Axion Dark Matter eXperiment: Detailed Design and Operations

TL;DR

The ADMX experiment has achieved unprecedented sensitivity in searching for axion dark matter within a specific mass range by utilizing advanced quantum amplifiers and cryogenic technology, successfully completing two science runs.

Contribution

This paper details technological advancements and experimental methods that enhanced the sensitivity of axion detection, including the use of quantum-limited amplifiers and novel noise characterization tools.

Findings

Successful completion of two axion search runs in the 2.66-3.1 μeV range

Implementation of state-of-the-art quantum amplifiers like JPA and MSA

Achievement of DFSZ sensitivity in axion detection

Abstract

Axion Dark Matter eXperiment (ADMX) ultra low noise haloscope technology has enabled the successful completion of two science runs (1A and 1B) that looked for dark matter axions in the $2.66$ to $3.1$ $\mu$eV mass range with Dine-Fischler-Srednicki-Zhitnisky (DFSZ) sensitivity Ref. [1,2]. Therefore, it is the most sensitive axion search experiment to date in this mass range. We discuss the technological advances made in the last several years to achieve this sensitivity, which includes the implementation of components, such as state-of-the-art quantum limited amplifiers and a dilution refrigerator. Furthermore, we demonstrate the use of a frequency tunable Microstrip Superconducting Quantum Interference Device (SQUID) Amplifier (MSA), in Run 1A, and a Josephson Parametric Amplifier (JPA), in Run 1B, along with novel analysis tools that characterize the system noise temperature.