SuperNova/Acceleration Probe
L
U
O
SLAC User’s Organization Meeting
“Redefining the User Facility”
February 7, 2008
Gregory Tarlé
University of Michigan
A New Type of SLAC User
Gregory Tarlé
Professor of Physics, University of Michigan
Research Focus: Particle
Astrophysics/Cosmology
Current Research: Dark Energy (SNAP and
DES), Cosmic Rays (CREST)
Past Research: MACRO, HEAT…
Supernova / Acceleration Probe
• Use type Ia SNe as standard candles to measure expansion
history of the Universe over 2/3 of the age of the Universe.
• Complementary Weak Lensing survey will measure the growth
of structure probing the competition the competition between
Matter and DE.
A large wide-field space telescope
with a 0.6 Gpixel visible/NIR imager and
a visible/NIR spectrograph will provide:
• A much larger statistical sample of supernovae (2000 SNe with 50 SNe/0.03 z).
• Much better controlled systematic errors (1 – 2%).
• A much larger range of redshifts (out to z = 1.7) than can be obtained with any other existing
or planned instrument.
SNAP NIR Program
• NIR Project Lead: G. Tarlé
• Participating Institutions: Caltech, GSFC, IU, JPL,
RIT, UM
• Procure 36 Science Grade Flight NIR detectors
meeting SNAP science requirements.
• Procure FE electronics for above (SIDECAR)
• Characterize and calibrate flight NIR detectors
• Teledyne Imaging Sensors (TIS) has emerged as
the leader for manufacture of large format SWIR
HgCdTe Focal Plane Arrays.
The Michigan
SNAP Group
Faculty
Gregory Tarlé
SNAP NIR Coordinator
UM Task Leader
Research Scientists
Dave Gerdes
Science Simulations
Tim McKay
Auxiliary Science
Michael Schubnell
UM Lab Coordinator
Data Analysis
Wolfgang Lorenzon
Precision
Photometry
Professional Staff
Curtis Weaverdyck
NIR Lab Eng.
Steven Rogacki
SIDECAR
Shawn McKee
Simulation Software
Tools
Thomas Zurbuchen
Electronics
Graduate
Students
Thomasz Biesiadzinski
Detector
and Cosmology
Simulations
Undergraduate
Students
Anastasia
Karabina
Bob Newmann
Resources at UM available to
SNAP
• UM Physics shared facilities:
– Electronics shop (1 engineer + students)
– Mechanical shop (2 machinists)
• UM Space Physics Research Lab (SPRL)
shared facilities.
– Clean room
– ~dozen engineers, managers w/space flight
expertise
The Michigan NIR Detector Lab
Quantum
Efficiency
setup
Dewar #1
Michigan NIR Laboratory
Calibrated
Flat-field
Illuminator
ESD safe
environment
Readout
electronics
Dewar #2
Spot-o-Matic
Power supply
and temp.
controller
Coordinated by Michael Schubnell
Equipment developed mostly by students
Towards SNAP Science Grade
Detectors
• SNAP NIR in excellent shape; performance of NIR detectors
better or as good as required at beginning of R&D.
• Latest Teledyne detector lots promising
• Goal:
• produce ‘home run’ science grade device based on optimized
recipe (high QE and very low noise)
• 12 layers grown successfully. Four
looking very promising (PEC results)
– Hybrids from lot 4 and lot 5 are
being packaged (SNAP SiC
flight package)
– Expect new devices delivered in
March 2008
• Space version of FE electronics under
development
Our SNAP Collaborators at SLAC
Gunther Haller
SNAP Electronics Roger Blandford
Aaron
Roodman System Manager Director of KIPAC
Group Leader
Dave Nelson
Engineer
SNAP
Elect./Mech.
Kevin Reil
Dave Tarkington
Staff Physicist Leonid Sapozhnikov Sergio Maldonado
Engineer
Engineer
Engineer
SNAP star tracker
SNAP DAQ hardwareSNAP DAQ software SNAP Elect./Mech.
SIDECAR
• Teledyne has developed a read-out ASIC (SIDECAR), specifically designed for use
with the H2RG multiplexer (ROIC for 2k x 2k FPAs). This ASIC is designed to
handle the clocking, biasing and read-out of all 32 channels of our HgCdTe FPAs.
• SIDECAR electronics under evaluation at UM and SLAC
• UM: Supported by SPRL @ UM (Prof. Thomas Zurbuchen and Steve Rogacki (engineer)).
Established functionality and read-out of cold detector (w/ warm Teledyne SIDECAR
Development Kit (SDK))
• SLAC: Gunther Haller’s group, as part of the SNAP electronics effort developed EGSE
and DAQ. Replaced Teledyne interface and (JADE card) and DAQ with documented open
system with easily modifiable software. (1 unit to UM by Feb 2008)
UM
SLAC
EGSE Provided by SLAC
SIDECAR
Adapter Board
(SLAC)
cPCI crate
Instrument
Communication
Board (SLAC)
cPCI MCP750
processor
SLAC
EGSE DAQ Provided by SLAC
• Linux host client connects to EGSE crate
– Ethernet TCP/IP sockets
• User Interface on Linux host
–
–
–
–
–
–
–
–
–
Python shell API or PyQt graphical application
SIDECAR acquisition controls
CRIC acquisition controls
ICU controls and settings
Configuration upload and dump
Image upload and dump
Telemetry display
Message logging
SAO DS9 integration
• Python command line API or PyQt graphical application provides realtime configuration and control of ICU and Sidecar/CRIC front ends
• File based Sidecar front end configuration executed via Ethernet load
• System commanding and telemetry uses CCSDS protocol over
Ethernet
• Python shell API supports integration with offline analysis utilities
• PyQt graphical application provides interactive system control
SLAC Support for SNAP
• Development of tracker (fine guider) using 4k
x 4k HyViSi FPA.
• Instrument Control Unit
• EGSE setups for Caltech, Teledyne, French
spectrograph group, I&T site…
• Software support, modifications to optimize
performance of detectors.
• CCD imager ASICs
Future Possibilities for SLAC
Participation/Support for SNAP
•
•
•
•
Electronics Engineering expertise
Mechanical Engineering expertise
Experienced space qualified technicians
Computing support - SLAC experience
with large datasets/database
• Analysis pipeline
Conclusions
• Although LBNL is the lead DoE laboratory on
SNAP, SLAC has a vital role to play.
• SLAC is already proving to be a valuable partner
in SNAP through the development of flight
electronics and software.
• SLAC is an ideal partner for university groups
that do not have the facilities and experienced
manpower present at SLAC.
• As a new type of SLAC user, I am extremely
grateful for SLAC participation in SNAP and their
contributions to the NIR program.
• I hope/expect that the association of the SNAP
NIR group and SLAC will continue to grow.