002891667 001__ 2891667
002891667 003__ SzGeCERN
002891667 005__ 20240318095503.0
002891667 0247_ $$2DOI$$a10.1109/tasc.2023.3243459
002891667 0248_ $$aoai:cds.cern.ch:2891667$$pcerncds:CERN
002891667 035__ $$9https://inspirehep.net/api/oai2d$$aoai:inspirehep.net:2766164$$d2024-03-12T13:08:21Z$$h2024-03-14T05:00:20Z$$mmarcxml
002891667 035__ $$9Inspire$$a2766164
002891667 041__ $$aeng
002891667 100__ $$aTurner, Daniel Andrew$$uLancaster U.
002891667 245__ $$9submitter$$aInvestigating the Superconducting Properties and Surface Morphology of Sputtered Nb Films on Cu Due to Laser Treatment
002891667 260__ $$c2023
002891667 300__ $$a12 p
002891667 520__ $$9submitter$$aBulk niobium is currently the material of choice for superconducting radio frequency (SRF) cavities and is a well matured process. However, it is possible that SRF cavities could be further improved beyond bulk Nb by sputtering thin Nb films onto Cu cavities. Copper has a greater thermal conductivity than Nb and is also easier to machine, while sputtering films on the surface reduces the amount of Nb used to fabricate the whole cavity. However, sputtering Nb on Cu produces other issues, for example, the surface quality of the Cu affects the quality of the Nb deposited on the surface and therefore the superconducting parameters. As the Nb on the surface is not perfect, the magnetic field produced by the RF can enter the cavity earlier than expected, producing RF losses, which can in turn lead to a quench. One approach is to treat the Nb post deposition by irradiating the surface using a laser to polish the surface of the Nb and increase the surface magnetic field that the cavity can maintain while remaining in the Meissner state. A magnetic field penetration experiment designed and built at Daresbury Laboratory has been used to measure the field of full flux penetration to characterize the effect of the laser treatment on the superconducting properties of the Nb. Surface characterization and the response of the Nb in a dc magnetic field have also been performed to try and provide an explanation for the change in the superconducting properties. The results demonstrate that the laser treatment can lead to an increase in the magnetic field at which the flux penetrates from one side of the sample to the other, thus it could potentially improve the performance of Nb coated RF cavities.
002891667 542__ $$dIEEE$$g2023
002891667 65017 $$2INSPIRE$$aEngineering
002891667 65017 $$2INSPIRE$$aAccelerators and Storage Rings
002891667 690C_ $$aARTICLE
002891667 690C_ $$aCERN
002891667 700__ $$aMalyshev, O B$$uCockcroft Inst. Accel. Sci. Tech.
002891667 700__ $$aBurt, G$$uLancaster U.
002891667 700__ $$aSeiler, E$$uBratislava, Inst. Phys.
002891667 700__ $$aRies, R$$uBratislava, Inst. Phys.
002891667 700__ $$aMedvids, A$$uRiga Tech. U.
002891667 700__ $$aOnufrijevs, P$$uRiga Tech. U.
002891667 700__ $$aValizadeh, R$$uCockcroft Inst. Accel. Sci. Tech.
002891667 700__ $$aSublet, A$$uCERN
002891667 700__ $$aPira, C$$uINFN, Legnaro
002891667 700__ $$aChyhyrynets, E$$uINFN, Legnaro
002891667 700__ $$aVogel, M$$uSiegen U.
002891667 700__ $$aLeith, S$$uSiegen U.
002891667 700__ $$aJunginger, T$$uVictoria U.
002891667 773__ $$c1-12$$n4$$pIEEE Trans. Appl. Supercond.$$v33$$y2023
002891667 960__ $$a13
002891667 980__ $$aARTICLE