title: Solid cryogen: a cooling system for future MgB2MRI magnet.
abstract: An efficient cooling system and the superconducting magnet are essential components of magnetic resonance imaging (MRI) technology. Herein, we report a solid nitrogen (SN2) cooling system as a valuable cryogenic feature, which is targeted for easy usability and stable operation under unreliable power source conditions, in conjunction with a magnesium diboride (MgB2) superconducting magnet. The rationally designed MgB2/SN2cooling system was first considered by conducting a finite element analysis simulation, and then a demonstrator coil was empirically tested under the same conditions. In the SN2cooling system design, a wide temperature distribution on the SN2chamber was observed due to the low thermal conductivity of the stainless steel components. To overcome this temperature distribution, a copper flange was introduced to enhance the temperature uniformity of the SN2chamber. In the coil testing, an operating current as high as 200 A was applied at 28 K (below the critical current) without any operating or thermal issues. This work was performed to further the development of SN2cooled MgB2superconducting coils for MRI applications.
authors.affiliation: Institute for Superconducting and Electronic Materials, Australian Institute for Innovative Materials, University of Wollongong, Squires Way, Innovation Campus, North Wollongong, New South Wales 2500, Australia.
authors.forename: Dipak
authors.initials: D
authors.lastname: Patel
authors.affiliation: Institute for Superconducting and Electronic Materials, Australian Institute for Innovative Materials, University of Wollongong, Squires Way, Innovation Campus, North Wollongong, New South Wales 2500, Australia.
authors.forename: Md Shahriar Al
authors.initials: MS
authors.lastname: Hossain
authors.affiliation: Institute for Superconducting and Electronic Materials, Australian Institute for Innovative Materials, University of Wollongong, Squires Way, Innovation Campus, North Wollongong, New South Wales 2500, Australia.
authors.forename: Wenbin
authors.initials: W
authors.lastname: Qiu
authors.affiliation: Institute for Superconducting and Electronic Materials, Australian Institute for Innovative Materials, University of Wollongong, Squires Way, Innovation Campus, North Wollongong, New South Wales 2500, Australia.
authors.forename: Hyunseock
authors.initials: H
authors.lastname: Jie
authors.affiliation: Institute for Superconducting and Electronic Materials, Australian Institute for Innovative Materials, University of Wollongong, Squires Way, Innovation Campus, North Wollongong, New South Wales 2500, Australia.
authors.forename: Yusuke
authors.initials: Y
authors.lastname: Yamauchi
authors.affiliation: Department of Physics, College of Science and Technology, Nihon University, Tokyo 101-8308, Japan.
authors.forename: Minoru
authors.initials: M
authors.lastname: Maeda
authors.affiliation: Hyper Tech Research, Inc., 539 Industrial Mile Road, Columbus, Oh 43228, USA.
authors.forename: Mike
authors.initials: M
authors.lastname: Tomsic
authors.affiliation: Busan Center, Korea Basic Science Institute, Busan 609-735, Republic of Korea.
authors.forename: Seyong
authors.initials: S
authors.lastname: Choi
authors.affiliation: Institute for Superconducting and Electronic Materials, Australian Institute for Innovative Materials, University of Wollongong, Squires Way, Innovation Campus, North Wollongong, New South Wales 2500, Australia.
authors.forename: Jung Ho
authors.initials: JH
authors.lastname: Kim