SRF2011 - List of Authors (Saeki, T.)

Paper

Title

Page

Status of the 9-Cell Superconducting Cavity R&D for ILC at Hitachi

439

T. Watanuki, T. Semba, M. Watanabe
Hitachi Ltd., Ibaraki-ken, Japan
H. Hayano, E. Kako, S. Noguchi, T. Saeki, T. Shishido, K. Watanabe, Y. Yamamoto
KEK, Ibaraki, Japan

Hitachi is developing 9-cell superconducting cavities for ILC project in collaboration with KEK. We focus on electron beam welding (EBW) and plastic forming techniques. In 2010, Hitachi’s first 9-cell cavity without HOM couplers was completed successfully. Surface treatments and performance test of the cavity were carried out at KEK and the accelerating gradient reached 35.2 MV/m. We have undertaken the next 9-cell cavity with HOM couplers since January 2011. We will report the fabrication procedure and test result of first cavity and the current status of the next cavity.

TUPO032

Updates on R&D of Nondestructive Inspection Systems for SRF Cavities

447

Y. Iwashita, H. Tongu
Kyoto ICR, Uji, Kyoto, Japan
H. Hayano, T. Saeki, K. Watanabe
KEK, Ibaraki, Japan

We are developing high resolution eddy current scan and High density Tmap and X-map. The high resolution eddy current scan showed 100 μm diameter hole with 50μm depth that was drilled on a Nb plate. The surface mount print circuit technology is applied to the high density Tmap and X-map devices, which will be ready soon to test at a vertical test bench. In addition, radiography using Xrays and neutrons are also under study. The results and status will be presented.

Poster TUPO032 [2.362 MB]

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.

THIOB08

Hot topics: Recipes for 9-cell cavity fabrication and preparation

687

T. Saeki
KEK, Ibaraki, Japan

In the mass production of International Linear Collider (ILC), about 16,000 9-cell SRF cavities must be produced for the linac. The current recipe of 9-cell cavity production is not enough for the required cost reduction for ILC. Various ideas for the cost reduction of 9-cell cavity fabrication would be duscussed in this presentation. As the final surface treatment of 9-cell cavity, the Electro-Polishing (EP) is the best candidate to realize high yield rate for high-gradient performance. However, the laboratories in the world are still using different EP parameter-sets for various reasons. In this presentation, the comparison of EP parameters among laboratories would be done and how we can reach to the best parameter sets would be discussed.

Slides THIOB08 [3.108 MB]

THIOA01

Test Results of the International S1-Global Cryomodule

615

Y. Yamamoto, M. Akemoto, S. Fukuda, K. Hara, H. Hayano, N. Higashi, E. Kako, H. Katagiri, Y. Kojima, Y. Kondo, T. Matsumoto, H. Matsushita, S. Michizono, T. Miura, H. Nakai, H. Nakajima, K. Nakanishi, S. Noguchi, N. Ohuchi, T. Saeki, M. Satoh, T. Shidara, T. Shishido, T. Takenaka, A. Terashima, N. Toge, K. Tsuchiya, K. Watanabe, S. Yamaguchi, A. Yamamoto, K. Yokoya, M. Yoshida
KEK, Ibaraki, Japan
C. Adolphsen, C.D. Nantista
SLAC, Menlo Park, California, USA
T.T. Arkan, S. Barbanotti, M.A. Battistoni, H. Carter, M.S. Champion, A. Hocker, R.D. Kephart, J.S. Kerby, D.V. Mitchell, T.J. Peterson, Y.M. Pischalnikov, M.C. Ross, W. Schappert, B.E. Smith
Fermilab, Batavia, USA
A. Bosotti, C. Pagani, R. Paparella, P. Pierini
INFN/LASA, Segrate (MI), Italy
K. Jensch, D. Kostin, L. Lilje, A. Matheisen, W.-D. Möller, P. Schilling, M. Schmökel, N.J. Walker, H. Weise
DESY, Hamburg, Germany

S1-Global collaborative project by joint efforts of INFN, DESY, FNAL, SLAC and KEK, finished successfully at KEK- STF on February in 2011, is a crucial project for ILC. For this project, 8 SRF cavities, 2 from DESY, 2 from FNAL and 4 from KEK, were installed into one cryomodule with the thermal shields and the cooling pipes of liquid helium and nitrogen, cooled down to 2K totally three times, and cold-tested by using the three different frequency tuning systems (Blade tuner from INFN/FNAL, Saclay tuner from DESY and Slide-Jack tuner from KEK) and two types of input couplers (TTF III from DESY and STF#2 from KEK). During the cold test with high power, cavity performance, LFD (Lorentz Force Detuning) compensation by Piezo actuator, simultaneous 7 SRF cavities operation, dynamic heating loss measurement including static loss and DRFS (Distributed RF Scheme) operation with LLRF (Low Level RF) feedback system, were established successfully. In this talk, the results of the S1-Global cryomodule test are reported, discussed and summarized.

Slides THIOA01 [11.254 MB]

Paper	Title	Page
TUPO030	Status of the 9-Cell Superconducting Cavity R&D for ILC at Hitachi	439
	T. Watanuki, T. Semba, M. Watanabe Hitachi Ltd., Ibaraki-ken, Japan H. Hayano, E. Kako, S. Noguchi, T. Saeki, T. Shishido, K. Watanabe, Y. Yamamoto KEK, Ibaraki, Japan
	Hitachi is developing 9-cell superconducting cavities for ILC project in collaboration with KEK. We focus on electron beam welding (EBW) and plastic forming techniques. In 2010, Hitachi’s first 9-cell cavity without HOM couplers was completed successfully. Surface treatments and performance test of the cavity were carried out at KEK and the accelerating gradient reached 35.2 MV/m. We have undertaken the next 9-cell cavity with HOM couplers since January 2011. We will report the fabrication procedure and test result of first cavity and the current status of the next cavity.

TUPO032	Updates on R&D of Nondestructive Inspection Systems for SRF Cavities	447
	Y. Iwashita, H. Tongu Kyoto ICR, Uji, Kyoto, Japan H. Hayano, T. Saeki, K. Watanabe KEK, Ibaraki, Japan
	We are developing high resolution eddy current scan and High density Tmap and X-map. The high resolution eddy current scan showed 100 μm diameter hole with 50μm depth that was drilled on a Nb plate. The surface mount print circuit technology is applied to the high density Tmap and X-map devices, which will be ready soon to test at a vertical test bench. In addition, radiography using Xrays and neutrons are also under study. The results and status will be presented.
	Poster TUPO032 [2.362 MB]

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.

THIOB08	Hot topics: Recipes for 9-cell cavity fabrication and preparation	687
	T. Saeki KEK, Ibaraki, Japan
	In the mass production of International Linear Collider (ILC), about 16,000 9-cell SRF cavities must be produced for the linac. The current recipe of 9-cell cavity production is not enough for the required cost reduction for ILC. Various ideas for the cost reduction of 9-cell cavity fabrication would be duscussed in this presentation. As the final surface treatment of 9-cell cavity, the Electro-Polishing (EP) is the best candidate to realize high yield rate for high-gradient performance. However, the laboratories in the world are still using different EP parameter-sets for various reasons. In this presentation, the comparison of EP parameters among laboratories would be done and how we can reach to the best parameter sets would be discussed.
	Slides THIOB08 [3.108 MB]

THIOA01	Test Results of the International S1-Global Cryomodule	615
	Y. Yamamoto, M. Akemoto, S. Fukuda, K. Hara, H. Hayano, N. Higashi, E. Kako, H. Katagiri, Y. Kojima, Y. Kondo, T. Matsumoto, H. Matsushita, S. Michizono, T. Miura, H. Nakai, H. Nakajima, K. Nakanishi, S. Noguchi, N. Ohuchi, T. Saeki, M. Satoh, T. Shidara, T. Shishido, T. Takenaka, A. Terashima, N. Toge, K. Tsuchiya, K. Watanabe, S. Yamaguchi, A. Yamamoto, K. Yokoya, M. Yoshida KEK, Ibaraki, Japan C. Adolphsen, C.D. Nantista SLAC, Menlo Park, California, USA T.T. Arkan, S. Barbanotti, M.A. Battistoni, H. Carter, M.S. Champion, A. Hocker, R.D. Kephart, J.S. Kerby, D.V. Mitchell, T.J. Peterson, Y.M. Pischalnikov, M.C. Ross, W. Schappert, B.E. Smith Fermilab, Batavia, USA A. Bosotti, C. Pagani, R. Paparella, P. Pierini INFN/LASA, Segrate (MI), Italy K. Jensch, D. Kostin, L. Lilje, A. Matheisen, W.-D. Möller, P. Schilling, M. Schmökel, N.J. Walker, H. Weise DESY, Hamburg, Germany
	S1-Global collaborative project by joint efforts of INFN, DESY, FNAL, SLAC and KEK, finished successfully at KEK- STF on February in 2011, is a crucial project for ILC. For this project, 8 SRF cavities, 2 from DESY, 2 from FNAL and 4 from KEK, were installed into one cryomodule with the thermal shields and the cooling pipes of liquid helium and nitrogen, cooled down to 2K totally three times, and cold-tested by using the three different frequency tuning systems (Blade tuner from INFN/FNAL, Saclay tuner from DESY and Slide-Jack tuner from KEK) and two types of input couplers (TTF III from DESY and STF#2 from KEK). During the cold test with high power, cavity performance, LFD (Lorentz Force Detuning) compensation by Piezo actuator, simultaneous 7 SRF cavities operation, dynamic heating loss measurement including static loss and DRFS (Distributed RF Scheme) operation with LLRF (Low Level RF) feedback system, were established successfully. In this talk, the results of the S1-Global cryomodule test are reported, discussed and summarized.
	Slides THIOA01 [11.254 MB]