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TY - CONF AU - Porshyn, V. AU - Bürger, H. AU - Lützenkirchen-Hecht, D. AU - Serbun, P. AU - Soykarci, S. ED - Koscielniak, Shane ED - Satogata, Todd ED - Schaa, Volker RW ED - Thomson, Jana TI - Laser Treatment of Niobium Surface for SRF Aplications J2 - Proc. of IPAC2018, Vancouver, BC, Canada, April 29-May 4, 2018 C1 - Vancouver, BC, Canada T2 - International Particle Accelerator Conference T3 - 9 LA - english AB - We report on a laser surface treatment of high purity niobium (110) single crystals. Typical surface defects like scratches, pits, sharp rims and holes were eliminated by a focused pulsed ns-laser beam. A laser fluence of about 0.68 J/cm² and 40 - 80 pulses per spot were required to induce well detectable surface modifications. The remelted surface was sufficiently smooth, but exhibited also a number of wave structures. Thus, the surface roughness slightly increased with increasing number of pulses. Finally, boiling traces and μm-deep ablation were observed and studied as well. Local field electron emission measurements showed no emission up to 700 MV/m from a moderate remelted area below the boiling point. PB - JACoW Publishing CP - Geneva, Switzerland SP - 2387 EP - 2390 KW - laser KW - cavity KW - niobium KW - experiment KW - electron DA - 2018/06 PY - 2018 SN - 978-3-95450-184-7 DO - 10.18429/JACoW-IPAC2018-WEPMF010 UR - http://jacow.org/ipac2018/papers/wepmf010.pdf ER -