IPAC2014 - Classification: 04 Hadron Accelerators / A14 Neutron Spallation Facilities

Paper	Title	Page
WEPRO072	The Design of the Fast Raster System for the European Spallation Source	2118
	H.D. Thomsen, S.P. Møller ISA, Aarhus, Denmark
	The ESS will nominally operate with an average (peak) proton current of 2.5 mA (62.5 mA) at 2.0 GeV. To reduce the beam peak current density at the spallation target, the ESS HEBT will apply a fast transverse raster system consisting of 8 dithering magnet dipoles. The raster system sweeps the linac beamlet on the target surface and gives a rectangular intensity outline within a macropulse of 2.86 ms. The magnets are driven by triangular current waveforms of up to 40 kHz. The preliminary magnet design and power supply topology will be discussed.
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WEPRO073	The ESS High Energy Beam Transport after the 2013 Design Update	2121
	H.D. Thomsen, S.P. Møller ISA, Aarhus, Denmark
	Following an optimization of the European Spallation Source (ESS) linac, a number of changes have been introduced in the High Energy Beam Transport (HEBT). In particular, about 120 m of beam transport has been allocated to enable an extension of the superconducting linac, thus providing some contingency against poor linac performance and potentially allowing a future beam power upgrade. The changes in layout and beam optics in all HEBT lines will be discussed.
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WEPRO074	Performance of the ESS High Energy Beam Transport under Non-nominal Conditions	2124
	H.D. Thomsen, S.P. Møller ISA, Aarhus, Denmark
	With a nominal beam power of 5 MW, the demands for low relative beam losses in the ESS linac are unprecedented. In the HEBT, where the beam first reaches full power, this is especially relevant. The acceptance of the HEBT should thus encompass beams of non-nominal parameters and ideally be tolerant to partial hardware failure for at least a pulse train of 2.86 ms. In this paper, the sensitivity towards errors in beam parameters and optical elements will be presented.
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WEPRO075	The Conceptual Design of the China White Neutron Source	2127
	J.H. Li, X.C. Ruan, X. Wang CIAE, Beijing, People's Republic of China J.H. Billen, K.R. Crandall TechSource, Los Alamos, New Mexico, USA J. Stovall ESS, Lund, Sweden J.Y. Tang IHEP, Beijing, People's Republic of China L.M. Young AES, Medford, New York, USA
	Funding: Work supported by NSFC of (91126003) In order to feed the nuclear data needs for design of the Chinese Accelerator Driven sub-critical System (CADS) and new generation nuclear energy systems, we plan to construct the China White Neutron Source (CWNS). The CWNS will be composed of a Proton Linac, an Accumulator Ring, a Target and Experimental Facilities. The linac is designed to deliver a proton beam having an average current of 1 mA at energy up to 300 MeV. The revolution frequency of the accumulator ring will be ~1.4 MHz. Two spallation targets are planned, with one for short pulsed modes and the other for micro-pulsed mode.
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WEPRO076	Constructing the ESS Linear Accelerator: Pragmatic Approaches to Design and System Integration at the European Spallation Source	2131
	G. Lanfranco, M.J. Conlon, N. Gazis, E. Tanke, E. Vaena ESS, Lund, Sweden
	The European Spallation Source (ESS) is a neutron science facility comprising a linear H⁺ accelerator, a tungsten target station, 22 neutron instruments, a suite of laboratories and a supercomputing data processing centre. The Accelerator project represents about a third of the total ESS construction budget and several European countries participate as in-kind contributing partners to it. It is crucial to guarantee requirements consistency, clarity of interface definition and proper space allocation. Potential functional and design inconsistencies must be promptly detected and actively resolved, bridging the project from the conceptual design towards a smooth, cost and time effective installation. Moreover, while the correct synergies are established and maintained, the organisational burden has to be minimized, aspect particularly relevant given the intrinsic prototypic nature of projects of this type. This paper describes the system architecture and the tools deployed to integrate the design of the ESS Linear Accelerator and to prepare for its installation.
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WEPRO077	Thermal Neutron Beam Characterization at the HRPT Instrument at the Swiss Spallation Neutron Source	2134
	V. Talanov, D. Cheptiakov, U. Filges, S.H. Forss, T. Panzner, V. Pomjakushin, E. Rantsiou, T. Reiss, M. Wohlmuther PSI, Villigen PSI, Switzerland
	The Swiss spallation neutron source (SINQ) at Paul Scherrer Institut (PSI) provides beams of thermal and cold neutrons to different neutron instruments. In a view of a potential SINQ upgrade, an experimental program characterizing the current performance of SINQ neutron beams was started in 2013. We present experimental results of the irradiation of imaging plates and gold foils at one of SINQ thermal neutron beam lines that hosts the high resolution powder diffractometer (HRPT) and compare the experimental results to the numerical MCNPX simulations of the neutron flux from the SINQ target-moderator system.
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WEPRO078	Background Calculations for the High Energy Beam Transport Region of the European Spallation Source	2137
	R.J. Barlow, A.M. Toader University of Huddersfield, Huddersfield, United Kingdom L. Tchelidze ESS, Lund, Sweden H.D. Thomsen ISA, Aarhus, Denmark
	Expected backgrounds in the final accelerator-to-target region of the European Spallation Source, to be built in Lund, Sweden, have been calculated using the MCNPX program. We consider the effects of losses from the beam, both along the full length and localised at the bending magnets, and also backsplash from the target. The prompt background is calculated, and also the residual dose, as a function of time, arising from activation of the beam components. Activation of the air is also determined. The model includes the focussing and rasterising magnets, and shows the effects of the concrete walls of the tunnel. We give the implications for the design and operation of the accelerator.
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WEPRO079	Accelerator Systems Modifications for a Second Target Station at the Oak Ridge Spallation Neutron Source	2140
	M.A. Plum, J. Galambos, S.-H. Kim ORNL, Oak Ridge, Tennessee, USA
	Funding: ORNL/SNS is managed by UT-Battelle, LLC, for the U.S. Department of Energy under contract DE-AC05-00OR22725. A second target station is planned for the Oak Ridge Spallation Neutron Source. The ion source will be upgraded to increase the peak current from 38 to 49 mA, additional superconducting RF cavities will be added to the linac to increase the H− beam energy from 933 to 1300 MeV, and the accumulator ring will receive modifications to the injection and extraction systems to accommodate the higher beam energy. After pulse compression in the storage ring one sixth of the beam pulses (10 out of 60 Hz) will be diverted to the second target by kicker and septum magnets added to the existing Ring to Target Beam Transport (RTBT) line. No further modifications will be made to the RTBT so that when the kicker and septum magnets are turned off the original target 1 beam transport lattice will be unaffected. In this paper we will discuss these and other planned modifications and upgrades to the accelerator facility, and also the status of this project.
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Paper

Title

Page

The Design of the Fast Raster System for the European Spallation Source

2118

H.D. Thomsen, S.P. Møller
ISA, Aarhus, Denmark

The ESS will nominally operate with an average (peak) proton current of 2.5 mA (62.5 mA) at 2.0 GeV. To reduce the beam peak current density at the spallation target, the ESS HEBT will apply a fast transverse raster system consisting of 8 dithering magnet dipoles. The raster system sweeps the linac beamlet on the target surface and gives a rectangular intensity outline within a macropulse of 2.86 ms. The magnets are driven by triangular current waveforms of up to 40 kHz. The preliminary magnet design and power supply topology will be discussed.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-WEPRO072

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

WEPRO073

The ESS High Energy Beam Transport after the 2013 Design Update

2121

H.D. Thomsen, S.P. Møller
ISA, Aarhus, Denmark

Following an optimization of the European Spallation Source (ESS) linac, a number of changes have been introduced in the High Energy Beam Transport (HEBT). In particular, about 120 m of beam transport has been allocated to enable an extension of the superconducting linac, thus providing some contingency against poor linac performance and potentially allowing a future beam power upgrade. The changes in layout and beam optics in all HEBT lines will be discussed.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-WEPRO073

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

WEPRO074

Performance of the ESS High Energy Beam Transport under Non-nominal Conditions

2124

H.D. Thomsen, S.P. Møller
ISA, Aarhus, Denmark

With a nominal beam power of 5 MW, the demands for low relative beam losses in the ESS linac are unprecedented. In the HEBT, where the beam first reaches full power, this is especially relevant. The acceptance of the HEBT should thus encompass beams of non-nominal parameters and ideally be tolerant to partial hardware failure for at least a pulse train of 2.86 ms. In this paper, the sensitivity towards errors in beam parameters and optical elements will be presented.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-WEPRO074

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WEPRO075

The Conceptual Design of the China White Neutron Source

2127

J.H. Li, X.C. Ruan, X. Wang
CIAE, Beijing, People's Republic of China
J.H. Billen, K.R. Crandall
TechSource, Los Alamos, New Mexico, USA
J. Stovall
ESS, Lund, Sweden
J.Y. Tang
IHEP, Beijing, People's Republic of China
L.M. Young
AES, Medford, New York, USA

Funding: Work supported by NSFC of (91126003)
In order to feed the nuclear data needs for design of the Chinese Accelerator Driven sub-critical System (CADS) and new generation nuclear energy systems, we plan to construct the China White Neutron Source (CWNS). The CWNS will be composed of a Proton Linac, an Accumulator Ring, a Target and Experimental Facilities. The linac is designed to deliver a proton beam having an average current of 1 mA at energy up to 300 MeV. The revolution frequency of the accumulator ring will be ~1.4 MHz. Two spallation targets are planned, with one for short pulsed modes and the other for micro-pulsed mode.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-WEPRO075

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WEPRO076

Constructing the ESS Linear Accelerator: Pragmatic Approaches to Design and System Integration at the European Spallation Source

2131

G. Lanfranco, M.J. Conlon, N. Gazis, E. Tanke, E. Vaena
ESS, Lund, Sweden

The European Spallation Source (ESS) is a neutron science facility comprising a linear H⁺ accelerator, a tungsten target station, 22 neutron instruments, a suite of laboratories and a supercomputing data processing centre. The Accelerator project represents about a third of the total ESS construction budget and several European countries participate as in-kind contributing partners to it. It is crucial to guarantee requirements consistency, clarity of interface definition and proper space allocation. Potential functional and design inconsistencies must be promptly detected and actively resolved, bridging the project from the conceptual design towards a smooth, cost and time effective installation. Moreover, while the correct synergies are established and maintained, the organisational burden has to be minimized, aspect particularly relevant given the intrinsic prototypic nature of projects of this type. This paper describes the system architecture and the tools deployed to integrate the design of the ESS Linear Accelerator and to prepare for its installation.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-WEPRO076

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WEPRO077

Thermal Neutron Beam Characterization at the HRPT Instrument at the Swiss Spallation Neutron Source

2134

V. Talanov, D. Cheptiakov, U. Filges, S.H. Forss, T. Panzner, V. Pomjakushin, E. Rantsiou, T. Reiss, M. Wohlmuther
PSI, Villigen PSI, Switzerland

The Swiss spallation neutron source (SINQ) at Paul Scherrer Institut (PSI) provides beams of thermal and cold neutrons to different neutron instruments. In a view of a potential SINQ upgrade, an experimental program characterizing the current performance of SINQ neutron beams was started in 2013. We present experimental results of the irradiation of imaging plates and gold foils at one of SINQ thermal neutron beam lines that hosts the high resolution powder diffractometer (HRPT) and compare the experimental results to the numerical MCNPX simulations of the neutron flux from the SINQ target-moderator system.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-WEPRO077

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WEPRO078

Background Calculations for the High Energy Beam Transport Region of the European Spallation Source

2137

R.J. Barlow, A.M. Toader
University of Huddersfield, Huddersfield, United Kingdom
L. Tchelidze
ESS, Lund, Sweden
H.D. Thomsen
ISA, Aarhus, Denmark

Expected backgrounds in the final accelerator-to-target region of the European Spallation Source, to be built in Lund, Sweden, have been calculated using the MCNPX program. We consider the effects of losses from the beam, both along the full length and localised at the bending magnets, and also backsplash from the target. The prompt background is calculated, and also the residual dose, as a function of time, arising from activation of the beam components. Activation of the air is also determined. The model includes the focussing and rasterising magnets, and shows the effects of the concrete walls of the tunnel. We give the implications for the design and operation of the accelerator.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-WEPRO078

Export •

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

WEPRO079

Accelerator Systems Modifications for a Second Target Station at the Oak Ridge Spallation Neutron Source

2140

M.A. Plum, J. Galambos, S.-H. Kim
ORNL, Oak Ridge, Tennessee, USA

Funding: ORNL/SNS is managed by UT-Battelle, LLC, for the U.S. Department of Energy under contract DE-AC05-00OR22725.
A second target station is planned for the Oak Ridge Spallation Neutron Source. The ion source will be upgraded to increase the peak current from 38 to 49 mA, additional superconducting RF cavities will be added to the linac to increase the H− beam energy from 933 to 1300 MeV, and the accumulator ring will receive modifications to the injection and extraction systems to accommodate the higher beam energy. After pulse compression in the storage ring one sixth of the beam pulses (10 out of 60 Hz) will be diverted to the second target by kicker and septum magnets added to the existing Ring to Target Beam Transport (RTBT) line. No further modifications will be made to the RTBT so that when the kicker and septum magnets are turned off the original target 1 beam transport lattice will be unaffected. In this paper we will discuss these and other planned modifications and upgrades to the accelerator facility, and also the status of this project.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-WEPRO079

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