IPAC2019 - Classification: MC4: Hadron Accelerators / A14 Neutron Spallation Facilities

Paper	Title	Page
MOZPLM1	Operation Status and Upgrade of CSNS	23
	S. Fu, S. Wang IHEP, Beijing, People’s Republic of China
	China Spallation Neutron Source (CSNS) accelerator complex consists of a front end, an 80MeV DTL linac, and a 1.6GeV Rapid Cycling Synchrotron (RCS).It is designed with a beam power of 100kW in the first phase and reserves upgrade capability to 500kW in the second phase. It has completed initial beam commissioning and has started user operation in 2018. And meanwhile the beam power is quickly going up from the initially above 10kW to 50kW during the user operation, and we can foresee that the designed beam power of 100 kW can be reached in the next year. This talk gives the most recent status of beam power ramping in CSNS, as well as future upgrade plan to increase the beam power up to 500 kW.
	Slides MOZPLM1 [12.157 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-MOZPLM1
About •	paper received ※ 15 May 2019 paper accepted ※ 23 May 2019 issue date ※ 21 June 2019
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TUPTS006	Tests at High RF Power of the ESS Medium Beta Cryomodule Demonstrator	1940
	P. Bosland, C. Arcambal, F. Ardellier, S. Berry, A. Bouygues, E. Cenni, G. Devanz, T. Hamelin, X. Hanus, O. Piquet, J.P. Poupeau, B. Renard, P. Sahuquet CEA-DRF-IRFU, France C. Darve ESS, Lund, Sweden P. Michelato INFN/LASA, Segrate (MI), Italy G. Olivier, J.P. Thermeau IPN, Orsay, France
	CEA is in charge of the 30 elliptical medium and high-beta cryomodules to be installed in the ESS tunnel in Lund, Sweden. Before launching the assembly of the series cryomodules, CEA developed a medium-beta cryomodule technology demonstrator in a collaboration with IPNO, LASA and ESS. This paper briefly presents the cryomodule assembly and summarizes the main results of the high RF power tests performed in 2018 in a dedicated test stand in CEA Saclay. The main ESS requirements were reached: E_acc = 16.7 MV/m in cavities, Pforward = 1.1 MW in power couplers, RF pulses length = 3.6 ms at 14 Hz. The piezo tuners efficiently compensated the Lorentz forces detuning and could stabilize the accelerating field better than 1% over the full length of the expected ESS 2.86 ms beam pulse without any LLRF regulation system. Following this successful validation CEA started the assembly of the first ESS medium-beta series cryomodule
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-TUPTS006
About •	paper received ※ 06 May 2019 paper accepted ※ 22 May 2019 issue date ※ 21 June 2019
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TUPTS038	The Operation Status of CSNS Front End	2024
	Y.W. An, Y.J. Lv, H.F. Ouyang, Y.C. Xiao IHEP, Beijing, People’s Republic of China X. Cao, W. Chen, T. Huang, H. Li, S. Liu, K. Xue IHEP CSNS, Guangdong Province, People’s Republic of China
	Funding: Work supported by National Natural Science Foundation of China(11875271) China spallation neutron source (CSNS), as the China’s first 100kW beam power pulsed neutron source, its operation target beam power is now larger than 50kW. During the beam power upgrading process of CSNS to 50kW from 2018 to 2019, many improvements have been made for the front end of CSNS. In this paper, the commissioning and improvement of front end as well as the laboratory construction are introduced. The improvements mainly focus on solving the stability of ion source and the spark of Radio Frequncy quadrupole (RFQ) caused by the pre-chopped beam into RFQ.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-TUPTS038
About •	paper received ※ 08 May 2019 paper accepted ※ 21 May 2019 issue date ※ 21 June 2019
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TUPTS048	Preliminary Study on the Injection System Upgrade for CSNS-II	2037
	S. Wang, M.Y. Huang, S.Y. Xu IHEP, Beijing, People’s Republic of China
	Funding: Work supported by National Natural Science Foundation of China (Project No. U1832210) The first phase of the China Spallation Neutron Source (CSNS-I) had completed the national acceptance in August, 2018. The physics design of the second phase (CSNS-II) has already begun. The CSNS-II accelerator upgrade contains three main components, including the Linac energy upgrade from 80 MeV to 300 MeV, injection system upgrade, and new Magnetic Alloy dual-harmonic cavity. In this paper, a preliminary study on the injection system upgrade had been done. A preliminary upgrade scheme for the injection system would be given. Furthermore, some preliminary simulation and calculation for the upgrade injection system had been carried out. The analysis results showed that most injection parameters can preliminarily meet the requirements of accelerator power upgrade.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-TUPTS048
About •	paper received ※ 15 May 2019 paper accepted ※ 23 May 2019 issue date ※ 21 June 2019
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPTS068	Progress on Design Studies for the ISIS II Upgrade	2075
	J.-B. Lagrange, D.J. Adams, C. Brown, H.V. Cavanagh, I.S.K. Gardner, P.T. Griffin-Hicks, B. Jones, D.J. Kelliher, A.P. Letchford, S. Machida, B.G. Pine, C.R. Prior, C.T. Rogers, J.W.G. Thomason, C.M. Warsop, R.E. Williamson STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom J. Pasternak, J.K. Pozimski STFC/RAL, Chilton, Didcot, Oxon, United Kingdom J. Pasternak, J.K. Pozimski Imperial College of Science and Technology, Department of Physics, London, United Kingdom G.H. Rees STFC/RAL/ASTeC, Chilton, Didcot, Oxon, United Kingdom
	ISIS, the spallation neutron source at the Rutherford Appleton Laboratory in the UK, uses a 50 Hz, 800 MeV proton RCS to provide a beam power of 0.2 MW, delivered in 0.4 us long pulses. Detailed studies are now under way for a major upgrade. Accelerator designs using FFAs, conventional accumulator and synchrotron rings are being considered for the required MW beam power. This paper summarises the scope of the different research incorporating results from recent target studies and user consultations. Preliminary results for Fixed Field Alternating gradient (FFA) rings and conventional rings located in the existing ISIS synchrotron hall are presented.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-TUPTS068
About •	paper received ※ 15 May 2019 paper accepted ※ 23 May 2019 issue date ※ 21 June 2019
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPTS086	SNS Proton Power Upgrade Status	2124
	M.A. Plum, D.E. Anderson, C.N. Barbier, M.S. Champion, M.S. Connell, J. Galambos, M.M. Harvey, M.P. Howell, S.-H. Kim, J. Moss, B.W. Riemer, R.W. Steffey ORNL, Oak Ridge, Tennessee, USA
	Funding: Work performed at (or work supported by) Oak Ridge National Laboratory, which is managed by UT-Battelle, LLC, under contract DE-AC05-00OR22725 for the U.S. Department of Energy. The Proton Power Upgrade (PPU) project at the Oak Ridge Spallation Neutron Source aims to double the beam power capability of the accelerator, from 1.4 to 2.8 MW. This will be done by a 30% increase in beam energy (from 1.0 to 1.3 GeV), and a 50% increase in beam current (from 25 to 38 mA averaged over a macropulse). The project is now well underway, after receiving approval to start preliminary design in April 2018. In this paper we will discuss recent technical developments in the project, including the warm linac RF system upgrade, a new topology for the high voltage converter modulators, an engineering review of the power capability of the injection dump, and a 2-MW-capability for the existing target station.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-TUPTS086
About •	paper received ※ 13 May 2019 paper accepted ※ 21 May 2019 issue date ※ 21 June 2019
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

FRXPLM1	Operations Experience of SNS at 1.4MW and Upgrade Plans for Doubling the Beam Power	4380
	J. Galambos ORNL, Oak Ridge, Tennessee, USA
	In 2018, the SNS begins operation at the design proton beam power of 1.4 MW. This talk will present the critical technical challenges that were overcome in order to take the final step in beam power with a higher than 90% reliability. In addition, the future project of the SNS for doubling the beam power from 1.4 MW to 2.8 MW and construction of second target station will be discussed.
	Slides FRXPLM1 [22.095 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-FRXPLM1
About •	paper received ※ 13 May 2019 paper accepted ※ 21 May 2019 issue date ※ 21 June 2019
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Page

Operation Status and Upgrade of CSNS

23

S. Fu, S. Wang
IHEP, Beijing, People’s Republic of China

China Spallation Neutron Source (CSNS) accelerator complex consists of a front end, an 80MeV DTL linac, and a 1.6GeV Rapid Cycling Synchrotron (RCS).It is designed with a beam power of 100kW in the first phase and reserves upgrade capability to 500kW in the second phase. It has completed initial beam commissioning and has started user operation in 2018. And meanwhile the beam power is quickly going up from the initially above 10kW to 50kW during the user operation, and we can foresee that the designed beam power of 100 kW can be reached in the next year. This talk gives the most recent status of beam power ramping in CSNS, as well as future upgrade plan to increase the beam power up to 500 kW.

Slides MOZPLM1 [12.157 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-MOZPLM1

About •

paper received ※ 15 May 2019 paper accepted ※ 23 May 2019 issue date ※ 21 June 2019

Export •

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

TUPTS006

Tests at High RF Power of the ESS Medium Beta Cryomodule Demonstrator

1940

P. Bosland, C. Arcambal, F. Ardellier, S. Berry, A. Bouygues, E. Cenni, G. Devanz, T. Hamelin, X. Hanus, O. Piquet, J.P. Poupeau, B. Renard, P. Sahuquet
CEA-DRF-IRFU, France
C. Darve
ESS, Lund, Sweden
P. Michelato
INFN/LASA, Segrate (MI), Italy
G. Olivier, J.P. Thermeau
IPN, Orsay, France

CEA is in charge of the 30 elliptical medium and high-beta cryomodules to be installed in the ESS tunnel in Lund, Sweden. Before launching the assembly of the series cryomodules, CEA developed a medium-beta cryomodule technology demonstrator in a collaboration with IPNO, LASA and ESS. This paper briefly presents the cryomodule assembly and summarizes the main results of the high RF power tests performed in 2018 in a dedicated test stand in CEA Saclay. The main ESS requirements were reached: E_acc = 16.7 MV/m in cavities, Pforward = 1.1 MW in power couplers, RF pulses length = 3.6 ms at 14 Hz. The piezo tuners efficiently compensated the Lorentz forces detuning and could stabilize the accelerating field better than 1% over the full length of the expected ESS 2.86 ms beam pulse without any LLRF regulation system. Following this successful validation CEA started the assembly of the first ESS medium-beta series cryomodule

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-TUPTS006

About •

paper received ※ 06 May 2019 paper accepted ※ 22 May 2019 issue date ※ 21 June 2019

Export •

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

TUPTS038

The Operation Status of CSNS Front End

2024

Y.W. An, Y.J. Lv, H.F. Ouyang, Y.C. Xiao
IHEP, Beijing, People’s Republic of China
X. Cao, W. Chen, T. Huang, H. Li, S. Liu, K. Xue
IHEP CSNS, Guangdong Province, People’s Republic of China

Funding: Work supported by National Natural Science Foundation of China(11875271)
China spallation neutron source (CSNS), as the China’s first 100kW beam power pulsed neutron source, its operation target beam power is now larger than 50kW. During the beam power upgrading process of CSNS to 50kW from 2018 to 2019, many improvements have been made for the front end of CSNS. In this paper, the commissioning and improvement of front end as well as the laboratory construction are introduced. The improvements mainly focus on solving the stability of ion source and the spark of Radio Frequncy quadrupole (RFQ) caused by the pre-chopped beam into RFQ.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-TUPTS038

About •

paper received ※ 08 May 2019 paper accepted ※ 21 May 2019 issue date ※ 21 June 2019

Export •

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

TUPTS048

Preliminary Study on the Injection System Upgrade for CSNS-II

2037

S. Wang, M.Y. Huang, S.Y. Xu
IHEP, Beijing, People’s Republic of China

Funding: Work supported by National Natural Science Foundation of China (Project No. U1832210)
The first phase of the China Spallation Neutron Source (CSNS-I) had completed the national acceptance in August, 2018. The physics design of the second phase (CSNS-II) has already begun. The CSNS-II accelerator upgrade contains three main components, including the Linac energy upgrade from 80 MeV to 300 MeV, injection system upgrade, and new Magnetic Alloy dual-harmonic cavity. In this paper, a preliminary study on the injection system upgrade had been done. A preliminary upgrade scheme for the injection system would be given. Furthermore, some preliminary simulation and calculation for the upgrade injection system had been carried out. The analysis results showed that most injection parameters can preliminarily meet the requirements of accelerator power upgrade.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-TUPTS048

About •

paper received ※ 15 May 2019 paper accepted ※ 23 May 2019 issue date ※ 21 June 2019

Export •

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

TUPTS068

Progress on Design Studies for the ISIS II Upgrade

2075

J.-B. Lagrange, D.J. Adams, C. Brown, H.V. Cavanagh, I.S.K. Gardner, P.T. Griffin-Hicks, B. Jones, D.J. Kelliher, A.P. Letchford, S. Machida, B.G. Pine, C.R. Prior, C.T. Rogers, J.W.G. Thomason, C.M. Warsop, R.E. Williamson
STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom
J. Pasternak, J.K. Pozimski
STFC/RAL, Chilton, Didcot, Oxon, United Kingdom
J. Pasternak, J.K. Pozimski
Imperial College of Science and Technology, Department of Physics, London, United Kingdom
G.H. Rees
STFC/RAL/ASTeC, Chilton, Didcot, Oxon, United Kingdom

ISIS, the spallation neutron source at the Rutherford Appleton Laboratory in the UK, uses a 50 Hz, 800 MeV proton RCS to provide a beam power of 0.2 MW, delivered in 0.4 us long pulses. Detailed studies are now under way for a major upgrade. Accelerator designs using FFAs, conventional accumulator and synchrotron rings are being considered for the required MW beam power. This paper summarises the scope of the different research incorporating results from recent target studies and user consultations. Preliminary results for Fixed Field Alternating gradient (FFA) rings and conventional rings located in the existing ISIS synchrotron hall are presented.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-TUPTS068

About •

paper received ※ 15 May 2019 paper accepted ※ 23 May 2019 issue date ※ 21 June 2019

Export •

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

TUPTS086

SNS Proton Power Upgrade Status

2124

M.A. Plum, D.E. Anderson, C.N. Barbier, M.S. Champion, M.S. Connell, J. Galambos, M.M. Harvey, M.P. Howell, S.-H. Kim, J. Moss, B.W. Riemer, R.W. Steffey
ORNL, Oak Ridge, Tennessee, USA

Funding: Work performed at (or work supported by) Oak Ridge National Laboratory, which is managed by UT-Battelle, LLC, under contract DE-AC05-00OR22725 for the U.S. Department of Energy.
The Proton Power Upgrade (PPU) project at the Oak Ridge Spallation Neutron Source aims to double the beam power capability of the accelerator, from 1.4 to 2.8 MW. This will be done by a 30% increase in beam energy (from 1.0 to 1.3 GeV), and a 50% increase in beam current (from 25 to 38 mA averaged over a macropulse). The project is now well underway, after receiving approval to start preliminary design in April 2018. In this paper we will discuss recent technical developments in the project, including the warm linac RF system upgrade, a new topology for the high voltage converter modulators, an engineering review of the power capability of the injection dump, and a 2-MW-capability for the existing target station.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-TUPTS086

About •

paper received ※ 13 May 2019 paper accepted ※ 21 May 2019 issue date ※ 21 June 2019

Export •

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

FRXPLM1

Operations Experience of SNS at 1.4MW and Upgrade Plans for Doubling the Beam Power

4380

J. Galambos
ORNL, Oak Ridge, Tennessee, USA

In 2018, the SNS begins operation at the design proton beam power of 1.4 MW. This talk will present the critical technical challenges that were overcome in order to take the final step in beam power with a higher than 90% reliability. In addition, the future project of the SNS for doubling the beam power from 1.4 MW to 2.8 MW and construction of second target station will be discussed.

Slides FRXPLM1 [22.095 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-FRXPLM1

About •

paper received ※ 13 May 2019 paper accepted ※ 21 May 2019 issue date ※ 21 June 2019

Export •

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