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 TarléProfessor of Physics, University of MichiganResearch Focus: Particle

Astrophysics/CosmologyCurrent Research: Dark Energy (SNAP and

DES), Cosmic Rays (CREST)Past Research: MACRO, HEAT…

Supernova / Acceleration Probe

A large wide-field space telescopewith a 0.6 Gpixel visible/NIR imager anda 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.

• 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.

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

Wolfgang LorenzonPrecision

Photometry

Shawn McKeeSimulation Software

Tools

Gregory TarléSNAP NIR Coordinator

UM Task Leader

Tim McKay Auxiliary Science

Dave GerdesScience Simulations

Thomasz BiesiadzinskiDetector

and Cosmology Simulations

Michael SchubnellUM Lab Coordinator

Data Analysis

Graduate StudentsProfessional Staff

Faculty

Research Scientists

Undergraduate Students

Curtis WeaverdyckNIR Lab Eng.

Bob NewmannAnastasiaKarabina

Thomas ZurbuchenElectronics

Steven RogackiSIDECAR

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

Michigan NIR Laboratory Calibrated Flat-field Illuminator

ESD safeenvironment

Spot-o-Matic

Quantum Efficiency setupDewar #1

Readout electronics

Dewar #2

Power supply and temp. controller

Coordinated by Michael Schubnell

Equipment developed mostly by students

The Michigan NIR Detector Lab

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 HallerSNAP Electronics System Manager

Roger BlandfordDirector of KIPAC

Kevin ReilStaff Physicist

SNAP star tracker

Leonid SapozhnikovEngineer

SNAP DAQ hardware

Sergio MaldonadoEngineer

SNAP DAQ software

Dave TarkingtonEngineer

SNAP Elect./Mech.

Aaron RoodmanGroup Leader

Dave NelsonEngineer

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)

SLAC

UM

SIDECAR

Adapter Board (SLAC)

cPCI crate

Instrument Communication Board (SLAC)

cPCI MCP750 processor

SLAC

EGSE Provided by 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 real-time 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.