BeEST collaboration meeting 2025

Session

BeEST setups at collaborating facilities

May 14, 2025, 11:15 a.m.

Auditorium (TRIUMF)

128. Current and future plans for LLNL

Stephan Friedrich (Lawrence Livermore National Laboratory)

2025-05-14, 11:15 a.m.

Oral invited talk

At LLNL, we can currently operate up to 32 STJs in two “wet” adiabatic demagnetization refrigerators (ADRs) with liquid N2 and He pre-cooling and a base temperature of ~0.1 K. One of them holds the STJs at the end of a cold finger so that it can be surrounded by large scintillators for coincidence measurements. We also own a “dry” ADR with pulse-tube pre-cooling and a wet dilution refrigerator...

126. BeEST@PNNL: Current Status and Plans

Francisco Ponce (Pacific Northwest National Laboratory)

2025-05-14, 11:35 a.m.

Oral invited talk

Phase IV of the BeEST experiment requires continuous stable operation of the STJ sensor arrays for 100+ days. This requires transitioning into a dilution refrigerator which will bring new systematics and additional opportunities to deploy recent capabilities demonstrated at LLNL. In this presentation, we will cover the status of STJ sensor operations at PNNL and outline potential areas of improvement.

137. Enhancing Thermal Stability in Dilution Refrigeration at TRIUMF

Ashley Marie Evangelista (TRIUMF)

2025-05-14, 11:55 a.m.

Oral invited talk

This contribution will discuss the operation of the VeriCold Dilution Refrigerator (DR) at TRIUMF, a crucial cryogenic instrument for experiments that need ultra-low temperatures and long-term operational duration. A significant challenge was achieving and maintaining stable millikelvin temperatures, essential for effectively operating our Superconducting Tunnel Junction (STJ) detectors for...

101. STJs in Colorado - Fridges at CURIE and Mines

Wouter Van De Pontseele (Colorado School of Mines)

2025-05-14, 12:15 p.m.

Oral invited talk

Together with Maybell Quantum, we are designing a low-vibration dilution refrigerator with a large and modular sample area. This fridge will be installed on the Mines campus and is a first step towards the Colorado Underground Research Institute (CURIE). At CURIE, the muon flux is 500x suppressed, and we will have low $-$ and in-situ characterized $-$ vibration, EMI disturbances, and high...

125. An Experimental Design for Testing STJs in Dilution Refrigerators for BeEST

Joseph Templet (Colorado School of Mines)

2025-05-14, 12:35 p.m.

Oral contributed talk

Dilution refrigerators, in contrast to the single-shot adiabatic demagnetization refrigerators previously utilized in the BeEST experiment, provide continuous cooling power, resulting in a nearly indefinite experimental runtime and a colder, more thermally stable base temperature—properties beneficial for STJ operation. Here, I discuss a bespoke experimental design for testing STJs in dilution...