Application of Diodes to Measure Particle Beam Fluences Relevant to HL-LHC Requirements by Cooling and Current Reduction

The University of New Mexico ATLAS group has developed a device used for real-time monitoring of particle beam profile and fluence up to 10$^{15}$ n$_{eq}$/cm$^{2}$. The device is based on an array of OSRAM BPW34 PIN diodes, the forward voltage of which increases linearly with fluence over the range 2x10$^{12}$ to 1x10$^{15}$ n$_{eq}$/cm$^{2}$ at room temperature, before reaching saturation. The aim of my project is to explore the possibility of extending this linear range to a higher limit for consistency with silicon tracker upgrade requirements at the HL-LHC. We examine both cooling the diodes and decreasing the applied forward current used to measure forward voltage.