Presentation on theme: "P.P. & APD gain ratio report— 4 month testing Ken Chiang, J.Y. Lin, Jeri Chang 2009/3/19."— Presentation transcript:
P.P. & APD gain ratio report— 4 month testing Ken Chiang, J.Y. Lin, Jeri Chang 2009/3/19
Super Belle Meeting2 Two kinds of Samples P.P. x3 APD x2 (photo pentode tubes) (avalanche photodiodes)
Super Belle Meeting3 Schematic Diagrams for APD 400V We use 400V for Serial No. AA V & 450V for Serial No. AA0724 Light Source: Blue LED Light Intensity: detected by PIN Photodiode simulate very weak light (very simple scale)
Super Belle Meeting4 Schematic Diagrams for P.P. Pentode mode Diode mode
Super Belle Meeting5 Status of Gain factor of APD Gain Ratio is temperature sensitive March Nov.Dec.Feb.Mar. Temp.( ℃ ) 23.2~2618.5~ ~ ~23.4
Super Belle Meeting6 Check temp. vs. Gain ratio of APD 2009 Feb. results
Super Belle Meeting7 Status of Gain factor of PP Nov.Dec.Feb.Mar. Temp.( ℃ ) 23.0~ ~ ~ ~23.3 Gain Ratio is NOT temperature sensitive.
Super Belle Meeting8 Output Voltage of APD (HV applied)
Super Belle Meeting9 Output Voltage of APD (LV applied)
Super Belle Meeting10 Output Voltage of PP (pentode mode)
Super Belle Meeting11 Output Voltage of PP (diode mode)
Super Belle Meeting12 Next Steps We will get some more APDs from KEK. (4 pcs of APD made by Hamamatsu.) One of the APD will be attached on the pure CsI crystal One pure CsI crystal, ~4cm tall, was shipped to Taiwan last week. (2 master students will work on it).
Super Belle Meeting13 Simulation for the readout circuit (TINA software) ~10,000 photons are expected to be seen. We use a almost same PCB to measure the high energy cosmic ray before. Current from APD Function Generator
Super Belle Meeting14 making a 1.5T magnetic field 2 undergraduate students are making a 1.5T magnetic field now. Because the temperature is too high while we applied current. We are thinking about the other way.
Super Belle Meeting15 Summary The gain ratio of PP and APD samples are under testing for 4 months. The readout setup for pure CsI crystal+APD is in progress. We are making a magnetic field in order to understand the effect on PP and APD.
Super Belle Meeting16 Backup Slides Setup pictures Monitoring pictures
Super Belle Meeting17 Setup: Outside View APD P.P. Box Size Setup
Super Belle Meeting18 Inside the Box: P.P. 20cm PIN PD The distance between LED and PP samples is 34cm. The wave length of blue LED is about 450 nm.
Super Belle Meeting19 Inside the Box: APD 20cm PIN PD The distance between LED and APD samples is 34cm. The wave length of blue LED is about 450 nm.
Super Belle Meeting20 Output Monitoring Voltage Temperature