| Paper | Title | Page |
|---|
| WEP65 | Study on the buffered electropolishing Jacquet layers on niobium cavity | 660 |
| | - E. D. Wang, T. M. Xin, X. Y. Lu, L. M. Yang, L. Lin, S. Jin, K. Zhao
IHIP, Peking University
| |
| | Buffered electropolishing on niobium cavities has been
developed at Peking University. Some small niobium
samples have been polished very smoothly. An
experiment has demonstrated that both of the liquid and
solid Jacquet layers exist on the surface of anode
simultaneously. The results of experiment, that more than
70% voltage is taken by the Jacquet layers, show us that
the cathode shape is not a necessary condition for
polishing the dumbbell. Flat cathode is available to polish
the dumbbell. We have observed though the experiment
that the different fluid liquid Jacquet layer movements
could cause the different results on the dumbbell surface.
These studies show that BEP can offer a smooth surface
on niobium cavities. | |
| WEP86 | Niobium sample surface treatment by buffered electropolishing | 724 |
| | - S. Jin, L. Lin, L. M. Yang, E. D. Wang, T. M. Xin, X. Y. Lu, K. Zhao
IHIP, Peking University
| |
| | The electrolyte of buffered electropolishing (BEP) is
consisted of hydrofluoric, sulfuric and lactic acids. In the
present work, the process of BEP has been familiarized
and the main parameters were investigated. It was
demonstrated that the polishing rate of BEP had a linear
relationship with current density; therefore the polishing
rate can be controlled via current density, which make the
control of BEP easier. Through inspection using a
metallographic optical microscope (MOM) and an Atomic
Force Microscope (AFM), it is proved that Nb surfaces
treated by BEP were much smoother than those treated by
the electropolishing (EP) process widely used in the
superconducting radio frequency community. | |