Speaker
Ji-Young Lee
(Institute for Basic Science)
Description
In an axion dark matter search haloscope experiment, the noise temperature of a linear amplifier is a crucial component that seriously affects the sensitivity of the dark matter axion search. In the CAPP18T experiment at CAPP/IBS in KAIST, we use a cryogenically cooled Josephson Parametric Amplifier (JPA) in order to amplify weak RF signals from a resonant cavity. In this presentation, we describe a method to obtain an accurate and repeatable input noise temperature of the JPA: We use a device with a cryogenic attenuator co-located with the amplifier. A dilution refrigerator (~20mK) and a cryogenic High Electron Mobility Transistor are used for this measurement. We will also discuss the calibration techniques.
Primary authors
Ji-Young Lee
(Institute for Basic Science)
Dr
Byeonghun Min
(IBS)
Dr
DongLak Kim
(IBS)
Dr
JinGeun Kim
(IBS)
Mr
HeeJun Park
(IBS)
Mr
Jongkuk Kim
(Korea Advanced Institute for Science and Technology)
Mr
YoungJae Lee
(KAIST)
Mr
Moohyun Ahn
(Seoul National University)
JONGHEE YOO
(KAIST)
