IPAC2013 - List of Authors (Suzuki, H.)

Paper

Title

Page

Installation and Commissioning of the 1.1 MW Deuteron Prototype Linac for IFMIF

1090

J. Knaster
IFMIF/EVEDA, Rokkasho, Japan
P. Cara, A. Mosnier
Fusion for Energy, Garching, Germany
S. Chel
CEA/DSM/IRFU, France
J. Molla
CIEMAT, Madrid, Spain
H. Suzuki
Japan Atomic Energy Agency (JAEA), International Fusion Energy Research Center (IFERC), Rokkasho, Kamikita, Aomori, Japan

IFMIF, the International Fusion Materials Irradiation Facility, will learn the degradation of the mechanical properties of purpose designed reduced activation ferritic-martensitic steels under bombardment of 14 MeV neutrons at 10¹⁸ n/m²s flux reaching values of 150 displacements per atom in the steel lattice. The understanding of the impact of Deuterium-Tritium fusion neutrons in next decade is essential to design and construct a fusion power plant; the next step after ITER. The 14 MeV neutrons are stripped from a liquid Li screen flowing at 15 m/s impacted by 2 parallel 125 mA deuteron beam at 40 MeV. IFMIF project, in its engineering validation phase, will operate in Rokkasho a 125 mA deuteron LINAC at 9 MeV that will validate the concept of IFMIF accelerator, LIPAc. The ion source will inject 140 mA deuterons at 100 KeV in a normal-conducting RFQ that will deliver the bunched beam at 5MeV to be accelerated up to 9 MeV thanks to 8 half-wave superconducting resonators. The installation and commissioning of LIPAc in Rokkasho (Japan) is sequential and the first stage is starting now; the strategy to overcome potential difficulties is detailed.

Slides TUOAB101 [2.396 MB]

WEPFI022

Inner Diameter Change over the Years of MA Cores of RF-cavities at the J-PARC 3 GeV Synchrotron

2750

T. Shimada, M. Nomura, F. Tamura, M. Yamamoto
JAEA/J-PARC, Tokai-mura, Japan
K. Hara, K. Hasegawa, C. Ohmori, M. Toda, M. Yoshii
KEK, Tokai, Ibaraki, Japan
A. Schnase
GSI, Darmstadt, Germany
H. Suzuki
Japan Atomic Energy Agency (JAEA), International Fusion Energy Research Center (IFERC), Rokkasho, Kamikita, Aomori, Japan

The 11 RF cavities at the J-PARC 3 GeV synchrotron use 198 MA cores. Buckling occurred in some cores since the operation started in October 2007. We have measured the inner diameters of the cores as part of the investigation to determine the cause of buckling when the cavities were disassembled for maintenance. We obtained inner diameter change values of 36 cores over a longer than 2 years interval in the summer of 2012. We noticed deformations of the inner shapes of the cores related to the manufacturing process, and that inner diameter changes over this period were not detected in most of the cores without buckling. Furthermore, an effective core manufacturing process to avoid the buckling has been established. We are going to replace old type cores with new type cores in summer shutdown periods every year and will have finished the replacement work by the summer of 2013. We report the relation between inner shapes of the cores and the manufacturing process and inner shape changes over the years.

Paper	Title	Page
TUOAB101	Installation and Commissioning of the 1.1 MW Deuteron Prototype Linac for IFMIF	1090
	J. Knaster IFMIF/EVEDA, Rokkasho, Japan P. Cara, A. Mosnier Fusion for Energy, Garching, Germany S. Chel CEA/DSM/IRFU, France J. Molla CIEMAT, Madrid, Spain H. Suzuki Japan Atomic Energy Agency (JAEA), International Fusion Energy Research Center (IFERC), Rokkasho, Kamikita, Aomori, Japan
	IFMIF, the International Fusion Materials Irradiation Facility, will learn the degradation of the mechanical properties of purpose designed reduced activation ferritic-martensitic steels under bombardment of 14 MeV neutrons at 10¹⁸ n/m²s flux reaching values of 150 displacements per atom in the steel lattice. The understanding of the impact of Deuterium-Tritium fusion neutrons in next decade is essential to design and construct a fusion power plant; the next step after ITER. The 14 MeV neutrons are stripped from a liquid Li screen flowing at 15 m/s impacted by 2 parallel 125 mA deuteron beam at 40 MeV. IFMIF project, in its engineering validation phase, will operate in Rokkasho a 125 mA deuteron LINAC at 9 MeV that will validate the concept of IFMIF accelerator, LIPAc. The ion source will inject 140 mA deuterons at 100 KeV in a normal-conducting RFQ that will deliver the bunched beam at 5MeV to be accelerated up to 9 MeV thanks to 8 half-wave superconducting resonators. The installation and commissioning of LIPAc in Rokkasho (Japan) is sequential and the first stage is starting now; the strategy to overcome potential difficulties is detailed.
	Slides TUOAB101 [2.396 MB]

WEPFI022	Inner Diameter Change over the Years of MA Cores of RF-cavities at the J-PARC 3 GeV Synchrotron	2750
	T. Shimada, M. Nomura, F. Tamura, M. Yamamoto JAEA/J-PARC, Tokai-mura, Japan K. Hara, K. Hasegawa, C. Ohmori, M. Toda, M. Yoshii KEK, Tokai, Ibaraki, Japan A. Schnase GSI, Darmstadt, Germany H. Suzuki Japan Atomic Energy Agency (JAEA), International Fusion Energy Research Center (IFERC), Rokkasho, Kamikita, Aomori, Japan
	The 11 RF cavities at the J-PARC 3 GeV synchrotron use 198 MA cores. Buckling occurred in some cores since the operation started in October 2007. We have measured the inner diameters of the cores as part of the investigation to determine the cause of buckling when the cavities were disassembled for maintenance. We obtained inner diameter change values of 36 cores over a longer than 2 years interval in the summer of 2012. We noticed deformations of the inner shapes of the cores related to the manufacturing process, and that inner diameter changes over this period were not detected in most of the cores without buckling. Furthermore, an effective core manufacturing process to avoid the buckling has been established. We are going to replace old type cores with new type cores in summer shutdown periods every year and will have finished the replacement work by the summer of 2013. We report the relation between inner shapes of the cores and the manufacturing process and inner shape changes over the years.