Compact HTS cryogen-free magnet for magneto-optics research setup

Y. Wolfus; A. Friedman; F. Kopansky; Y. Yeshurun; Z. Bar-Haim; Z. Ron; N. Pundak

doi:10.1109/tasc.2005.849642

Compact HTS cryogen-free magnet for magneto-optics research setup

Y. Wolfus
, A. Friedman
, F. Kopansky
, Y. Yeshurun
, Z. Bar-Haim
, Z. Ron
, N. Pundak

Bar-Ilan University
RICOR-CryogenicandVacuum Systems

Research output: Contribution to journal › Article › peer-review

4 Scopus citations

Abstract

Small working distances between the objective lenses and the inspected samples in magneto-optical (MO) setups limit the volume available for external magnetic field generation coils. Air or water-cooled copper coils are commonly used for field generation, however these coils usually make it possible to attain limited fields of the order of 10-50 mT, in continuous operating mode. HTS coils offer a unique and cost effective solution in such cases of limited space. A compact, 0.4 T, cryogen-free, HTS magnet has been designed, built and tested in a MO setup. The magnet is made of 3, 100 turns single pancakes, mounted on the second stage of a two-stage cryocooler. The HTS coil operates at about T = 45 K and generates 0.4 T in a warm bore of 30 mm diameter. Minimization of metal components in the coil makes it possible to attain field ramp rates of 7.4 T/sec with a coil charging voltage of 20 V. Initial cool-down time of the magnet takes less than 5 hours. The magnet design and performances are described in detail and serve as an example for solutions that HTS technology may offer in limited space applications.

Original language	English
Pages (from-to)	2320-2323
Number of pages	4
Journal	IEEE Transactions on Applied Superconductivity
Volume	15
Issue number	2 PART II
DOIs	https://doi.org/10.1109/tasc.2005.849642
State	Published - Jun 2005

Bibliographical note

Funding Information:
Manuscript received October 5, 2004. This work was supported by the Israeli Ministry of Industry and Commerce under funds. Y. Wolfus, A. Friedman, F. Kopansky, and Y. Yeshurun are with the Department of Physics, Institute of Superconductivity, Bar-Ilan University, Ramat-Gan 52900, Israel (e-mail: [email protected]). Z. Bar-Haim, Z. Ron, and N. Pundak are with RICOR-Cryogenic&Vacuum Systems, En Harod Ihud 18960, Israel (e-mail: [email protected]). Digital Object Identifier 10.1109/TASC.2005.849642 Fig. 1. Typical MO setup including a sample cryostat (1), cold pillar with optical window (2) and polarized microscope with objective wheel (3).

Funding

Manuscript received October 5, 2004. This work was supported by the Israeli Ministry of Industry and Commerce under funds. Y. Wolfus, A. Friedman, F. Kopansky, and Y. Yeshurun are with the Department of Physics, Institute of Superconductivity, Bar-Ilan University, Ramat-Gan 52900, Israel (e-mail: [email protected]). Z. Bar-Haim, Z. Ron, and N. Pundak are with RICOR-Cryogenic&Vacuum Systems, En Harod Ihud 18960, Israel (e-mail: [email protected]). Digital Object Identifier 10.1109/TASC.2005.849642 Fig. 1. Typical MO setup including a sample cryostat (1), cold pillar with optical window (2) and polarized microscope with objective wheel (3).

Funders
Israeli Ministry of Industry and Commerce

Keywords

BSCCO tape
Cryogen-free magnet
HTS coil
Magneto-optical setup

Access to Document

10.1109/tasc.2005.849642

Cite this

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title = "Compact HTS cryogen-free magnet for magneto-optics research setup",

abstract = "Small working distances between the objective lenses and the inspected samples in magneto-optical (MO) setups limit the volume available for external magnetic field generation coils. Air or water-cooled copper coils are commonly used for field generation, however these coils usually make it possible to attain limited fields of the order of 10-50 mT, in continuous operating mode. HTS coils offer a unique and cost effective solution in such cases of limited space. A compact, 0.4 T, cryogen-free, HTS magnet has been designed, built and tested in a MO setup. The magnet is made of 3, 100 turns single pancakes, mounted on the second stage of a two-stage cryocooler. The HTS coil operates at about T = 45 K and generates 0.4 T in a warm bore of 30 mm diameter. Minimization of metal components in the coil makes it possible to attain field ramp rates of 7.4 T/sec with a coil charging voltage of 20 V. Initial cool-down time of the magnet takes less than 5 hours. The magnet design and performances are described in detail and serve as an example for solutions that HTS technology may offer in limited space applications.",

keywords = "BSCCO tape, Cryogen-free magnet, HTS coil, Magneto-optical setup",

author = "Y. Wolfus and A. Friedman and F. Kopansky and Y. Yeshurun and Z. Bar-Haim and Z. Ron and N. Pundak",

note = "Funding Information: Manuscript received October 5, 2004. This work was supported by the Israeli Ministry of Industry and Commerce under funds. Y. Wolfus, A. Friedman, F. Kopansky, and Y. Yeshurun are with the Department of Physics, Institute of Superconductivity, Bar-Ilan University, Ramat-Gan 52900, Israel (e-mail: [email protected]). Z. Bar-Haim, Z. Ron, and N. Pundak are with RICOR-Cryogenic\&Vacuum Systems, En Harod Ihud 18960, Israel (e-mail: [email protected]). Digital Object Identifier 10.1109/TASC.2005.849642 Fig. 1. Typical MO setup including a sample cryostat (1), cold pillar with optical window (2) and polarized microscope with objective wheel (3).",

year = "2005",

month = jun,

doi = "10.1109/tasc.2005.849642",

language = "אנגלית",

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AU - Wolfus, Y.

AU - Friedman, A.

AU - Kopansky, F.

AU - Yeshurun, Y.

AU - Bar-Haim, Z.

AU - Ron, Z.

AU - Pundak, N.

N1 - Funding Information: Manuscript received October 5, 2004. This work was supported by the Israeli Ministry of Industry and Commerce under funds. Y. Wolfus, A. Friedman, F. Kopansky, and Y. Yeshurun are with the Department of Physics, Institute of Superconductivity, Bar-Ilan University, Ramat-Gan 52900, Israel (e-mail: [email protected]). Z. Bar-Haim, Z. Ron, and N. Pundak are with RICOR-Cryogenic&Vacuum Systems, En Harod Ihud 18960, Israel (e-mail: [email protected]). Digital Object Identifier 10.1109/TASC.2005.849642 Fig. 1. Typical MO setup including a sample cryostat (1), cold pillar with optical window (2) and polarized microscope with objective wheel (3).

PY - 2005/6

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N2 - Small working distances between the objective lenses and the inspected samples in magneto-optical (MO) setups limit the volume available for external magnetic field generation coils. Air or water-cooled copper coils are commonly used for field generation, however these coils usually make it possible to attain limited fields of the order of 10-50 mT, in continuous operating mode. HTS coils offer a unique and cost effective solution in such cases of limited space. A compact, 0.4 T, cryogen-free, HTS magnet has been designed, built and tested in a MO setup. The magnet is made of 3, 100 turns single pancakes, mounted on the second stage of a two-stage cryocooler. The HTS coil operates at about T = 45 K and generates 0.4 T in a warm bore of 30 mm diameter. Minimization of metal components in the coil makes it possible to attain field ramp rates of 7.4 T/sec with a coil charging voltage of 20 V. Initial cool-down time of the magnet takes less than 5 hours. The magnet design and performances are described in detail and serve as an example for solutions that HTS technology may offer in limited space applications.

AB - Small working distances between the objective lenses and the inspected samples in magneto-optical (MO) setups limit the volume available for external magnetic field generation coils. Air or water-cooled copper coils are commonly used for field generation, however these coils usually make it possible to attain limited fields of the order of 10-50 mT, in continuous operating mode. HTS coils offer a unique and cost effective solution in such cases of limited space. A compact, 0.4 T, cryogen-free, HTS magnet has been designed, built and tested in a MO setup. The magnet is made of 3, 100 turns single pancakes, mounted on the second stage of a two-stage cryocooler. The HTS coil operates at about T = 45 K and generates 0.4 T in a warm bore of 30 mm diameter. Minimization of metal components in the coil makes it possible to attain field ramp rates of 7.4 T/sec with a coil charging voltage of 20 V. Initial cool-down time of the magnet takes less than 5 hours. The magnet design and performances are described in detail and serve as an example for solutions that HTS technology may offer in limited space applications.

KW - BSCCO tape

KW - Cryogen-free magnet

KW - HTS coil

KW - Magneto-optical setup

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SN - 1051-8223

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JO - IEEE Transactions on Applied Superconductivity

JF - IEEE Transactions on Applied Superconductivity

IS - 2 PART II

ER -

Compact HTS cryogen-free magnet for magneto-optics research setup

Abstract

Bibliographical note

Funding

Keywords

Access to Document

Other files and links

Fingerprint

Cryogen-free HTS 20kVA transformer

Cite this

Compact HTS cryogen-free magnet for magneto-optics research setup

Abstract

Bibliographical note

Funding

Keywords

Access to Document

Other files and links

Fingerprint

Equipment

Cryogen-free HTS 20kVA transformer

Cite this