To measure the superconducting material properties on cylindrical samples a system has been designed and built.  On the other side a coaxial TE₀₁₁ cavity has been designed and built to study the RF performance on the same sample.  The purpose of this effort is to investigate the possible co-relation between DC and RF properties of superconductors.  A systematic study has been presented on the four Ingot-Niobium received from CBMM, Brazil.  The samples are subjected to different surface treatments such as BCP, 600°C heat treatment and low temperature baking (LTB) at different temperatures.  After each treatment different material properties such as bulk magnetization, surface magnetization, thermal conductivity an penetration depths are measured.  The ration of B_C3/B_C2 with the Shmidt's model gives the thickness of the contaminated layer on the surface.  The change in the thickness is over few hundreds nanometer.  The oxygen diffusion model for our LTB duration predicts about 8mm diffusion.  So the LTB improvement of the of the SRF cavity might be due to other effect yet to be established.

Thursday, June 9, 2009

11:00 - 12:00 a.m.
Test Lab, Room 204

Talk Slides: (Slides)


For more information, please contact Dr. Alex Bogacz or Anne-Marie Valente.