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S. E. Tzamarias Hellenic Open University

S. E. Tzamarias Hellenic Open University. N eutrino E xtended S ubmarine T elescope with O ceanographic R esearch Readout Electronics DAQ & Calibration. NESTOR TOWER. Hamamatsu PMT R2018-03 (15”) Benthos spheres μ- metal cage power supply. Single p.e. conditions.

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S. E. Tzamarias Hellenic Open University

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  1. S. E. Tzamarias Hellenic Open University Neutrino Extended Submarine Telescope with Oceanographic Research Readout Electronics DAQ & Calibration

  2. NESTOR TOWER

  3. Hamamatsu PMT R2018-03 (15”) • Benthos spheres • μ-metal cage • power supply Single p.e. conditions The Detector

  4. ReadOut Electronics & DAQ Chain

  5. House Keeping Board PMT control  Calibration Beakon control  PMT HV monitor  Power Supply monitors  Environmental monitors Floor Board PMT pulse sensing  Majority logic event triggering  Single & coincidence rate scaling  Waveform capture & digitization  Data formatting & transmission  FPGA & PLD reprogramming Shore Laboratory Signal transmission & Control Power supply PMT signal transmission low voltage supply (24V) control and monitoring signal transmission Ti-Sphere Electronics

  6. Floor Board PMT pulse sensing  Majority logic event triggering  Single & coincidence rate scaling  Waveform capture & digitization  Data formatting & transmission  FPGA & PLD reprogramming Input: 12 PMT signals Delay lines Configuration parameters PLD PMT Signal Capture & Digitization 5 ATWDs Trigger Logic & Communication FPGAs

  7. 20m 20m The LED Calibration System Frequency Duration Light amplitude • Gain monitoring • Timing • Free running Calibration Trigger • Adjustable Trigger frequency • Adjustable LED’s light output

  8. Extensive Lab tests On single p.e. conditions LED Calibration Run Pulse Height (mV) Relative timing Time Difference in PMTs Response L.E.D. Reference Time (ns) Detector Preparation Calibration at the Lab

  9. Amplitude Frequency (MHz) Fourier Transform-Comparison Phase (rad) Frequency (MHz) Detector Preparation Attenuation Correction Reference waveform Electronic delay lines and amplifier Coaxial cable

  10. LED Angular Profile Laboratory measurements Estimated Angular Profile of the LED emission in water Number of P.E.s / sr /Light Pulse Parameterized Angular Profile of the LED emission in air PMT Geometrical Factor: 3.46 ·10-4 Transmission Factor: 0.72 Angle (Degrees)

  11. Delete Data Storage Data Files Offline fast analysis Event samples Monitor DAQ Architecture to the floor board

  12. Online Software Shore Board Downloads the FPGAs & PLD of the Floor Board  Broadcasts the 40Mhz clock  Receives Data from the Floor Board  Transmits Data to the Run Control System

  13. Event samples Monitor Real Time Monitor • Environmental • Thermometers • Hygrometers • Compass • Inclinometer/Accelerometer • Pressure meter • Electrical • PMT High Voltage etc • Digitization & DAQ Performance • Digitized waveforms • PMT rates • Trigger rates • DAQ status

  14. 448 ns Real Time Monitors Sample

  15. During deployment

  16. Voltage (mV) Rise Time 16 ns 9 ns Double pulse separation Time (ns) Before the F.F.T. and the attenuation corrections After the F.F.T. and the attenuation corrections Waveform Reconstruction Offset (ADC counts) Sample Sample Offset (ADC counts)

  17. Waveform Reconstruction Data Quality Histograms Hit Definition DST Production Event by Event Sampling Interval Variation (Constant Temperature) RMS=0.006 ns 40 MHz Clock Waveform Capture Software to Hardware Trigger Time Difference (arbitrary time offset) ADC Counts σ=0.7ns Sample Time (ns)

  18. Data from a depth of 4000 m Calibration using the natural radiactivity (K40) Calibration single p.e. LED Run single p.e. pulse height distribution two p.e.s pulse height distribution dark current pulse height distribution sum of the above

  19. <Δt>: 0.6 ± 0.1 ns σ : 3.3 ± 0.1 ns Number of Events Time Difference (ns) Number of Events <Δt>: 0.2 ± 0.1 ns σ : 3.3 ± 0.1 ns Time Difference (ns) Data from a depth of 4000 m Calibration Run Calibration Data Analysis Calibration Database Quality Histograms LED Calibration Data Gain Monitors

  20. Data from a depth of 4000 m Calibration Run

  21. Data from a depth of 4000 m Single PMT Rates Trigger:≥4fold Coincidence

  22. Data from a depth of 4000 m Trigger Studies Preliminary Data Collected with 4fold Majority Trigger Thresholds at 30mV (1/4 P.E.) Experimental Points M.C. Estimation (Atmospheric muons + K40 ) Trigger Rate (Hz) Coincidence Level Total Charge inside the Trigger Window Coincidence Level

  23. Data from a depth of 4000 m Trigger Studies Preliminary Data Collected with 4fold Majority Trigger Thresholds at 120mV (1 P.E.) Experimental Points M.C. Estimation (Atmospheric muons + K40) Trigger Rate (Hz) Coincidence Level Total Charge inside the Trigger Window Coincidence Level

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