KM2A PMT testing platform FENG Cunfeng, LI Chaoju, SUN Yansheng Shandong University THE 2 nd WORKSHOP OF AIR SHOWER DETECTION AT HIGH ALTITUDES IHEP, Beijing,

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Presentation transcript:

KM2A PMT testing platform FENG Cunfeng, LI Chaoju, SUN Yansheng Shandong University THE 2 nd WORKSHOP OF AIR SHOWER DETECTION AT HIGH ALTITUDES IHEP, Beijing, 17~19, Feb. 2011

Outline 2011/2/182 The 2nd workshop of air shower detection at high altitudes  LHAASO KM2A PMT  PMT testing scheme and instrument  Primary testing results  Summary

LHAASO KM2A PMT KM2A detector unit: – Each detector unit consist of 16 plastic tiles and one PMT. – PMT couple to plastic tiles by around 100 optical fibers. – Dynamical range: 1~3000 charge particles – Total 5,000 units, means 5,000 PMTs Characteristics of PMT for KM2A anode linearity range: ~100mA within 5% spatial uniformity: <10% in the center region of the window TTS(transit time spread): ~1ns Low noise Gain: /2/18 The 2nd workshop of air shower detection at high altitudes 3

4 Schematic diagram of the testing system PC WinXP+Labview VME HV SY1527 dark box QDCLTDscale Pulse generator Diffusion filter LED1 ps pulse laser amp Aging box1 Aging box2 Aging box3 LED Digital motor fan in/out 15 PMTs LED2 Oscilloscope The whole system is controlled by the central compute

Instrument VME DAQ system HV power supply SY channel output Scanning & testing dark box scan 16 PMTs simultaneously Pulse generator 8 output channels Oscilloscope band width: 500MHz Picosecond pulse laser, LED driver 2011/2/18 The 2nd workshop of air shower detection at high altitudes 5

Control panel Developed with LabView Main panel Function panel DAQ(VME control) Pulse generator HV power supply Scan motor Oscilloscope 2011/2/18 The 2nd workshop of air shower detection at high altitudes 6

Linearity measurement  Two LEDs used: LED1, LED2 – LED driver amplitude: 0~20V – LED driver width: 20ns – LED driver triggered by pulse generator  LED1 and 2 light alternately and together  linearity=[I led1+led2 -(I led1 +I led2 )]/I led1+led2 *100% 2011/2/18 The 2nd workshop of air shower detection at high altitudes 7

Uniformity measurement Optical fiber scan the PMT window in 2D. – Step pace:1mm – Control by digital motor Central computer communicate with digital motor, LED driver and DAQ system 2011/2/18 The 2nd workshop of air shower detection at high altitudes 8

Rise time, TTS Light source : picosecond pulsed light (laser diode) trigger by the generator Width: ~100ps Oscilloscope used to measure the rise time, TTS The measurement results are read to central PC with ethernet. One channel input the trigger. 3 channels for PMTs signal. rise time read from oscilloscope directly TTS(transit time spread): Read the PMT signal and laser trigger signal wave shape Transit time=T signal- T trigger -T delay 2011/2/18 The 2nd workshop of air shower detection at high altitudes 9

Gain & Single photoelectron peak Gain – XP2622 – HV: V Single photoelectron peak – XP2622 – HV: 1800V 2011/2/18 The 2nd workshop of air shower detection at high altitudes 10

Summary The PMT testing platform almost ready The platform is easy to use – One push, all results will automatic present Except the oscilloscope, need switch manually. The platform is speedy – One batch 15 PMTs, testing simultaneously – One or two batch per day. – One year or half year will finish all 5,000 tubes. 2011/2/18 The 2nd workshop of air shower detection at high altitudes 11

2011/2/18 The 2nd workshop of air shower detection at high altitudes 12 Thanks for your attention!