[Jef] IEEE abstract draft

[Alexander Somov]

Hi,

Here is a draft of an abstract for the IEEE NSS/MIC  conference in October.
Please take a look and let me know if you have any comments/suggestions

Title:  A new active base of photomultiplier R4125 designed for the lead tungstate calorimeter

This paper presents the design, performance, and results of radiation tests of an active base for a
Hamamatsu 4125 photomultiplier tube. The active base was designed at Jefferson Lab and
comprises a high voltage divider and an on-board amplifier. The photomultiplier with the active
base is used to detect light from lead tungstate scintillating crystals of the forward
electromagnetic calorimeter of the GlueX detector. The addition of the amplifier within the active
base allows to operate the tube at lower high voltage, thereby limiting the photomultiplier anode
current to a few microamperes even at a maximum counter rate of 1 MHz, while retaining the
dynamic range of output signals. The performance of the active base and the calorimeter module
assembly was studied using a bench test setup and a prototype positioned into a beam of photons.
Measured key performance parameters such as linearity, high-rate capability, and the energy
resolution verified that the active base design aligns with the detector specifications. Additionally,
the resistance of the active base components to radiation was tested using a Caesium-137 source.
Some damage observed during these tests required to make modifications to the original base
design to improve its resilience.

Thanks,
                Sasha

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