Cold Electronics Develpment for the Next Generation Axion Dark Matter eXperiment

The Axion Dark Matter eXperiment - Extended Frequency Range (ADMX-EFR) is a next generation microwave cavity haloscope experiment, which will search for axionic dark matter at DFSZ sensitivities in the 2 - 4 GHz frequency range. Optimizing noise performance in the first stage cold electronics is critical for achieving high scan speeds at our target sensitivities. At Washington University, we are developing this first stage cold amplifier system needed to amplify an axion signal above the background electrical noise. We will discuss our efforts in designing a system that can improve scan speeds through vacuum squeezing and the flux pumped Josephson parametric amplifiers (JPAs) capable of achieving this.