Protection

Iwasa, Y.

doi:10.1007/b112047_8

Cited by 1 publication

(1 citation statement)

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“…Based on the equations of adiabatic heating under constant-current mode according to Ref. [24], it takes more than 1 s for the resistive zone to heat up from 4.2 K to 200 K. This 1 s heating time is considered to be sufficient for quench protection. In addition, the inter-turn resistance in MI-REBCO coils drops quickly when the coils are cycled, especially in 4.2 K, which will increase the time constant [25].…”

Section: Design Parametersmentioning

confidence: 99%

Design of a 20 T Class REBCO Insert in a 15 T Low Temperature Superconducting Magnet

et al. 2021

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A 20 T REBCO insert magnet has been designed considering a 15 T/150 mm background field generated by an LTS magnet. A two-nested-coil structure was chosen. The target of this project is to generate a 20 T/80 mm user field by inserting the outer MI-REBCO coil (Coil 2) first, then try to reach 35 T by inserting the inner NI-REBCO test coil (Coil 1). Coil 2 will be wound by copper packed, 185-μm thick REBCO tapes co-wound with 50-μm thick Hastelloy tapes. Coil 1 will be no-insulated wound by 65-μm thick REBCO tapes. Two mechanical models were built to estimate the stress distribution inside the HTS coils during operation. The influence of the screening current distribution on stress was discussed. The unbalanced force caused by the coil misalignment was also simulated. The 20 T HTS insert magnet is planned to be built and tested in 2021. The progress of coil winding and preliminary test results at 77 K were presented.

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Section: Design Parametersmentioning

confidence: 99%