IPAC2017 - Classification: 07 Accelerator Technology / T20 Targetry

Paper	Title	Page
WEOCB3	The Radiation Damage in Accelerator Target Environments (RaDIATE) Collaboration R&D Program - Status and Future Activities	2550
	P. Hurh Fermilab, Batavia, Illinois, USA
	Funding: Work supported by Fermi Research Alliance, LLC, under Contract No. DE-AC02-07CH11359 with the U.S. Department of Energy. The RaDIATE collaboration (Radiation Damage In Accelerator Target Environments), founded in 2012, has grown to over 50 participants and 14 institutions globally. The primary objective is to harness existing expertise in nuclear materials and accelerator targets to generate new and useful materials data for application within the accelerator and fission/fusion communities. Current activities include post-irradiation examination of materials taken from existing beamlines (such as the NuMI beryllium primary beam window and graphite target fins from Fermilab) as well as new irradiations of candidate target materials at low energy and high energy beam facilities (such as titanium and aluminum alloys, glassy carbon, TZM and tungsten). In addition, the program includes thermal shock experiments utilizing high intensity proton beam pulses available at the HiRadMat facility at CERN. Status of current RaDIATE activities as well as future plans will be discussed, including highlights of preliminary results from various ongoing RaDIATE activities and the high level plan to explore the high-power accelerator target relevant thermal shock and radiation damage parameter space.
	Slides WEOCB3 [10.635 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEOCB3
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WEPAB127	EMuS Target Station Studies	2871
	N. Vassilopoulos, Z.L. Hou, Y. Yuan, G. Zhao IHEP, Beijing, People's Republic of China
	The experimental muon source (EMuS) is a high-intensity muon source at China Spallation Neutron Source (CSNS), aiming to combine muSR applications, R&D efforts for a future muon-decay based neutrino beam, and neutrino cross-section measurements. The proton beam has 4 kW of power and is provided by the rapid cycling synchrotron (RCS) of CSNS to a capture system that consists of an adiabatic superconductive solenoid with a maximum field of 5 T and a graphite target located inside the first coil, in order to maximize muons/pions capture and reduce their transverse momentum. In this article we present the challenging target system and the optimization studies that led to the current 4-coil/3-step design. The challenge arises from the necessary extraction of the spent proton beam along the downstream area of the capture solenoid through a hole, in order to separate it from the muons and pions. In addition, shielding studies are presented in order to examine the effectiveness of the shields on the coils and the low radiation damage expected in the system.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPAB127
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WEPIK120	Simulated performance of the Production Target for the Muon g-2 Experiment at Fermilab	3234
	D. Stratakis, M.E. Convery, J.P. Morgan, D.A. Still, M.J. Syphers Fermilab, Batavia, Illinois, USA M.J. Syphers Northern Illinois University, DeKalb, Illinois, USA V. Tishchenko BNL, Upton, Long Island, New York, USA
	Funding: Operated by Fermi Research Alliance, LLC under Contract No. De-AC02-07CH11359 with the United States Department of Energy. The Muon g-2 Experiment plans to use the Fermilab Recycler Ring for forming the proton bunches that hit its production target. The proposed scheme uses one RF system, 80 kV of 2.5 MHz RF. In order to avoid bunch rotations in a mismatched bucket, the 2.5 MHz is ramped adiabatically from 3 to 80 kV in 90 ms. In this study, the interaction of the primary proton beam with the production target for the Muon g-2 Experiment is numerically examined.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPIK120
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WEPVA066	The ESS Target Proton Beam Imaging System as in-Kind Contribution	3422
	E. Adli, R. Andersson, D.M. Bang, O. Dorholt, H. Gjersdal, O.M. Røhne University of Oslo, Oslo, Norway M.G. Ibison, C.P. Welsch The University of Liverpool, Liverpool, United Kingdom S. Joshi University College West, Trollhätan, Sweden T.J. Shea, C.A. Thomas ESS, Lund, Sweden
	Funding: This work is part of the Norwegian in-kind contribution to ESS. The ESS Target Proton Beam Imaging System will image the 5 MW ESS proton beam as it enters the spallation target. The system will operate in a harsh radiation environment, leading to a number of challenges: development of radiation hard photon sources, long aperture-restricted optical paths, and fast electronics to provide rapid response to beam anomalies. The newly formed accelerator group at the University of Oslo is the in-kind partner for the Imaging System. This paper outlines the main challenges of the Imaging System and how they are addressed within the collaborative nature of the in-kind project.
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WEPVA102	Design of the New CERN n_TOF Neutron Spallation Target: R&D and Prototyping Activities	3503
SUSPSIK112	use link to see paper's listing under its alternate paper code
	R. Esposito, M. Calviani, T. Coiffet, M. Delonca, L. Dufay-Chanat, E. Gallay, M. Guinchard, D. Horvath, T. Koettig, A.P. Perez, A.T. Perez Fontenla, A. Perillo-Marcone, S. Sgobba, M.A. Timmins, A. Vacca, V. Vlachoudis CERN, Geneva, Switzerland M. Beregret UTBM, Belfort, France L. Gomez Pereira University of Vigo, Pontevedra, Spain F. Latini University of Rome La Sapienza, Rome, Italy R. Logé EPFL, Lausanne, Switzerland
	A new spallation target for the CERN neutron time-of-flight facility will be installed during Long Shutdown 2 (2019-2020), with the objective of improving operational reliability, avoiding water contamination of spallation products, corrosion/erosion and creep phenomena, as well as optimizing it for the 20 m distant vertical experimental area 2, whilst keeping the same physics performances of the current target at the 200 m far experimental area 1. Several solutions have been studied with FLUKA Monte Carlo simulations in order to find the optimal solution with respect to neutron fluence, photon background, resolution function, energy deposition and radiation damage. Thermo-mechanical studies (including CFD simulations) have been performed in order to evaluate and optimize the target ability to withstand the beam loads in terms of maximum temperatures reached, cooling system efficiency, maximum stresses, creep and fatigue behaviour of the target materials, leading to a preliminary mechanical design of the target. This paper also covers the further prototyping and material characterization activities carried out in order to validate the feasibility of the investigated solutions.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPVA102
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WEPVA103	Renovation of CERN Antiproton Production Target Area and Associated Design, Testing and R&D Activities	3506
	C. Torregrosa, M.E.J. Butcher, M. Calviani, A. De Macedo, S. De Man, R. Ferriere, E. Grenier-Boley, B. Lefort, E. Lopez Sola, A. Perillo-Marcone, M.A. Timmins CERN, Geneva, Switzerland
	In the Antiproton Decelerator (AD) Target Area antiprotons are produced by the collisions of 26 GeV/c proton beam with a fixed target. They are then collected by a 400 kA pulsed magnetic horn, momentum selected and injected into the AD facility. The area has been in operation since the 80s, keeping most of the equipment dating back to this period. A major upgrade is foreseen during the CERN's Long Shutdown 2 to guarantee the next decades of antiproton physics. Among other R&D activities, three main systems are within the scope of this upgrade; (i) a new antiproton target design, pressurized-air-cooled and with a new core configuration based on the results from the HiRadMat27 experiment. (ii) Manufacturing of a set of new magnetic horns and testing them using a dedicated test bench replicating the real horn setup. (iii) Design of new target and horn's trolleys, which are responsible for their positioning as well as providing an efficient long term maintenance giving the high radioactivity of the area. This paper presents an overview of these and other critical activities associated to the renovation of the target area, including status and direction of the new proposed designs.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPVA103
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WEPVA109	Design of the New PS Internal Dumps, in the Framework of the LHC Injector Upgrade (LIU) Project	3521
	G. Romagnoli, J.A. Briz Monago, M. Calviani, J.J. Esala, E. Grenier-Boley, A. Masi, F.-X. Nuiry, A. Perillo-Marcone, T. Polzin, V. Vlachoudis CERN, Geneva, Switzerland
	For the LHC injectors upgrade (LIU) at CERN, the two PS (Proton Synchrotron) dumps will be redesigned and upgraded for the new high intensity beams. The EN-STI group is in charge of the design and installation of the new dumps, foreseen for the next CERN's Long Shutdown in 2019-2020. As internal dumps, the PS dumps have been installed in 1975 directly in the PS vacuum ring between the main bending magnets and they are operating since then. The dumps enter the beam line when requested by beam operation, with a 6 kg Cu block moved quickly with a spring-based mechanism. This Cu block is not expected to survive the impact of the future beams. A new design is presented for the dump core based on FLUKA-ANSYS coupled simulations. The dumps should work with any PS beam foreseen within LIU, be water cooled in ultra-high vacuum medium, and enter the beam chamber in less than 250 ms. The dump should be used 200000 times per year, with a lifetime of 20 years, with almost zero maintenance. The new challenging design is based on an oscillating thin blade shaving turn after turn the circulating beam. The material considered for the blade are Cu, Ti or CuCrZr with embedded cooling channels.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPVA109
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WEPVA110	Analysis and Operational Feedback on the New Design of the High Energy Beam Dump in the CERN SPS	3524
	P. Rios Rodriguez, J.A. Briz Monago, M. Calviani, K. Cornelis, S. De Man, R. Esposito, S.S. Gilardoni, B. Goddard, J.L. Grenard, D. Grenier, M. Grieco, J. Humbert, V. Kain, F.M. Leaux, C. Pasquino, A. Perillo-Marcone, J.R.F. Poujol, S. Sgobba, D. Steyart, F.M. Velotti, V. Vlachoudis CERN, Geneva, Switzerland
	CERN's Super Proton Synchrotron (SPS) high-energy internal dump (Target Internal Dump Vertical Graphite, known as TIDVG) is required to intercept beams from 10² to 450 GeV. The equipment installed in 2014 (TIDVG#3) featured an absorbing core composed of different materials surrounded by a water-cooled copper jacket, which hold the UHV of the machine. An inspection of a previous equipment (TIDVG#2) in 2013 revealed significant beam induced damage to the aluminium section of the dump, which required imposing operational limitations to minimise the risk of reproducing this phenomenon. Additionally, in 2016 a vacuum leak was detected in the dump assembly, which imposed further limitations, i.e. a reduction of the beam intensity that could be dumped per SPS supercycle. This paper presents a new design (TIDVG#4), which focuses on improving the operational robustness of the device. Moreover, thanks to the added instrumentation, a careful analysis of its performance (both experimentally and during operation) will be possible. These studies will help validating technical solutions for the design of the future SPS dump to be installed during CERN's Long Shutdown 2 in 2020 (TIDVG#5).
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WEPVA138	The RaDIATE High-Energy Proton Materials Irradiation Experiment at the Brookhaven Linac Isotope Producer Facility	3593
	K. Ammigan, P. Hurh, R.M. Zwaska Fermilab, Batavia, Illinois, USA A. Amroussia, C.J. Boehlert Michigan State University, East Lansing, Michigan, USA M.S. Avilov, F. Pellemoine FRIB, East Lansing, USA M. Calviani, E. Fornasiere, A. Perillo-Marcone, C. Torregrosa CERN, Geneva, Switzerland A.M. Casella, D.J. Senor PNNL, Richland, Washington, USA C.J. Densham STFC/RAL, Chilton, Didcot, Oxon, United Kingdom T. Ishida, S. Makimura KEK, Ibaraki, Japan V.I. Kuksenko, S.G. Roberts University of Oxford, Oxford, United Kingdom Y. Lee, T.J. Shea, C.A. Thomas ESS, Lund, Sweden L.F. Mausner, D. Medvedev, N. Simos BNL, Upton, Long Island, New York, USA E. Wakai KEK/JAEA, Ibaraki-Ken, Japan
	Funding: Work supported by Fermi Research Alliance, LLC, under Contract No. DE-AC02-07CH11359 with the U.S. Department of Energy. The RaDIATE collaboration (Radiation Damage In Accelerator Target Environments) was founded in 2012 to bring together the high-energy accelerator target and nuclear materials communities to address the challenging issue of radiation damage effects in beam-intercepting materials. Success of current and future high intensity accelerator target facilities requires a fundamental understanding of these effects including measurement of materials property data. Toward this goal, the RaDIATE collaboration organized and carried out a materials irradiation run at the Brookhaven Linac Isotope Producer facility (BLIP). The experiment utilized a 181 MeV proton beam to irradiate several capsules, each containing many candidate material samples for various accelerator components. Materials included various grades/alloys of beryllium, graphite, silicon, iridium, titanium, TZM, CuCrZr, and aluminum. Attainable peak damage from an 8-week irradiation run ranges from 0.03 DPA (Be) to 7 DPA (Ir). Helium production is expected to range from 5 appm/DPA (Ir) to 3,000 appm/DPA (Be). The motivation, experimental parameters, as well as the post-irradiation examination plans of this experiment are described.
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WEPVA148	Dynamics of Target Motion Under Exposure of Hard Gamma Undulator Radiation	3618
	A.A. Mikhailichenko Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA
	We describe time dependent dynamics of the target motion under exposure by undulator radiation in a system for positron production. We took into account inertia of material of target. Calculations carried with help of FlexPDE code.
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Paper

Title

Page

The Radiation Damage in Accelerator Target Environments (RaDIATE) Collaboration R&D Program - Status and Future Activities

2550

P. Hurh
Fermilab, Batavia, Illinois, USA

Funding: Work supported by Fermi Research Alliance, LLC, under Contract No. DE-AC02-07CH11359 with the U.S. Department of Energy.
The RaDIATE collaboration (Radiation Damage In Accelerator Target Environments), founded in 2012, has grown to over 50 participants and 14 institutions globally. The primary objective is to harness existing expertise in nuclear materials and accelerator targets to generate new and useful materials data for application within the accelerator and fission/fusion communities. Current activities include post-irradiation examination of materials taken from existing beamlines (such as the NuMI beryllium primary beam window and graphite target fins from Fermilab) as well as new irradiations of candidate target materials at low energy and high energy beam facilities (such as titanium and aluminum alloys, glassy carbon, TZM and tungsten). In addition, the program includes thermal shock experiments utilizing high intensity proton beam pulses available at the HiRadMat facility at CERN. Status of current RaDIATE activities as well as future plans will be discussed, including highlights of preliminary results from various ongoing RaDIATE activities and the high level plan to explore the high-power accelerator target relevant thermal shock and radiation damage parameter space.

Slides WEOCB3 [10.635 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEOCB3

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WEPAB127

EMuS Target Station Studies

2871

N. Vassilopoulos, Z.L. Hou, Y. Yuan, G. Zhao
IHEP, Beijing, People's Republic of China

The experimental muon source (EMuS) is a high-intensity muon source at China Spallation Neutron Source (CSNS), aiming to combine muSR applications, R&D efforts for a future muon-decay based neutrino beam, and neutrino cross-section measurements. The proton beam has 4 kW of power and is provided by the rapid cycling synchrotron (RCS) of CSNS to a capture system that consists of an adiabatic superconductive solenoid with a maximum field of 5 T and a graphite target located inside the first coil, in order to maximize muons/pions capture and reduce their transverse momentum. In this article we present the challenging target system and the optimization studies that led to the current 4-coil/3-step design. The challenge arises from the necessary extraction of the spent proton beam along the downstream area of the capture solenoid through a hole, in order to separate it from the muons and pions. In addition, shielding studies are presented in order to examine the effectiveness of the shields on the coils and the low radiation damage expected in the system.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPAB127

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WEPIK120

Simulated performance of the Production Target for the Muon g-2 Experiment at Fermilab

3234

D. Stratakis, M.E. Convery, J.P. Morgan, D.A. Still, M.J. Syphers
Fermilab, Batavia, Illinois, USA
M.J. Syphers
Northern Illinois University, DeKalb, Illinois, USA
V. Tishchenko
BNL, Upton, Long Island, New York, USA

Funding: Operated by Fermi Research Alliance, LLC under Contract No. De-AC02-07CH11359 with the United States Department of Energy.
The Muon g-2 Experiment plans to use the Fermilab Recycler Ring for forming the proton bunches that hit its production target. The proposed scheme uses one RF system, 80 kV of 2.5 MHz RF. In order to avoid bunch rotations in a mismatched bucket, the 2.5 MHz is ramped adiabatically from 3 to 80 kV in 90 ms. In this study, the interaction of the primary proton beam with the production target for the Muon g-2 Experiment is numerically examined.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPIK120

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WEPVA066

The ESS Target Proton Beam Imaging System as in-Kind Contribution

3422

E. Adli, R. Andersson, D.M. Bang, O. Dorholt, H. Gjersdal, O.M. Røhne
University of Oslo, Oslo, Norway
M.G. Ibison, C.P. Welsch
The University of Liverpool, Liverpool, United Kingdom
S. Joshi
University College West, Trollhätan, Sweden
T.J. Shea, C.A. Thomas
ESS, Lund, Sweden

Funding: This work is part of the Norwegian in-kind contribution to ESS.
The ESS Target Proton Beam Imaging System will image the 5 MW ESS proton beam as it enters the spallation target. The system will operate in a harsh radiation environment, leading to a number of challenges: development of radiation hard photon sources, long aperture-restricted optical paths, and fast electronics to provide rapid response to beam anomalies. The newly formed accelerator group at the University of Oslo is the in-kind partner for the Imaging System. This paper outlines the main challenges of the Imaging System and how they are addressed within the collaborative nature of the in-kind project.

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WEPVA102

Design of the New CERN n_TOF Neutron Spallation Target: R&D and Prototyping Activities

3503

SUSPSIK112

use link to see paper's listing under its alternate paper code

R. Esposito, M. Calviani, T. Coiffet, M. Delonca, L. Dufay-Chanat, E. Gallay, M. Guinchard, D. Horvath, T. Koettig, A.P. Perez, A.T. Perez Fontenla, A. Perillo-Marcone, S. Sgobba, M.A. Timmins, A. Vacca, V. Vlachoudis
CERN, Geneva, Switzerland
M. Beregret
UTBM, Belfort, France
L. Gomez Pereira
University of Vigo, Pontevedra, Spain
F. Latini
University of Rome La Sapienza, Rome, Italy
R. Logé
EPFL, Lausanne, Switzerland

A new spallation target for the CERN neutron time-of-flight facility will be installed during Long Shutdown 2 (2019-2020), with the objective of improving operational reliability, avoiding water contamination of spallation products, corrosion/erosion and creep phenomena, as well as optimizing it for the 20 m distant vertical experimental area 2, whilst keeping the same physics performances of the current target at the 200 m far experimental area 1. Several solutions have been studied with FLUKA Monte Carlo simulations in order to find the optimal solution with respect to neutron fluence, photon background, resolution function, energy deposition and radiation damage. Thermo-mechanical studies (including CFD simulations) have been performed in order to evaluate and optimize the target ability to withstand the beam loads in terms of maximum temperatures reached, cooling system efficiency, maximum stresses, creep and fatigue behaviour of the target materials, leading to a preliminary mechanical design of the target. This paper also covers the further prototyping and material characterization activities carried out in order to validate the feasibility of the investigated solutions.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPVA102

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WEPVA103

Renovation of CERN Antiproton Production Target Area and Associated Design, Testing and R&D Activities

3506

C. Torregrosa, M.E.J. Butcher, M. Calviani, A. De Macedo, S. De Man, R. Ferriere, E. Grenier-Boley, B. Lefort, E. Lopez Sola, A. Perillo-Marcone, M.A. Timmins
CERN, Geneva, Switzerland

In the Antiproton Decelerator (AD) Target Area antiprotons are produced by the collisions of 26 GeV/c proton beam with a fixed target. They are then collected by a 400 kA pulsed magnetic horn, momentum selected and injected into the AD facility. The area has been in operation since the 80s, keeping most of the equipment dating back to this period. A major upgrade is foreseen during the CERN's Long Shutdown 2 to guarantee the next decades of antiproton physics. Among other R&D activities, three main systems are within the scope of this upgrade; (i) a new antiproton target design, pressurized-air-cooled and with a new core configuration based on the results from the HiRadMat27 experiment. (ii) Manufacturing of a set of new magnetic horns and testing them using a dedicated test bench replicating the real horn setup. (iii) Design of new target and horn's trolleys, which are responsible for their positioning as well as providing an efficient long term maintenance giving the high radioactivity of the area. This paper presents an overview of these and other critical activities associated to the renovation of the target area, including status and direction of the new proposed designs.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPVA103

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WEPVA109

Design of the New PS Internal Dumps, in the Framework of the LHC Injector Upgrade (LIU) Project

3521

G. Romagnoli, J.A. Briz Monago, M. Calviani, J.J. Esala, E. Grenier-Boley, A. Masi, F.-X. Nuiry, A. Perillo-Marcone, T. Polzin, V. Vlachoudis
CERN, Geneva, Switzerland

For the LHC injectors upgrade (LIU) at CERN, the two PS (Proton Synchrotron) dumps will be redesigned and upgraded for the new high intensity beams. The EN-STI group is in charge of the design and installation of the new dumps, foreseen for the next CERN's Long Shutdown in 2019-2020. As internal dumps, the PS dumps have been installed in 1975 directly in the PS vacuum ring between the main bending magnets and they are operating since then. The dumps enter the beam line when requested by beam operation, with a 6 kg Cu block moved quickly with a spring-based mechanism. This Cu block is not expected to survive the impact of the future beams. A new design is presented for the dump core based on FLUKA-ANSYS coupled simulations. The dumps should work with any PS beam foreseen within LIU, be water cooled in ultra-high vacuum medium, and enter the beam chamber in less than 250 ms. The dump should be used 200000 times per year, with a lifetime of 20 years, with almost zero maintenance. The new challenging design is based on an oscillating thin blade shaving turn after turn the circulating beam. The material considered for the blade are Cu, Ti or CuCrZr with embedded cooling channels.

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WEPVA110

Analysis and Operational Feedback on the New Design of the High Energy Beam Dump in the CERN SPS

3524

P. Rios Rodriguez, J.A. Briz Monago, M. Calviani, K. Cornelis, S. De Man, R. Esposito, S.S. Gilardoni, B. Goddard, J.L. Grenard, D. Grenier, M. Grieco, J. Humbert, V. Kain, F.M. Leaux, C. Pasquino, A. Perillo-Marcone, J.R.F. Poujol, S. Sgobba, D. Steyart, F.M. Velotti, V. Vlachoudis
CERN, Geneva, Switzerland

CERN's Super Proton Synchrotron (SPS) high-energy internal dump (Target Internal Dump Vertical Graphite, known as TIDVG) is required to intercept beams from 10² to 450 GeV. The equipment installed in 2014 (TIDVG#3) featured an absorbing core composed of different materials surrounded by a water-cooled copper jacket, which hold the UHV of the machine. An inspection of a previous equipment (TIDVG#2) in 2013 revealed significant beam induced damage to the aluminium section of the dump, which required imposing operational limitations to minimise the risk of reproducing this phenomenon. Additionally, in 2016 a vacuum leak was detected in the dump assembly, which imposed further limitations, i.e. a reduction of the beam intensity that could be dumped per SPS supercycle. This paper presents a new design (TIDVG#4), which focuses on improving the operational robustness of the device. Moreover, thanks to the added instrumentation, a careful analysis of its performance (both experimentally and during operation) will be possible. These studies will help validating technical solutions for the design of the future SPS dump to be installed during CERN's Long Shutdown 2 in 2020 (TIDVG#5).

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WEPVA138

The RaDIATE High-Energy Proton Materials Irradiation Experiment at the Brookhaven Linac Isotope Producer Facility

3593

K. Ammigan, P. Hurh, R.M. Zwaska
Fermilab, Batavia, Illinois, USA
A. Amroussia, C.J. Boehlert
Michigan State University, East Lansing, Michigan, USA
M.S. Avilov, F. Pellemoine
FRIB, East Lansing, USA
M. Calviani, E. Fornasiere, A. Perillo-Marcone, C. Torregrosa
CERN, Geneva, Switzerland
A.M. Casella, D.J. Senor
PNNL, Richland, Washington, USA
C.J. Densham
STFC/RAL, Chilton, Didcot, Oxon, United Kingdom
T. Ishida, S. Makimura
KEK, Ibaraki, Japan
V.I. Kuksenko, S.G. Roberts
University of Oxford, Oxford, United Kingdom
Y. Lee, T.J. Shea, C.A. Thomas
ESS, Lund, Sweden
L.F. Mausner, D. Medvedev, N. Simos
BNL, Upton, Long Island, New York, USA
E. Wakai
KEK/JAEA, Ibaraki-Ken, Japan

Funding: Work supported by Fermi Research Alliance, LLC, under Contract No. DE-AC02-07CH11359 with the U.S. Department of Energy.
The RaDIATE collaboration (Radiation Damage In Accelerator Target Environments) was founded in 2012 to bring together the high-energy accelerator target and nuclear materials communities to address the challenging issue of radiation damage effects in beam-intercepting materials. Success of current and future high intensity accelerator target facilities requires a fundamental understanding of these effects including measurement of materials property data. Toward this goal, the RaDIATE collaboration organized and carried out a materials irradiation run at the Brookhaven Linac Isotope Producer facility (BLIP). The experiment utilized a 181 MeV proton beam to irradiate several capsules, each containing many candidate material samples for various accelerator components. Materials included various grades/alloys of beryllium, graphite, silicon, iridium, titanium, TZM, CuCrZr, and aluminum. Attainable peak damage from an 8-week irradiation run ranges from 0.03 DPA (Be) to 7 DPA (Ir). Helium production is expected to range from 5 appm/DPA (Ir) to 3,000 appm/DPA (Be). The motivation, experimental parameters, as well as the post-irradiation examination plans of this experiment are described.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPVA138

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WEPVA148

Dynamics of Target Motion Under Exposure of Hard Gamma Undulator Radiation

3618

A.A. Mikhailichenko
Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA

We describe time dependent dynamics of the target motion under exposure by undulator radiation in a system for positron production. We took into account inertia of material of target. Calculations carried with help of FlexPDE code.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPVA148

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