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Abstract

In the design of gaseous detectors, a crucial but often overlooked phenomenon is the impact of magnetic fields on their operation. This influence can become particularly significant in high-energy environments like those expected in future fusion power plants, where strong magnetic fields are present within diagnostic ports. This is important in the case of a planned GEM-based radiated power diagnostic for future demonstration power plant - DEMO. To address this concern, a thorough analysis of the influence of the magnetic field on GEM detector modules was conducted. Two modes of interaction were identified. One related to the impact of magnetic field on the thermalized drifting electrons. Shifts due to E-cross-B drift and impact of field non-uniformity were quantified. Second mode of interaction involved ionizations from high energy X-rays. The deformation of the photoionization cloud due to magnetic field was parametrized based on energy and magnetic field intensity and angle. Additional analysis of the fraction of electrons retained in the ionization region was performed. The main conclusion was that the magnetic field impact on electron drift is predictable and mitigatable, while its effect on high energy photon detection is slightly beneficial.