000007709 001__ 7709
000007709 005__ 20240531164757.0
000007709 02470 $$2doi$$a10.24868/issn.2515-818X.2020.068
000007709 035__ $$a4498536
000007709 037__ $$aGENERAL
000007709 245__ $$aCryogenics for an HTS degaussing system demonstrator
000007709 269__ $$a2020-10-05
000007709 336__ $$aConference Proceedings
000007709 520__ $$aThis paper describes the design, construction and test results of a high temperature superconducting (HTS) degaussing demonstrator system. Such a system compensates the local disturbance in the earth's magnetic field caused by the ferromagnetic hulls of ships, to prevent detection by active or passive magnetic field sensors. This is done by placing coils around the ship, creating a magnetic field opposing the effect of the earth's magnetic field. Degaussing systems for large naval vessels typically need currents of up to 1 or 2 kAturns, which gives rise to sizeable ohmic losses in conventional copper coils. These losses can be reduced if high temperature superconductors are used, since they have no electrical resistance when cooled down to temperatures below 90 K. For the demonstrator, 3 coils able to generate fields in 2 directions were realized both with HTS and copper to get a representative degaussing performance. A dedicatedly designed cooling system maintains the superconductors at a temperature of 77-85K using (subcooled) liquid nitrogen. Due to the relatively small laboratory scale that this first 1:5m long demonstrator system which was produced, the copper degaussing system is still more efficient than the HTS system because of the cooling power needed. A large fraction of this cooling power is needed to cool away parasitic heat loads, that hardly increases if the size of the system increases. Thereafter the performance of both systems was compared to evaluate on what scale HTS degaussing systems become more efficient than copper degaussing systems.
000007709 542__ $$fCC-BY-4.0
000007709 6531_ $$aHTS
000007709 6531_ $$aDegaussing
000007709 6531_ $$aCryogenics
000007709 6531_ $$aHTS Degaussing
000007709 6531_ $$aMagnetic field
000007709 6531_ $$aEnergy efficiency
000007709 7001_ $$aHanse, I$$uUniversity of Twente, Enschede, The Netherlands
000007709 7001_ $$aWikkerink, DP$$uDelft University of Technology, Delft, The Netherlands
000007709 7001_ $$aVermeer, C$$uUniversity of Twente, Enschede, The Netherlands
000007709 7001_ $$aHolland, HJ$$uUniversity of Twente, Enschede, The Netherlands
000007709 7001_ $$aDhall´e, MMJ$$uUniversity of Twente, Enschede, The Netherlands
000007709 7001_ $$ater Brake, HJM$$uUniversity of Twente, Enschede, The Netherlands
000007709 773__ $$tConference Proceedings of INEC
000007709 773__ $$jINEC 2020
000007709 789__ $$whttps://zenodo.org/record/4498536$$2URL$$eIsIdenticalTo
000007709 85641 $$uhttps://www.imarest.org/events/inec-2020$$yConference website
000007709 8564_ $$9c90d4a30-b4b8-44b7-8513-20a9d9dbd212$$s3985287$$uhttps://library.imarest.org/record/7709/files/INEC_2020_Paper_106.pdf