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Thermal link for cartridge-type cryostat

Masahiro Sugimoto, Yutaro Sekimoto, Sozo Yokogawa, Takeshi Okuda, Toshiaki Kamba, Hideo Ogawa, Kimihiro Kimura, Tetsuo Nishino, Kazufusa Noda, Katsuhiro Narasaki
2003 Cryogenics (Guildford)  
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
more » ... 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.
doi:10.1016/s0011-2275(03)00098-5 fatcat:2w4zlz47qnhproi7njy3rnsg3u

Plug-In Cryogenic System for Cartridge-Type SIS Receivers

Sozo Yokogawa, Yutaro Sekimoto, Masahiro Sugimoto, Takeshi Okuda, Tomohiko Sekiguchi, Toshiaki Kamba, Ken'ichi Tatematsu, Tetsuo Nishino, Hideo Ogawa, Kimihiro Kimura, Kazufusa Noda, Katsuhiro Narasaki
2003 Nippon Tenmon Gakkai obun kenkyu hokoku  
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
more » ... 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.
doi:10.1093/pasj/55.2.519 fatcat:ugcweubiwfgqdmfmql7dgyes5m

Author Index

2021 2020 International Symposium on Antennas and Propagation (ISAP)   unpublished
, 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 Antenna Noda, Kazuhiro 3C2.6 415  ...  of Monopulse Beam Steering Circularly Polarized Array Antenna Nishiyama, Takeshi 4B2.1 703 Miniaturized Shinkansen Antenna for Overhead-Line Voltage Detection and Wireless Communication Noda  ... 
doi:10.23919/isap47053.2021.9391428 fatcat:z3obv4cmlrctdo3q5vrbidinqu