Evaluation of SRD1000 Superconductive Reference Devices

Schöttl, Stephan; Rusby, R. L.; Godfrin, H.; Meschke, Matthias; Goudon, V.; Triqueneaux, S.; Peruzzi, Andrea; Groot, M. J. de; Jochemsen, R.; Bosch, W.A.; Hermier, Y.; Pitre, Laurent; Fellmuth, B.; Engert, J.

doi:10.1007/s10909-005-2329-5

Cited by 12 publications

(3 citation statements)

References 2 publications

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“…In addition, there exist many other methods of practical thermometry in the temperature range below 1 K (e.g. second sound in a 3 He- 4 He mixture [21], superconducting transition fixed points of alloys and pure metals [32]). In the present work, a direct comparison of ITS-90 and PLTS-2000 from 0.65 K to 1 K has been performed for the first time.…”

Section: Discussionmentioning

confidence: 99%

Direct comparison of ITS-90 and PLTS-2000 from 0.65 K to 1 K at LNE-CNAM

et al. 2021

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In the temperature range between 0.65 K and 1 K, the international temperature scale of 1990 (ITS-90) is based on 3He vapour–pressure thermometers and overlaps with the provisional low temperature scale of 2000 (PLTS-2000) defined by the melting pressure of 3He. An indirect comparison at PTB revealed differences between the two scales of up to 1.5 mK at 0.65 K (Engert et al 2007 Metrologia 44 40–52). Stimulated by the PTB results, we have performed a direct comparison T 90–T 2000 from 0.65 K to 1 K at LNE-CNAM. To test repeatability, the experiment was conducted twice: in 2019 and 2020. We find differences T 90–T 2000 of 0.28 mK at 1 K, increasing to 1.58 mK at 0.65 K. The direct comparison, eliminates the uncertainty component due to the transfer resistance thermometer and its calibration. Except for a point near 1 K, the new results are in accordance with those obtained at PTB (differences of less than 0.22 mK), which makes it possible to improve the accuracy of the equation specified in ITS-90.

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Section: Discussionmentioning

confidence: 99%

Direct comparison of ITS-90 and PLTS-2000 from 0.65 K to 1 K at LNE-CNAM

et al. 2021

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“…The thermometers on the low temperature sample were calibrated by means of an SRD 1000 (Superconductive Reference Device) and a NBS SRM 767a fixed point device [4][5][6]. The thermometers on the high temperature sample were calibrated using a commercial secondary calibrated thermometer, with an expected accuracy of 1%.…”

Section: Experimental Technique and Measurementsmentioning

confidence: 99%

Thermal conductivity of Tecamax® SRP from millikelvin temperatures to room temperature

2010

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Tecamax® SRP (self-reinforced polyphenylene) is a new commercially available amorphous polymer which is suitable for use at cryogenic temperatures. It has a high tensile strength (210 MPa at room temperature), resulting from the molecular structure of the polymer rather than by the addition of reinforcing materials. We have measured the thermal conductivity between 60 mK and 280 K. We find that the conductivity below 10 K is similar to, but lower than, most amorphous materials, and the material offers a good combination of low conductivity at low temperatures and high tensile strength. Our results suggest that the material may in fact have a small crystalline component, which may be a partial explanation for the low conductivity. Above 10 K, the temperature dependence of the conductivity is different from most amorphous materials. We are unaware of previous measurements of the thermal conductivity of this material, even at room temperature.

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“…The device includes 10 stable reference points that are provided by the superconductive transitions of samples of several materials in the range from 10 mK to 1 K. The output voltage of the electronics versus sensor temperature shows distinct transitions at the reference temperatures T C (see Figure 6). An evaluation of several sets of devices and electronics by various metrological institutes in Europe proved that the concept was reliable for transferring the PLTS-2000 scale [9]. In the period from 2003 to 2006, several systems were built by HDL and calibrated at PTB (Physikalisch-Technische Bundesanstalt, Berlin).…”

Section: Cryogenic Fixed Points For the Its-90 Range From 138 K To 2mentioning

confidence: 99%

Traceable low and ultra-low temperatures in The Netherlands

Peruzzi

Bosch²

2009

J. Phys.: Conf. Ser.

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Abstract. The basis for worldwide uniformity of low and ultra-low temperature measurements is provided by two international temperature scales, the International Temperature Scale of 1990 (ITS-90) for temperatures above 0.65 K and the Provisional Low Temperature Scale of 2000 (PLTS-2000) for temperatures in the range 0.9 mK to 1 K. Over the past 10 years, the thermometry research in the Netherlands provided substantial contributions to the definition, realization and dissemination of these scales. We first give an overview of the Dutch contributions to the ITS-90 realization: a) 3 He and 4 He vapour pressure thermometer range of the ITS-90, 0.65 K to 4 K (1997), b) 4 He interpolating constant volume gas thermometry for the ITS-90 range 3 K to 24.5 K (2007) and c) cryogenic fixed points for the ITS-90 range 13.8 K to 273.16 K (2005). Then we highlight our work on 3 He melting pressure thermometry from 10 mK to 1 K (2003) to support the dissemination of the PLTS-2000. Finally we present the current status of the Dutch calibration facilities and dissemination devices providing for traceable low and ultra-low temperatures for use in science and industry: a) the NMi-VSL cryogenic calibration facility for the range 0.65 K to 273.16 K and b) the SRD1000 superconductive reference devices for the range 10 mK to 1 K.

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Evaluation of SRD1000 Superconductive Reference Devices

Cited by 12 publications

References 2 publications

Direct comparison of ITS-90 and PLTS-2000 from 0.65 K to 1 K at LNE-CNAM

Direct comparison of ITS-90 and PLTS-2000 from 0.65 K to 1 K at LNE-CNAM

Thermal conductivity of Tecamax® SRP from millikelvin temperatures to room temperature

Traceable low and ultra-low temperatures in The Netherlands

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