Analysis of MA-PMTs for a Ring Imaging Cherenkov detector*

The mystery of sea quark distributions in the proton has led to the construction of a Ring Imaging CHerenkov (RICH) detector at the Thomas Jefferson National Accelerator Facility. RICH which will provide particle identification in the range of 3-8 GeV/c for the study of all the light sea and the strange sea contributions to proton spin.  RICH collects Cherenkov photons using an array of multi-anode photomultiplier tubes (PMTs). Because their response to the low light conditions of the RICH is non-uniform, gain equalization across all PMTs requires a more sophisticated modeling technique than has
previously been developed. We are working to produce such a model, with the ultimate goal of applying it to gain equalization over the entire RICH. We will take low-light data from select PMTs in a controlled laser setup, equalize the gains using model output, and further refine the model
to agree with laser data. I will be presenting the results of these tests in my poster.