SRF2015 - List of Authors (Neyret, J.)

Paper	Title	Page
TUPB100	CEA Experience and Effort to Limit Magnetic Flux Trapping in Superconducting Cavities	847
	J. Plouin, F. Leseigneur CEA/DSM/IRFU, France N. Bazin, P. Charon, G. Devanz, H. Dzitko, P. Hardy, J. Neyret, O. Piquet CEA/IRFU, Gif-sur-Yvette, France
	Protecting superconducting cavities from the surrounding static magnetic field is considered as a key point to reach very good cavity performances. This can be achieved by both limiting the causes of magnetic flux around the cavity in the cryomodule, and enclosing cavities and/or cryomodules into magnetic shields. We will present the effort made at CEA into this direction: shield design, shield material characterization, at room and cryogenic temperature, and search and attenuation of the magnetic background present in the cryomodule during the cavities superconducting transition. This last point will be especially studied for the IFMIF project where the cryomodule houses the focusing magnets. Aspects of the cold magnetic shields for ESS will also be discussed.
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TUPB107	Development of a Test Bench to Prepare the Assembly of the IFMIF LIPAC Cavity String	879
	N. Bazin, G. Devanz, P. Hardy, C. Servouin CEA/DSM/IRFU, France J.K. Chambrillon CERN, Geneva, Switzerland H. Dzitko, J. Neyret CEA/IRFU, Gif-sur-Yvette, France F. Toral CIEMAT, Madrid, Spain
	The IFMIF LIPAc cryomodule houses eight half-wave resonators and eight solenoids which will be assembled on a support frame in clean room. Due to the short lattice defined by beam dynamics constraints, there is not much room between two elements for the operators’ hands to connect them. In order to test, optimize and validate the clean room assembly procedures and the associated tools, a test bench, consisting of a frame, a little bigger than one eight of the final support has been manufactured. In order to start the tests before the delivery of the actual key components of the cryomodule, a dummy cavity, solenoid and coupler were manufactured and will be used to perform tests outside and inside the clean room to validate the assembly procedure and the tools. The mock-up will then be used to train the operators for the assembly of the whole string.
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THPB045	Progress in IFMIF Half Wave Resonators Manufacturing and Test Preparation	1191
	G. Devanz, N. Bazin, G. Disset, P. Hardy, O. Piquet, J. Plouin CEA/DSM/IRFU, France H. Dzitko, H. Jenhani, J. Neyret, N. Sellami CEA/IRFU, Gif-sur-Yvette, France
	The IFMIF accelerator aims to provide an accelerator-based D-Li neutron source to produce high intensity high energy neutron flux to test samples as possible candidate materials to a full lifetime of fusion energy reactors. The first phase of the project aims at validating the technical options for the construction of an accelerator prototype, called LIPAc (Linear IFMIF Prototype Accelerator). A cryomodule hosting 8 Half Wave Resonators (HWR) at 175 MHz will provide the acceleration from 5 to 9 MeV. We report on the progress of the HWR manufacturing. A pre-series cavity will be used to assess and optimize the tuning procedure of the HWR, as well as the processing steps and related tooling. A new horizontal test cryostat (SATHORI) is also being set up at Saclay in the existing SRF test area. The SATHORI is dedicated to the IFMIF HWR performance check, fully equipped with its power coupler and cold tuning system. A 30kW-RF power will be available for these tests.
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FRBA01	Technical and Logistical Challenges for IFMIF-LIPAC Cryomodule Construction	1453
	H. Dzitko, N. Bazin, A. Bruniquel, P. Charon, S. Chel, G. Devanz, G. Disset, P. Gastinel, P. Hardy, J. Neyret, J. Relland, B. Renard, N. Sellami, M.R. Vallcorba-Carbonell CEA/IRFU, Gif-sur-Yvette, France N. Berton, P. Contrepois, V.M. Hennion, H. Jenhani, O. Piquet CEA/DSM/IRFU, France D. Gex, G. Phillips F4E, Germany A. Kasughai Japan Atomic Energy Agency (JAEA), International Fusion Energy Research Center (IFERC), Rokkasho, Kamikita, Aomori, Japan J. Knaster IFMIF/EVEDA, Rokkasho, Japan D. Regidor, F. Toral CIEMAT, Madrid, Spain
	This paper provides an overview of the final design and fabrication status of the IFMIF cryomodule, including the design issues, and deals with the strategies implemented in order to mitigate the main technical and logistical risks identified. The seismic constraints as well as licensing requirements, transportation issue and assembly process are also addressed. The IFMIF cryomodule presented here will be part of the LIPAc project (Linear IFMIF Prototype Accelerator). It is a full scale prototype of one of the IFMIF accelerators, from the injector to the first cryomodule, aiming at validating the technical options for the future accelerator-based D-Li neutron source to produce high intensity high energy neutron flux for testing of candidate materials for use in fusion energy reactors. The cryomodule contains all the equipment to transport and accelerate a 125 mA deuteron beam from an input energy of 5 MeV up to 9 MeV. It consists of a horizontal cryostat of about 6 m long, 3 m high and 2 m wide, which includes 8 superconducting HWRs for beam acceleration working at 175 MHz and at 4.5 K, 8 power couplers to provide RF power to cavities, and 8 Solenoid Packages as focusing elements.
	Slides FRBA01 [9.263 MB]
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Paper

Title

Page

CEA Experience and Effort to Limit Magnetic Flux Trapping in Superconducting Cavities

847

J. Plouin, F. Leseigneur
CEA/DSM/IRFU, France
N. Bazin, P. Charon, G. Devanz, H. Dzitko, P. Hardy, J. Neyret, O. Piquet
CEA/IRFU, Gif-sur-Yvette, France

Protecting superconducting cavities from the surrounding static magnetic field is considered as a key point to reach very good cavity performances. This can be achieved by both limiting the causes of magnetic flux around the cavity in the cryomodule, and enclosing cavities and/or cryomodules into magnetic shields. We will present the effort made at CEA into this direction: shield design, shield material characterization, at room and cryogenic temperature, and search and attenuation of the magnetic background present in the cryomodule during the cavities superconducting transition. This last point will be especially studied for the IFMIF project where the cryomodule houses the focusing magnets. Aspects of the cold magnetic shields for ESS will also be discussed.

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reference for this paper to ※ BibTeX, ※ LaTeX, ※ Text, ※ RIS/RefMan, ※ EndNote (xml)

TUPB107

Development of a Test Bench to Prepare the Assembly of the IFMIF LIPAC Cavity String

879

N. Bazin, G. Devanz, P. Hardy, C. Servouin
CEA/DSM/IRFU, France
J.K. Chambrillon
CERN, Geneva, Switzerland
H. Dzitko, J. Neyret
CEA/IRFU, Gif-sur-Yvette, France
F. Toral
CIEMAT, Madrid, Spain

The IFMIF LIPAc cryomodule houses eight half-wave resonators and eight solenoids which will be assembled on a support frame in clean room. Due to the short lattice defined by beam dynamics constraints, there is not much room between two elements for the operators’ hands to connect them. In order to test, optimize and validate the clean room assembly procedures and the associated tools, a test bench, consisting of a frame, a little bigger than one eight of the final support has been manufactured. In order to start the tests before the delivery of the actual key components of the cryomodule, a dummy cavity, solenoid and coupler were manufactured and will be used to perform tests outside and inside the clean room to validate the assembly procedure and the tools. The mock-up will then be used to train the operators for the assembly of the whole string.

Export •

reference for this paper to ※ BibTeX, ※ LaTeX, ※ Text, ※ RIS/RefMan, ※ EndNote (xml)

THPB045

Progress in IFMIF Half Wave Resonators Manufacturing and Test Preparation

1191

G. Devanz, N. Bazin, G. Disset, P. Hardy, O. Piquet, J. Plouin
CEA/DSM/IRFU, France
H. Dzitko, H. Jenhani, J. Neyret, N. Sellami
CEA/IRFU, Gif-sur-Yvette, France

The IFMIF accelerator aims to provide an accelerator-based D-Li neutron source to produce high intensity high energy neutron flux to test samples as possible candidate materials to a full lifetime of fusion energy reactors. The first phase of the project aims at validating the technical options for the construction of an accelerator prototype, called LIPAc (Linear IFMIF Prototype Accelerator). A cryomodule hosting 8 Half Wave Resonators (HWR) at 175 MHz will provide the acceleration from 5 to 9 MeV. We report on the progress of the HWR manufacturing. A pre-series cavity will be used to assess and optimize the tuning procedure of the HWR, as well as the processing steps and related tooling. A new horizontal test cryostat (SATHORI) is also being set up at Saclay in the existing SRF test area. The SATHORI is dedicated to the IFMIF HWR performance check, fully equipped with its power coupler and cold tuning system. A 30kW-RF power will be available for these tests.

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reference for this paper to ※ BibTeX, ※ LaTeX, ※ Text, ※ RIS/RefMan, ※ EndNote (xml)

FRBA01

Technical and Logistical Challenges for IFMIF-LIPAC Cryomodule Construction

1453

H. Dzitko, N. Bazin, A. Bruniquel, P. Charon, S. Chel, G. Devanz, G. Disset, P. Gastinel, P. Hardy, J. Neyret, J. Relland, B. Renard, N. Sellami, M.R. Vallcorba-Carbonell
CEA/IRFU, Gif-sur-Yvette, France
N. Berton, P. Contrepois, V.M. Hennion, H. Jenhani, O. Piquet
CEA/DSM/IRFU, France
D. Gex, G. Phillips
F4E, Germany
A. Kasughai
Japan Atomic Energy Agency (JAEA), International Fusion Energy Research Center (IFERC), Rokkasho, Kamikita, Aomori, Japan
J. Knaster
IFMIF/EVEDA, Rokkasho, Japan
D. Regidor, F. Toral
CIEMAT, Madrid, Spain

This paper provides an overview of the final design and fabrication status of the IFMIF cryomodule, including the design issues, and deals with the strategies implemented in order to mitigate the main technical and logistical risks identified. The seismic constraints as well as licensing requirements, transportation issue and assembly process are also addressed. The IFMIF cryomodule presented here will be part of the LIPAc project (Linear IFMIF Prototype Accelerator). It is a full scale prototype of one of the IFMIF accelerators, from the injector to the first cryomodule, aiming at validating the technical options for the future accelerator-based D-Li neutron source to produce high intensity high energy neutron flux for testing of candidate materials for use in fusion energy reactors. The cryomodule contains all the equipment to transport and accelerate a 125 mA deuteron beam from an input energy of 5 MeV up to 9 MeV. It consists of a horizontal cryostat of about 6 m long, 3 m high and 2 m wide, which includes 8 superconducting HWRs for beam acceleration working at 175 MHz and at 4.5 K, 8 power couplers to provide RF power to cavities, and 8 Solenoid Packages as focusing elements.

Slides FRBA01 [9.263 MB]

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