Session S15: The MOLLER Experiment

An overview and status of the MOLLER experiment at Jefferson Lab

The MOLLER experiment aims to achieve a precise measurement of the parity-violating asymmetry through electron-electron scattering in Hall A at Jefferson Lab, targeting an uncertainty level of 0.8 parts per billion (ppb). This measurement enables a 2.4 % determination of the weak charge of the electron at an average Q² of 0.0056 GeV², leading to an ultra-precise evaluation of the weak mixing angle--an important parameter in the Standard Model. The results of this measurement not only contribute to our understanding of fundamental physics but also offer an indirect avenue for exploring Physics Beyond the Standard Model, complementing high-energy collider searches. The experiment is currently in the construction and prototype testing phase, fully supported by funding. This presentation will provide an overview of the scientific objectives, outline the experimental apparatus, and report updates on the status of the MOLLER construction project.   

Radiation and Dose map for the MOLLER experiment

The MOLLER (Measurement Of a Lepton-Lepton Electroweak Reaction) experiment proposes to measure the parity-violating asymmetry in longitudinally polarized electron-electron (Møller) scattering. With the electrons being accelerated to 11 GeV, this measured asymmetry results in an ultra-precise low energy determination of the weak mixing angle, and constrains the searches of physics beyond the Standard Model. The radiation and radioactivity due to the electron beam interaction with material can cause severe damage to the electronics and considerable harm to the human body, if not appropriately shielded. A simulation of the dose estimation is necessary before the experiment starts, so that appropriate mitigation measures can be incorporated into the experimental design to minimize radiation exposure, to both people and equipment, during the running of the experiment. An excellent tool in radiation protection studies, FLUKA (FLUktuierende KAskade), is used for evaluating the residual radiation. In this talk, I will discuss the radiation and the dose map in the experiment enclosure from the simulation using FLUKA.