HB2018 - List of Keywords (radiation)

Paper	Title	Other Keywords	Page
TUP1WE03	Beam Instruments for High Power Spallation Neutron Source and Facility for ADS	target, proton, 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	vacuum, linac, target, 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	target, proton, 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, target, 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)

TUP2WA01	Optical Stochastic Cooling Experiment at the Fermilab IOTA Ring	undulator, optics, electron, experiment	168
	J.D. Jarvis, V.A. Lebedev, H. Piekarz, P. Piot, A.L. Romanov, J. Ruan Fermilab, Batavia, Illinois, USA M.B. Andorf, P. Piot Northern Illinois University, DeKalb, Illinois, USA
	Funding: Fermi National Accelerator Laboratory is operated by Fermi Research Alliance, LLC under Contract No. DE-AC02-07CH11359 with the United States Department of Energy. Beam cooling enables an increase of peak and average luminosities and significantly expands the discovery potential of colliders; therefore it is an indispensable component of any modern design. Optical Stochastic Cooling (OSC) is a high-bandwidth, beam-cooling technique that will advance the present state-of-the-art, stochastic cooling rate by more than three orders of magnitude. It is an enabling technology for next-generation, discovery-science machines at the energy and intensity frontiers including hadron and electron-ion colliders. This paper presents the status of our experimental effort to demonstrate OSC at the Integrable Optics Test Accelerator (IOTA) ring, a testbed for advanced beam-physics concepts and technologies that is currently being commissioned at Fermilab. Our recent efforts are centered on the development of an integrated design that is prepared for final engineering and fabrication. The paper also presents a comparison of theoretical calculations and numerical simulations of the pickup-undulator radiation and its interaction with electrons in the kicker-undulator.
	Slides TUP2WA01 [20.009 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-HB2018-TUP2WA01
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEP2PO028	Conceptual Design of FLNR JINR Radiation Facility Based on DC130 Cyclotron	cyclotron, extraction, vacuum, experiment	324
	N.Yu. Kazarinov, P.Yu. Apel, V. Bashevoy, V. Bekhterev, S.L. Bogomolov, O.N. Borisov, J. Franko, G.G. Gulbekyan, I.A. Ivanenko, I.V. Kalagin, V.I. Mironov, S.V. Mitrofanov, V.A. Semin, V.A. Skuratov, A. Tikhomirov JINR, Dubna, Moscow Region, Russia
	Flerov Laboratory of Nuclear Reaction of Joint Institute for Nuclear Research begins the works under the conceptual design of radiation facility based on the DC130 cyclotron. The facility is intended for SEE testing of microchips, for production of track membranes and for solving of applied physics problems. The DC130 cyclotron will accelerate heavy ions with mass-to-charge ratio A/Z of the range from 5 to 8 up to fixed energies 2 and 4.5 MeV per unit mass. The intensity of the accelerated ions will be about 1 pmcA for lighter ions (A<50) and about 0.1 pmcA for heavier ions (A>50). The injection into cyclotron will be realized from the external DECRIS-SC superconducting ECR ion source. The main magnet and acceleration system of DC130 is based on the U200 cyclotron ones that now is under reconstruction. The conceptual design parameters of various systems of the cyclotron and the set of experimental beam lines are presented in this report.
	Poster WEP2PO028 [1.955 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-HB2018-WEP2PO028
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEP2PO033	A Test of Stripper Foil Lifetime in PSI's 72 MeV Proton Beam	detector, cyclotron, beam-losses, TRIUMF	338
	R. Dölling, R. Dressler PSI, Villigen PSI, Switzerland L. Calabretta INFN/LNS, Catania, Italy
	A test of the lifetime of an amorphous carbon foil of ~79 ug/cm² was performed at PSI in the transfer line between Injector 2 and Ring cyclotron during the regularly beam production. The 72 MeV ~1.7 mA proton beam had a central current density of ~2.8 mA/cm². Two spots on the foil were irradiated alternatively with in total three fractions of 17, 52 and 119 mAh. Foil thickness was measured before and after irradiation at several positions via the energy loss of alpha-particles from a 241Am source in the foil. We discuss the observed foil damage as well as the experimental setup, the estimation of the beam parameters and practical boundary conditions.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-HB2018-WEP2PO033
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

target, proton, 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

vacuum, linac, target, 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

target, proton, 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, target, 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)

TUP2WA01

Optical Stochastic Cooling Experiment at the Fermilab IOTA Ring

undulator, optics, electron, experiment

168

J.D. Jarvis, V.A. Lebedev, H. Piekarz, P. Piot, A.L. Romanov, J. Ruan
Fermilab, Batavia, Illinois, USA
M.B. Andorf, P. Piot
Northern Illinois University, DeKalb, Illinois, USA

Funding: Fermi National Accelerator Laboratory is operated by Fermi Research Alliance, LLC under Contract No. DE-AC02-07CH11359 with the United States Department of Energy.
Beam cooling enables an increase of peak and average luminosities and significantly expands the discovery potential of colliders; therefore it is an indispensable component of any modern design. Optical Stochastic Cooling (OSC) is a high-bandwidth, beam-cooling technique that will advance the present state-of-the-art, stochastic cooling rate by more than three orders of magnitude. It is an enabling technology for next-generation, discovery-science machines at the energy and intensity frontiers including hadron and electron-ion colliders. This paper presents the status of our experimental effort to demonstrate OSC at the Integrable Optics Test Accelerator (IOTA) ring, a testbed for advanced beam-physics concepts and technologies that is currently being commissioned at Fermilab. Our recent efforts are centered on the development of an integrated design that is prepared for final engineering and fabrication. The paper also presents a comparison of theoretical calculations and numerical simulations of the pickup-undulator radiation and its interaction with electrons in the kicker-undulator.

Slides TUP2WA01 [20.009 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-HB2018-TUP2WA01

Export •

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

WEP2PO028

Conceptual Design of FLNR JINR Radiation Facility Based on DC130 Cyclotron

cyclotron, extraction, vacuum, experiment

324

N.Yu. Kazarinov, P.Yu. Apel, V. Bashevoy, V. Bekhterev, S.L. Bogomolov, O.N. Borisov, J. Franko, G.G. Gulbekyan, I.A. Ivanenko, I.V. Kalagin, V.I. Mironov, S.V. Mitrofanov, V.A. Semin, V.A. Skuratov, A. Tikhomirov
JINR, Dubna, Moscow Region, Russia

Flerov Laboratory of Nuclear Reaction of Joint Institute for Nuclear Research begins the works under the conceptual design of radiation facility based on the DC130 cyclotron. The facility is intended for SEE testing of microchips, for production of track membranes and for solving of applied physics problems. The DC130 cyclotron will accelerate heavy ions with mass-to-charge ratio A/Z of the range from 5 to 8 up to fixed energies 2 and 4.5 MeV per unit mass. The intensity of the accelerated ions will be about 1 pmcA for lighter ions (A<50) and about 0.1 pmcA for heavier ions (A>50). The injection into cyclotron will be realized from the external DECRIS-SC superconducting ECR ion source. The main magnet and acceleration system of DC130 is based on the U200 cyclotron ones that now is under reconstruction. The conceptual design parameters of various systems of the cyclotron and the set of experimental beam lines are presented in this report.

Poster WEP2PO028 [1.955 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-HB2018-WEP2PO028

Export •

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

WEP2PO033

A Test of Stripper Foil Lifetime in PSI's 72 MeV Proton Beam

detector, cyclotron, beam-losses, TRIUMF

338

R. Dölling, R. Dressler
PSI, Villigen PSI, Switzerland
L. Calabretta
INFN/LNS, Catania, Italy

A test of the lifetime of an amorphous carbon foil of ~79 ug/cm² was performed at PSI in the transfer line between Injector 2 and Ring cyclotron during the regularly beam production. The 72 MeV ~1.7 mA proton beam had a central current density of ~2.8 mA/cm². Two spots on the foil were irradiated alternatively with in total three fractions of 17, 52 and 119 mAh. Foil thickness was measured before and after irradiation at several positions via the energy loss of alpha-particles from a 241Am source in the foil. We discuss the observed foil damage as well as the experimental setup, the estimation of the beam parameters and practical boundary conditions.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-HB2018-WEP2PO033

Export •

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