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Thermal link for cartridge-type cryostat
2003
Cryogenics (Guildford)
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We have developed a simple and small thermal link for cooling a cylindrical cartridge, on which device under test is mounted. It consists of a crown-like ring with an inner diameter of 170 mm or 140 mm and a clamping belt, which is a metal spring or nylon. A thermal conduction of the thermal link is achieved as the crownlike ring clamps the disk-like stage of the cartridge with external force of a clamping belt. This link can be applied at various temperature ranges from 2 K to 100 K. The
doi:10.1016/s0011-2275(03)00098-5
fatcat:2w4zlz47qnhproi7njy3rnsg3u
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... ed thermal conductance of the 170 mm link is 1.7, 5.6 and 3.3 W K −1 for 4, 12, and 80 K stages, respectively. These values are consistent with a empirical calculation within 10 % errors. This link is also effective to reduce mechanical vibration to be 6 µm (peak-to-peak) in the horizontal direction of the cartridge. This link is easily fabricated and is useful to various detectors which require to be cooled down.
Plug-In Cryogenic System for Cartridge-Type SIS Receivers
2003
Nippon Tenmon Gakkai obun kenkyu hokoku
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We developed a cryogenic system, which houses 3 cartridge-type superconductorinsulator-superconductor receivers for millimeter and submillimeter wavelengths. Since it was designed as a prototype receiver of the Atacama Large Millimeter/ submillimeter Array (ALMA), high stability, accurate alignment, and easy handling were required. To meet these requirements, the cryogenic system included the following technologies: 1) a thermal link without screws for receiver cartridges; 2) a central support
doi:10.1093/pasj/55.2.519
fatcat:ugcweubiwfgqdmfmql7dgyes5m
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... tructure to reduce vacuum and gravitational deformation; 3) bellows structures to reduce mechanical vibration of the cryocooler; and 4) a 3-stage Gifford McMahon (GM) cryocooler with an He pot (temperature stabilizer) to reduce the thermal ripple. The cryostat and receiver cartridges are composed of three stages. The temperatures on the 4 K, 12 K, and 100 K stages of the cartridge are 3.5 K, 13.4 K, and 78.3 K, respectively. The thermal conductances of the thermal links showed high performances of 1.7 W K −1 at the 4 K stage, 5.6 W K −1 at the 12 K stage, and 3.3 W K −1 at the S. Yokogawa et al. Cryogenic System for SIS Receiver [Vol. , 100 K stage. The mechanical vibration on the 4 K stage of the cartridge was reduced to one-tenth, as small as ≈ 2 µm peak-to-peak, compared to that on the 4 K coldhead of the cryocooler, ≈ 20 µm peak-to-peak. The temperature ripple on the cartridge was reduced to as small as 2 mK peak-to-peak, which corresponds to one-seventh of the ripple on the 4 K coldhead with an He pot. ∆T is an expected temperature loss originating in the thermal link.
Author Index
2021
2020 International Symposium on Antennas and Propagation (ISAP)
unpublished
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A copy of this work was available on the public web and has been preserved in the Wayback Machine. The capture dates from 2021; you can also visit the original URL.
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, Hanako 3E2.2
427 Observations on Near-Field Evaluation of 5G Signal
Quality
Noda, Kazufusa 4B3.4
775
The Analysis of the Octave-Band Self-Complementary
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415 ...
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Circularly Polarized Array Antenna
Nishiyama,
Takeshi
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703
Miniaturized Shinkansen Antenna for Overhead-Line
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doi:10.23919/isap47053.2021.9391428
fatcat:z3obv4cmlrctdo3q5vrbidinqu