Temperature Dependence of Creep in F.C.C. and H.C.P. Metals at Low Temperature

Koval, V. A.; Osetski, A. I.; Soldatov, V. P.; Startsev, V. I.

doi:10.1007/978-1-4613-9853-0_25

Cited by 9 publications

(2 citation statements)

References 8 publications

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“…The creep rate can be directly related to frequency drift because spacer size changes directly the gap space between sapphire parts. Silver was selected for its low creep rate at cryogenic temperature which is nearly two orders of magnitude lower than copper at 40 K. [16,17]…”

Section: Geometry Center Supportmentioning

confidence: 99%

High stability 40 Kelvin cryo-cooled sapphire oscillator

Wang¹,

Dick²

IEEE International Frequency Control Sympposium and PDA Exhibition Jointly With the 17th European Frequency and Time Forum, 200

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We present initial test results for a new short-term frequency standard, the 40K Compensated Sapphire Oscillator (40K CSO). Included are measurements of resonator quality factor, operational frequency, turnover temperature, acceleration (g) sensitivity, frequency drift, and preliminary frequency stability tests. Long-term operation is facilitated use of a small cryo-cooler (1KW wall power) with no moving cryogenic parts, and thus no preset service interval for the cold head. Initial tests with this single-stage pulse-tube cooler show a stability of 3×10-14 (1 second ≤ τ ≤ 10 seconds) and a flicker floor of 2×10-14 .

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Section: Geometry Center Supportmentioning

confidence: 99%

High stability 40 Kelvin cryo-cooled sapphire oscillator

Wang¹,

Dick²

IEEE International Frequency Control Sympposium and PDA Exhibition Jointly With the 17th European Frequency and Time Forum, 200

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“…Silver was selected for its low creep rate at cryogenic temperature which is nearly two orders of magnitude lower thancopperat40K. [14,15] …”

Section: )mentioning

confidence: 99%

Cryo-cooled sapphire oscillator with mechanical compensation

Wang

Dick

Proceedings of the 2002 IEEE International Frequency Control Symposium and PDA Exhibition (Cat. No.02CH37234)

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We present test results for a short-term frequency standard, 40K Compensated Sapphire Oscillator (CSO). Included are measured resonator Q values, cryocooler vibration data, silver spacer construction process, and copper wall sensitivity. The 40K CSO design goals are a fiequency stability of lxlO-I4 (1 second I z I 100 seconds), a year or more continuous operation, and a compact rack-mount configuration. The 40K CSO[ 11 bridges the gap of two previous technology 10K CSO[2] and 77K CSO [3]. In particular, the 10K CSO incorporated a GiffordMcMahon type of cryocooler with no cryogens, while the 77K CSO developed thermo-mechanical compensation operating at 80 K. The 40K CSO can serve as an ndependent cscillator or as a "slaved local oscillator controlled by atomic standards like Hg ion trap, embling their inherent performance.

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Cryogenic Creep of Metals

Tien

Yen

1984

Advances in Cryogenic Engineering Materials

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Temperature Dependence of Creep in F.C.C. and H.C.P. Metals at Low Temperature

Cited by 9 publications

References 8 publications

High stability 40 Kelvin cryo-cooled sapphire oscillator

High stability 40 Kelvin cryo-cooled sapphire oscillator

Cryo-cooled sapphire oscillator with mechanical compensation

Cryogenic Creep of Metals

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