We are studying the rate dependent responses of photomultiplier tubes utilizing pulsing LEDs. We used a single fast blue LED from NICHIA. The pulse rate ranges from 1Hz to 10MHz with a fixed pulse width of 44ns.
LED Pulsing Circuit
Scope Trace from the LED pulser (GIF).
Photomultiplier Tube Responses for R-5900 6A23C1 and Base Number 63:
Propagation Delay versus Voltage within the R5900 PMT (JPG).
PMT Response Comparisons for Different Tubes:
Comparison of Two Different Third Generation and One Second Generation Tubes at 550V: (JPG).
Comparison of Equivalent Voltage Response for Different Styles of PMTs with 10,000x Attentuation: (JPG).
Responses at 600V across the base of the PMT:
Responses at 450V across the base of the PMT:
Amplifier for the FND-100 Photodiode
Rate Dependent Responses of FND-100 and FFD-200 Photodiodes (JPG).
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