Speaker
Description
Superconducting transition-edge sensor (TES), operating in the mK temperature range, exhibit extremely low noise levels and excellent energy resolution. TES is widely used in the detection of cosmic microwave background radiation (CMB) and in synchrotron radiation, free-electron laser spectrometers. As the number of detector increases, the heat loading to the mK stage of refrigerator from the conducting of the read out cable from the mK stage to room-temperature will increase significantly. As the cooling capacity of refrigerator at mK is limited, this will limit the scale of the TES array. To increase the number of the TES detector, the mutiplexing cryogenic readout electronics is involed to readuce the number of the read out cable. The most mature technology is the time-division multiplexing (TDM) superconducting quantum interference device (SQUID). This paper focuses on the development of warm readout electronics for TDM. The two-stage SQUID readout architecture of TDM achieves multiplexed readout of multiple detectors by cyclically selecting each row’s first-stage SQUID, controlled by SQUID superconducting switching. This greatly reduces power consumption at each stage. We use a analog-to-digital converter (ADC) with a sampling rate of up to 125MSPS and 16-bit resolution to receive data. The data is then processed in real-time using a digital proportional-integral-derivative (PID) feedback algorithm in FPGA. We also use a 16-bit, 2.8GSPS digital-to-analog converter (DAC) to send synchronous SQUID magnetic flux locking signals. The goal of this work is to achieve a single-channel 20:1 multiplexing factor and to perform high-speed real-time data processing based on FPGA, GPU.
| Minioral | Yes |
|---|---|
| IEEE Member | No |
| Are you a student? | Yes |
