SRF2011 - List of Authors (Sawabe, M.)

Paper	Title	Page
TUPO037	Study on Electro-Polishing Process by Niobium-Plate Sample With Artificial Pits	461
	T. Saeki, H. Hayano, S. Kato, M. Nishiwaki, M. Sawabe KEK, Ibaraki, Japan W.A. Clemens, R.L. Geng, R. Manus JLAB, Newport News, Virginia, USA P.V. Tyagi Sokendai, Ibaraki, Japan
	The Electro-polishing (EP) process is the best candidate of final surface-treatment for the production of ILC cavities. Nevertheless, the development of defects on the inner-surface of the Superconducting RF cavity during EP process has not been studied by experimental method. We made artificial pits on the surface of a Nb-plate sample and observed the development of the pit-shapes after each step of 30um-EP process where 120um was removed by EP in total. This article describes the results of this EP-test of Nb-sample with artificial pits.

TUPO039	Long-Term Monitoring of 2nd–Period EP-Electrolyte in STF-EP Facility at KEK	467
	M. Sawabe, H. Hayano, A. Komiya, H. Monjushiro, T. Saeki, M. Satou KEK, Ibaraki, Japan
	We have constructed an Electro-polishing (EP) Facility in the Superconducting RF Test Facility (STF) at KEK at the end of 2007. We have begun to operate the EP facility since 2008 and performed the EP process of cavity about 140 times up to now. During this period, we exchanged EP-electrolyte twice in the 2,000L tank. We are performing EP processes with the 3rd–period EP-electrolyte at the present moment. By this report, we report the long-term monitoring results of the 2nd–period EP-electrolyte used from May, 2009 to July, 2010.

Paper

Title

Page

Study on Electro-Polishing Process by Niobium-Plate Sample With Artificial Pits

461

T. Saeki, H. Hayano, S. Kato, M. Nishiwaki, M. Sawabe
KEK, Ibaraki, Japan
W.A. Clemens, R.L. Geng, R. Manus
JLAB, Newport News, Virginia, USA
P.V. Tyagi
Sokendai, Ibaraki, Japan

The Electro-polishing (EP) process is the best candidate of final surface-treatment for the production of ILC cavities. Nevertheless, the development of defects on the inner-surface of the Superconducting RF cavity during EP process has not been studied by experimental method. We made artificial pits on the surface of a Nb-plate sample and observed the development of the pit-shapes after each step of 30um-EP process where 120um was removed by EP in total. This article describes the results of this EP-test of Nb-sample with artificial pits.

TUPO039

Long-Term Monitoring of 2nd–Period EP-Electrolyte in STF-EP Facility at KEK

467

M. Sawabe, H. Hayano, A. Komiya, H. Monjushiro, T. Saeki, M. Satou
KEK, Ibaraki, Japan

We have constructed an Electro-polishing (EP) Facility in the Superconducting RF Test Facility (STF) at KEK at the end of 2007. We have begun to operate the EP facility since 2008 and performed the EP process of cavity about 140 times up to now. During this period, we exchanged EP-electrolyte twice in the 2,000L tank. We are performing EP processes with the 3rd–period EP-electrolyte at the present moment. By this report, we report the long-term monitoring results of the 2nd–period EP-electrolyte used from May, 2009 to July, 2010.