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Hi,</div>
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Here is a draft of an abstract for the IEEE NSS/MIC conference in October.</div>
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Please take a look and let me know if you have any comments/suggestions</div>
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Title: A new active base of photomultiplier R4125 designed for the lead tungstate calorimeter</div>
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This paper presents the design, performance, and results of radiation tests of an active base for a</div>
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Hamamatsu 4125 photomultiplier tube. The active base was designed at Jefferson Lab and</div>
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comprises a high voltage divider and an on-board amplifier. The photomultiplier with the active</div>
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base is used to detect light from lead tungstate scintillating crystals of the forward</div>
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electromagnetic calorimeter of the GlueX detector. The addition of the amplifier within the active</div>
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base allows to operate the tube at lower high voltage, thereby limiting the photomultiplier anode</div>
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current to a few microamperes even at a maximum counter rate of 1 MHz, while retaining the</div>
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dynamic range of output signals. The performance of the active base and the calorimeter module</div>
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assembly was studied using a bench test setup and a prototype positioned into a beam of photons.</div>
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Measured key performance parameters such as linearity, high-rate capability, and the energy</div>
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resolution verified that the active base design aligns with the detector specifications. Additionally,</div>
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the resistance of the active base components to radiation was tested using a Caesium-137 source.</div>
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Some damage observed during these tests required to make modifications to the original base</div>
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design to improve its resilience.</div>
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Thanks,</div>
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Sasha</div>
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