and are sufficient.
Reworking the multi-slit array to survive launch loads
Demonstrating the cyro-cooler technology
The STScI participates in backplane stability testing and advises on the
WFS&C tests.
On other fronts, the Project is basically on schedule for a June 2013
launch.
JWST Technolgy Development - TRL-6 Readiness
T-NAR 30 -31 January 2007
Page 1 of 1
11/3/06
2005
TASK
Oct
Sunshield
Membrane Material Qualification
Test Report
Near InfraredDetector
Focal Plane Assembly
No v
2006
De c
Jan
F eb
M ar
Apr
M ay
Jun
Jul
2007
Aug
Sep
Oct
No v
De c
Jan
F eb
COMPLETE
COMPLETE
COMPLETE
Primary Mirror SegmentAssembly
MidInfrared Detector
Focal Plane Assembly
COMPLETE
Micro Shutter Array for NIRSpec
SIDECAR ASIC
Passive Cryogenic Thermal
Control
HeatSwitchDevelopment
FIne WFS&C
12/15
COMPLETE
11/17
G
12/22
Large Precision Cryo Structure
MIRICryocooler System
Y
Y
Y
12/15
G
PMSA TRL-6 Testing
Acoustic test setup
Sine burst test setup (z-axis)
1/6th backplane segment
116 nm rms
MIRI Dichroic Verification Model
Closed Loop Process
2 pixels
~
M
H
FW
d
Stacke
1/4 Multi-Slit Array
ased
Fine ph
Test Bed Results: 116nm rms
Sunshield Evolutionary Pathfinder (EPF)
Structure
Spine and Clam Shells
Aft Booms Unsplayed
Side Spreader Bar
(Stowed Position )
Beryllium Segment Figure machining @ Axsys
Technologies
PROJECT: JWST
Pathfinde
r
Status as of: 9/30/2006
Pathfinde
r
Done at Axsys!!
PMSA #1 (EDU-A / A1)
Done at Axsys!!
PMSA #2 (6 / B2)
Done at Axsys!!
PMSA #7 (13 / A4)
Done at Axsys!!
PMSA #13 (8 / A3)
PMSA #8 (17 / B5)
PMSA #14 (22 / B7)
Pathfinde
r
Done at Axsys!!
PMSA #3 (7 / C2)
Done at Axsys!!
PMSA #9 (4 / C1)
PMSA #15 (18 / C5)
Done at Axsys!!
PMSA #4 (5 / A2)
Done at Axsys!!
PMSA #10 (16 / A5)
PMSA #16 (19 / A6)
Done at Axsys!!
PMSA #5 (11 / B3)
PMSA #11 (20 / B6)
Done at Axsys!!
PMSA #17 (3 / B1)
(TRL6 PMSA)
Done at Axsys!!
PMSA #6 (12 / C3)
Done at Axsys!!
PMSA #12 (15 / C4)
PMSA #18 (21 / C6)
Secondary Mirror Machining
SM Segment after rough optical surface machining
SM Segment Setup Piece during optical surface machining
SM Segment during finish pocket machining
MIRI & NIRSpec Hardware in Production
MIRI ETU Detector
MIRI ETU Optical Benches
MIRI ETU Filter Wheel
NIRSpec ETU Silicon Carbide Mirrors
NIRSpec Microshutter Array
TRL6 Test Unit
Major Milestones vs Budget
Profile
500
SRR
PDR
T-NAR
450
CDR
Launch
Technologies
Demonstrated
400
Observatory I&T
350
$M
300
Spacecraft Bus
Unencumbered Contingency
Cost Plan w/o Contingency
Sunshield
250
OTE PDR
OTE CDR
OTE I&T
OTE-ISIM
I&T
OTE Structure
200
Primary Mirror Segments
150
PDR
CDR
100
Instrument PDRs
ISIM I&T
ISIM CDR
ISIM PDR
Instrument CDRs
ETU
Instruments
Delivered
50
Flight
Instruments
Delivered
Technology Development
0
FY01
FY02
FY03
FY04
FY05
FY06
FY07
FY08
FY09
FY10
FY11
FY12
FY13
FY14
NOCC
JPL Deep Space Network (DSN)
OTB
Test
Bed
S&OC
R/T
Telemetry / CFDP Msgs
Recorded
Telemetry Files
Developers
Contact Requests /
& I&T
Schedules
Obs Plan Files
Actuator Cmds
Flight
Ops
FOS
Ranging Data
Sci Data Files
Commandos
GSFC
Flight
Dynamics
Facility (FDF)
OP
O
System Engineering /Management
JPL
Telescope
WFSC
Exec
Monitoring
PPS
Planning
Archive
DMS
Data Products
Proposals
Proposer
Public
Ops
OSS
Scripts
PRD Data
Wavefront Image
Data
DSCC
Commands / Loads
Maneuver Plans
Canberra
PRDS
Ephemeris Data
Madrid
Scripts
Acquisition Data
Optics Team
Goldstone
STScI Science & Operations
Center (S&OC)
ISIM Team
NASA Integrated Services Network (NISN)
S-B
an
d
Ka
-B
an
d
Webb @ STScI
STScI Highlights in FY06
o
o
o
o
o
o
o
Agreement on Operations Scripts concept and
beginning of SI script coding/testing
Major optics and software support of backplane testing
at MSFC & primary segment TRL-6 testing
Deliveries of PRDS 1.1,1.2 2.0
S&OC document revisions and closing SRR RIDs
PSF software/Web site
Launch-slip proposal approved
Proposal submitted for Calibration pipeline, Ops
Scripts, Wave-front Executive
Key Upcoming Events/Milestones in FY07
o
Project
o
o
o
o
ISIM PDR (Oct. 24-26)
Partners Workshop (Nov. 28-30)
Technical NAR (Jan. 30-31)
STScI
o
o
o
o
o
o
PRDS 2.4 (Nov. 10)
ROM for SI complexity effort (Nov.-Dec.)
Calibration Error Budget Report (Dec.)
Seattle AAS (Jan. 07)
ETC Prototype (Spring ‘07 for science meeting?)
Tucson Science Meeting (25-28 Sept. ‘07)
ISIM PDR
o
Held on Oct. 24-26, the Project passed the ISIM PDR
with generally flying colors. However there are 60
RFAs that must be addressed before the CDR. Key
issues are
o
o
o
o
o
o
Contamination control plan that addresses venting -- right
now, the only vent is through the telescope entrance and
across the tertiary and steering mirrors that are not heated.
IEC immaturity -- separate IEC PDR scheduled
Independent OSIM and other simulator verifications: how can
we tell where test problems arise?
SI disturbances & effects/Req./Verification plan needed
CPU margins -- too thin right now --dominated by FGS
Fault management allocation/verification -- currently missing
Major FY07 Challenges
o
Preparing for startup of S&OC development in FY08.
o
o
o
o
o
o
Staff size almost doubles between now and FY08-09
Creation of multi-division development teams
Check-list of ops-concepts, requirements, algorithms,
architecture before first SRR (kinda pre-SRRs)
Continued work on internal and external interfaces.
Achieving the proper balance between cost and
science benefits (keeping the S&OC as simple as
possible without sacrificing science)
Working with HST Mission to minimize impact on or by
SM4 preparations
TIPS-JIM Meeting
16 November 2006, 10am, Auditorium
1.
JWST news: ISIM PDR and Technological
Peter Stockman
Readiness
2.
When Drizzle Just Isn’t Enough:
Andy Fruchter
New Method for Band-Limited Imaging
with Undersampled Detectors
3.
Overview of STIS Repair Plans
Charles Proffitt
Next TIPS Meeting will be held on 21 December 2006.
Band-limited Imaging
with Undersampled
Detectors
Andy Fruchter
TIPS -- 11/16/06
Drizzle: The Pictorial
Alas -- Drizzle is not
Perfect
Relative photometry is very stable -- but
aperture correction depends on Drizzle
parameters
Exact PSF depends not only on parameters
but also sub-pixel phase of input pixels
Noise in output image is correlated
Power Spectrum of WFPC2 PSF
Telescope images are band-limited
But:
Drizzle does not use the band limit
http://www.math.ucdavis.edu/~strohmer/
Tutorial by Tobias Werther (NUHAG)
see http://www.math.ucdavis.edu/~strohmer/
The Idea
Use Drizzle instead of Voronoi approximation
Drizzle provides statistical weighting of input
points
Iteration should effectively remove
convolution with pixfrac and scale
The Result
`
Drizzle
Iteration
Iteration
Iteration
Iteration
Iteration
Iteration
1
2
3
6
12
24
Peak
Peak
Peak
Peak
Peak
Peak
Peak
Error
Error
Error
Error
Error
Error
Error
= 1494
= 519
= 289
= 183
=
97
=
76
=
73
WFPC2 + Noise
The Pros
Method can handle arbitrary dithers,
distortions and missing data (nothing new ;-)
Reconstructs images with extraordinary
fidelity
Provides a powerful new mechanism for
observationally deriving PSFs
Can be performed with a 100 line Pyraf
script.
The Cons
New method requires sufficient number of
images (and appropriate positioning) so that
the image plane is (nearly) Nyquist sampled
Speed of convergence depends on quality of
sub-pixel sampling
Output image is slightly (∼ 10%) noisier than
the Drizzled image
The “Point” of the
Exercise
In the presence of temporal or spatial
stability provides extremely powerful method
of determining point spread function.
JWST should have reasonable temporal
stability
Procedure:
Drizzle onto oversampled image
Fourier transform drizzled image and then
mask higher frequencies
Inverse FT image, add to continuing sum, and
blot back to positions of original input images
Subtract from blotted images and repeat
After iterations complete -- resample to final
?
?
?
Real Data: The UDF
Real Data II
TIPS-JIM Meeting
16 November 2006, 10am, Auditorium
1.
JWST news: ISIM PDR and Technological
Peter Stockman
Readiness
2.
When Drizzle Just Isn’t Enough:
Andy Fruchter
New Method for Band-Limited Imaging
with Undersampled Detectors
3.
Overview of STIS Repair Plans
Charles Proffitt
Next TIPS Meeting will be held on 21 December 2006.
Overview of STIS Repair Plans
Charles R. Proffitt
November 16, 2006
11/15/2006
STIS History


Installed during SM2, Feb 14, 1997
Side 1 Failed May 16, 2001 (after ~ 4.5 yrs)




Short across power input leads
Probably failed tantalum capacitor
Side 1 electronics not accessible w/o removing STIS
Side 2 failed Aug 3, 2004 (after ~ 3 yrs)





Interpoint converter in low voltage power supply failed
Supplied power to most instrument mechanisms aperture wheel, MSM, CCD shutter, etc.
Can’t get light to the detectors
Need to replace LVPS2 card in MEB1
Can be accessed w/o removing STIS
STIS Repair TIPS Presentation
Nov 16, 2006
44
STIS in HST with Location of MEB
+V2
NICMOS
STIS
MEB
Cover
NCC
STIS Repair TIPS Presentation
Nov 16, 2006
45
STIS
+V3
Side
MEB-2
Flight STIS Instrument
+V2
Side
MEB-1
EVA
Handle
L-Handle
MEB Cover
Extension
STIS Closeup
MEB-1
Cover
MEB Cover
Extension
Clamp
STIS Repair TIPS Presentation
Nov 16, 2006
46
STIS Main Electronics Box (MEB)
LVPS-2
LVPS2 Board (Engineering Unit)
MEB1 with Cover Removed
STIS Repair TIPS Presentation
Nov 16, 2006
MEB Structure (non-flight)
47
LVPS-2 Interfaces

Circuit board LVPS-2 has 3 main functions

Supply Heater Power


Supply Calibration Lamp Power


+30 volts to Calibration Lamp Controller
Supply Mechanism Power




+15 volts to Thermal Control Zone A and B
+5 volts to Mechanism Optical Coupler
+15 volts to Mechanism Drivers
+30 Volts to Mechanism motors
LVPS-2R will connect to MEB motherboard
STIS Repair TIPS Presentation
Nov 16, 2006
48
Functional Overview of Repair
Major activities to be performed to repair STIS













HST +V2
STIS Repair TIPS Presentation
Open the +V2 Aft Shroud doors
Remove STIS EVA Handrail
Remove MEB Cover Clamp
Install the Fastener Capture Plate (FCP) Tool
Release MEB cover fasteners (111)
Remove MEB Cover and FCP Tool
Remove failed LVPS-2 board
Install replacement LVPS-2R board
Install replacement MEB cover
Perform Aliveness Test
Install the STIS Thermal Interface Kit (STIK)
Install the STIK Radiator (STIKER)
Close the +V2 Aft Shroud doors
Nov 16, 2006
49
EVA Timeline

Goal from STIS Repair SRR was to get STIS repair and
cooling to fit in one EVA day.
STIS Repair TIPS Presentation
Nov 16, 2006
50
STIS Repair - NBL 06.2 Images
STIS Repair TIPS Presentation
Nov 16, 2006
51
STIS Aliveness Test
(This is when we find out if it worked)

To be conducted during EVA

Verify connectivity of LVPS-2R board to MEB motherboard.
Ensure that major functions of LVPS-2R all work





Less Than 10 minutes in duration.


Verify heaters enabled
Enable SES telemetry collection
Enable (close) mechanism and lamp relays and verify output voltages
Macro started at beginning of test will ensure auto-shutdown
Isolate any failure to specific pin.
STIS Repair TIPS Presentation
Nov 16, 2006
52
Cooling System (SCS) Overview STIS



The STIS Cooling System (SCS) is intended to conduct heat away
from the MAMA detector radiator and radiate it into the aftshroud.
Evolved from the STIK interface to the Aft Shroud Cooling
System
Three part assembly:



SCS Mounting Bracket (SMB)
The STIS Thermal Interface Kit (STIK

An actuator forces STIK pressure plate
against STIS radiator

Soft thermal interface material on the
pressure plate conducts heat to heat
pipes.
The STIK Extended Radiator (STIKER)

Spreader heat pipes on the STIKER
conduct and radiate heat away from
the instrument.
NICMOS
STIS
STIK Support
Bracket
NCC
STIKER
STIS Repair TIPS Presentation
Nov 16, 2006
53
Why install the SCS?





Without SCS would expect a significant increase in
MAMA tube temperature over previous side-2 values (~
4 C).
Substantial increase in MAMA dark rates
New temperature regime for detectors
SCS should keep tube temperatures ~ 2 C lower than
were seen in 2003-2004.
Should reduce MAMA detector dark currents.
STIS Repair TIPS Presentation
Nov 16, 2006
54
Challenges of STIS Repair

STIS repair requires a whole EVA


Removal of 111 MEB Cover Fasteners



Tolerances very tight, need all active pins to connect
Need enough force to engage pins, but not enough to break anything
Debris generated by fastener, cover plate, and card removal


Card Locks may stick - studies indicate card can be removed anyway
Insertion of LVPS-2R


RFI gasket
Removal of LVPS-2 card


Need to be prepared to handle stripped or jammed fasteners
Removal of MEB cover


If fewer EVAs than expected are available, STIS repair will be the first
thing deleted!
Determined to be within acceptable limits
HST PCS analysis of SCS Jitter and STIKER mass control ongoing

Failed SCS installation could cause jitter.
STIS Repair TIPS Presentation
Nov 16, 2006
55
Status after PDR


Hardware shown to meet requirements
NBL tests successfully demonstrated execution of STIS Repair
with high-fidelity hardware





10 successful completions of LVPS-2 change-out
2 successful completions of SCS installation
Extensive testing and analysis performed to show compliance
with HST Contamination requirements
Test results for high-risk tasks (Card Extraction and Insertion)
and resulting requirements
The STIS Repair Team has defined and implemented plans,
processes, tools, and has in place the organization to proceed to
CDR (January 2007).
STIS Repair TIPS Presentation
Nov 16, 2006
56
STIS Repair Top-level Schedule
STIS Repair TIPS Presentation
Nov 16, 2006
57
TIPS-JIM Meeting
16 November 2006, 10am, Auditorium
1.
JWST news: ISIM PDR and Technological
Peter Stockman
Readiness
2.
When Drizzle Just Isn’t Enough:
Andy Fruchter
New Method for Band-Limited Imaging
with Undersampled Detectors
3.
Overview of STIS Repair Plans
Charles Proffitt
Next TIPS Meeting will be held on 21 December 2006.