Low noise amplifier R&D for CULTASK experiment at CAPP

Abstract

IBS/CAPP has launched CAPP-PACE, direct axion detection experiment aimed at a frequency range of 2.45 - 2.75 GHz. In the present detector setup, we utilize 1 K HEMT amplifiers which are the world-best commercial available silicon-based low temperature amplifier. However, in order to reach the QCD axion sensitivity and speed up the experiment, we are currently examining the possibility of replacing the first stage HEMT with a SQUID amplifier which could reduce the noise temperature drastically. A MSA (Microstrip SQUID Amplifier) is a good option for achieving a low noise level. This poster includes information of MSA, gain and noise measurement, and test results under magnetic fields. The finalized RF receiver chain of our experiment with a MSA will be also presented.