1. SLAC DOE Program Review
Gunther Haller
SLAC
June 13, 07
(650)
SNAP Electronics

2. SNAP Electronics Overview
SuperNova /Acceleration Probe
SLAC Responsibility
Overall Electronics System Engineering
Instrument Control Unit
Control, Monitoring & Readout of
Focal-Plane Electronics
Image Compression & Storage Unit
Telescope
Secondary Mirror Hexapod
Cassegrain Shutters
Calibration Unit
Fine-Guider
Thermal Control of all above
Instrument Software
Spacecraft Interface
Power
Command & Data Handling
Transmission of Science Data to RF Transmitter
Focal Plane with > 500,000 pixels
Instrument Control Unit
Spacecraft
Image Storage
To/from other sub-systems

3. Electronics Functions
Interface to spacecraft (power, control, monitoring, science data transmission)
Control & monitoring off on-board electronics components
Science path
Configuration and readout of detectors
NIR: 36 devices 2kx2k
CCD: 36 devices 3.5kx3.5k
Spectrograph: 2 NIR detectors + 2 CCD’s
Guider: Same as NIR, 4 devices 2kx2k
Integration of NIR and CCD for 300sec followed by 30 sec readout time
Compression (reduction by about factor of 2) of science data
Science data to be stored for one day
About 200 Gbytes (after compression)
Downlink once a day, 3h, at 150 Mb/s rate

4. Electronics Slice-Box Data-Compression and Storage
Instrument Control Unit
Control
Spacecraft
Focalplane Electronics (cold)
Warm Electronics

5. Instrument Control Unit Block Diagram
Control, Monitoring & Readout of entire Instrument Electronics
Focal-Plane Electronics
Image Compression & Storage Unit
Telescope
Secondary Mirror Hexapod
Cassegrain Shutters
Calibration Unit
Fine-Guider
Power, Telemetry, and Science Data Spacecraft Interface
Similar to GLAST
LAT Control Unit

6. Relevant Electronics Expertise at SLAC
Expertise designing and building electronics systems from detector all the way to off-line science processing
Experience designing and building space-flight electronics
Chief electronics engineer for GLAST Large Area Telescope Instrument
Electronics
From initial system and component design to delivering fully space-flight tested instrument
Complete software development and testing
On-board instrument software
Ground instrument and science operations center software
GLAST Observatory March 07