HB2012 - List of Keywords (neutron)

Paper	Title	Other Keywords	Page
MOP210	Beam Stacking for High Intensity Pulsed Proton Beam with FFAG	acceleration, simulation, extraction, injection	64
	Y. Mori, Y. Ishi, Y. Kuriyama, J.-B. Lagrange, T. Uesugi Kyoto University, Research Reactor Institute, Osaka, Japan
	Multi-beam stacking scheme to generate an intense short-pulsed proton beam with high repetition proton FFAG is presented.

MOP223	Radiation Safety System for PKUNIFTY Project	radiation, shielding, power-supply, controls	112
	J. Zhao, J.E. Chen, Z.Y. Guo, Y.R. Lu, S.X. Peng PKU, Beijing, People's Republic of China J. Zhao, Q.F. Zhou State Key Laboratory of Nuclear Physics and Technology, Beijing, Haidian District, People's Republic of China
	PKUNIFTY (Peking University Neutron Imaging FaciliTY) , which is based on a 2 MeV RFQ accelerator-driven compact neutron sourse with an expected fast-neutron yield of 2.9*1012n/s via the deuteron-beryllium reaction, has been operated this year. A radiation safety system for PKUNIFTY, that protects personnel from radiation hazards has been built and run since last year, is described. It consists of a shielding optimized with Monte-Carlo simulation, a dose interlock system, an alternative interlock with another 4.5MV tandem accelerator facility, and a video monitoring system. The dose of supervision area is less than 0.5μSv/h during beam operation.

TUO1C03	The Beam Diagnostics of CSNS	diagnostics, emittance, linac, injection	302
	T.G. Xu, J.N. Bai, C. Chen, L.X. Han, F. Li, P. Li, M. Meng, J.L. Sun, J.M. Tian, A.X. Wang, B. Wang, M.H. Xu, Zh.H. Xu, X.Y. Yang, L. Zeng IHEP, Beijing, People's Republic of China
	CSNS project is in the construction stage. The overview of CSNS beam diagnostics is presented which includes linac, RCS and both transport beam line. also some predevelopment of CSNS beam diagnostics is presented.
	Slides TUO1C03 [8.366 MB]

TUO3C03	Characterizing and Controlling Beam Losses at the LANSCE Facility	linac, DTL, proton, beam-losses	324
	L. Rybarcyk LANL, Los Alamos, New Mexico, USA
	Funding: Work supported by DOE under contract DE-AC52-06NA25396. The Los Alamos Neutron Science Center (LANSCE) currently provides 100-MeV H⁺ and 800-MeV H⁻ beams to several user facilities that have distinct beam requirements, e.g. intensity, micropulse pattern, duty factor, etc.. Minimizing beam loss is critical to achieving good performance and reliable operation, but can be challenging in the context of simultaneous multi-beam delivery. This presentation will discuss various aspects related to the observation, characterization and minimization of beam loss associated with normal production beam operations.
	Slides TUO3C03 [3.534 MB]

TUO3C04	Beam Loss Mitigation in the Oak Ridge Spallation Neutron Source	quadrupole, linac, DTL, injection	329
	M.A. Plum 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. The Oak Ridge Spallation Neutron Source (SNS) accelerator complex routinely delivers 1 MW of beam power to the spallation target. Due to this high beam power, understanding and minimizing the beam loss is an ongoing focus area of the accelerator physics program. In some areas of the accelerator facility the equipment parameters corresponding to the minimum loss are very different from the design parameters. In this presentation we will summarize the SNS beam loss measurements, the methods used to minimize the beam loss, and a compare the design vs. the loss-minimized equipment parameters.
	Slides TUO3C04 [4.617 MB]

WEO3A03	Extraction, Transport and Collimation of the PSI 1.3 MW Proton Beam	target, proton, extraction, cyclotron	373
	D. Reggiani PSI, Villigen PSI, Switzerland
	With an average operating beam power of 1.3 MW the PSI proton accelerator complex is currently leading the race towards the high intensity frontier of particle accelerators. This talk gives an overview of the extraction of the 590 MeV beam from the ring cyclotron and its low loss transport to the meson production targets M and E as well as to the SINQ spallation neutron source. Particular regard is given to the collimator system reshaping the beam which leaves the 40 mm thick graphite target E before reaching SINQ. Since 2011, up to 8 second long beam macro-pulses are regularly diverted to the new UCN spallation source by means of a fast kicker magnet. The switchover from the SINQ to the UCN beam line as well as the smooth beam transport up to the UCN spallation target constitute the subject of the last part of the talk.
	Slides WEO3A03 [2.728 MB]

WEO3B05	Using Step-Like Nonlinear Magnets for Beam Uniformization at IFMIF Target	target, multipole, octupole, controls	424
	Z. Yang, J.Y. Tang IHEP, Beijing, People's Republic of China N. Chauvin, P.A.P. Nghiem CEA/DSM/IRFU, France
	Uniform beam distribution and minimum beam halo on target are often required in high intensity beam applications to prolong the target lifetime, ease cooling and obtain better irradiation effect. In this report, step-like nonlinear magnets instead of standard multipole magnets have been studied for the application at IFMIF. Although the preliminary results are still below the very critical requirement of spot uniformity at the IFMIF target, they are quite permissive. The method demonstrates significant advantages over the conventional combination of octupole and duodecapole on very low beam loss, better uniformity and very low cost. Further studies are needed to fully meet the IFMIF specifications.
	Slides WEO3B05 [1.487 MB]

WEO3C04	Long Baseline Neutrino Experiment Target Material Radiation Damage Studies Using Energetic Protons of the Brookhaven Linear Isotope Production (BLIP) Facility	proton, target, lattice, radiation	471
	N. Simos BNL, Upton, Long Island, New York, USA P. Hurh Fermilab, Batavia, USA Z. Kotsina NCSR Demokritos, Attiki, Greece
	One of the future multi-MW accelerators is the LBNE Experiment where Fermilab plans to produce a beam of neutrinos with a 2.3 MW proton beam as part of a suite of experiments associated with ProjectX. Specifically, the LBNE Neutrino Beam Facility aims for a 2⁺ MW, 60-120 GeV pulsed,high intensity proton beam produced in the ProjectX accelerator intercepted by a low Z solid target to facilitate the production of low energy neutrinos. The multi-MW level LBNE proton beam will be characterized by intensities of the order of 1.6·10⁺¹⁴ p/pulse, σ_radius of 1.5-3.5 mm and a 9.8 μs pulse length. These parameters are expected to push many target materials to their limit thus making the target design very challenging. Recent experience from operating high intensity beams on targets have indicated that several critical design issues exist namely thermal shock,heat removal, radiation damage,radiation accelerated corrosion effects,and residual radiation within the target envelope. A series of experimental studies on radiation damage and thermal shock response conducted at BNL and focusing on low-Z materials have unraveled potential issues regarding the damageability from energetic particle beams which may differ significantly from thermal reactor experience. Irradiation damage results for low-Z materials associated with the LBNE and other high power experiments will be presented.
	Slides WEO3C04 [3.965 MB]

THO1C01	High Intensity Operation and Control of Beam Losses in a Cyclotron Based Accelerator	cyclotron, target, extraction, proton	555
	M. Seidel, J. Grillenberger, A.C. Mezger PSI, Villigen PSI, Switzerland
	This presentation discusses aspects of high intensity operation in PSI's cyclotron based proton accelerator (HIPA). Major beam loss mechanisms and tuning methods to minimize losses are presented. Concept and optimization of low loss beam extraction from a cyclotron are described. Collimators are used to localize beam losses and activation. Activation levels of accelerator components are shown. An overview on instrumentation for loss monitoring and prevention of failure situations is given. Other relevant aspects include the beam trip statistics and grid to beam power conversion efficiency.
	Slides THO1C01 [3.642 MB]

THO3C04	Longitudinal Beam Diagnosis with RF Chopper System	cavity, linac, acceleration, DTL	591
	T. Maruta JAEA/J-PARC, Tokai-mura, Japan M. Ikegami KEK, Ibaraki, Japan
	J-PARC linac has a chopper system between RFQ and DTL, which utilizes an RF deflector cavity instead of a usual slow wave kicker. Taking advantage of this unique feature of the chopper system, we have experimentally measured the longitudinal full width of phase direction at the chopper cavity. In this presentation, I would like to discuss the measurement technique and measurement results.
	Slides THO3C04 [2.495 MB]

Paper

Title

Other Keywords

Page

MOP210

Beam Stacking for High Intensity Pulsed Proton Beam with FFAG

acceleration, simulation, extraction, injection

64

Y. Mori, Y. Ishi, Y. Kuriyama, J.-B. Lagrange, T. Uesugi
Kyoto University, Research Reactor Institute, Osaka, Japan

Multi-beam stacking scheme to generate an intense short-pulsed proton beam with high repetition proton FFAG is presented.

MOP223

Radiation Safety System for PKUNIFTY Project

radiation, shielding, power-supply, controls

112

J. Zhao, J.E. Chen, Z.Y. Guo, Y.R. Lu, S.X. Peng
PKU, Beijing, People's Republic of China
J. Zhao, Q.F. Zhou
State Key Laboratory of Nuclear Physics and Technology, Beijing, Haidian District, People's Republic of China

PKUNIFTY (Peking University Neutron Imaging FaciliTY) , which is based on a 2 MeV RFQ accelerator-driven compact neutron sourse with an expected fast-neutron yield of 2.9*1012n/s via the deuteron-beryllium reaction, has been operated this year. A radiation safety system for PKUNIFTY, that protects personnel from radiation hazards has been built and run since last year, is described. It consists of a shielding optimized with Monte-Carlo simulation, a dose interlock system, an alternative interlock with another 4.5MV tandem accelerator facility, and a video monitoring system. The dose of supervision area is less than 0.5μSv/h during beam operation.

TUO1C03

The Beam Diagnostics of CSNS

diagnostics, emittance, linac, injection

302

T.G. Xu, J.N. Bai, C. Chen, L.X. Han, F. Li, P. Li, M. Meng, J.L. Sun, J.M. Tian, A.X. Wang, B. Wang, M.H. Xu, Zh.H. Xu, X.Y. Yang, L. Zeng
IHEP, Beijing, People's Republic of China

CSNS project is in the construction stage. The overview of CSNS beam diagnostics is presented which includes linac, RCS and both transport beam line. also some predevelopment of CSNS beam diagnostics is presented.

Slides TUO1C03 [8.366 MB]

TUO3C03

Characterizing and Controlling Beam Losses at the LANSCE Facility

linac, DTL, proton, beam-losses

324

L. Rybarcyk
LANL, Los Alamos, New Mexico, USA

Funding: Work supported by DOE under contract DE-AC52-06NA25396.
The Los Alamos Neutron Science Center (LANSCE) currently provides 100-MeV H⁺ and 800-MeV H⁻ beams to several user facilities that have distinct beam requirements, e.g. intensity, micropulse pattern, duty factor, etc.. Minimizing beam loss is critical to achieving good performance and reliable operation, but can be challenging in the context of simultaneous multi-beam delivery. This presentation will discuss various aspects related to the observation, characterization and minimization of beam loss associated with normal production beam operations.

Slides TUO3C03 [3.534 MB]

TUO3C04

Beam Loss Mitigation in the Oak Ridge Spallation Neutron Source

quadrupole, linac, DTL, injection

329

M.A. Plum
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.
The Oak Ridge Spallation Neutron Source (SNS) accelerator complex routinely delivers 1 MW of beam power to the spallation target. Due to this high beam power, understanding and minimizing the beam loss is an ongoing focus area of the accelerator physics program. In some areas of the accelerator facility the equipment parameters corresponding to the minimum loss are very different from the design parameters. In this presentation we will summarize the SNS beam loss measurements, the methods used to minimize the beam loss, and a compare the design vs. the loss-minimized equipment parameters.

Slides TUO3C04 [4.617 MB]

WEO3A03

Extraction, Transport and Collimation of the PSI 1.3 MW Proton Beam

target, proton, extraction, cyclotron

373

D. Reggiani
PSI, Villigen PSI, Switzerland

With an average operating beam power of 1.3 MW the PSI proton accelerator complex is currently leading the race towards the high intensity frontier of particle accelerators. This talk gives an overview of the extraction of the 590 MeV beam from the ring cyclotron and its low loss transport to the meson production targets M and E as well as to the SINQ spallation neutron source. Particular regard is given to the collimator system reshaping the beam which leaves the 40 mm thick graphite target E before reaching SINQ. Since 2011, up to 8 second long beam macro-pulses are regularly diverted to the new UCN spallation source by means of a fast kicker magnet. The switchover from the SINQ to the UCN beam line as well as the smooth beam transport up to the UCN spallation target constitute the subject of the last part of the talk.

Slides WEO3A03 [2.728 MB]

WEO3B05

Using Step-Like Nonlinear Magnets for Beam Uniformization at IFMIF Target

target, multipole, octupole, controls

424

Z. Yang, J.Y. Tang
IHEP, Beijing, People's Republic of China
N. Chauvin, P.A.P. Nghiem
CEA/DSM/IRFU, France

Uniform beam distribution and minimum beam halo on target are often required in high intensity beam applications to prolong the target lifetime, ease cooling and obtain better irradiation effect. In this report, step-like nonlinear magnets instead of standard multipole magnets have been studied for the application at IFMIF. Although the preliminary results are still below the very critical requirement of spot uniformity at the IFMIF target, they are quite permissive. The method demonstrates significant advantages over the conventional combination of octupole and duodecapole on very low beam loss, better uniformity and very low cost. Further studies are needed to fully meet the IFMIF specifications.

Slides WEO3B05 [1.487 MB]

WEO3C04

Long Baseline Neutrino Experiment Target Material Radiation Damage Studies Using Energetic Protons of the Brookhaven Linear Isotope Production (BLIP) Facility

proton, target, lattice, radiation

471

N. Simos
BNL, Upton, Long Island, New York, USA
P. Hurh
Fermilab, Batavia, USA
Z. Kotsina
NCSR Demokritos, Attiki, Greece

One of the future multi-MW accelerators is the LBNE Experiment where Fermilab plans to produce a beam of neutrinos with a 2.3 MW proton beam as part of a suite of experiments associated with ProjectX. Specifically, the LBNE Neutrino Beam Facility aims for a 2⁺ MW, 60-120 GeV pulsed,high intensity proton beam produced in the ProjectX accelerator intercepted by a low Z solid target to facilitate the production of low energy neutrinos. The multi-MW level LBNE proton beam will be characterized by intensities of the order of 1.6·10⁺¹⁴ p/pulse, σ_radius of 1.5-3.5 mm and a 9.8 μs pulse length. These parameters are expected to push many target materials to their limit thus making the target design very challenging. Recent experience from operating high intensity beams on targets have indicated that several critical design issues exist namely thermal shock,heat removal, radiation damage,radiation accelerated corrosion effects,and residual radiation within the target envelope. A series of experimental studies on radiation damage and thermal shock response conducted at BNL and focusing on low-Z materials have unraveled potential issues regarding the damageability from energetic particle beams which may differ significantly from thermal reactor experience. Irradiation damage results for low-Z materials associated with the LBNE and other high power experiments will be presented.

Slides WEO3C04 [3.965 MB]

THO1C01

High Intensity Operation and Control of Beam Losses in a Cyclotron Based Accelerator

cyclotron, target, extraction, proton

555

M. Seidel, J. Grillenberger, A.C. Mezger
PSI, Villigen PSI, Switzerland

This presentation discusses aspects of high intensity operation in PSI's cyclotron based proton accelerator (HIPA). Major beam loss mechanisms and tuning methods to minimize losses are presented. Concept and optimization of low loss beam extraction from a cyclotron are described. Collimators are used to localize beam losses and activation. Activation levels of accelerator components are shown. An overview on instrumentation for loss monitoring and prevention of failure situations is given. Other relevant aspects include the beam trip statistics and grid to beam power conversion efficiency.

Slides THO1C01 [3.642 MB]

THO3C04

Longitudinal Beam Diagnosis with RF Chopper System

cavity, linac, acceleration, DTL

591

T. Maruta
JAEA/J-PARC, Tokai-mura, Japan
M. Ikegami
KEK, Ibaraki, Japan

J-PARC linac has a chopper system between RFQ and DTL, which utilizes an RF deflector cavity instead of a usual slow wave kicker. Taking advantage of this unique feature of the chopper system, we have experimentally measured the longitudinal full width of phase direction at the chopper cavity. In this presentation, I would like to discuss the measurement technique and measurement results.

Slides THO3C04 [2.495 MB]