Installation of a superconducting magnet in a cryogen-free dilution refrigerator

Hideki Yayama, Michihiro Yoshimura

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

A cryogen-free dilution refrigerator equipped with an 8 T superconducting magnet is developed. The dilution unit and the magnet are cooled together by a common Gifford-McMahon refrigerator in the same vacuum chamber. A heat flow from room temperature terminals through a pair of copper current leads is well absorbed by thermal anchors connected to a 1st stage of the GM refrigerator. Between the 1st stage and the 2nd stage, a pair of flexible high-T C DyBCO coated conductors is used as a material for the current leads to reduce the heat leakage to the magnet. The dilution cycle is not affected by coexistence of the magnet, because the heat load imposed by the magnet is much less than that by the dilution unit. When a quench event happens, the temperatures of the magnet and a 4 K plate of the dilution unit rise rapidly up to 20 K, but safely recover in 18 min without causing serious trouble in the dilution process.

Original languageEnglish
Article number012056
JournalJournal of Physics: Conference Series
Volume150
DOIs
Publication statusPublished - Jan 1 2009

Fingerprint

refrigerators
superconducting magnets
installing
dilution
magnets
heat
vacuum chambers
heat transmission
leakage
conductors
copper
cycles
room temperature

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

Installation of a superconducting magnet in a cryogen-free dilution refrigerator. / Yayama, Hideki; Yoshimura, Michihiro.

In: Journal of Physics: Conference Series, Vol. 150, 012056, 01.01.2009.

Research output: Contribution to journalArticle

@article{6cfaec715f4046cc9f8ede468872a330,
title = "Installation of a superconducting magnet in a cryogen-free dilution refrigerator",
abstract = "A cryogen-free dilution refrigerator equipped with an 8 T superconducting magnet is developed. The dilution unit and the magnet are cooled together by a common Gifford-McMahon refrigerator in the same vacuum chamber. A heat flow from room temperature terminals through a pair of copper current leads is well absorbed by thermal anchors connected to a 1st stage of the GM refrigerator. Between the 1st stage and the 2nd stage, a pair of flexible high-T C DyBCO coated conductors is used as a material for the current leads to reduce the heat leakage to the magnet. The dilution cycle is not affected by coexistence of the magnet, because the heat load imposed by the magnet is much less than that by the dilution unit. When a quench event happens, the temperatures of the magnet and a 4 K plate of the dilution unit rise rapidly up to 20 K, but safely recover in 18 min without causing serious trouble in the dilution process.",
author = "Hideki Yayama and Michihiro Yoshimura",
year = "2009",
month = "1",
day = "1",
doi = "10.1088/1742-6596/150/1/012056",
language = "English",
volume = "150",
journal = "Journal of Physics: Conference Series",
issn = "1742-6588",
publisher = "IOP Publishing Ltd.",

}

TY - JOUR

T1 - Installation of a superconducting magnet in a cryogen-free dilution refrigerator

AU - Yayama, Hideki

AU - Yoshimura, Michihiro

PY - 2009/1/1

Y1 - 2009/1/1

N2 - A cryogen-free dilution refrigerator equipped with an 8 T superconducting magnet is developed. The dilution unit and the magnet are cooled together by a common Gifford-McMahon refrigerator in the same vacuum chamber. A heat flow from room temperature terminals through a pair of copper current leads is well absorbed by thermal anchors connected to a 1st stage of the GM refrigerator. Between the 1st stage and the 2nd stage, a pair of flexible high-T C DyBCO coated conductors is used as a material for the current leads to reduce the heat leakage to the magnet. The dilution cycle is not affected by coexistence of the magnet, because the heat load imposed by the magnet is much less than that by the dilution unit. When a quench event happens, the temperatures of the magnet and a 4 K plate of the dilution unit rise rapidly up to 20 K, but safely recover in 18 min without causing serious trouble in the dilution process.

AB - A cryogen-free dilution refrigerator equipped with an 8 T superconducting magnet is developed. The dilution unit and the magnet are cooled together by a common Gifford-McMahon refrigerator in the same vacuum chamber. A heat flow from room temperature terminals through a pair of copper current leads is well absorbed by thermal anchors connected to a 1st stage of the GM refrigerator. Between the 1st stage and the 2nd stage, a pair of flexible high-T C DyBCO coated conductors is used as a material for the current leads to reduce the heat leakage to the magnet. The dilution cycle is not affected by coexistence of the magnet, because the heat load imposed by the magnet is much less than that by the dilution unit. When a quench event happens, the temperatures of the magnet and a 4 K plate of the dilution unit rise rapidly up to 20 K, but safely recover in 18 min without causing serious trouble in the dilution process.

UR - http://www.scopus.com/inward/record.url?scp=65649139664&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=65649139664&partnerID=8YFLogxK

U2 - 10.1088/1742-6596/150/1/012056

DO - 10.1088/1742-6596/150/1/012056

M3 - Article

VL - 150

JO - Journal of Physics: Conference Series

JF - Journal of Physics: Conference Series

SN - 1742-6588

M1 - 012056

ER -