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EUSO Calibration Concept. Absolute Ground Calibration of entire instrument completed prior to launch In-flight calibration/monitored with LED array mounted on inside cover of shutter FOV measured by raster scans with LIDAR

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euso calibration concept
EUSO Calibration Concept
  • Absolute Ground Calibration of entire instrument completed prior to launch
  • In-flight calibration/monitored with LED array mounted on inside cover of shutter
  • FOV measured by raster scans with LIDAR
  • Atmospheric Corrections for individual events determined through near-realtime LIDAR Trace
  • In-situ light source (UV-GLS) for absolute UV photon number calibration
uv ground light source
UV Ground Light Source
  • Provide calibration data to confirm signal losses in the atmosphere
  • 3 versions:
    • Air-borne Module: mounted on dedicated airplane flights for EUSO
    • Serviced Module: Units located at specific places that can provide power and communication links (i.e. observatories etc…)
    • Stand-alone Module: Distributed at key locations where access/power/telemetry may not be available
uv gls flux estimate
UV-GLS flux estimate

Energy output density per flash: 0.003 J/cm2-nm @ distance of 0.5m

Useful band width (300-400nm): 100 nm

Useful Energy output per flash: 0.3 J/cm2 @ distance of 0.5 m

Reduction in signal by distance: (0.5m/400,000m)2 = 1.610-12

Energy per flash reaching EUSO: 4.710-19 J/cm2 @ distance of 400 km

Photons per flash at EUSO: 4.7x10-19/5.710-19 = 0.8 /cm2

EUSO collector 2m dia. 3.14104 cm2

Photons in EUSO FOV per flash: 0.831.4103 = 2.610 4’s

Transmission loss through lens/filter 50%

Transmission loss through atmosphere 50%

PMT quantum efficiency 20%

Total losses: 95%

Photo electrons: 2.6104  0.05 = 1300 p.e.s./per flash

uv gls development costs
UV-GLS Development Costs

Unmanned Serviced Air-borne

1)  CPU $400 $400 $400

2)      ADC $250 $250 $500

3)     Enclosure $150 $150 $500

4)     Flash lamp $500 $1500(3) $1950(3)

5)     Trigger circuit $180 $540(3) $750(3)

6)     HV-supply $575 $1725(3) $2250(3)

7)     Cooling Shield $245 $735(3) $1020(3)

8)     Capacitor $230 $690(3) $870(3)

9)     Diffuser $250 $750(3) $750(3)

10)  Filter $10 $350(3) $350(3)

11) Photo-diode $100 $100 $100

12)  Power supply $250 $250 $250

13)  Light Sensor $25 $25

14)  Solar array $250 $250

15)  Battery $50 $50

  Sub-Total $3480($2500) $7465($4000) $9690

Other Development Costs:

CCD system $7500

Test setup $10,000

Stage $5000

Technician (1yr) $50,000

Sub-Total $72,500

air borne moduledeployment
Air-Borne ModuleDeployment

Plane: P3BTwin Otter

Platform: 16” diameter turret on top of fuselage must make adapter

Altitude: 20-25 kft ( 6-7.5 km) 20 kft maximum

Duration: 8-10 hrs

Speed: 300 knots

Range: 300 miles

Initial costs: $15,000 $15,000

Flight rate: $3000/hr ($7000/hr full cost) $1100/hr ($1700 full)

Travel: for airfields other than Wallops, contractor travel and overtime

candidate ground base locations
Candidate Ground Base Locations

1) Mauna Kea, Hi 20oN 4.1 km

2) Mt. Fowlkes, Tx 31oN 2.1 km

3) Mt. Hopkins, Az 32oN 2.6 km

4) Mt. Palormar, Ca 33oN 1.9 km

5) Nizhny Arkhyz, Russia 43oN 2.1 km

6) Coonabararan, Australia 31oS ? km

7) Cerro La Salle Chile 29oS 2.4 km

8) La Palma, Canary Is. 29oN 2.4 km

9) Calar Alto, Spain 37oN 2.2 km

10) Jelm Mtn., Wyoming 41oN 2.9 km

11) Hemle, India ~30oN 4.2 km

Sea Level: your favorite dark vacation spot