The specific heat and thermal conductivity of Eccosorb CR-124 between 800mK and 6K

Wikus, P.; McCarthy, Kevin; Hertel, Scott; Bagdasarova, Yelena; Figueroa‐Feliciano, E.; Leman, S. W.; Rutherford, John; Trowbridge, S. N.; Vasquez, Scott W.

doi:10.1016/j.cryogenics.2009.06.002

Cited by 5 publications

(5 citation statements)

References 12 publications

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“…In order to better understand the power handling and thermalization dynamics we compare these results with thermal measurements performed by Wikus et al at higher temperature on bulk Eccosorb CR-124 21 . By extrapolating their expression for the thermal conductivity of Eccosorb CR-124 to temperatures below 800 mK we obtain (see S.I.…”

Section: Thermalization At Low Temperaturementioning

confidence: 99%

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Absorptive filters for quantum circuits: Efficient fabrication and cryogenic power handling

Paquette¹,

Griesmar²,

Lavoie³

et al. 2022

Preprint

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We present an efficient fabrication method for absorptive microwave filters based on Eccosorb CR-124. Filters are fabricated from readily available parts and their cut-off frequency can be set by their length. They exhibit desirable properties such as a very large and deep stop band with rejection beyond 120 dB at least up to 40 GHz, more than 10 dB return loss in both the pass and the stop band as well as an error-function shaped step response without overshoot.Measurements at very low temperature show that the filters thermalize on a time scale of the order of 100 s and that they can absorb power as high as 100 nW with their noise temperature staying remarkably cool, below 100 mK.These properties make the filters ideal for cryogenic filtering and filtering of IF port signals of mixers.

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Section: Thermalization At Low Temperaturementioning

confidence: 99%

“…Where q(r) is the radial heat flow per unit length, ρ = 4600 kg/m 3 the density of Eccosorb and c(T ) = c e T + c p T 3 with c e = 0.132 J kg −1 K −2 and c p = 0.0053 J kg −1 K −4 its heat capacity from ref 21 .…”

Section: Thermal Dynamicsmentioning

confidence: 99%

Absorptive filters for quantum circuits: Efficient fabrication and cryogenic power handling

Paquette¹,

Griesmar²,

Lavoie³

et al. 2022

Preprint

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show abstract

“…The data in Ref. [19] is approximated by this form, although the linear term may be associated with the high metallic fraction in CR-124. Ref.…”

Section: Sleevementioning

confidence: 99%

“…Taking into account the specific heat contributions from the copper [16], H20E [17], and Stycast 2850FT [18] in the inner-assembly, and the mass of the absorber (3.26 g), we estimate the specific heat of MF-117 with the functional form C v (T ) = 0.12 T 2.06 mJ g −1 K −1 between 3.5 K and 15 K. The last two digits used in the naming convention of the MF stock are correlated with the metallic volume filling fraction of the mixture. Lacking a published value for the C v (T ) of MF-117, we compare the measured response to CR-110 [2] and CR-124 [19] as shown in Fig. 6 which bound the filling fraction of the formulation in use.…”

Section: Thermal Responsementioning

confidence: 99%

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A waveguide-coupled thermally isolated radiometric source

Rostem

Chuss

Lourie

et al. 2013

Review of Scientific Instruments

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The design and validation of a dual polarization source for waveguide-coupled millimeter and sub-millimeter wave cryogenic sensors is presented. The thermal source is a waveguide mounted absorbing conical dielectric taper. The absorber is thermally isolated with a kinematic suspension that allows the guide to be heat sunk to the lowest bath temperature of the cryogenic system. This approach enables the thermal emission from the metallic waveguide walls to be subdominant to that from the source. The use of low thermal conductivity Kevlar threads for the kinematic mount effectively decouples the absorber from the sensor cold stage. Hence, the absorber can be heated to significantly higher temperatures than the sensor with negligible conductive loading. The kinematic suspension provides high mechanical repeatability and reliability with thermal cycling. A 33-50 GHz blackbody source demonstrates an emissivity of 0.999 over the full waveguide band where the dominant deviation from unity arrises from the waveguide ohmic loss. The observed thermal time constant of the source is 40 s when the absorber temperature is 15 K. The specific heat of the lossy dielectric MF-117 is well approximated by Cv(T ) = 0.12 T 2.06 mJ g −1 K −1 between 3.5 K and 15 K.

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A cryogenic quasioptical millimeter and submillimeter wavelength bands blackbody calibrator

2010

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The specific heat and thermal conductivity of Eccosorb CR-124 between 800mK and 6K

Cited by 5 publications

References 12 publications

Absorptive filters for quantum circuits: Efficient fabrication and cryogenic power handling

Absorptive filters for quantum circuits: Efficient fabrication and cryogenic power handling

A waveguide-coupled thermally isolated radiometric source

A cryogenic quasioptical millimeter and submillimeter wavelength bands blackbody calibrator

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