IPAC2015 - List of Keywords (beam-transport)

Paper	Title	Other Keywords	Page
MOPWA045	First Tests of a Beam Transport System from a Laser Wakefield Accelerator to a Transverse Gradient Undulator	electron, quadrupole, undulator, dipole	216
	C. Widmann, V. Afonso Rodríguez, A. Bernhard, A.-S. Müller, R. Rossmanith, W. Werner KIT, Karlsruhe, Germany M. Kaluza, M. Nicolai, M.B. Schwab, A. Sävert IOQ, Jena, Germany M. Kaluza, S. Kuschel HIJ, Jena, Germany
	An experimental setup for the generation of monochromatic undulator radiation at the laser wakefield accelerator (LWFA) in Jena using a transverse gradient undulator (TGU) is planned. Proper matching of the betatron functions and the dispersion of the electron beam to the undulator is essential. Therefor a beam transport system with strong focusing magnets and chromatic correction of these magnets is required. As a first step, a linear beam transport system without chromatic correction was assembled at the LWFA. With this setup the electron beam’s dispersion and the beta function of one selected energy are matched to the required parameters at the TGU. This contribution presents the experimental results of these measurements.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-MOPWA045
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MOPMA045	Conceptual Difficulties of a Thermodynamics Description of Charged-Particle Beams	emittance, space-charge, simulation, focusing	649
	S. Bernal UMD, College Park, Maryland, USA
	Funding: This work is funded by the US Dept. of Energy We review the existing phenomenological theories of emittance growth with and without entropy terms and re-examine the condition for thermal equipartitioning in an unbunched charged-particle beam. The model incorporates linear space charge and a uniform-focusing lattice. Because of non-extensitivity of the transverse ("thermal") energy and the absence of a classical heat bath, we conclude that a rigorous classical thermodynamics treatment of charged-particle beams is not possible. In particular, the postulated relationships between the rms emittance and temperature and entropy must be qualified.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-MOPMA045
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MOPMA057	Space Charge Neutralization of 750 keV Proton Beam in LANSCE Injector Line	emittance, space-charge, simulation, proton	685
	Y.K. Batygin LANL, Los Alamos, New Mexico, USA
	Funding: Work supported by the United States Department of Energy, National Nuclear Security Agency, under contract DE-AC52-06NA25396 The 750-keV low-energy beam transport of the Los Alamos Neutron Science Center (LANSCE) linac consists of two independent beam lines for simultaneous injection of H⁺ and H⁻ beams into the linear accelerator. Space charge effects play an important role in the beam transport therein. A series of experiments were performed to determine the level of proton beam space charge neutralization by residual gas ionization, and time required for neutralization. Study was performed as emittance scans between pair of emittance measurement stations. The value of compensated space charge was determined through comparison of results of measurements and simulations using macroparticle method and envelope code. Obtained results provide new setup for beam tuning in transport beamline.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-MOPMA057
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TUPWI007	Algorithm of Reconstructing Particle Distribution in N-dimensional Phase Space from Profile in Beam Transport	simulation, quadrupole, induction, emittance	2256
	T. Aoki Hitachi Ltd., Ibaraki-ken, Japan
	In particle beam therapy, it is demanded to improve measurement of beam extracted from accelerator in order to realize more conformal irradiation. We developed a method of reconstructing particle distribution from measured profile in beam transport. In this method, particle distribution is obtained by solving a following equation: I=Dρ, where I is a counted number of particles at a single channel of the profile monitor, D is a matrix representing relation between I and ρ, and ρ is number of particles included in a single n-dimensional voxel of phase space at start point of the beam transport. D is a n×m matrix, where n is number of data which obtained under multiple conditions of beam transport, and m is number of voxels of phase space to be reconstructed. We succeeded formulation of D matrix from transportation matrix of the beam transport R, and discovered that D is formulated as piecewise-polynomials of elements of R. By this method, it is enable to reconstruct the particle distribution in arbitrary dimensional phase space. We show details of the formulation of D and results of simulations of reconstruction of particle distribution in phase space by this method.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-TUPWI007
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THPF023	Massless Beam Separation System for Intense Ion Beams	septum, shielding, dipole, vacuum	3736
	O. Payir, M. Droba, O. Meusel, D. Noll, U. Ratzinger, P.P. Schneider, C. Wiesner IAP, Frankfurt am Main, Germany
	The ExB chopper* in the Low Energy Beam Transport (LEBT) section of the accelerator-driven neutron source FRANZ** will form the required pulses with a repetition rate of 257 kHz out of the primary 120 keV, 50 mA DC proton beam. A following beam separation system will extract the deflected beam out of the beamline and minimize the thermal load by beam losses in the vacuum chamber. To further avoid an uncontrolled production of secondary particles, a novel massless septum system is designed for the beam separation. The septum system consists of a static C-magnet with optimized pole shapes, which will extract the beam with minimal losses, and a magnetic shielding tube, which will shield the transmitted pulsed beam from the fringing field of the dipole. The magnetic field and the beam transport properties of the system were numerically investigated. A main deflection field of about 250 mT was achieved, whereas the fringing field was reduced to below 0.3 mT on the beam axis at 60 mm distance from the dipole. With this settings, the beam was numerically transported through the system with minimal emittance growth. Manufacturing of the septum system has started. * Wiesner, C., et al. "Chopping High-Intensity Ion Beams at FRANZ", WEIOB01, LINAC 2014. ** Meusel, O., et al. "FRANZ–Accelerator Test Bench And Neutron Source", MO3A03, LINAC 2012.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-THPF023
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THPF050	Applications of Beam Parameter Measurements in Transport Lines at CSNS	linac, optics, DTL, factory	3815
	Z.P. Li, L. Huang, Y. Li, J. Peng, S. Wang IHEP, Beijing, People's Republic of China
	Several XAL-based applications for parameter measurements in Medium Energy Beam Transport line (MEBT) and Linac to Ring Beam Transport line (LRBT) at China Spallation Neutron Source (CSNS) have been developed. Algorithms and functions of these applications are introduced in this paper. Real Machine tests are carried out in the MEBT commissioning.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-THPF050
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THPF080	Status of the ESS Accelerator Construction Project	target, klystron, linac, proton	3870
	M. Lindroos, H. Danared, R. Garoby, D.P. McGinnis, E. Tanke ESS, Lund, Sweden
	The European spallation source is now under construction just outside in Lund in Sweden. The driver is a 5 MW linac operating at a duty factor of 4% and at 2 GeV. The detailed design of the buildings is just being completed, and the casting of the accelerator tunnel has started. The accelerator design is getting mature with the major parts under prototyping. A challenging aspect of the project is the large percentage of in-kind contributions. For the accelerator this is now reaching 47% percent in pre commitments by institutes and universities in the ESS member states. We will in this paper give an overview of the ESS accelerator design, the status of prototyping and the organization of the in-kind accelerator construction project.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-THPF080
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THPF108	EBIS Charge Breeder at ANL and its Integration into ATLAS	ion, dipole, simulation, electron	3969
	A. Perry, A. Barcikowski, G.L. Cherry, C. Dickerson, B. Mustapha, P.N. Ostroumov ANL, Argonne, Illinois, USA
	Funding: This work was supported by the U.S. Department of Energy, Office of Nuclear Physics, under Contract DE-AC02-06CH11357. An Electron Beam Ion Source charge breeder (EBIS-CB) has been developed to breed CARIBU radioactive beams at ATLAS and is in the final stages of off-line commissioning. Within the next year, the EBIS-CB will replace the existing ECR charge breeder to increase the intensity and improve the purity of reaccelerated radioactive ion beams. Integration of the new EBIS-CB requires: a. Building a compact fully electrostatic low energy beam transport line (LEBT) from CARIBU to the EBIS-CB that satisfies the spatial constraints and ensures the successful ion seeding into the EBIS trap. b. Modifications to the existing ATLAS LEBT to purify the EBIS beams by q/A selection and accommodate the injection of the charge bred ions into ATLAS. In this paper, we will describe the beam line design and present beam dynamics simulation results.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-THPF108
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THPF148	LANSCE H⁺ RFQ Status	rfq, ion, ion-source, linac	4073
	R.W. Garnett, Y.K. Batygin, C.A. Chapman, I.N. Draganic, C.M. Fortgang, S.S. Kurennoy, R.C. McCrady, J.F. O'Hara, E.R. Olivas, L. Rybarcyk, H.R. Salazar LANL, Los Alamos, New Mexico, USA J. Haeuser Kress GmbH, Biebergemuend, Germany B. Koubek, A. Schempp IAP, Frankfurt am Main, Germany
	Funding: This work is supported by the U. S. Department of Energy Contract DE-AC52-06NA25396. The LANSCE linear accelerator at Los Alamos National Laboratory provides H⁻ and H⁺ beams to several user facilities that support Isotope Production, NNSA Stockpile Stewardship, and Basic Energy Science programs. These beams are initially accelerated to 750 keV using Cockcroft-Walton (CW) based injectors that have been in operation for over 37 years. To reduce long-term operational risks and to realize future beam performance goals for LANSCE we are completing fabrication of a 4-rod Radio-Frequency Quadrupole (RFQ) and design of an associated beam transport line that together will eventually become the modern injector replacement for the existing obsolete H⁺ injector system. A similar H⁻ system is also planned for future implementation. An update on the status and progress of the project will be presented.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-THPF148
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Paper

Title

Other Keywords

Page

MOPWA045

First Tests of a Beam Transport System from a Laser Wakefield Accelerator to a Transverse Gradient Undulator

electron, quadrupole, undulator, dipole

216

C. Widmann, V. Afonso Rodríguez, A. Bernhard, A.-S. Müller, R. Rossmanith, W. Werner
KIT, Karlsruhe, Germany
M. Kaluza, M. Nicolai, M.B. Schwab, A. Sävert
IOQ, Jena, Germany
M. Kaluza, S. Kuschel
HIJ, Jena, Germany

An experimental setup for the generation of monochromatic undulator radiation at the laser wakefield accelerator (LWFA) in Jena using a transverse gradient undulator (TGU) is planned. Proper matching of the betatron functions and the dispersion of the electron beam to the undulator is essential. Therefor a beam transport system with strong focusing magnets and chromatic correction of these magnets is required. As a first step, a linear beam transport system without chromatic correction was assembled at the LWFA. With this setup the electron beam’s dispersion and the beta function of one selected energy are matched to the required parameters at the TGU. This contribution presents the experimental results of these measurements.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-MOPWA045

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MOPMA045

Conceptual Difficulties of a Thermodynamics Description of Charged-Particle Beams

emittance, space-charge, simulation, focusing

649

S. Bernal
UMD, College Park, Maryland, USA

Funding: This work is funded by the US Dept. of Energy
We review the existing phenomenological theories of emittance growth with and without entropy terms and re-examine the condition for thermal equipartitioning in an unbunched charged-particle beam. The model incorporates linear space charge and a uniform-focusing lattice. Because of non-extensitivity of the transverse ("thermal") energy and the absence of a classical heat bath, we conclude that a rigorous classical thermodynamics treatment of charged-particle beams is not possible. In particular, the postulated relationships between the rms emittance and temperature and entropy must be qualified.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-MOPMA045

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MOPMA057

Space Charge Neutralization of 750 keV Proton Beam in LANSCE Injector Line

emittance, space-charge, simulation, proton

685

Y.K. Batygin
LANL, Los Alamos, New Mexico, USA

Funding: Work supported by the United States Department of Energy, National Nuclear Security Agency, under contract DE-AC52-06NA25396
The 750-keV low-energy beam transport of the Los Alamos Neutron Science Center (LANSCE) linac consists of two independent beam lines for simultaneous injection of H⁺ and H⁻ beams into the linear accelerator. Space charge effects play an important role in the beam transport therein. A series of experiments were performed to determine the level of proton beam space charge neutralization by residual gas ionization, and time required for neutralization. Study was performed as emittance scans between pair of emittance measurement stations. The value of compensated space charge was determined through comparison of results of measurements and simulations using macroparticle method and envelope code. Obtained results provide new setup for beam tuning in transport beamline.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-MOPMA057

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

TUPWI007

Algorithm of Reconstructing Particle Distribution in N-dimensional Phase Space from Profile in Beam Transport

simulation, quadrupole, induction, emittance

2256

T. Aoki
Hitachi Ltd., Ibaraki-ken, Japan

In particle beam therapy, it is demanded to improve measurement of beam extracted from accelerator in order to realize more conformal irradiation. We developed a method of reconstructing particle distribution from measured profile in beam transport. In this method, particle distribution is obtained by solving a following equation: I=Dρ, where I is a counted number of particles at a single channel of the profile monitor, D is a matrix representing relation between I and ρ, and ρ is number of particles included in a single n-dimensional voxel of phase space at start point of the beam transport. D is a n×m matrix, where n is number of data which obtained under multiple conditions of beam transport, and m is number of voxels of phase space to be reconstructed. We succeeded formulation of D matrix from transportation matrix of the beam transport R, and discovered that D is formulated as piecewise-polynomials of elements of R. By this method, it is enable to reconstruct the particle distribution in arbitrary dimensional phase space. We show details of the formulation of D and results of simulations of reconstruction of particle distribution in phase space by this method.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-TUPWI007

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THPF023

Massless Beam Separation System for Intense Ion Beams

septum, shielding, dipole, vacuum

3736

O. Payir, M. Droba, O. Meusel, D. Noll, U. Ratzinger, P.P. Schneider, C. Wiesner
IAP, Frankfurt am Main, Germany

The ExB chopper* in the Low Energy Beam Transport (LEBT) section of the accelerator-driven neutron source FRANZ** will form the required pulses with a repetition rate of 257 kHz out of the primary 120 keV, 50 mA DC proton beam. A following beam separation system will extract the deflected beam out of the beamline and minimize the thermal load by beam losses in the vacuum chamber. To further avoid an uncontrolled production of secondary particles, a novel massless septum system is designed for the beam separation. The septum system consists of a static C-magnet with optimized pole shapes, which will extract the beam with minimal losses, and a magnetic shielding tube, which will shield the transmitted pulsed beam from the fringing field of the dipole. The magnetic field and the beam transport properties of the system were numerically investigated. A main deflection field of about 250 mT was achieved, whereas the fringing field was reduced to below 0.3 mT on the beam axis at 60 mm distance from the dipole. With this settings, the beam was numerically transported through the system with minimal emittance growth. Manufacturing of the septum system has started.
* Wiesner, C., et al. "Chopping High-Intensity Ion Beams at FRANZ", WEIOB01, LINAC 2014.
** Meusel, O., et al. "FRANZ–Accelerator Test Bench And Neutron Source", MO3A03, LINAC 2012.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-THPF023

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THPF050

Applications of Beam Parameter Measurements in Transport Lines at CSNS

linac, optics, DTL, factory

3815

Z.P. Li, L. Huang, Y. Li, J. Peng, S. Wang
IHEP, Beijing, People's Republic of China

Several XAL-based applications for parameter measurements in Medium Energy Beam Transport line (MEBT) and Linac to Ring Beam Transport line (LRBT) at China Spallation Neutron Source (CSNS) have been developed. Algorithms and functions of these applications are introduced in this paper. Real Machine tests are carried out in the MEBT commissioning.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-THPF050

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

THPF080

Status of the ESS Accelerator Construction Project

target, klystron, linac, proton

3870

M. Lindroos, H. Danared, R. Garoby, D.P. McGinnis, E. Tanke
ESS, Lund, Sweden

The European spallation source is now under construction just outside in Lund in Sweden. The driver is a 5 MW linac operating at a duty factor of 4% and at 2 GeV. The detailed design of the buildings is just being completed, and the casting of the accelerator tunnel has started. The accelerator design is getting mature with the major parts under prototyping. A challenging aspect of the project is the large percentage of in-kind contributions. For the accelerator this is now reaching 47% percent in pre commitments by institutes and universities in the ESS member states. We will in this paper give an overview of the ESS accelerator design, the status of prototyping and the organization of the in-kind accelerator construction project.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-THPF080

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THPF108

EBIS Charge Breeder at ANL and its Integration into ATLAS

ion, dipole, simulation, electron

3969

A. Perry, A. Barcikowski, G.L. Cherry, C. Dickerson, B. Mustapha, P.N. Ostroumov
ANL, Argonne, Illinois, USA

Funding: This work was supported by the U.S. Department of Energy, Office of Nuclear Physics, under Contract DE-AC02-06CH11357.
An Electron Beam Ion Source charge breeder (EBIS-CB) has been developed to breed CARIBU radioactive beams at ATLAS and is in the final stages of off-line commissioning. Within the next year, the EBIS-CB will replace the existing ECR charge breeder to increase the intensity and improve the purity of reaccelerated radioactive ion beams. Integration of the new EBIS-CB requires: a. Building a compact fully electrostatic low energy beam transport line (LEBT) from CARIBU to the EBIS-CB that satisfies the spatial constraints and ensures the successful ion seeding into the EBIS trap. b. Modifications to the existing ATLAS LEBT to purify the EBIS beams by q/A selection and accommodate the injection of the charge bred ions into ATLAS. In this paper, we will describe the beam line design and present beam dynamics simulation results.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-THPF108

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THPF148

LANSCE H⁺ RFQ Status

rfq, ion, ion-source, linac

4073

R.W. Garnett, Y.K. Batygin, C.A. Chapman, I.N. Draganic, C.M. Fortgang, S.S. Kurennoy, R.C. McCrady, J.F. O'Hara, E.R. Olivas, L. Rybarcyk, H.R. Salazar
LANL, Los Alamos, New Mexico, USA
J. Haeuser
Kress GmbH, Biebergemuend, Germany
B. Koubek, A. Schempp
IAP, Frankfurt am Main, Germany

Funding: This work is supported by the U. S. Department of Energy Contract DE-AC52-06NA25396.
The LANSCE linear accelerator at Los Alamos National Laboratory provides H⁻ and H⁺ beams to several user facilities that support Isotope Production, NNSA Stockpile Stewardship, and Basic Energy Science programs. These beams are initially accelerated to 750 keV using Cockcroft-Walton (CW) based injectors that have been in operation for over 37 years. To reduce long-term operational risks and to realize future beam performance goals for LANSCE we are completing fabrication of a 4-rod Radio-Frequency Quadrupole (RFQ) and design of an associated beam transport line that together will eventually become the modern injector replacement for the existing obsolete H⁺ injector system. A similar H⁻ system is also planned for future implementation. An update on the status and progress of the project will be presented.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-THPF148

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