SLAC microresonator RF (SMuRF) electronics: A tone-tracking readout system for superconducting microwave resonator...

Area of Science:

• Cryogenic detector systems
• Microwave-frequency electronics
• Particle physics and astronomy instrumentation

Background:

• Large-scale scientific experiments require highly multiplexed readout systems for numerous cryogenic sensors.
• Microwave-frequency resonators are crucial for multiplexing thousands of detector channels onto a single readout line.
• Existing room-temperature electronics face challenges in supporting these advanced cryogenic detector arrays.

Purpose of the Study:

• To introduce the newest generation of SLAC Microresonator RF (SMuRF) electronics.
• To detail the hardware, firmware, and software of this warm digital control and readout system.
• To compare the system's performance against science-driven design requirements.

Main Methods:

• Development of a warm digital control and readout system for microwave-frequency resonator-based cryogenic detectors.
• Implementation of a closed-loop tone-tracking algorithm to minimize RF power to cold amplifiers.
• System reconfiguration for both low-bandwidth, large-channel-count and high-bandwidth applications.

Main Results:

• The SMuRF system can read out up to 3328 channels across a 4-8 GHz bandwidth.
• The closed-loop tone-tracking algorithm significantly reduces RF power and intermodulation product noise.
• The system demonstrates successful deployment in diverse lab and field settings worldwide.

Conclusions:

• The SMuRF electronics represent a significant advancement in cryogenic detector readout systems.
• The system's design and performance meet the demands of ultra-sensitive measurements in particle physics and astronomy.
• SMuRF is baselined for future large-scale observatories, highlighting its reliability and scalability.