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--- teama2024 [2024/02/27 20:58] – [Some things about single MPPC] duythanh
+++ teama2024 [2025/02/04 00:28] (current) – nuicise
@@ Line 1: / Line 1: @@
-====== Team A - single MPPC (Drafting) ======
+====== Team A - single MPPC ======
+<color #ed1c24>Group members:</color>
+  * **Alex Sells**, UCL, UK
+  * **Le Thien Nga**, Fulbright Univ., HCM
+  * **Tran Quang Anh**, USTH, HN
+  * **Vo Diep Trung Tin**, HUS-VNU, HCM
+  * **Vu Quang Minh**, USTH, HN
+<color #ed1c24>Mentors:</color> Dr. Thanh Dong, M.Sc. Thanh Nguyen, M.Sc. Shouvik Mondal
 MPPC models:  S13081-050CS(X1), 4 pieces
   * Operation voltage ~ 54.8V
@@ Line 7: / Line 15: @@
   * MPPC characteristics (noise, noice coincidence, electric gain)
   * Speed of light in the optical fibers/ Concept of TOF. We need to use very fast optical pulsing for this measurement to get more precise measurement. Will try to use LED-driven Beacon to get a pulse in ~ 2-4ns width
-  * Cosmic ray muons: rate, and light yield
+  * Cosmic ray muons: rate, and light yield, and at different zenith angle?
 ===== Allocated hardwares =====
+{{ :hw2024_teama.jpg?direct&800 |}}
   * Oscilloscope for signal recording and digitalized
     * It is connected via Ethernet and allowed to remote control from a PC
@@ Line 17: / Line 26: @@
   * Circuit board to be soldered by students, to provide voltage and get the signals
   * For LED Beacon, need other DC PS and Analog Discovery as function/waveform generator for trigger
-  * Plastic scintillator and wavelength shifting fiber
+  * Plastic scintillator (2.5cm (width) x 25cm (length) x1.27cm (thickness)) and wavelength shifting fiber (0.9cm diameter)
-  * Optical beam splitter and optical connectors
+  * Optical fiber beam splitter Thorlabs TT200R5F1A
 ===== Some things about MPPC =====
 ==== Some advantages ====
   * Low operation voltage (~53V - 70V)
-  * High multiplication ratio (gain) (1e -> ~10<sup>6</sup>e)
+  * High multiplication ratio (gain) (~10<sup>6</sup>)
   * High photon detection efficiency (up to ~50% at peak sensitivity wavelength)
-  * Fast response (a few nanosecond) and good time resolution
+  * Fast response (a few nanoseconds) and good time resolution
   * Wide spectral response range (wavelength ~270nm - 900nm)
   * Not affected by magnetic fields
-  * Highly resistant to mechanical shocks, and does not suffer from “burn-in” by incident light saturation
+  * Highly resistant to mechanical shocks, and does not suffer by incident light saturation
-==== Some operation ====
+==== Some operation features ====
   * The structures of all the pixels in an MPPC are the same and every pixel consists of an avalanche photodiode and a quenching resistor
-  * When one photon comes to a pixel in the MPPC, it will produce a pulse
+  * When one photon comes to a pixel in the MPPC, it will produce one pulse
+  * If more than one photon are detected by different pixels at the same time, the MPPC output will be a pulse which is a superimposed of the output pulses of those pixels
+  * The output of a pixel is always one pulse and it does not depend on the number of photons coming to the pixel at the same time
 ==== Reference ====
   * MPPC technical note [[https://www.hamamatsu.com/content/dam/hamamatsu-photonics/sites/documents/99_SALES_LIBRARY/ssd/mppc_kapd9008e.pdf]]
   * LED nano beacon [[https://www.sciencedirect.com/science/article/pii/S0168900222005174]]