27 August 2017 to 1 September 2017
RAI Congress Center, Amsterdam, The Netherlands
Europe/Amsterdam timezone

Construction and Test Results of Coils 2 and 3 of a 3-Nested-Coil 800-MHz REBCO Insert for the MIT 1.3-GHz LTS/HTS NMR Magnet

29 Aug 2017, 13:15
1h 45m
Postera Area

Postera Area

Poster Presentation of 1h45m D1 - Magnets for NMR Tue-Af-Po2.05

Speaker

Dongkeun Park (Massachusetts Institute of Technology, Francis Bitter Magnet Laboratory, Plasma Science and Fusion Center)

Description

We present construction and test results of Coils 2 and 3 of a 3-nested-coil 800-MHz (18.8 T) REBCO insert (H800) for the MIT 1.3-GHz LTS/HTS NMR magnet currently under construction. Each of the 3-nested H800 coils is a stack of no-insulation REBCO double-pancakes (DPs). The innermost 8.7-T Coil 1 (26 DPs) was completed in 2016; the middle 5.7-T Coil 2 (32 DPs) has been fully assembled and tested; and for the outermost 4.4-T Coil 3, its 38 DPs have been wound and preliminary tests performed to characterize the DP at 77 K. In this paper we present first results of Coil 2 and then those of Coil 3. Included in the Coil 2 test results are: 1) 77-K critical current, index number, turn-to-turn contact resistivity, and charging-delay time constant for all DPs; 2) final stacking order of the 32 DPs, optimized to maximize Coil 2’s critical current margin and minimize its Joule dissipation from the pancake-to-pancake joints; 3) procedure to experimentally determine and apply a room-temperature preload; 4) 77-K and 4.2-K test results including resistance of pancake-to-pancake joints, before and after each of 64 pancakes was over-banded with 76-µm-thick stainless steel tape for a total radial thickness of 5 mm. Presented for Coil 3 are 77-K critical current, index number, turn-to-turn contact resistivity, and charging-delay time constant for all DPs.
Acknowledgement: Research reported in this publication was supported by the National Institute of General Medical Sciences of the National Institutes of Health

Submitters Country United States

Primary author

Dongkeun Park (Massachusetts Institute of Technology, Francis Bitter Magnet Laboratory, Plasma Science and Fusion Center)

Co-authors

Juan Bascuñán (Massachusetts Institute of Technology, Francis Bitter Magnet Laboratory, Plasma Science and Fusion Center) Philip Michael (Massachusetts Institute of Technology, Francis Bitter Magnet Laboratory, Plasma Science and Fusion Center) Jiho Lee (Massachusetts Institute of Technology, Francis Bitter Magnet Laboratory, Plasma Science and Fusion Center) Seungyong Hahn (Seoul National University / National High Magnetic Field Lab.) Yukikazu Iwasa (Massachusetts Institute of Technology, Francis Bitter Magnet Laboratory, Plasma Science and Fusion Center)

Presentation Materials