LINAC2012 - List of Keywords (neutron)

Paper	Title	Other Keywords	Page
MO1A01	Operational Experience and Future Goals of the SARAF Linac at SOREQ	proton, target, linac, cavity	100
	D. Berkovits, A. Arenshtam, Y. Ben Aliz, Y. Buzaglo, O. Dudovich, Y. Eisen, I. Eliyahu, G. Feinberg, I. Fishman, I. Gavish, I.G. Gertz, A. Grin, S. Halfon, D. Har-Even, Y.F. Haruvy, T. Hirsch, D. Hirschmann, Z. Horvitz, B. Kaizer, D. Kijel, A. Kreisel, G. Lempert, J. Luner, I. Mardor, A. Perry, E. Reinfeld, J. Rodnizki, G. Shimel, A. Shor, I. Silverman, L. Weissman, E. Zemach Soreq NRC, Yavne, Israel
	SARAF-phase 1 at SOREQ, with its single 6 half-wave resonators cryomodule, is the first high current, superconducting low-beta linac in operation and it is presently delivering cw proton beams in the mA range. A phase 2 is foreseen for this linac which will allow acceleration up to 40 MeV of 2 mA cw proton and deuteron beams. The project status, the operational experience and the future goals of SARAF should be described.
	Slides MO1A01 [3.276 MB]

MO3A03	FRANZ – Accelerator Test Bench and Neutron Source	proton, rfq, ion, space-charge	130
	O. Meusel, L.P. Chau, M. Heilmann, H. Podlech, U. Ratzinger, K. Volk, C. Wiesner IAP, Frankfurt am Main, Germany
	The challenge of existing and planned neutron sources is to provide highly brilliant ion beams with high reliability. The Frankfurt neutron source FRANZ is not only a neutron source but also a test bench for novel accelerator and diagnostic concepts for intense ion beams. The experiment consists of a compact linear accelerator test bench for the acceleration of an intense proton beam to 2 MeV producing the neutrons via the ⁷Li(p,n) reaction. The final beam intensity will be 200 mA, therefore the space charge and space charge compensation effects can be studied with high statistical relevance along the accelerator. The low energy beam transport LEBT is equipped with four solenoids matching the beam into the chopper system and into the RFQ-IH combination already under construction. The coupling of the RFQ accelerator stage and the IH drift tube cavity offers the possibility to use only one power amplifier as a driver for both of these resonators and reduces investment costs. The compact design of this low-β accelerator stage is optimized for high beam intensities to overcome the strong space charge forces expected in this accelerator test bench.

MO3A04	Accelerator/Decelerator of Slow Neutrons	focusing, simulation, controls, dipole	133
	M. Kitaguchi Kyoto University, Research Reactor Institute, Osaka, Japan Y. Arimoto, H.M. Shimizu KEK, Ibaraki, Japan P.W. Geltenbort ILL, Grenoble, France S. Imajo Kyoto University, Kyoto, Japan Y. Iwashita Kyoto ICR, Uji, Kyoto, Japan Y. Seki RIKEN Nishina Center, Wako, Japan T. Yoshioka Kyushu University, Fukuoka, Japan
	Funding: Supported by the Quantum Beam Fundamentals Development Program MEXT, a Grant-in-Aid for Creative Scientific Research of MEXT Program No.19GS0210 and No.23244047, Yamada Science Foundation, and KEK. An accelerator/decelerator for slow neutron beams has been demonstrated. The energy of a neutron can be increased or decreased by flipping the neutron spin (directly coupled to magnetic dipole moment) in magnetic field. This device is a combination of a gradient magnetic field and an RF magnetic field. Because the RF frequency for the spin flip is a function of the external magnetic field, only neutrons that are located in a specific magnetic field level will be spin-flipped at a given RF frequency. By changing the RF frequency, the energy change can be selected in the gradient magnetic field. The maximum field of the gradient magnet is 1 T, which corresponds to the energy change of 120 neV. The magnetic field linearly decreases to 0.2T within 25 cm. By putting this device on a beamline from a pulsed neutron source, neutron rebuncher is realized. The dense slow neutrons are important to suppress the systematic errors for the measurement of neutron electric dipole moment (nEDM). The combination of spallation neutron source and this neutron rebuncher is suitable to the measurement of nEDM. A review of current status of our plan for nEDM experiment at J-PARC will be also presented.
	Slides MO3A04 [3.750 MB]

MOPB023	Progress on the Design and Construction of the 100 MeV / 100 kW Electron Linac for the NSC KIPT Neutron Source	linac, klystron, electron, gun	222
	S. Pei, J. Cao, Y.L. Chi, B. Deng, C.D. Deng, H.S. Guo, D.Y. He, X. He, M. Hou, X.C. Kong, Q. Le, X. Li, J. Liu, R.L. Liu, W.B. Liu, K. Lv, C. Ma, H.Z. Ma, G. Pei, H. Song, L. Wang, S.H. Wang, X. Wang, Q. Yang, J. Yue, J.R. Zhang, F. Zhao, J.B. Zhao, J.X. Zhao, Z.S. Zhou IHEP, Beijing, People's Republic of China M.I. Ayzatskiy, I.M. Karnaukhov, V.A. Kushnir, V.V. Mytrochenko, A.Y. Zelinsky NSC/KIPT, Kharkov, Ukraine Y. Gohar ANL, Argonne, USA
	IHEP in China is designing and constructing a 100 MeV / 100 kW electron linac for NSC KIPT, which will be used as the driver of a neutron source based on a subcritical assembly. Recently, the physical design has been finalized. The chicane scheme instead of the RF chopper one has been selected. The mechanical design is on-going and will be finished in the very near future. The injector part of the machine has been installed in the experimental hall #2 of IHEP and is being commissioned and tested. The progress on the machine design and construction are reported, initial testing and commissioning results of the injector are also presented. *peisl@ihep.ac.cn

TU1A03	Chinese ADS Project and Proton Accelerator Development	proton, rfq, linac, target	412
	Y.L. Chi, S. Fu, W.M. Pan, P. Sha IHEP, Beijing, People's Republic of China Q.Z. Xing TUB, Beijing, People's Republic of China
	Interest in the feasibility of ADS has increased dramatically in the last decade. This talk will briefly introduce the technologies presently available for ADS applications and provide a review of the ongoing R&D and construction activities in China, with particular emphasis on the challenges presented by the development of a high intensity, SRF CW proton Linac.
	Slides TU1A03 [3.803 MB]

TUPB077	Thorium Energy	target, proton, cyclotron, linac	651
	S. Peggs BNL, Upton, Long Island, New York, USA R. Cywinski, R. Seviour University of Huddersfield, Huddersfield, United Kingdom S. Peggs ESS, Lund, Sweden
	The potential for using thorium as an alternative or supplement for uranium in fission power generation has long been recognised, with growing concerns over nuclear waste, safety and proliferation. Thorium may be used in solid fuel form, or in molten salt systems. In some approaches the fuel can incorporate components from spent nuclear fuel (minor actinides, plutonium) to also serve a transmutation function. We consider the benefits and drawbacks of using an accelerator driven subcritical system, for both solid fuel and molten salt cases, in particular addressing the power and reliability requirements of the accelerator. We outline the research that will be necessary to lead to an informed choice.

TUPB082	Beam Loss Track Measurements by a Fast Trigger Scheme in J-PARC Linac	linac, background, proton, simulation	663
	H. Sako, T. Maruta, A. Miura JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken, Japan
	Funding: Work partially supported by Grant-in-Aid for Challenging Exploratory Research In J-PARC Linac, highest beam loss has been observed at the ACS (Annular-Coupled Structure linac) section. The primary source of the beam loss is considered to be H⁰ produced by an interaction of H⁻ beams with remnant gas. The H⁰ hits the beam duct, converted to H⁺, and escapes from the beam duct. To detect the H⁺'s and estimate the absolute magnitude of the beam loss, we constructed a detector system, which consists of 6 planes of hodoscopes made of 16 scintillation fibers with 64 x 64 mm² area. The scintillation light is measured by multi-anode photomultipliers. In the ACS section, two planes to measure horizontal positions are installed, and at about 1 m downstream positions, two planes for horizontal measurements and two for vertical measurements are placed. We will reconstruct charged particles passing through all the 6 planes, and measure the velocity by time-of-flight and energy loss to identify particle species. We present new measurements since the recovery of the J-PARC after the earthquake started in April 2012 by a new fast trigger scheme using dynode signals of photomultipliers in order to improve signal-to-noise ratios.

TUPB084	High Dynamic-Range High Speed Linac Current Measurements	linac, monitoring, injection, feedback	666
	C. Deibele ORNL, Oak Ridge, Tennessee, USA D. Curry, R. Dickson ORNL RAD, Oak Ridge, Tennessee, USA
	Funding: ORNL is managed by UT-Battelle, LLC, under contract DE-AC05-00OR22725 for the U.S. Department of Energy. It is desired to measure the linac current of a charged particle beam with a consistent accuracy over a dynamic range of over 120 dB. Conventional current transformers suffer from droop, can be susceptible to electromagnetic interference (EMI), and can be bandwidth limited. A novel detector and electronics were designed to maximize dynamic range of about 120 dB and measure risetimes on the order of 10 nanoseconds.

THPLB01	Linac Construction for China Spallation Neutron Source	linac, DTL, rfq, cavity	807
	S. Fu, J. Li, H.C. Liu, H.F. Ouyang, X. Yin IHEP, Beijing, People's Republic of China
	Construction of China Spallation Neutron Source(CSNS) has been launched in September 2011. CSNS accelerator will provide 100kW proton beam on a target at beam energy of 1.6GeV. It consists of an 80MeV H⁻ linac and 1.6GeV rapid cycling synchrotron. Based on the prototyping experience, CSNS linac, including the front end and four DTL tanks, has finalized the design and started procurement. In this paper, we will first present an outline of the CSNS accelerator in its design and construction plan. Then the major prototyping results of the linac will be presented. Finally the linac construction progress in recent will be updated.
	Slides THPLB01 [1.969 MB]

THPB023	Linac Construction for China Spallation Neutron Source	linac, DTL, rfq, cavity	897
	S. Fu, J. Li, H.C. Liu, H.F. Ouyang, X. Yin IHEP, Beijing, People's Republic of China
	Construction of China Spallation Neutron Source(CSNS) has been launched in September 2011. CSNS accelerator will provide 100kW proton beam on a target at beam energy of 1.6GeV. It consists of an 80MeV H⁻ linac and 1.6GeV rapid cycling synchrotron. Based on the prototyping experience, CSNS linac, including the front end and four DTL tanks, has finalized the design and started procurement. In this paper, we will first present an outline of the CSNS accelerator in its design and construction plan. Then the major prototyping results of the linac will be presented. Finally the linac construction progress in recent will be updated.

THPB039	Design of a Four-Vane RFQ for China ADS Project	rfq, cavity, emittance, proton	942
	Z.L. Zhang, X. Du, Y. He, X. Jin, C. Li, Y. Liu, A. Shi, L.P. Sun, B. Zhang, H.W. Zhao IMP, Lanzhou, People's Republic of China M.D. Hoff, A.R. Lambert, D. Li, J.W. Staples, S.P. Virostek LBNL, Berkeley, California, USA J. Wang Lanzhou University of Technology, People's Republic of China C. Zhang IAP, Frankfurt am Main, Germany
	A four-vane RFQ accelerator has been designed for the ADS project which has been launched in China since 2011. As one of the front ends of C-ADS LINAC, the RFQ works at a frequency of 162.5 MHz, accelerating the proton beam from 35 keV to 2.1 MeV. Due to the CW (continuous wave) operating mode, a small Kilpatric factor of 1.2 was adopted. At the same time, Pi-mode rods are employed to reduce the effect of dipole mode on quadrupole mode, and cavity tuning will be implemented by temperature adjustment of cooling water. Beam dynamics design, RF cavity design, thermal and stress analysis all will be presented in the paper.

Paper

Title

Other Keywords

Page

MO1A01

Operational Experience and Future Goals of the SARAF Linac at SOREQ

proton, target, linac, cavity

100

D. Berkovits, A. Arenshtam, Y. Ben Aliz, Y. Buzaglo, O. Dudovich, Y. Eisen, I. Eliyahu, G. Feinberg, I. Fishman, I. Gavish, I.G. Gertz, A. Grin, S. Halfon, D. Har-Even, Y.F. Haruvy, T. Hirsch, D. Hirschmann, Z. Horvitz, B. Kaizer, D. Kijel, A. Kreisel, G. Lempert, J. Luner, I. Mardor, A. Perry, E. Reinfeld, J. Rodnizki, G. Shimel, A. Shor, I. Silverman, L. Weissman, E. Zemach
Soreq NRC, Yavne, Israel

SARAF-phase 1 at SOREQ, with its single 6 half-wave resonators cryomodule, is the first high current, superconducting low-beta linac in operation and it is presently delivering cw proton beams in the mA range. A phase 2 is foreseen for this linac which will allow acceleration up to 40 MeV of 2 mA cw proton and deuteron beams. The project status, the operational experience and the future goals of SARAF should be described.

Slides MO1A01 [3.276 MB]

MO3A03

FRANZ – Accelerator Test Bench and Neutron Source

proton, rfq, ion, space-charge

130

O. Meusel, L.P. Chau, M. Heilmann, H. Podlech, U. Ratzinger, K. Volk, C. Wiesner
IAP, Frankfurt am Main, Germany

The challenge of existing and planned neutron sources is to provide highly brilliant ion beams with high reliability. The Frankfurt neutron source FRANZ is not only a neutron source but also a test bench for novel accelerator and diagnostic concepts for intense ion beams. The experiment consists of a compact linear accelerator test bench for the acceleration of an intense proton beam to 2 MeV producing the neutrons via the ⁷Li(p,n) reaction. The final beam intensity will be 200 mA, therefore the space charge and space charge compensation effects can be studied with high statistical relevance along the accelerator. The low energy beam transport LEBT is equipped with four solenoids matching the beam into the chopper system and into the RFQ-IH combination already under construction. The coupling of the RFQ accelerator stage and the IH drift tube cavity offers the possibility to use only one power amplifier as a driver for both of these resonators and reduces investment costs. The compact design of this low-β accelerator stage is optimized for high beam intensities to overcome the strong space charge forces expected in this accelerator test bench.

MO3A04

Accelerator/Decelerator of Slow Neutrons

focusing, simulation, controls, dipole

133

M. Kitaguchi
Kyoto University, Research Reactor Institute, Osaka, Japan
Y. Arimoto, H.M. Shimizu
KEK, Ibaraki, Japan
P.W. Geltenbort
ILL, Grenoble, France
S. Imajo
Kyoto University, Kyoto, Japan
Y. Iwashita
Kyoto ICR, Uji, Kyoto, Japan
Y. Seki
RIKEN Nishina Center, Wako, Japan
T. Yoshioka
Kyushu University, Fukuoka, Japan

Funding: Supported by the Quantum Beam Fundamentals Development Program MEXT, a Grant-in-Aid for Creative Scientific Research of MEXT Program No.19GS0210 and No.23244047, Yamada Science Foundation, and KEK.
An accelerator/decelerator for slow neutron beams has been demonstrated. The energy of a neutron can be increased or decreased by flipping the neutron spin (directly coupled to magnetic dipole moment) in magnetic field. This device is a combination of a gradient magnetic field and an RF magnetic field. Because the RF frequency for the spin flip is a function of the external magnetic field, only neutrons that are located in a specific magnetic field level will be spin-flipped at a given RF frequency. By changing the RF frequency, the energy change can be selected in the gradient magnetic field. The maximum field of the gradient magnet is 1 T, which corresponds to the energy change of 120 neV. The magnetic field linearly decreases to 0.2T within 25 cm. By putting this device on a beamline from a pulsed neutron source, neutron rebuncher is realized. The dense slow neutrons are important to suppress the systematic errors for the measurement of neutron electric dipole moment (nEDM). The combination of spallation neutron source and this neutron rebuncher is suitable to the measurement of nEDM. A review of current status of our plan for nEDM experiment at J-PARC will be also presented.

Slides MO3A04 [3.750 MB]

MOPB023

Progress on the Design and Construction of the 100 MeV / 100 kW Electron Linac for the NSC KIPT Neutron Source

linac, klystron, electron, gun

222

S. Pei, J. Cao, Y.L. Chi, B. Deng, C.D. Deng, H.S. Guo, D.Y. He, X. He, M. Hou, X.C. Kong, Q. Le, X. Li, J. Liu, R.L. Liu, W.B. Liu, K. Lv, C. Ma, H.Z. Ma, G. Pei, H. Song, L. Wang, S.H. Wang, X. Wang, Q. Yang, J. Yue, J.R. Zhang, F. Zhao, J.B. Zhao, J.X. Zhao, Z.S. Zhou
IHEP, Beijing, People's Republic of China
M.I. Ayzatskiy, I.M. Karnaukhov, V.A. Kushnir, V.V. Mytrochenko, A.Y. Zelinsky
NSC/KIPT, Kharkov, Ukraine
Y. Gohar
ANL, Argonne, USA

IHEP in China is designing and constructing a 100 MeV / 100 kW electron linac for NSC KIPT, which will be used as the driver of a neutron source based on a subcritical assembly. Recently, the physical design has been finalized. The chicane scheme instead of the RF chopper one has been selected. The mechanical design is on-going and will be finished in the very near future. The injector part of the machine has been installed in the experimental hall #2 of IHEP and is being commissioned and tested. The progress on the machine design and construction are reported, initial testing and commissioning results of the injector are also presented.
*peisl@ihep.ac.cn

TU1A03

Chinese ADS Project and Proton Accelerator Development

proton, rfq, linac, target

412

Y.L. Chi, S. Fu, W.M. Pan, P. Sha
IHEP, Beijing, People's Republic of China
Q.Z. Xing
TUB, Beijing, People's Republic of China

Interest in the feasibility of ADS has increased dramatically in the last decade. This talk will briefly introduce the technologies presently available for ADS applications and provide a review of the ongoing R&D and construction activities in China, with particular emphasis on the challenges presented by the development of a high intensity, SRF CW proton Linac.

Slides TU1A03 [3.803 MB]

TUPB077

Thorium Energy

target, proton, cyclotron, linac

651

S. Peggs
BNL, Upton, Long Island, New York, USA
R. Cywinski, R. Seviour
University of Huddersfield, Huddersfield, United Kingdom
S. Peggs
ESS, Lund, Sweden

The potential for using thorium as an alternative or supplement for uranium in fission power generation has long been recognised, with growing concerns over nuclear waste, safety and proliferation. Thorium may be used in solid fuel form, or in molten salt systems. In some approaches the fuel can incorporate components from spent nuclear fuel (minor actinides, plutonium) to also serve a transmutation function. We consider the benefits and drawbacks of using an accelerator driven subcritical system, for both solid fuel and molten salt cases, in particular addressing the power and reliability requirements of the accelerator. We outline the research that will be necessary to lead to an informed choice.

TUPB082

Beam Loss Track Measurements by a Fast Trigger Scheme in J-PARC Linac

linac, background, proton, simulation

663

H. Sako, T. Maruta, A. Miura
JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken, Japan

Funding: Work partially supported by Grant-in-Aid for Challenging Exploratory Research
In J-PARC Linac, highest beam loss has been observed at the ACS (Annular-Coupled Structure linac) section. The primary source of the beam loss is considered to be H⁰ produced by an interaction of H⁻ beams with remnant gas. The H⁰ hits the beam duct, converted to H⁺, and escapes from the beam duct. To detect the H⁺'s and estimate the absolute magnitude of the beam loss, we constructed a detector system, which consists of 6 planes of hodoscopes made of 16 scintillation fibers with 64 x 64 mm² area. The scintillation light is measured by multi-anode photomultipliers. In the ACS section, two planes to measure horizontal positions are installed, and at about 1 m downstream positions, two planes for horizontal measurements and two for vertical measurements are placed. We will reconstruct charged particles passing through all the 6 planes, and measure the velocity by time-of-flight and energy loss to identify particle species. We present new measurements since the recovery of the J-PARC after the earthquake started in April 2012 by a new fast trigger scheme using dynode signals of photomultipliers in order to improve signal-to-noise ratios.

TUPB084

High Dynamic-Range High Speed Linac Current Measurements

linac, monitoring, injection, feedback

666

C. Deibele
ORNL, Oak Ridge, Tennessee, USA
D. Curry, R. Dickson
ORNL RAD, Oak Ridge, Tennessee, USA

Funding: ORNL is managed by UT-Battelle, LLC, under contract DE-AC05-00OR22725 for the U.S. Department of Energy.
It is desired to measure the linac current of a charged particle beam with a consistent accuracy over a dynamic range of over 120 dB. Conventional current transformers suffer from droop, can be susceptible to electromagnetic interference (EMI), and can be bandwidth limited. A novel detector and electronics were designed to maximize dynamic range of about 120 dB and measure risetimes on the order of 10 nanoseconds.

THPLB01

Linac Construction for China Spallation Neutron Source

linac, DTL, rfq, cavity

807

S. Fu, J. Li, H.C. Liu, H.F. Ouyang, X. Yin
IHEP, Beijing, People's Republic of China

Construction of China Spallation Neutron Source(CSNS) has been launched in September 2011. CSNS accelerator will provide 100kW proton beam on a target at beam energy of 1.6GeV. It consists of an 80MeV H⁻ linac and 1.6GeV rapid cycling synchrotron. Based on the prototyping experience, CSNS linac, including the front end and four DTL tanks, has finalized the design and started procurement. In this paper, we will first present an outline of the CSNS accelerator in its design and construction plan. Then the major prototyping results of the linac will be presented. Finally the linac construction progress in recent will be updated.

Slides THPLB01 [1.969 MB]

THPB023

Linac Construction for China Spallation Neutron Source

linac, DTL, rfq, cavity

897

S. Fu, J. Li, H.C. Liu, H.F. Ouyang, X. Yin
IHEP, Beijing, People's Republic of China

Construction of China Spallation Neutron Source(CSNS) has been launched in September 2011. CSNS accelerator will provide 100kW proton beam on a target at beam energy of 1.6GeV. It consists of an 80MeV H⁻ linac and 1.6GeV rapid cycling synchrotron. Based on the prototyping experience, CSNS linac, including the front end and four DTL tanks, has finalized the design and started procurement. In this paper, we will first present an outline of the CSNS accelerator in its design and construction plan. Then the major prototyping results of the linac will be presented. Finally the linac construction progress in recent will be updated.

THPB039

Design of a Four-Vane RFQ for China ADS Project

rfq, cavity, emittance, proton

942

Z.L. Zhang, X. Du, Y. He, X. Jin, C. Li, Y. Liu, A. Shi, L.P. Sun, B. Zhang, H.W. Zhao
IMP, Lanzhou, People's Republic of China
M.D. Hoff, A.R. Lambert, D. Li, J.W. Staples, S.P. Virostek
LBNL, Berkeley, California, USA
J. Wang
Lanzhou University of Technology, People's Republic of China
C. Zhang
IAP, Frankfurt am Main, Germany

A four-vane RFQ accelerator has been designed for the ADS project which has been launched in China since 2011. As one of the front ends of C-ADS LINAC, the RFQ works at a frequency of 162.5 MHz, accelerating the proton beam from 35 keV to 2.1 MeV. Due to the CW (continuous wave) operating mode, a small Kilpatric factor of 1.2 was adopted. At the same time, Pi-mode rods are employed to reduce the effect of dipole mode on quadrupole mode, and cavity tuning will be implemented by temperature adjustment of cooling water. Beam dynamics design, RF cavity design, thermal and stress analysis all will be presented in the paper.