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EUSO Calibration

EUSO Calibration. M.Teshima MPI for Physics, Munich EUSO meeting@June2003, Palermo. Category. Pre-flight calibration Device to device calibration Shower simulator LED array + driver? On-board calibration LED/Laser High stability and long life Limited power / mass / size

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EUSO Calibration

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  1. EUSO Calibration M.Teshima MPI for Physics, Munich EUSO meeting@June2003, Palermo

  2. Category • Pre-flight calibration • Device to device calibration • Shower simulator LED array + driver? • On-board calibration • LED/Laser • High stability and long life • Limited power / mass / size • Atmospheric calibration / shower simulator • Ground Light source flasher / LIDAR on ground • IR CCD cameras • On-board LIDAR  LIDAR sub-group

  3. calibrations Lens transmittance Filter transmittance Collection efficiency FE Electronics Atmospheric transmittance Factor from point spread function Entrance Pupil Quantum efficiency

  4. Pre-flight calibration

  5. On-board calibration

  6. Light source I

  7. MASS/POWER

  8. Grey surface Teflon sheet (~a few %) LED array LID Another calibration scheme

  9. Threshold scan

  10. What we need to measure/know • Measure counting rate  Transmittance x Q.E. • as a function of light source intensity • Count(L1), Count(L2), Count(L3), and Count (dark) • Pixel unit (counting efficiency) • 8bits coding/pix  2.5Mbits • 2bits coding/pix  0.6Mbits • Hot pix / Dead pix +50% / -50% in counting efficiency • Macro-cell unit (100units) • Counting efficiency • Average, variance  < 4Kbits • Detail monitoring on randomly chosen pix / macro-cell • ~100 pixels /orbit  detail calibration for ~1% area/day  1Mbits • Regular measurement (monthly….) • More detail measurement

  11. IR, UV-optical CCD camera • IR ccd camera ( InSb 8-14μm) • 256ch x 256ch  0.2 deg x 0.2deg • 128kbytes/picture  <50kbytes/pic in jpeg • Capture rate <10pics/orbit  5Mbits • Random capture + EECR trigger capture • Exposure 1/30sec  optimization • 1.8kg, 12W  5kg, 20W • UV-optical CCD camera • TV quality (400 lines) • Mass / power • Capture rate?

  12. Ground LIDAR / Shower simulatorWe do not need to care the power / mass We can know light intensity In each points. 50mJ Nd:YAG 3rd Ground Light Source Hamamatsu L6604 10~20 x LIDAR station

  13. GLS (Flasher) Light Spot Easy to operate

  14. GLS (Ground Lidar) Simulate Shower track Check the angle Determination 1m diameter mirrors 50mJ laser

  15. Akeno Lidar System

  16. Sample of observations

  17. LIDARfor MAGIC. Nd:Yag passive locked laser: 2 µJ per Pulse, ~0.5 ns FWHM, rate up to 3 kHz, 2nd harmonic @532 nm. Light sensor module: PMT R7400P + amplifier + a system of lenses + interference filter (3 nm) + adjustable diaphragm Elevation angle shaft encoder, 14 bit Elevation stepping motor + gear box Massive Al mirror, diamond polished, 50 cm diameter, F/3

  18. Photon detector • Soon we will use a Hamamatsu hybrid PMT with GaAsP photocathode instead of the usual bialkali PMT. The QE will increase ~8 times: bialkali PMT QE ~ 5 % & hybrid PMT QE ~ 40 % @532nm (the LIDAR operating range will increase by more than 2.5 times).

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