HB2018 - List of Keywords (target)

Paper	Title	Other Keywords	Page
TUP1WE03	Beam Instruments for High Power Spallation Neutron Source and Facility for ADS	proton, radiation, neutron, experiment	99
	S.I. Meigo JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken, Japan
	As increase of beam power, beam instruments play an essential role in the Hadron accelerator facility. In J-PARC, the pitting erosion on the mercury target vessel for the spallation neutron source is one of a pivotal issue to operate with the high power of the beam operation. Since the erosion is proportional to the 4th power of the beam current density, the minimization of the peak current density is required. To achieve low current density, the beam-flattening system by nonlinear beam optics using octupole magnets in J-PARC. By the present system, the peak density was successfully reduced by 30% compared to the ordinary linear optics. Also in J-PARC, transmutation experimental facility is planned for the realization of the accelerator-driven system (ADS), which will employ powerful accelerator with the beam power of 30 MW. To achieve equivalent damage on the target as the ADS, the target will be received high current density. For the continuous observation of the beam status on the target, a robust beam profile monitor is required. We have been developed beam profile monitor by using heavy-ion of Ar beam to give the damage efficiently.
	Slides TUP1WE03 [15.133 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-HB2018-TUP1WE03
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUP2WE01	Injection Foil Temperature Measurements at the SNS Accelerator	radiation, vacuum, linac, controls	104
	W. Blokland, C.F. Luck, A. Rakhman ORNL, Oak Ridge, Tennessee, USA N.J. Evans ORNL RAD, Oak Ridge, Tennessee, USA
	Funding: This manuscript has been authored by UT-Battelle, LLC, under Contract No. DE-AC0500OR22725 with the U.S. Department of Energy. The SNS uses charge exchange injection to minimize losses during the accumulation of the accelerated beam in the ring. A stripper foil implements this by removing the electrons from the high intensity H⁻ beam coming from the linac. At a beam power of 1.2 MW, the foil lasts for many weeks, sometimes months. However, given the upgrade to 2.8 MW, it is important to know the current temperature of stripper foil in order to estimate its lifetime for the new beam power and beam size. In this paper, we discuss several methods to measure the temperature of stripper foil exposed to current operating conditions of the SNS accelerator. Given the high radiation in the vicinity of the foil, the uncertainty in the foil's emissivity, and available resources, we chose a two-wavelength pyrometer that is located 40 m from the foil. The pyrometer is composed of two mirrors, a refracting telescope, and two photodiodes. We present the calibration data and the temporally resolved measurements made with this pyrometer.
	Slides TUP2WE01 [13.195 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-HB2018-TUP2WE01
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUP2WE02	The Beam Conditions on the Target and its Operational Impacts on Beam Intercepting Devices at European Spallation Source	proton, radiation, neutron, operation	110
	Y. Lee, R. Miyamoto, T.J. Shea ESS, Lund, Sweden H.D. Thomsen ISA, Aarhus, Denmark
	A large flux of spallation neutrons will be produced at the European Spallation Source (ESS) by impinging high power proton beam on the tungsten target. Until the 5 MW proton beam is stopped by the spallation target, it travels through a number of beam intercepting devices (BIDs), which include the proton beam window, a multi-wire beam profile monitor, an aperture monitor, the beam entrance window, spallation material and the target shroud. The beam-induced thermo-mechanical loads and the damage dose rate in the BIDs are largely determined by the beam energy and the beam current density. At ESS, the proton beam energy will be commissioned step-wisely, from 570 MeV towards 2 GeV. The beam current density on the BIDs in the target station is equally painted by raster beam optics. The ESS Linac and its beam optics will create rectangular beam profiles on the target with varying beam intensities. In this paper, we study the impacts of different plausible beam intensities and beam energies on the thermo-mechanical loads and radiation damage rates in the BIDs at the ESS target station.
	Slides TUP2WE02 [9.826 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-HB2018-TUP2WE02
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUP2WE03	Radiation Damage Calculation in PHITS and Benchmarking Experiment for Cryogenic-Sample High-Energy Proton Irradiation	proton, radiation, experiment, scattering	116
	Y. Iwamoto, D. Satoh JAEA, Ibaraki-ken, Japan Y. Ishi, Y. Kuriyama, T. Uesugi, H. Yashima, T. Yoshiie Kyoto University, Research Reactor Institute, Osaka, Japan H. Matsuda, S.I. Meigo JAEA/J-PARC, Tokai-mura, Japan T. Nakamoto KEK, Ibaraki, Japan K. Niita Research Organization for Information Science & Technology, Ibaraki, Japan R.M. Ronningen FRIB, East Lansing, Michigan, USA T. Shima RCNP, Osaka, Japan
	Funding: The experimental study was supported by JSPS KAKENHI, Grant Number JP 16H04638 and 25820450. The calculation work was supported in part by the US National Science Foundation under grant PHY06-06007. The radiation damage model in the Particle and Heavy Ion Transport code System (PHITS) has been developed using the screened Coulomb scattering to evaluate the energy of the target Primary Knock on Atom (PKA) created by the projectile and the secondary particles which include all particles created from the sequential nuclear reactions. For the high-energy proton incident reactions, a target PKA created by the secondary particles was more dominant than a target PKA created by the projectile. To validate prediction of DPA values in metals irradiated by >100 MeV protons, we developed a proton irradiation device with a Gifford-McMahon (GM) cryocooler to cryogenically cool wire samples. By using this device, the defect-induced electrical resistivity changes related to the DPA cross section of copper and aluminum were measured under irradiation with 125 and 200 MeV protons at cryogenic temperature. A comparison of the experimental DPA cross sections with the calculated results indicates that the athermal-recombination-corrected displacement damage (arc-dpa) provide better quantitative descriptions of the DPA cross section than NRT-dpa without defect production efficiencies.
	Slides TUP2WE03 [4.747 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-HB2018-TUP2WE03
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUA2WD01	FAIR Commissioning - Concepts and Strategies in View of High-Intensity Operation	operation, MMI, controls, experiment	141
	R.J. Steinhagen GSI, Darmstadt, Germany
	The Facility for Anti-Proton and Ion Research (FAIR) presently under construction, extends and supersedes GSI's existing infrastructure. Its core challenges include the precise control of highest proton and uranium ion beam intensities, the required extreme high vacuum conditions, machine protection and activation issues while providing a high degree of multi-user mode of operation with facility reconfiguration on time-scales of a few times per week. Being based on best-practices at other laboratories, this contribution outlines the applicable hardware and beam commissioning strategies, as well as concepts, beam-based and other accelerator systems that are being tested at the existing facility in view of the prospective FAIR operation.
	Slides TUA2WD01 [10.735 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-HB2018-TUA2WD01
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUA2WD03	Automated Operation of EBIS Injector at BNL	heavy-ion, operation, linac, laser	153
	T. Kanesue, E.N. Beebe, S. Binello, B.D. Coe, M.R. Costanzo, L. DeSanto, S. Ikeda, J.P. Jamilkowski, N.A. Kling, D. Lehn, C.J. Liaw, V. Lo Destro, D.R. McCafferty, J. Morris, M. Okamura, R.H. Olsen, D. Raparia, R. Schoepfer, F. Severino, L. Smart, K. Zeno BNL, Upton, Long Island, New York, USA
	The RHIC-EBIS pre-injector is a heavy ion pre-injector to deliver multiple heavy ion species at 2 MeV/u to the AGS-Booster at the RHIC accelerator complex. In addition to collider experiments at RHIC, multiple heavy ion species are used for the NASA Space Radiation Laboratory (NSRL) to evaluate the risk of radiation in space in radiobiology, physics, and engineering. A GCR simulator is one of the operation modes of NSRL to simulate a galactic cosmic ray event, which requires switching multiple ion species within a short period of time. The RHIC-EBIS pre-injector delivers various heavy ion species independently for simultaneous operation of RHIC and NSRL. We developed an automated scheme of the rapid species change and it is routinely used by NSRL or Main Control Room for daily operation without assistance of RHIC-EBIS experts. The number of species change exceeds one hundred. This paper describes the automated operation of the RHIC-EBIS pre-injector and the operational performance. This work has been supported by Brookhaven Science Associates, LLC under Contract No. DE-SC0012704 with the U.S. Department of Energy, and by the National Aeronautics and Space Administration.
	Slides TUA2WD03 [1.999 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-HB2018-TUA2WD03
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEP1WB01	Beam Dynamics of the ESS Linac	linac, cavity, quadrupole, rfq	206
	Y. Levinsen, R. De Prisco, M. Eshraqi, N. Milas, R. Miyamoto, D.C. Plostinar, A. Ponton ESS, Lund, Sweden
	The ESS linac will deliver an unprecedented 5 MW of average beam power when completed. Beyond the 90 MeV normal conducting front-end, the acceleration is performed using SC structures up to the design energy of 2 GeV. As the ESS will send the beam to a fixed tungsten target, the emittance is not as important a factor as in injectors. However, the losses have to be studied in detail, including not only the average operational loss required to be of less than 1 W/m, but also the accidental losses, losses due to failure and other potentially damaging losses. The commissioning of the ion source and LEBT starts this year and will continue with the RFQ next year. In this contribution we will discuss the beam dynamics aspects and challenges of the ESS linac.
	Slides WEP1WB01 [2.084 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-HB2018-WEP1WB01
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEP2PO032	A Secondary Emission Monitor in the SINQ Beam Line for Improved Target Protection	electron, electronics, proton, GUI	334
	R. Dölling, M. Rohrer PSI, Villigen PSI, Switzerland
	A 4-strip secondary-emission monitor (SEM) has been installed in the beam line to the SINQ neutron source to detect irregular fractions of the megawatt proton beam which might damage the spallation target. We discuss the estimated performance of the monitor as well as its design and implementation.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-HB2018-WEP2PO032
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Other Keywords

Page

TUP1WE03

Beam Instruments for High Power Spallation Neutron Source and Facility for ADS

proton, radiation, neutron, experiment

99

S.I. Meigo
JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken, Japan

As increase of beam power, beam instruments play an essential role in the Hadron accelerator facility. In J-PARC, the pitting erosion on the mercury target vessel for the spallation neutron source is one of a pivotal issue to operate with the high power of the beam operation. Since the erosion is proportional to the 4th power of the beam current density, the minimization of the peak current density is required. To achieve low current density, the beam-flattening system by nonlinear beam optics using octupole magnets in J-PARC. By the present system, the peak density was successfully reduced by 30% compared to the ordinary linear optics. Also in J-PARC, transmutation experimental facility is planned for the realization of the accelerator-driven system (ADS), which will employ powerful accelerator with the beam power of 30 MW. To achieve equivalent damage on the target as the ADS, the target will be received high current density. For the continuous observation of the beam status on the target, a robust beam profile monitor is required. We have been developed beam profile monitor by using heavy-ion of Ar beam to give the damage efficiently.

Slides TUP1WE03 [15.133 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-HB2018-TUP1WE03

Export •

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

TUP2WE01

Injection Foil Temperature Measurements at the SNS Accelerator

radiation, vacuum, linac, controls

104

W. Blokland, C.F. Luck, A. Rakhman
ORNL, Oak Ridge, Tennessee, USA
N.J. Evans
ORNL RAD, Oak Ridge, Tennessee, USA

Funding: This manuscript has been authored by UT-Battelle, LLC, under Contract No. DE-AC0500OR22725 with the U.S. Department of Energy.
The SNS uses charge exchange injection to minimize losses during the accumulation of the accelerated beam in the ring. A stripper foil implements this by removing the electrons from the high intensity H⁻ beam coming from the linac. At a beam power of 1.2 MW, the foil lasts for many weeks, sometimes months. However, given the upgrade to 2.8 MW, it is important to know the current temperature of stripper foil in order to estimate its lifetime for the new beam power and beam size. In this paper, we discuss several methods to measure the temperature of stripper foil exposed to current operating conditions of the SNS accelerator. Given the high radiation in the vicinity of the foil, the uncertainty in the foil's emissivity, and available resources, we chose a two-wavelength pyrometer that is located 40 m from the foil. The pyrometer is composed of two mirrors, a refracting telescope, and two photodiodes. We present the calibration data and the temporally resolved measurements made with this pyrometer.

Slides TUP2WE01 [13.195 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-HB2018-TUP2WE01

Export •

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

TUP2WE02

The Beam Conditions on the Target and its Operational Impacts on Beam Intercepting Devices at European Spallation Source

proton, radiation, neutron, operation

110

Y. Lee, R. Miyamoto, T.J. Shea
ESS, Lund, Sweden
H.D. Thomsen
ISA, Aarhus, Denmark

A large flux of spallation neutrons will be produced at the European Spallation Source (ESS) by impinging high power proton beam on the tungsten target. Until the 5 MW proton beam is stopped by the spallation target, it travels through a number of beam intercepting devices (BIDs), which include the proton beam window, a multi-wire beam profile monitor, an aperture monitor, the beam entrance window, spallation material and the target shroud. The beam-induced thermo-mechanical loads and the damage dose rate in the BIDs are largely determined by the beam energy and the beam current density. At ESS, the proton beam energy will be commissioned step-wisely, from 570 MeV towards 2 GeV. The beam current density on the BIDs in the target station is equally painted by raster beam optics. The ESS Linac and its beam optics will create rectangular beam profiles on the target with varying beam intensities. In this paper, we study the impacts of different plausible beam intensities and beam energies on the thermo-mechanical loads and radiation damage rates in the BIDs at the ESS target station.

Slides TUP2WE02 [9.826 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-HB2018-TUP2WE02

Export •

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

TUP2WE03

Radiation Damage Calculation in PHITS and Benchmarking Experiment for Cryogenic-Sample High-Energy Proton Irradiation

proton, radiation, experiment, scattering

116

Y. Iwamoto, D. Satoh
JAEA, Ibaraki-ken, Japan
Y. Ishi, Y. Kuriyama, T. Uesugi, H. Yashima, T. Yoshiie
Kyoto University, Research Reactor Institute, Osaka, Japan
H. Matsuda, S.I. Meigo
JAEA/J-PARC, Tokai-mura, Japan
T. Nakamoto
KEK, Ibaraki, Japan
K. Niita
Research Organization for Information Science & Technology, Ibaraki, Japan
R.M. Ronningen
FRIB, East Lansing, Michigan, USA
T. Shima
RCNP, Osaka, Japan

Funding: The experimental study was supported by JSPS KAKENHI, Grant Number JP 16H04638 and 25820450. The calculation work was supported in part by the US National Science Foundation under grant PHY06-06007.
The radiation damage model in the Particle and Heavy Ion Transport code System (PHITS) has been developed using the screened Coulomb scattering to evaluate the energy of the target Primary Knock on Atom (PKA) created by the projectile and the secondary particles which include all particles created from the sequential nuclear reactions. For the high-energy proton incident reactions, a target PKA created by the secondary particles was more dominant than a target PKA created by the projectile. To validate prediction of DPA values in metals irradiated by >100 MeV protons, we developed a proton irradiation device with a Gifford-McMahon (GM) cryocooler to cryogenically cool wire samples. By using this device, the defect-induced electrical resistivity changes related to the DPA cross section of copper and aluminum were measured under irradiation with 125 and 200 MeV protons at cryogenic temperature. A comparison of the experimental DPA cross sections with the calculated results indicates that the athermal-recombination-corrected displacement damage (arc-dpa) provide better quantitative descriptions of the DPA cross section than NRT-dpa without defect production efficiencies.

Slides TUP2WE03 [4.747 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-HB2018-TUP2WE03

Export •

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

TUA2WD01

FAIR Commissioning - Concepts and Strategies in View of High-Intensity Operation

operation, MMI, controls, experiment

141

R.J. Steinhagen
GSI, Darmstadt, Germany

The Facility for Anti-Proton and Ion Research (FAIR) presently under construction, extends and supersedes GSI's existing infrastructure. Its core challenges include the precise control of highest proton and uranium ion beam intensities, the required extreme high vacuum conditions, machine protection and activation issues while providing a high degree of multi-user mode of operation with facility reconfiguration on time-scales of a few times per week. Being based on best-practices at other laboratories, this contribution outlines the applicable hardware and beam commissioning strategies, as well as concepts, beam-based and other accelerator systems that are being tested at the existing facility in view of the prospective FAIR operation.

Slides TUA2WD01 [10.735 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-HB2018-TUA2WD01

Export •

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

TUA2WD03

Automated Operation of EBIS Injector at BNL

heavy-ion, operation, linac, laser

153

T. Kanesue, E.N. Beebe, S. Binello, B.D. Coe, M.R. Costanzo, L. DeSanto, S. Ikeda, J.P. Jamilkowski, N.A. Kling, D. Lehn, C.J. Liaw, V. Lo Destro, D.R. McCafferty, J. Morris, M. Okamura, R.H. Olsen, D. Raparia, R. Schoepfer, F. Severino, L. Smart, K. Zeno
BNL, Upton, Long Island, New York, USA

The RHIC-EBIS pre-injector is a heavy ion pre-injector to deliver multiple heavy ion species at 2 MeV/u to the AGS-Booster at the RHIC accelerator complex. In addition to collider experiments at RHIC, multiple heavy ion species are used for the NASA Space Radiation Laboratory (NSRL) to evaluate the risk of radiation in space in radiobiology, physics, and engineering. A GCR simulator is one of the operation modes of NSRL to simulate a galactic cosmic ray event, which requires switching multiple ion species within a short period of time. The RHIC-EBIS pre-injector delivers various heavy ion species independently for simultaneous operation of RHIC and NSRL. We developed an automated scheme of the rapid species change and it is routinely used by NSRL or Main Control Room for daily operation without assistance of RHIC-EBIS experts. The number of species change exceeds one hundred. This paper describes the automated operation of the RHIC-EBIS pre-injector and the operational performance.
This work has been supported by Brookhaven Science Associates, LLC under Contract No. DE-SC0012704 with the U.S. Department of Energy, and by the National Aeronautics and Space Administration.

Slides TUA2WD03 [1.999 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-HB2018-TUA2WD03

Export •

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

WEP1WB01

Beam Dynamics of the ESS Linac

linac, cavity, quadrupole, rfq

206

Y. Levinsen, R. De Prisco, M. Eshraqi, N. Milas, R. Miyamoto, D.C. Plostinar, A. Ponton
ESS, Lund, Sweden

The ESS linac will deliver an unprecedented 5 MW of average beam power when completed. Beyond the 90 MeV normal conducting front-end, the acceleration is performed using SC structures up to the design energy of 2 GeV. As the ESS will send the beam to a fixed tungsten target, the emittance is not as important a factor as in injectors. However, the losses have to be studied in detail, including not only the average operational loss required to be of less than 1 W/m, but also the accidental losses, losses due to failure and other potentially damaging losses. The commissioning of the ion source and LEBT starts this year and will continue with the RFQ next year. In this contribution we will discuss the beam dynamics aspects and challenges of the ESS linac.

Slides WEP1WB01 [2.084 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-HB2018-WEP1WB01

Export •

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

WEP2PO032

A Secondary Emission Monitor in the SINQ Beam Line for Improved Target Protection

electron, electronics, proton, GUI

334

R. Dölling, M. Rohrer
PSI, Villigen PSI, Switzerland

A 4-strip secondary-emission monitor (SEM) has been installed in the beam line to the SINQ neutron source to detect irregular fractions of the megawatt proton beam which might damage the spallation target. We discuss the estimated performance of the monitor as well as its design and implementation.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-HB2018-WEP2PO032

Export •

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