Group members:

• Mohan Karthik, Tata Inst., IN
• Nguyen Gia Minh, Fulbright Univ., HCM
• Ta Van Minh, HUS-VNU, HN
• Hoang Pham Thanh Dat, HUS-VNU, HCM

Mentor: Dr. Son Cao

Metal-package PMT module: H6780-1 / backup H10721-110 (newly purchased, using for O-BLM and for other research)

• Voltage apply (tested) ~ 14V (range 11.5V to 15.5V)
• Gain driving (<1V)/ tested 0.9V
• Peak wavelength sensitivity is around 400nm

• PMT noise rate, raising, falling; PMT vs. siPM (quantum/detection efficiency, electric gain, linearity, dynamic range)
  • Try to make light tightening as much as possible and measure the noise rate (without LED) at different thresholds.
  • Use a pulsed optical LED with an optical fiber beam splitter to check the quantum/detection efficiency of PMT vs MPPC. For this you need to lowing down the light intensity as much as possible
  • For dynamic range: try to gradually increase the light intensity and check when the signal starts saturated. Be caution to not increase the light amount rapidly
• A concept of fast spectrometer: Get spectra of a white light source with optical filter and PMT
  • Use white light LED and pulsing it at different voltage/
  • Measurement (average acquisition) the signal amplitude with different optical filters (400nm, 455nm and 570nm)
    • Better to use fiber splitter with one signal is used to control the light source stability
• Cosmic ray muons measurement (rate, light yield) with plastic scintillator cubes
  • Estimate the rate of cosmic ray muon in the cube
  • From that estimate the threshold needed for the rate of coincidence
  • Check the spread of scintillation light induced by the mostly cosmic-ray muons

• PMT voltage supply <15V and for gain control <1V
• MPPC voltage supply <60V
  • Some RF noise is induced by this voltage supply. If you are using PMT only, do not turn o this supply.
• Light tightening is supper important for PMT (than for MPPC).
• Be gentle when dealing with optical fibers

• Oscilloscope Siglent SDS1104X-E
• Metal package PMT, model H6780-01
• A box with SiPM https://www.hamamatsu.com/content/dam/hamamatsu-photonics/sites/documents/99_SALES_LIBRARY/ssd/s13360_series_kapd1052e.pdf. Students can solder a new one
• DC power supplies for PMT and SiPM
• Analog Discovery 2
• Optical fiber beam splitter Thorlabs TT200R5F1A
• Scintillator cube
• White LED
• Optical filters Thorlabs FGL400, FGL455, FGL570

• Photomultiplier Tubes: Basics and Applications https://www.hamamatsu.com/content/dam/hamamatsu-photonics/sites/documents/99_SALES_LIBRARY/etd/PMT_handbook_v4E.pdf
• MPPC technical note https://hub.hamamatsu.com/content/dam/hamamatsu-photonics/sites/static/hc/resources/TN0014/mppc_kapd9005e.pdf
• PMT H6780-01 specification https://ifirse.icise.vn/nugroup/docs/hardware/manual/H6780-04.pdf