LASER ANNEALING OF NB COATINGS FOR SUPERCONDUCTING RF ACCELERATING CAVITIES

Authors
RADICIONI E BENVENUTI C BIANCONI M CORRERA L
Citation
E. Radicioni et al., LASER ANNEALING OF NB COATINGS FOR SUPERCONDUCTING RF ACCELERATING CAVITIES, Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment, 365(1), 1995, pp. 28-35
Citations number
8
Categorie Soggetti
Nuclear Sciences & Tecnology","Physics, Particles & Fields","Instument & Instrumentation",Spectroscopy
Journal title
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment → ACNP
ISSN journal
01689002
Volume
365
Issue
1
Year of publication
1995
Pages
28 - 35
Database
ISI
SICI code
0168-9002(1995)365:1<28:LAONCF>2.0.ZU;2-W
Abstract
The effects of laser annealing on niobium films sputter-coated on OFHC copper are reported. It is shown that single shots (40 ns, 5.5 J/cm(2 )) of a XeCl excimer laser result in surface melting and recrystalliza tion of the Nb film, and in turn in the complete removal of surface de fects and in a large increase of grain size and RRR values. This proce dure may be of practical interest to improve the performance of Nb-coa ted RF accelerating superconducting cavities, such as those produced f or the LEP energy upgrade from 55 to about 90 GeV per beam.