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In 2007 upgrading of superconducting parameters of niobium layers obtained by vacuum arc deposition was carried out at Roma Tor Vergata University by using negative pulsed bias of a coated substrate [1]. A series of Nb coatings on sapphire samples have been performed in a planar vacuum arc device at both constant and pulsed negative substrate bias. The pulsed bias was reached by using a dc power supply connected in series with a keying module (designed and delivered by the Dept. of Plasma Physics and Technology, SINS) controlled by a pulse generator. Constant bias voltage was varied between~ 40V and~ 80V respectively to the grounded anode of the arc system. Pulsed bias with~ 60V amplitude was applied at pulse frequencies of 1 kHz, 10 kHz, 40 kHz and 100 kHz and duty factor values of 10%, 30% and 50%. The layers generated were tested for RRR. The …
Publication date: 
28 Dec 2007

J Lorkiewicz

Biblio References: 
Volume: 6937 Pages: 69370R
Proceedings of SPIE