Study of low vibration 4 K pulse tube cryocoolers

Xu, Mingzhi; Nakano, Katsutoshi; Saito, Motokazu; Takayama, Hirokazu; Tsuchiya, Akihiro; Maruyama, Hiroki

doi:10.1063/1.4706920

Cited by 8 publications

(2 citation statements)

References 5 publications

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“…The center of each horizontal support was anchored to a 50 K radiation shield to reduce the heat load as much as possible. The cryostat design is based on the use of a double-stage PTCC (Sumitomo Heavy Industries type RP-082B) with cooling powers of 1 W/4 K at the 2 nd stage [6]. The major challenge is to design and construct the cryostat so that the total heat load, including AC loss during magnet excitation, the Joule heat from current leads, and by eddy current heating, are less than 1 W to the 4 K region.…”

Section: Cryostatmentioning

confidence: 99%

Cryogenic performance of a conduction-cooling splittable quadrupole magnet for ILC cryomodules

Kimura¹,

Andreev²,

Kashikhin³

et al. 2014

AIP Conference Proceedings

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Abstract.A conduction-cooled splittable superconducting quadrupole magnet was designed and fabricated at Fermilab for use in cryomodules of the International Linear Collider (ILC) type, in which the magnet was to be assembled around the beam tube to avoid contaminating the ultraclean superconducting radio frequency cavity volume. This quadrupole was first tested in a liquid helium bath environment at Fermilab, where its quench and magnetic properties were characterized. Because the device is to be cooled by conduction when installed in cryomodules, a separate test with a conduction-cooled configuration was planned at KEK and Fermilab. The magnet was converted to a conduction-cooled configuration by adding conduction-cooling passages made of high-purity aluminum. Efforts to convert and refabricate the magnet into a cryostat equipped with a double-stage pulse-tube-type cryocooler began in 2011, and a thermal performance test, including a magnet excitation test of up to 30 A, was conducted at KEK. In this test, the magnet with the conduction-cooled configuration was successfully cooled to 4 K within 190 h, with an acceptable heat load of less than 1 W at 4 K. It was also confirmed that the conduction-cooled splittable superconducting quadrupole magnet was practical for use in ILC-type cryomodules.

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Section: Cryostatmentioning

confidence: 99%

Cryogenic performance of a conduction-cooling splittable quadrupole magnet for ILC cryomodules

Kimura¹,

Andreev²,

Kashikhin³

et al. 2014

AIP Conference Proceedings

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“…Xu, et al reported that the vibration displacement was reduced by optimizing the wall thickness of regenerators and pulse tubes and by splitting the regenerators and pulse tubes with a thin tube [3]. In REFERENCE 3, the typical vibration displacement of less than ±3 µm had been achieved with minimum impact on performance of a 0.5 W 4 K pulse tube cryocooler, SRP-062B.…”

Section: Introductionmentioning

confidence: 99%

Development of high efficiency 4 K two-stage pulse tube cryocoolers with split valve unit

Nakano¹,

Xu²,

Takayama³

et al. 2012

AIP Conference Proceedings

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SHI has been continuously improving the efficiency and reducing the vibration of a 4 K pulse tube cryocooler. A high-efficiency 4 K pulse tube cryocooler with a split or a remote valve unit has been developed. The valve unit of the cryocooler is split from the cold head by one flexible gas line and two stainless pipes. The experimental data of a highefficiency pulse tube cryocooler with a split or a remote valve unit is reported in this paper. The diameter of the gas lines between the valve unit and the cold head is optimized. The wall thickness of the tubes on the cylinder is optimized for low vibration with minimum impact on cooling performance. The typical vibration displacement is ±10.3 µm at the first stage and ±14.6 µm at the second stage when the compressor is operated at 50 Hz. When the valve unit is split with 1 m lines, the cooling capacity is reduced because of increased pressure drop and dead volume. The minimum temperature of a prototype unit is 23.0 K at the first stage and 2.30 K at the second stage when the compressor is operated at 50 Hz, and 22.3 K and 2.39 K when the compressor is operated at 60 Hz. A typical cooling capacity of the prototype unit is 35 W at 41.8 K on the first stage and 0.9 W at 4.05 K on the second stage when the compressor is operated at 50 Hz and 35 W at 41.8 K on the first stage and 0.9 W at 4.07 K when the compressor is operated at 60 Hz.

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Low input power 4 K pulse tube cryocooler driven by an inverter helium compressor: Intrinsic temperature oscillations and mechanical vibrations

Schmidt

Spagna

et al. 2020

Cryogenics

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Study of low vibration 4 K pulse tube cryocoolers

Cited by 8 publications

References 5 publications

Cryogenic performance of a conduction-cooling splittable quadrupole magnet for ILC cryomodules

Cryogenic performance of a conduction-cooling splittable quadrupole magnet for ILC cryomodules

Development of high efficiency 4 K two-stage pulse tube cryocoolers with split valve unit

Low input power 4 K pulse tube cryocooler driven by an inverter helium compressor: Intrinsic temperature oscillations and mechanical vibrations

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