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Antonova, M., Capo, J., Cervera, A., Fernandez, P., Garcia-Peris, M. A., & Pons, X. (2026). Millikelvin-precision temperature sensing for advanced cryogenic detectors. Nucl. Instrum. Methods Phys. Res. A, 1082, 171062–13pp.
Abstract: Precise temperature monitoring-to the level of a few millikelvin-is essential for the operation of large-scale cryostats requiring a recirculation system. In particular, the performance of Liquid Argon Time Projection Chambers-such as those planned for the DUNE experiment-strongly relies on proper argon purification and mixing, which can be characterized by a sufficiently dense grid of high-precision temperature probes. In this article, we describe the key components of a novel temperature monitoring system developed for a prototype of the DUNE experiment. In particular, a new technique for the cross-calibration of Resistance Temperature Detectors in cryogenic liquids will be presented in detail. This calibration has enabled the validation and optimization of the system's components, achieving an unprecedented relative precision better than 3 mK.
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SuperNEMO Collaboration(Argyriades, J. et al), Carcel, S., Diaz, J., Monrabal, F., Serra, L., & Yahlali, N. (2010). Results of the BiPo-1 prototype for radiopurity measurements for the SuperNEMO double beta decay source foils. Nucl. Instrum. Methods Phys. Res. A, 622(1), 120–128.
Abstract: The development of BiPo detectors is dedicated to the measurement of extremely high radiopurity in (TI)-T-208 and Bi-214 for the SuperNEMO double beta decay source foils. A modular prototype, called BiPo-1, with 0.8 m(2) of sensitive surface area, has been running in the Modane Underground Laboratory since February, 2008. The goal of BiPo-1 is to measure the different components of the background and in particular the surface radiopurity of the plastic scintillators that make up the detector. The first phase of data collection has been dedicated to the measurement of the radiopurity in (TI)-T-208. After more than one year of background measurement, a surface activity of the scintillators of A((TI)-T-208) = 1.5 μBq/m(2) is reported here. Given this level of background, a larger BiPo detector having 12 m(2) of active surface area, is able to qualify the radiopurity of the SuperNEMO selenium double beta decay foils with the required sensitivity of A((TI)-T-208) <2 μBq/kg (90% CL.) with a six month measurement.
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