New High-Speed Readout System Developed for Next-Generation Neutrinoless Double Beta Decay Detectors
Researchers from Berkeley Lab, McGill University, and collaborating institutions have demonstrated a new frequency-domain multiplexed readout system for transition-edge sensors (TESs) that samples detectors at 156 kHz — roughly 1,000 times faster than its cosmology-oriented predecessor. The system is designed to meet the demanding bandwidth and noise requirements of next-generation cryogenic calorimeter experiments searching for neutrinoless double beta decay, a rare hypothetical nuclear process whose detection would have profound implications for particle physics. Scaling such readout technology to thousands of channels is considered a critical engineering challenge for these experiments.
A multi-institutional team has published results in the Journal of Instrumentation (JINST) describing a new high-bandwidth frequency-domain multiplexing (fMUX) readout system tailored for transition-edge sensor (TES)-based cryogenic calorimeters operating at approximately 10 millikelvin. The system achieves a detector sampling rate of 156 kHz and a stable feedback bandwidth of 3 kHz, representing a roughly three-orders-of-magnitude improvement in sampling speed over existing fMUX systems currently deployed in millimeter-wave cosmology telescopes. Each readout module incorporates 10 superconducting resonators operating in the 1–5 MHz range and a DC superconducting quantum interference device (DC-SQUID), interfaced with high-speed FPGA-based electronics for digital signal processing and low-latency feedback. TESs offer a time resolution of approximately 100 microseconds, significantly better than the ~1 millisecond response times of conventional neutron transmutation doped (NTD) thermistors, making them attractive for improved background discrimination in rare-event searches. Multiplexed readout is essential for scaling these detectors to the thousand-channel arrays envisioned for next-generation experiments, as it minimizes thermal load and radioactive contamination from cabling. The work builds on fMUX technology previously developed at Berkeley Lab and McGill University and represents a concrete step toward instrumenting large-scale neutrinoless double beta decay detectors with TES technology. Neutrinoless double beta decay, if observed, would demonstrate that neutrinos are their own antiparticles and help explain the matter-antimatter asymmetry of the universe.
What's missing
The paper does not report achieved energy resolution figures for the full multiplexed TES system under realistic experimental conditions, and the scalability demonstration remains at the 10-channel module level with performance at the full thousand-channel scale not yet shown.
What different sources said
- arXiv physicsCenter
High-bandwidth frequency domain multiplexed readout of transition-edge sensors for neutrinoless double beta decay searches
Related
Gut Bacteria Enzyme Found to Break Down Heat-Processed Food Compounds, Producing Novel Biogenic Amines
Researchers have discovered that an enzyme in common gut bacteria can degrade N-epsilon-carboxymethyllysine (CML), a compound formed during thermal food processing, producing previously unknown biogenic amines. The enzyme, ornithine decarboxylase SpeC from enterobacteria, acts on CML and related modified lysine derivatives through a low-level 'underground' catalytic activity. This finding suggests a previously unrecognized communication axis between thermally processed dietary compounds and gut microbial physiology, with potential implications for host health.
Full-Length Gene Sequencing Reveals Two Distinct Bacterial Communities in Black-Legged Ticks Expanding Into Canada
Researchers used Oxford Nanopore full-length 16S rRNA gene sequencing to characterize the microbiome of Ixodes scapularis black-legged ticks collected in Nova Scotia, Canada, distinguishing between tick-adapted bacteria and environmentally acquired bacteria. The study comes as I. scapularis — the primary vector of Lyme disease — is rapidly expanding northward into Canada due to climate change. The findings suggest that environmentally derived bacteria in tick microbiomes are not mere contamination, which has implications for how tick microbiome data is collected and interpreted across surveillance studies.
Study Identifies Metabolic Link Between Cell Envelope Stress and Biofilm Formation in Bacteria
Researchers have discovered that the metabolite acetyl-CoA directly inhibits enzymes that degrade the bacterial signaling molecule c-di-GMP, connecting cell envelope biosynthesis stress to biofilm formation in Pseudomonas aeruginosa. The study found that sub-inhibitory concentrations of antibiotics targeting early peptidoglycan biosynthesis — but not other antibiotic classes — elevate c-di-GMP levels by reducing phosphodiesterase activity, with acetyl-CoA competing for the enzyme active site. Because the relevant enzyme domain is broadly conserved across bacterial species, this checkpoint mechanism may be widespread and could have implications for understanding antibiotic-induced biofilm responses.