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P.P. & APD gain ratio report—4 month testing. Ken Chiang, J.Y. Lin, Jeri Chang 2009/3/19. Two kinds of Samples. (photo pentode tubes). (avalanche photodiodes). Schematic Diagrams for APD. We use 400V for Serial No. AA0705 & 450V for Serial No. AA0724. Light Source: Blue LED
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P.P. & APD gain ratio report—4 month testing Ken Chiang, J.Y. Lin, Jeri Chang 2009/3/19
Two kinds of Samples (photo pentode tubes) (avalanche photodiodes) Super Belle Meeting
Schematic Diagrams for APD We use 400V for Serial No. AA0705 & 450V for Serial No. AA0724 • Light Source: Blue LED • Light Intensity: detected by PIN Photodiodesimulate very weak light (very simple scale) Super Belle Meeting
Schematic Diagrams for P.P. Pentode mode Diode mode Super Belle Meeting
March 2008 2009 Status of Gain factor of APD Gain Ratio is temperature sensitive. Super Belle Meeting
Check temp. vs. Gain ratio of APD2009 Feb. results Super Belle Meeting
2009 2008 Status of Gain factor of PP Gain Ratio is NOT temperature sensitive. Super Belle Meeting
2008 2009 2008 2009 Output Voltage of APD (HV applied) Super Belle Meeting
2009 2008 2009 2008 Output Voltage of APD (LV applied) Super Belle Meeting
2008 2009 2009 2008 Output Voltage of PP (pentode mode) Super Belle Meeting
Output Voltage of PP (diode mode) 2008 2009 2009 2008 Super Belle Meeting
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 crystalOne pure CsI crystal, ~4cm tall, was shipped to Taiwan last week. (2 master students will work on it). Super Belle Meeting
Simulation for the readout circuit (TINA software) Current from APD ~10,000 photons are expected to be seen. We use a almost same PCB to measure the high energy cosmic ray before. Function Generator Super Belle Meeting
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 Meeting
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 Meeting
Backup Slides • Setup pictures • Monitoring pictures Super Belle Meeting
Setup APD P.P. Box Size Setup: Outside View Super Belle Meeting
Inside the Box: P.P. The distance between LED and PP samples is 34cm. The wave length of blue LED is about 450 nm. P.P. PIN PD 20cm Blue LED Super Belle Meeting
Inside the Box: APD The distance between LED and APD samples is 34cm. The wave length of blue LED is about 450 nm. APD PIN PD 20cm Blue LED Super Belle Meeting
Output Monitoring Voltage Temperature Super Belle Meeting