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TY - CONF AU - Maniscalco, J.T. AU - Gonnella, D. AU - Hall, D.L. AU - Liepe, M. AU - Posen, S. ED - Henderson, Stuart ED - Akers, Evelyn ED - Satogata, Todd ED - Schaa, Volker R.W. TI - Hc2 Measurements of Nb3Sn and Nitrogen-doped Niobium using Physical Property Measurement System J2 - Proc. of IPAC2015, Richmond, VA, USA, May 3-8, 2015 C1 - Richmond, VA, USA T2 - International Particle Accelerator Conference T3 - 6 LA - english AB - The measurement of the upper critical field of a type-2 superconductor, Hc2, is an important step in determining its superconducting properties, and therefore its suitability as a material in SRF cavities. However, measuring Hc2 directly can be challenging, as performing electrical measurements causes changes in the very properties one seeks to measure. We present a method for extracting Hc2 from resistivity measurements made near the transition temperature for varied applied fields and excitation currents. We also present results of these measurements made on Nb3Sn and nitrogen-doped niobium. PB - JACoW CP - Geneva, Switzerland SP - 3458 EP - 3461 KW - niobium KW - SRF KW - controls KW - superconductivity KW - radio-frequency DA - 2015/06 PY - 2015 SN - 978-3-95450-168-7 DO - 10.18429/JACoW-IPAC2015-WEPTY075 UR - http://jacow.org/ipac2015/papers/wepty075.pdf ER -