[PAST EVENT] Liang Zhao: Applied Science Dissertation Defense

June 13, 2014
10am - 12pm
Small Hall, Room 122
300 Ukrop Way
Williamsburg, VA 23185Map this location

Niobium cavities are important components in modern particle accelerators based on superconducting radio frequency (SRF) technology. The interior of SRF cavities are cleaned and polished in order to produce high accelerating field and low power dissipation on the cavity wall. Current polishing methods, buffered chemical polishing (BCP) and electro-polishing (EP), have their advantages and limitations. Laser is proposed as a promising "green" alternative polishing tool to traditional methods, because no chemistry is needed during laser polishing. This dissertation starts with insights into the interests and issues in the traditional polishing processes. And then we show that smoothing effect was achieved with laser polishing by carefully choosing experimental parameters.


Liang Zhao was born on the 25th of October, 1981 in Shenyang City, Liaoning Province, China. She received her Bachelor of Science in Materials Science and Engineering at Beihang University in July, 2004. She received her Master of Science at Beihang University in April, 2007 with a concentration in Materials Physics and Chemistry. She entered the College of William & Mary in the fall of 2007, and began working with Dr. Michael Kelley in the Applied Science Department. One year later she joined Dr. Charles Reece's group at SRF Institute at Jefferson Lab to work on the surface polishing of niobium.