Properties of selected structural and flat flexible cabling materials for low temperature applications

Daal, M.; Zobrist, Nicholas; Kellaris, Nicholas; Sadoulet, B.; Robertson, MM

doi:10.1016/j.cryogenics.2018.10.019

Cited by 7 publications

(3 citation statements)

References 52 publications

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“…Wm -1 K -1 for Kapton HN films, which is within the range (0.12-0.23 Wm -1 K -1 ) of previously reported values for Kapton [52], [59]. However, since we assumed the interfacial resistance between Kapton layers to be negligible, the measured thermal conductivity of Kapton, , is representative of a lower bound.…”

Section: Please Cite This Articlesupporting

confidence: 84%

Intrinsic thermal interfacial resistance measurement in bonded metal–polymer foils

Rajagopal

Man

Agrawal

et al. 2020

Review of Scientific Instruments

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Heat conduction through bonded metal-polymer interfaces often limits the overall heat transfer in electronics packaging, batteries, and heat recovery systems. To design the thermal circuit in such systems, it is essential to measure the thermal interfacial resistance (TIR) across ~1-100 μm junctions. Previously reported TIR of metal-polymer junctions utilize ASTM E1530-based twoblock systems that measure the TIR by applying pressure across the interface through external heating and cooling blocks. Here, we report a novel modification of the ASTM-E1530 technique that employs integrated heaters and sensors to provide an intrinsic TIR measurement of an adhesively bonded metal-polymer junction. We design the measurement technique using finite element simulations to either passively suppress or actively compensate the lateral heat diffusion through the polymer, which can minimize the systematic error to ≲5%. Through proof-of-concept experiments, we report the TIR of metal-polymer interfaces made from DuPont's Pyralux doubleside copper-clad laminates, commonly used in flexible printed circuit boards. Our TIR measurement errors are <10%. We highlight additional sources of errors due to non-idealities in the experiment and discuss possible ways to overcome them. Our measurement technique is also applicable to interfaces that are electrically insulating such as adhesively-joined metal-metal junctions and sputter-coated or welded metal-polymer junctions. Overall, the technique is capable of measuring TIR ≳10 -5 m 2 KW -1 in bonded metal-polymer foils, and can be tailored for in situ measurements in flexible electronics, circuit packaging, and other hybrid metal-polymer systems.

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Section: Please Cite This Articlesupporting

confidence: 84%

Intrinsic thermal interfacial resistance measurement in bonded metal–polymer foils

Rajagopal

Man

Agrawal

et al. 2020

Review of Scientific Instruments

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“…This resulted in a near constant PID power, with T 0 exhibiting temperature oscillations of ± 30 mK about the fixed set point T 0 . Measuring k avg can capture unexpected temperature dependencies to help determine the shape of κ(T ) [16]. In our case, fitting a power law model, κ(T ) = AT B , was appropriate for this coax.…”

Section: Measuring Thermal Conductivity Of Yellow Brass Coaxial Cablementioning

confidence: 99%

Optimal Leveraging of a Gifford-McMahon Cryocooler’s Regenerative Cooling Power for SNSPD Applications

Cooper,

Chase,

Namburi

et al. 2024

IOP Conf. Ser.: Mater. Sci. Eng.

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Superconducting nanowire single photon detectors (SNSPDs) offer unparalleled efficiency, minimal dark count rates, and picosecond jitter, making them ideal for single photon detector applications across the visible to mid-IR spectrum. A common cryogenic system used to reach these detectors’ optimal operating temperatures (>1 K) consists of Sumitomo’s compact RDK101 Gifford McMahon Cryocooler (GMC) running on an Zephyr air cooled compressor, coupled with a helium four (4He) adsorption stage. In this work, our aim is to provide measurements of the RDK101 GMC second stage regenerator tube cooling power at several locations along its length. We then characterise the performance of the adsorption cooler with heat loads applied to the regenerator tube. Our measurements demonstrate that heat loads of 1.2 W can be intercepted at the tube’s section near the GMC’s first cooling stage, with a negligible effect on the performance of the adsorption cooler. The thermal conductivity of yellow brass coaxial was characterised from 4 K to 40 K. Here we show that the heat load from 64 coaxial cable can be optimally intercepted with the defined regenerator cooling power. These results indicate that a 1024-pixel SNSPD array using a 32x32 row column multiplexing architecture could be successfully implemented in this cryogenic platform.

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“…The cable previously developed by our lab (Nikaflex, gold) is compared with the subject of this paper (FLAX, salmon), and two commercial options by KEYCOM (P/N: NbTiNbTi034, burgundy) and Cryocoax (P/N 5139-P1NN-611-100P, pink). Solid lines are computed using literature values for Nb47Ti [24], [25], PTFE [23], Nikaflex (Kapton polyimid film) [15], [26], and Pyralux [24]. PTFE values were used to estimate the PFA dielectric in the FLAX cable [22].…”

Section: B Cross Talkmentioning

confidence: 99%

Flexible Coaxial Ribbon Cable for High-Density Superconducting Microwave Device Arrays

Mazin

Walter

Daal

et al. 2021

IEEE Trans. Appl. Supercond.

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Superconducting electronics often require highdensity microwave interconnects capable of transporting signals between temperature stages with minimal loss, cross talk, and heat conduction. We report the design and fabrication of superconducting 53 wt% Nb-47 wt% Ti (Nb47Ti) FLexible coAXial ribbon cables (FLAX). The ten traces each consist of a I0.076 mm NbTi inner conductor insulated with PFA (I0.28 mm) and sheathed in a shared 0.025 mm thick Nb47Ti outer conductor. The cable is terminated with G3PO coaxial push-on connectors via stainless steel capillary tubing (I1.6 mm, 0.13 mm thick) soldered to a coplanar wave guide transition board. The 30 cm long cable has 1 dB of loss at 8 GHz with-60 dB nearest-neighbor forward cross talk. The loss is 0.5 dB more than commercially available superconducting coax likely due to impedance mismatches caused by manufacturing imperfections in the cable. The reported cross talk is 30 dB lower than previously developed laminated NbTi-on-Kapton microstrip cables. We estimate the heat load from 1 K to 90 mK to be 20 nW per trace, approximately half the computed load from the smallest commercially available superconducting coax from CryoCoax.

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Properties of selected structural and flat flexible cabling materials for low temperature applications

Cited by 7 publications

References 52 publications

Intrinsic thermal interfacial resistance measurement in bonded metal–polymer foils

Intrinsic thermal interfacial resistance measurement in bonded metal–polymer foils

Optimal Leveraging of a Gifford-McMahon Cryocooler’s Regenerative Cooling Power for SNSPD Applications

Flexible Coaxial Ribbon Cable for High-Density Superconducting Microwave Device Arrays

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