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Science Specification Table
• 12 keV - 250 keV for neutral particles
• 40.5 cm2 image plane
• Electronic Noise 3 keV FWHM
• Proton Dead Layer <3 keV
• Focal Length 6.16 to 6.95 cm
• FOV 40 degrees
• Pixel size 4 x 4 mm
• 256 Energy Levels (10 Bit A/D)
Taylor University HENA CDR July 9 &10 1997
Engineering Specification Table
• Sensors: XY Position Si solid state sensors
– Two vendors used: Micron and Canberra
• Analog Electronics 250 A225 preamplifiers 16 ASIC amplifiers
• ? Total Power 3 Watts (at supply voltages)
• Voltages +/-3.5, +/-5, and bias voltage (-70V)
• Planned Temperature Operation 10o C +- 20o C
• Survival Temperature: +60oC, -50oC
• ? Mass 3.53 kg (estimated)
• ? Dimensions 7.62 x 22.35 x 24.13 cm
Taylor University HENA CDR July 9 & 10 1997
SENSOR SPECIFICATIONS
• MEASURES NEUTRALS E>12 keV
• 4 - 60 ELEMENT ARRAY (12 X 5)
• ACTIVE AREA: 48.7mm x 20.8mm per SSD
• THICKNESS: >200 MICRONS
• THIN WINDOW: <5keV H+ ENERGY LOSS (Si)
• BIAS APPLIED TO THIN WINDOW SIDE OPPOSITE PIXELS
• LEAKAGE CURENT: <10nA
• ELECTRONIC NOISE RESOLUTION: <1KeV FWHM
• BOND PADS: 4 - 5 MILS
• BOND WIRES: < 1.25 MILS
Taylor University HENA CDR July 9 & 10 1997
SSD Design Features
• Parallel processing (240 channels)
• High resolution (240 pixel array @ 256 Energy levels)
• Low Power
• Single Box Assembly
Taylor University HENA CDR July 9 & 10 1997
System Design
Taylor University HENA CDR July 9 & 10 1997
Weight Breakdown• Middle Box .93 kg (cal.)• Radiation Shielding (outside walls = .23 in.) .7 kg (est.)• ? 240 A225 Preamps (SIP package) ? .94 kg (mes.)• 16 ASICs .12 kg (mes.)• 4 PC Board and MDM connectors .24 kg (cal.)• SSD Assembly .15 kg (cal.)• Processing Boards .21 kg (cal.)• Misc parts (screws, connectors) .2 kg (est.)
Total 3.13 kg
Taylor University HENA CDR July 9 & 10 1997
Design Philosophy
• Use Existing Technology
• Use Well Proven Analog Gate Array Technology
– High reliability, Parallel Processing, Low Power, and Low Complexity
• Rigorous Testing and Burn-In of Subsystems
• State-of-the-Art Instrument
Taylor University HENA CDR July 9 & 10 1997
SSD Sensor Heritage
• SSD Sensors
– SEPS (Source Loss/Cone Energetic Particle Spectrometer flew in the winter of 95’. It’s mission was to study energetic electrons, ions, and neutrals in the source loss cone.
– MAXIE (Magnetospheric Atmosphere X-Ray Imaging Experiment) flew on Aug. 9, 1993 on the TIROS satellite. It measured x-rays in the range of 4 - 100 keV.
Taylor University HENA CDR July 9 & 10 1997
POLAR Satellite
SEPS
SPADUS
HENA Middle Box Cross Section
Taylor University HENA CDR July 9 & 10 1997
HENA Middle Box Design
Taylor University HENA CDR July 9 & 10 1997
Middle Box Assembly Renderings
Taylor University HENA CDR July 9 & 10 1997
DPU Connection
SSD Assembly
MCPSSD
Shield
SSD Mount
?Middle Box Mass Properties
Taylor University HENA CDR July 9 & 10 1997
---------------- SOLIDS ----------------
Mass: 36.1353Volume: 36.1353Bounding box: X: 0.5000 -- 10.0000 Y: 0.5000 -- 9.3000 Z: 0.0000 -- 2.9500Centroid: X: 5.2705 Y: 4.7628 Z: 1.5714Moments of inertia: X: 1286.4188 Y: 1534.5287 Z: 2583.1441Products of inertia: XY: 906.6895 YZ: 270.5600 ZX: 299.2255Radii of gyration: X: 5.9666 Y: 6.5166 Z: 8.4549Principal moments and X-Y-Z directions about centroid: I: 377.4822 along [1.0000 -0.0062 -0.0002] J: 441.5144 along [0.0062 1.0000 0.0003] K: 759.6615 along [0.0002 -0.0003 1.0000]