IPAC2016 - List of Authors (Knaster, J.)

Paper	Title	Page
MOZB02	Challenges of the High Current Prototype Accelerator of IFMIF/EVEDA	52
	J. Knaster, Y. Okumura IFMIF/EVEDA, Rokkasho, Japan P. Cara Fusion for Energy, Garching, Germany A. Kasughai Japan Atomic Energy Agency (JAEA), International Fusion Energy Research Center (IFERC), Rokkasho, Kamikita, Aomori, Japan M. Sugimoto QST/Takasaki, Takasaki, Japan
	LIPAc, under installation in Rokkasho will produce a 125 mA CW deuteron beam at 9 MeV. The objective of IFMIF is to generate a neutron flux of 10¹⁸ m-2s⁻¹ at 14 MeV for fusion materials testing using 2 x 125 mA CW D⁺ beams at 40 MeV impacting on a liquid lithium jet of 15 m/s. An ECR deuteron injector at 140 mA and 100 keV will be the source for a 9.7m long 4-vane RFQ, which will be complemented by a 175 MHz SRF linac composed of 8 HWRs for producing 9 MeV D⁺ beam. For a beam transmission >90%, beam simulations demand a D⁺ beam emittance below <0.3π mm·mrad. The first attempt on such high current accelerator was in the US in the early 80s under FMIT project with a H²⁺ 100 mA CW 2 MeV beam. LEDA successfully conducted 100 mA CW H⁺ at 6.7 MeV at the RFQ output energy in the late 90s, but using superconducting HWRs accelerating cavities at 125 mA CW with low-β H⁺/D⁺ beam has never been attempted. Beam halo will be monitored with 3 cryogenic μ-loss monitors azimuthally placed in each of the 8 superconducting solenoids interleaved with the HWR structures. A novel approach based on a beam core-halo dual matching has been developed to handle the MW range beam average power.
	Slides MOZB02 [18.358 MB]
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MOPOY057	The Linear IFMIF Prototype Accelerator (LIPAC) Design Development under the European-Japanese Collaboration	985
	P. Cara, R. Heidinger Fusion for Energy, Garching, Germany N. Bazin, S. Chel, R. Gobin, J. Marroncle, B. Renard CEA/DSM/IRFU, France B. Brañas Lasala, D. Jiménez-Rey, J. Mollá, P. Méndez, I. Podadera CIEMAT, Madrid, Spain A. Facco, E. Fagotti, A. Pisent INFN/LNL, Legnaro (PD), Italy A. Kasugai, S. Keishi, S. O'hira JAEA, Aomori, Japan J. Knaster, A. Marqueta, Y. Okumura IFMIF/EVEDA, Rokkasho, Japan K. Sakamoto QST, Aomori, Japan
	The IFMIF aims to provide an accelerator-based, D-Li neutron source to produce high energy neutrons at sufficient intensity. Part of the BA agreement (Japan-EURATOM), the goal of the IFMIF/EVEDA project is to work on the engineering design of IFMIF and to validate the main technological challenges which includes a 125mA CW D⁺ accelerator up to 9 MeV mainly designed and manufactured in Europe. The components are in an advanced stage of manufacturing. The first components which allow the production of a 140 mA-100 keV deuteron beam have been delivered, installed and under commissioning at Rokkasho. The second phase (100 keV to 5 MeV) will end by March 2017. The third phase (short pulse) and forth phase (cw) will be the integrated commissioning of the LIPAc up to 9 MeV. The duration of the project has been recently extended up to end 2019 to allow the commissioning and operation of the whole accelerator (1MW). The aim of this paper is to give an overview of the LIPAc, currently under commissioning in Japan, to outline the engineering design and the development of the key components, as well as the expected outcomes of the engineering work, associated with the experimental program.
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WEPMR044	Beam Induced Damage Studies of the IFMIF/EVEDA 125 mA CW 9 MeV D⁺ Linear Accelerator	2373
	F. Scantamburlo, J. Knaster, A. Marqueta IFMIF/EVEDA, Rokkasho, Japan P.-Y. Beauvais F4E, Germany B. Bolzon, H. Dzitko CEA/IRFU, Gif-sur-Yvette, France R. Ichimiya JAEA, Aomori, Japan H. Kobayashi KEK, Ibaraki, Japan
	IFMIF (International Fusion Material Irradiation Facility) will be a Li(d, xn) neutron source providing equivalent neutron spectrum of DT fusion reactions and comparable neutron flux of future commercial reactors. IFMIF, presently in its EVEDA (Engineering Validation and Engineering Design Activities) phase is installing LIPAc (Linear IFMIF Prototype Accelerator) in Rokkasho (Japan), a 125 mA CW 9 MeV deuteron beam as validating prototype of IFMIF accelerators. The MPS of LIPAc manages the interlocks for a fast beam stop during anomalous beam losses or other hazardous situations. High speed processing is essential to achieve MPS goals driven by investment protection principles. Since Bragg's peak depth is dependent of energy, power densities by uncontrolled beam losses can be very damaging at low energies; the MPS principles for LIPAc are validating those for IFMIF. Beam losses may lead to severe damages by excessive thermal stresses, annealing or even burn/melting of materials. Careful studies to set the maximum allowable time for a beam shutdown to prevent undesired scenarios during the accelerator operational life have been undertaken.
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WEPMY033	Intermediate Commissioning Results of the 70 mA/50 keV H⁺ and 140 mA/100 keV D⁺ ECR Injector of IFMIF/LIPAC	2625
	B. Bolzon, N. Chauvin, S. Chel, R. Gobin, F. Harrault, F. Senée, M. Valette CEA/DSM/IRFU, France J.M. Ayala, J. Knaster, A. Marqueta, K. Nishiyama, Y. Okumura, M. Perez, G. Pruneri, F. Scantamburlo IFMIF/EVEDA, Rokkasho, Japan P.-Y. Beauvais, H. Dzitko, D. Gex, G. Phillips F4E, Germany L. Bellan Univ. degli Studi di Padova, Padova, Italy L. Bellan, M. Comunian, E. Fagotti, F. Grespan, A. Pisent INFN/LNL, Legnaro (PD), Italy P. Cara, R. Heidinger Fusion for Energy, Garching, Germany R. Ichimiya, A. Ihara, Y. Ikeda, A. Kasugai, T. Kikuchi, T. Kitano, M. Komata, K. Kondo, S. Maebara, S. O'hira, M. Sugimoto, H. Takahashi, H. Usami JAEA, Aomori, Japan K. Sakamoto QST, Aomori, Japan K. Shinto Japan Atomic Energy Agency (JAEA), International Fusion Energy Research Center (IFERC), Rokkasho, Kamikita, Aomori, Japan
	The LIPAc accelerator aims to operate 125 mA/CW deuteron beam at 9 MeV to validate IFMIF's accelerators that will operate in CW 125 mA at 40 MeV. The different subsystems of LIPAc have been designed and constructed mainly by European labs and are being installed and commissioned in Rokkasho Fusion Center. The 2.45 GHz ECR injector developed by CEA-Saclay is designed to deliver 140 mA/100 keV CW D⁺ beam with 99% gas fraction ratio. Its LEBT presents a dual solenoid focusing system to transport and match the beam into the RFQ. Its commissioning continues in 2016 in parallel with the RFQ installation. The normalized RMS emittance at the RFQ injection cone is to be within 0.25π mm·mrad to allow 96% transmission through the 9.81 m long RFQ. In order to avoid activation during commissioning, an equal perveance H⁺ beam of half current and half energy as nominal with deuterons is used. In this article, the commissioning results with 110 mA/100 keV D⁺ beam and 55 mA/50 keV H⁺ beam are first reported.
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THPOY035	Machine Protection and Safe Operation of LIPAc Linear Accelerator	4178
	A. Marqueta, J. Knaster, K. Nishiyama IFMIF/EVEDA, Rokkasho, Japan P.-Y. Beauvais, H. Dzitko F4E, Germany P. Cara Fusion for Energy, Garching, Germany H. Kobayashi KEK, Ibaraki, Japan I. Podadera CIEMAT, Madrid, Spain
	A Li(d, xn) fusion relevant neutron source with a broad peak at 14 MeV is indispensable to characterize and qualify suitable structural materials for the plasma facing components in future fusion reactors. LIPAc (Linear IFMIF Prototype Accelerator), presently under its installation and commissioning phase in Rokkasho, will validate the concept of a 40 MeV deuteron accelerator with its 125 mA CW and 9 MeV deuteron beam for a total beam average power of 1.125 MW. The Machine Protection System (MPS) of LIPAc provides the essential interlock function of stopping the beam in case of excessive beam loss or other hazardous situations. However, approaching LIPAc beam commissioning Phase B (including RFQ powered by total 1.6 MW RF power) a risk analysis has been performed on all major technical systems to identify the sources of risk, apply the necessary countermeasures and enhance accelerator availability, avoiding unnecessary beam stop triggers and allowing a fast beam recovery whenever possible. The overall strategy for the machine protection at LIPAc is presented in this paper.
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Paper

Title

Page

Challenges of the High Current Prototype Accelerator of IFMIF/EVEDA

52

J. Knaster, Y. Okumura
IFMIF/EVEDA, Rokkasho, Japan
P. Cara
Fusion for Energy, Garching, Germany
A. Kasughai
Japan Atomic Energy Agency (JAEA), International Fusion Energy Research Center (IFERC), Rokkasho, Kamikita, Aomori, Japan
M. Sugimoto
QST/Takasaki, Takasaki, Japan

LIPAc, under installation in Rokkasho will produce a 125 mA CW deuteron beam at 9 MeV. The objective of IFMIF is to generate a neutron flux of 10¹⁸ m-2s⁻¹ at 14 MeV for fusion materials testing using 2 x 125 mA CW D⁺ beams at 40 MeV impacting on a liquid lithium jet of 15 m/s. An ECR deuteron injector at 140 mA and 100 keV will be the source for a 9.7m long 4-vane RFQ, which will be complemented by a 175 MHz SRF linac composed of 8 HWRs for producing 9 MeV D⁺ beam. For a beam transmission >90%, beam simulations demand a D⁺ beam emittance below <0.3π mm·mrad. The first attempt on such high current accelerator was in the US in the early 80s under FMIT project with a H²⁺ 100 mA CW 2 MeV beam. LEDA successfully conducted 100 mA CW H⁺ at 6.7 MeV at the RFQ output energy in the late 90s, but using superconducting HWRs accelerating cavities at 125 mA CW with low-β H⁺/D⁺ beam has never been attempted. Beam halo will be monitored with 3 cryogenic μ-loss monitors azimuthally placed in each of the 8 superconducting solenoids interleaved with the HWR structures. A novel approach based on a beam core-halo dual matching has been developed to handle the MW range beam average power.

Slides MOZB02 [18.358 MB]

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

MOPOY057

The Linear IFMIF Prototype Accelerator (LIPAC) Design Development under the European-Japanese Collaboration

985

P. Cara, R. Heidinger
Fusion for Energy, Garching, Germany
N. Bazin, S. Chel, R. Gobin, J. Marroncle, B. Renard
CEA/DSM/IRFU, France
B. Brañas Lasala, D. Jiménez-Rey, J. Mollá, P. Méndez, I. Podadera
CIEMAT, Madrid, Spain
A. Facco, E. Fagotti, A. Pisent
INFN/LNL, Legnaro (PD), Italy
A. Kasugai, S. Keishi, S. O'hira
JAEA, Aomori, Japan
J. Knaster, A. Marqueta, Y. Okumura
IFMIF/EVEDA, Rokkasho, Japan
K. Sakamoto
QST, Aomori, Japan

The IFMIF aims to provide an accelerator-based, D-Li neutron source to produce high energy neutrons at sufficient intensity. Part of the BA agreement (Japan-EURATOM), the goal of the IFMIF/EVEDA project is to work on the engineering design of IFMIF and to validate the main technological challenges which includes a 125mA CW D⁺ accelerator up to 9 MeV mainly designed and manufactured in Europe. The components are in an advanced stage of manufacturing. The first components which allow the production of a 140 mA-100 keV deuteron beam have been delivered, installed and under commissioning at Rokkasho. The second phase (100 keV to 5 MeV) will end by March 2017. The third phase (short pulse) and forth phase (cw) will be the integrated commissioning of the LIPAc up to 9 MeV. The duration of the project has been recently extended up to end 2019 to allow the commissioning and operation of the whole accelerator (1MW). The aim of this paper is to give an overview of the LIPAc, currently under commissioning in Japan, to outline the engineering design and the development of the key components, as well as the expected outcomes of the engineering work, associated with the experimental program.

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WEPMR044

Beam Induced Damage Studies of the IFMIF/EVEDA 125 mA CW 9 MeV D⁺ Linear Accelerator

2373

F. Scantamburlo, J. Knaster, A. Marqueta
IFMIF/EVEDA, Rokkasho, Japan
P.-Y. Beauvais
F4E, Germany
B. Bolzon, H. Dzitko
CEA/IRFU, Gif-sur-Yvette, France
R. Ichimiya
JAEA, Aomori, Japan
H. Kobayashi
KEK, Ibaraki, Japan

IFMIF (International Fusion Material Irradiation Facility) will be a Li(d, xn) neutron source providing equivalent neutron spectrum of DT fusion reactions and comparable neutron flux of future commercial reactors. IFMIF, presently in its EVEDA (Engineering Validation and Engineering Design Activities) phase is installing LIPAc (Linear IFMIF Prototype Accelerator) in Rokkasho (Japan), a 125 mA CW 9 MeV deuteron beam as validating prototype of IFMIF accelerators. The MPS of LIPAc manages the interlocks for a fast beam stop during anomalous beam losses or other hazardous situations. High speed processing is essential to achieve MPS goals driven by investment protection principles. Since Bragg's peak depth is dependent of energy, power densities by uncontrolled beam losses can be very damaging at low energies; the MPS principles for LIPAc are validating those for IFMIF. Beam losses may lead to severe damages by excessive thermal stresses, annealing or even burn/melting of materials. Careful studies to set the maximum allowable time for a beam shutdown to prevent undesired scenarios during the accelerator operational life have been undertaken.

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WEPMY033

Intermediate Commissioning Results of the 70 mA/50 keV H⁺ and 140 mA/100 keV D⁺ ECR Injector of IFMIF/LIPAC

2625

B. Bolzon, N. Chauvin, S. Chel, R. Gobin, F. Harrault, F. Senée, M. Valette
CEA/DSM/IRFU, France
J.M. Ayala, J. Knaster, A. Marqueta, K. Nishiyama, Y. Okumura, M. Perez, G. Pruneri, F. Scantamburlo
IFMIF/EVEDA, Rokkasho, Japan
P.-Y. Beauvais, H. Dzitko, D. Gex, G. Phillips
F4E, Germany
L. Bellan
Univ. degli Studi di Padova, Padova, Italy
L. Bellan, M. Comunian, E. Fagotti, F. Grespan, A. Pisent
INFN/LNL, Legnaro (PD), Italy
P. Cara, R. Heidinger
Fusion for Energy, Garching, Germany
R. Ichimiya, A. Ihara, Y. Ikeda, A. Kasugai, T. Kikuchi, T. Kitano, M. Komata, K. Kondo, S. Maebara, S. O'hira, M. Sugimoto, H. Takahashi, H. Usami
JAEA, Aomori, Japan
K. Sakamoto
QST, Aomori, Japan
K. Shinto
Japan Atomic Energy Agency (JAEA), International Fusion Energy Research Center (IFERC), Rokkasho, Kamikita, Aomori, Japan

The LIPAc accelerator aims to operate 125 mA/CW deuteron beam at 9 MeV to validate IFMIF's accelerators that will operate in CW 125 mA at 40 MeV. The different subsystems of LIPAc have been designed and constructed mainly by European labs and are being installed and commissioned in Rokkasho Fusion Center. The 2.45 GHz ECR injector developed by CEA-Saclay is designed to deliver 140 mA/100 keV CW D⁺ beam with 99% gas fraction ratio. Its LEBT presents a dual solenoid focusing system to transport and match the beam into the RFQ. Its commissioning continues in 2016 in parallel with the RFQ installation. The normalized RMS emittance at the RFQ injection cone is to be within 0.25π mm·mrad to allow 96% transmission through the 9.81 m long RFQ. In order to avoid activation during commissioning, an equal perveance H⁺ beam of half current and half energy as nominal with deuterons is used. In this article, the commissioning results with 110 mA/100 keV D⁺ beam and 55 mA/50 keV H⁺ beam are first reported.

Export •

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THPOY035

Machine Protection and Safe Operation of LIPAc Linear Accelerator

4178

A. Marqueta, J. Knaster, K. Nishiyama
IFMIF/EVEDA, Rokkasho, Japan
P.-Y. Beauvais, H. Dzitko
F4E, Germany
P. Cara
Fusion for Energy, Garching, Germany
H. Kobayashi
KEK, Ibaraki, Japan
I. Podadera
CIEMAT, Madrid, Spain

A Li(d, xn) fusion relevant neutron source with a broad peak at 14 MeV is indispensable to characterize and qualify suitable structural materials for the plasma facing components in future fusion reactors. LIPAc (Linear IFMIF Prototype Accelerator), presently under its installation and commissioning phase in Rokkasho, will validate the concept of a 40 MeV deuteron accelerator with its 125 mA CW and 9 MeV deuteron beam for a total beam average power of 1.125 MW. The Machine Protection System (MPS) of LIPAc provides the essential interlock function of stopping the beam in case of excessive beam loss or other hazardous situations. However, approaching LIPAc beam commissioning Phase B (including RFQ powered by total 1.6 MW RF power) a risk analysis has been performed on all major technical systems to identify the sources of risk, apply the necessary countermeasures and enhance accelerator availability, avoiding unnecessary beam stop triggers and allowing a fast beam recovery whenever possible. The overall strategy for the machine protection at LIPAc is presented in this paper.

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