This is money and time-saving question regarding the optimum method of hooking PMT to power supply.
The commonly used technique is using high voltage (1000-1500 volt) and resistive dividers along the 9 to 11 dynodes. Between each consecutive dynodes a resistor of 20 kΩ to 10 MΩ distribute the HV equally among the dynodes. Here alone, I have to build two socket assemblies to test the advantages and disadvantages of each resistive mode (the low 20 KΩ and the high 10 KΩ).
The HV method is expensive and bulky. Any regulated HV power supply costs over $200, used, and constitutes a technical challenge in insulation.
The seemingly best choice, I ponder, would be a regulated 100 VDC power supply applying potential in parallel to the 9 to 10 dynodes. I have not seen anyone doing that except an article from 1967 using three 300 VDC sources to power 10-pin PMT, each source supply 3 dynodes. Here also, the regulated DC power supply is not very cheap or small, though smaller and cheaper than the regulated HV one.
The main application in this question is photoscintillation detection, very sensitive to signal to noise ratio. Without high regulated power supply, the signal output from the PMT cannot be used reliably.
Any comment or recommendation should replete the web literature on such technical matter.
Mohamed F. El-Hewie
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