HB2016 - List of Keywords (optics)

Paper	Title	Other Keywords	Page
MOPR027	Dynamic Beta and Beta-Beating Effects in the Presence of the Beam-Beam Interactions	quadrupole, lattice, collider, luminosity	136
	T. Pieloni, X. Buffat, L.E. Medina Medrano, C. Tambasco, R. Tomás CERN, Geneva, Switzerland J. Barranco, P. Concalves Jorge, C. Tambasco EPFL, Lausanne, Switzerland
	The Large Hadron Collider (LHC) has achieved correction of beta beat down to better than 5%. The beam-beam interactions at the four experiments result as extra quadrupole error in the lattice. This will produce a change of the β^* at the experiments and a beating along the arcs which for the High Luminosity LHC (HL-LHC) will be very large. Estimations of these effects will be given with the characterisation of the amplitude dependency. A first attempt to correct his beating is also discussed.
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MOPR029	On the Impact of Non-Symplecticity of Space Charge Solvers	space-charge, emittance, simulation, resonance	146
	M. Titze CERN, Geneva, Switzerland
	Funding: German Federal Ministry of Education and Research (BMBF) To guarantee long-term reliability in the predictions of a numerical integrator, it is a well-known requirement that the underlying map has to be symplectic. It is therefore important to examine in detail the impact on emittance growth and noise generation in case this condition is violated. We present a strategy of how to tackle this question and some results obtained for particular PIC and frozen space charge models.
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MOPR034	Suppression of Half-Integer Resonance in Fermilab Booster	lattice, space-charge, booster, resonance	164
	V.A. Lebedev, A. Valishev Fermilab, Batavia, Illinois, USA
	The particle losses at injection in the FNAL Booster are one of the major factors limiting the machine performance. The losses are caused by motion non-linearity due to direct space charge and due to non-linearity introduced by large values of chromaticity sextupoles required to suppress transverse instabilities. The report aims to address the former - the suppression of incoherent space charge effects by reducing deviations from the perfect periodicity of linear optics functions. It should be achieved by high accuracy optics measurements with subsequent optics correction and by removing known sources of optics perturbations. The study shows significant impact of optics correction on the half-integer stop band with subsequent reduction of particle loss. We use realistic Booster lattice model to understand the present limitations, and investigate the possible improvements which would allow high intensity operation with PIP-II parameters.
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MOPR035	Electron Lens for the Fermilab Integrable Optics Test Accelerator	electron, solenoid, gun, space-charge	170
	G. Stancari, A.V. Burov, K. Carlson, D.J. Crawford, V.A. Lebedev, J.R. Leibfritz, M.W. McGee, S. Nagaitsev, L.E. Nobrega, C.S. Park, E. Prebys, A.L. Romanov, J. Ruan, V.D. Shiltsev, Y.-M. Shin, J.C.T. Thangaraj, A. Valishev Fermilab, Batavia, Illinois, USA D. Noll IAP, Frankfurt am Main, Germany Y.-M. Shin Northern Illinois University, DeKalb, Illinois, USA
	Funding: Fermilab is operated by Fermi Research Alliance, LLC, under Contract DE-AC02-07CH11359 with the US Department of Energy. The Integrable Optics Test Accelerator (IOTA) is a research machine currently being designed and built at Fermilab. The research program includes the study of nonlinear integrable lattices, beam dynamics with self fields, and optical stochastic cooling. One section of the ring will contain an electron lens, a low-energy magnetized electron beam overlapping with the circulating beam. The electron lens can work as a nonlinear element, as an electron cooler, or as a space-charge compensator. We describe the physical principles, experiment design, and hardware implementation plans for the IOTA electron lens.
	Poster MOPR035 [5.399 MB]
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MOPL002	The DESIR Facility at GANIL-SPIRAL2: The Transfer Beam Lines	quadrupole, ion, diagnostics, emittance	179
	L. Perrot, P. Blache, S. Rousselot IPN, Orsay, France
	Funding: French ANR, Investissements d'Avenir, EQUIPEX. Contract number ANR-11-EQPX-0012. The new ISOL facility SPIRAL2 is currently being built at GANIL, Caen France. The commissioning of the accelerator is in progress since 2015. SPIRAL2 will produce a large number of new radioactive ion beams (RIB) at high intensities. In 2019, the DESIR facility will receive beams from the upgraded SPIRAL1 facility of GANIL (stable beam and target fragmentation), from the S3 Low Energy Branch (fusion-evaporation and deep-inelastic reactions). In order to deliver the RIB to the experimental set-ups installed in the DESIR hall, 110 meters of beam line are studied since 2014. This paper will focus on the recent studies which have been done on these transfer lines: beam optics and errors calculations, quadrupoles, diagnostics and mechanical designs.
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MOPL011	Laser Stripping H⁻ Charge Exchange Injection by Femtosecond Lasers	laser, resonance, proton, injection	212
	T.V. Gorlov ORNL, Oak Ridge, Tennessee, USA
	A new method for H⁻ laser assistant charge exchange injection using femtosecond laser pulses is considered. The existing method uses a divergent laser beam that allows compensation of angular and momentum spread of the stripped beam. The femtosecond laser pulse has a similar property that can compensate the spread and yield efficient laser stripping. Results of simulations with realistic femtosecond laser and H⁻ beam parameters are discussed. The proposed method may have some benefit for particular technical conditions compared with others.
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WEPM2X01	High Power Target Instrumentation at J-PARC for Neutron and Muon Sources	target, octupole, proton, neutron	391
	S.I. Meigo, A. Akutsu, K. Ikezaki, T.K. Kawasaki, H. Kinoshita, M. Nishikawa, M. Ooi JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken, Japan H. Fujimori, S.F. Fukuta KEK/JAEA, Ibaraki-Ken, Japan
	Funding: This work is partly supported by the MEXT Grant-in-Aid for Scientific Research (C) Grant no. 26390114. At the J-PARC, spallation neutron and muon sources are injected 3-GeV proton beam with power of 1 MW extracted from 25 Hz Rapid Cycling Synchrotron (RCS). Recently several shots of the beam with equivalent power of 1 MW were successfully delivered to the targets without significant beam loss. Since the pitting erosion on the mercury target vessel utilized for spallation neutron source is known to be proportional to the 4th power of the beam current density, peak current density at the target should be kept as low as possible so that we have developed beam-flattening system by nonlinear beam optics using octupole magnets. To carry out the beam tuning efficiently, beam-tuning tool had been developed by using SAD code system. It is found that the shape of the beam can be controlled as designed. By using anti-correlated painting at the injection of the RCS, the beam was found to be shaped more flat distribution. The peak current density at the target can be reduced by 30 % with the present nonlinear optics without significant beam loss around at octupole magnets, which mitigates 76 % of the damage at the target vessel.
	Slides WEPM2X01 [9.327 MB]
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THAM5Y01	Path to Beam Loss Reduction in the SNS Linac Using Measurements, Simulation and Collimation	emittance, linac, collimation, operation	548
	A.V. Aleksandrov, A.P. Shishlo ORNL, Oak Ridge, Tennessee, USA
	Funding: SNS is managed by UT-Battelle, LLC, under contract DE-AC05-00OR22725 for the U.S. Department of Energy. The SNS linac operation at its design average power currently is not limited by uncontrolled beam loss. However, further reduction of the beam loss remains an important aspect of the SNS linac tune up and operation. Even small “acceptable” beam loss leads to long term degradation of the accelerator equipment. The current state of model-based tuning at SNS leaves an unacceptably large residual beam loss level and has to be followed by an empirical, sometimes random, adjustment of many parameters to reduce the loss. This talk will discuss a set of coordinated efforts to develop tools for large dynamic range measurements, simulation and collimation in order to facilitate low loss linac tuning.
	Slides THAM5Y01 [7.186 MB]
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Paper

Title

Other Keywords

Page

MOPR027

Dynamic Beta and Beta-Beating Effects in the Presence of the Beam-Beam Interactions

quadrupole, lattice, collider, luminosity

136

T. Pieloni, X. Buffat, L.E. Medina Medrano, C. Tambasco, R. Tomás
CERN, Geneva, Switzerland
J. Barranco, P. Concalves Jorge, C. Tambasco
EPFL, Lausanne, Switzerland

The Large Hadron Collider (LHC) has achieved correction of beta beat down to better than 5%. The beam-beam interactions at the four experiments result as extra quadrupole error in the lattice. This will produce a change of the β^* at the experiments and a beating along the arcs which for the High Luminosity LHC (HL-LHC) will be very large. Estimations of these effects will be given with the characterisation of the amplitude dependency. A first attempt to correct his beating is also discussed.

Export •

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

MOPR029

On the Impact of Non-Symplecticity of Space Charge Solvers

space-charge, emittance, simulation, resonance

146

M. Titze
CERN, Geneva, Switzerland

Funding: German Federal Ministry of Education and Research (BMBF)
To guarantee long-term reliability in the predictions of a numerical integrator, it is a well-known requirement that the underlying map has to be symplectic. It is therefore important to examine in detail the impact on emittance growth and noise generation in case this condition is violated. We present a strategy of how to tackle this question and some results obtained for particular PIC and frozen space charge models.

Export •

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

MOPR034

Suppression of Half-Integer Resonance in Fermilab Booster

lattice, space-charge, booster, resonance

164

V.A. Lebedev, A. Valishev
Fermilab, Batavia, Illinois, USA

The particle losses at injection in the FNAL Booster are one of the major factors limiting the machine performance. The losses are caused by motion non-linearity due to direct space charge and due to non-linearity introduced by large values of chromaticity sextupoles required to suppress transverse instabilities. The report aims to address the former - the suppression of incoherent space charge effects by reducing deviations from the perfect periodicity of linear optics functions. It should be achieved by high accuracy optics measurements with subsequent optics correction and by removing known sources of optics perturbations. The study shows significant impact of optics correction on the half-integer stop band with subsequent reduction of particle loss. We use realistic Booster lattice model to understand the present limitations, and investigate the possible improvements which would allow high intensity operation with PIP-II parameters.

Export •

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

MOPR035

Electron Lens for the Fermilab Integrable Optics Test Accelerator

electron, solenoid, gun, space-charge

170

G. Stancari, A.V. Burov, K. Carlson, D.J. Crawford, V.A. Lebedev, J.R. Leibfritz, M.W. McGee, S. Nagaitsev, L.E. Nobrega, C.S. Park, E. Prebys, A.L. Romanov, J. Ruan, V.D. Shiltsev, Y.-M. Shin, J.C.T. Thangaraj, A. Valishev
Fermilab, Batavia, Illinois, USA
D. Noll
IAP, Frankfurt am Main, Germany
Y.-M. Shin
Northern Illinois University, DeKalb, Illinois, USA

Funding: Fermilab is operated by Fermi Research Alliance, LLC, under Contract DE-AC02-07CH11359 with the US Department of Energy.
The Integrable Optics Test Accelerator (IOTA) is a research machine currently being designed and built at Fermilab. The research program includes the study of nonlinear integrable lattices, beam dynamics with self fields, and optical stochastic cooling. One section of the ring will contain an electron lens, a low-energy magnetized electron beam overlapping with the circulating beam. The electron lens can work as a nonlinear element, as an electron cooler, or as a space-charge compensator. We describe the physical principles, experiment design, and hardware implementation plans for the IOTA electron lens.

Poster MOPR035 [5.399 MB]

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MOPL002

The DESIR Facility at GANIL-SPIRAL2: The Transfer Beam Lines

quadrupole, ion, diagnostics, emittance

179

L. Perrot, P. Blache, S. Rousselot
IPN, Orsay, France

Funding: French ANR, Investissements d'Avenir, EQUIPEX. Contract number ANR-11-EQPX-0012.
The new ISOL facility SPIRAL2 is currently being built at GANIL, Caen France. The commissioning of the accelerator is in progress since 2015. SPIRAL2 will produce a large number of new radioactive ion beams (RIB) at high intensities. In 2019, the DESIR facility will receive beams from the upgraded SPIRAL1 facility of GANIL (stable beam and target fragmentation), from the S3 Low Energy Branch (fusion-evaporation and deep-inelastic reactions). In order to deliver the RIB to the experimental set-ups installed in the DESIR hall, 110 meters of beam line are studied since 2014. This paper will focus on the recent studies which have been done on these transfer lines: beam optics and errors calculations, quadrupoles, diagnostics and mechanical designs.

Export •

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

MOPL011

Laser Stripping H⁻ Charge Exchange Injection by Femtosecond Lasers

laser, resonance, proton, injection

212

T.V. Gorlov
ORNL, Oak Ridge, Tennessee, USA

A new method for H⁻ laser assistant charge exchange injection using femtosecond laser pulses is considered. The existing method uses a divergent laser beam that allows compensation of angular and momentum spread of the stripped beam. The femtosecond laser pulse has a similar property that can compensate the spread and yield efficient laser stripping. Results of simulations with realistic femtosecond laser and H⁻ beam parameters are discussed. The proposed method may have some benefit for particular technical conditions compared with others.

Export •

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

WEPM2X01

High Power Target Instrumentation at J-PARC for Neutron and Muon Sources

target, octupole, proton, neutron

391

S.I. Meigo, A. Akutsu, K. Ikezaki, T.K. Kawasaki, H. Kinoshita, M. Nishikawa, M. Ooi
JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken, Japan
H. Fujimori, S.F. Fukuta
KEK/JAEA, Ibaraki-Ken, Japan

Funding: This work is partly supported by the MEXT Grant-in-Aid for Scientific Research (C) Grant no. 26390114.
At the J-PARC, spallation neutron and muon sources are injected 3-GeV proton beam with power of 1 MW extracted from 25 Hz Rapid Cycling Synchrotron (RCS). Recently several shots of the beam with equivalent power of 1 MW were successfully delivered to the targets without significant beam loss. Since the pitting erosion on the mercury target vessel utilized for spallation neutron source is known to be proportional to the 4th power of the beam current density, peak current density at the target should be kept as low as possible so that we have developed beam-flattening system by nonlinear beam optics using octupole magnets. To carry out the beam tuning efficiently, beam-tuning tool had been developed by using SAD code system. It is found that the shape of the beam can be controlled as designed. By using anti-correlated painting at the injection of the RCS, the beam was found to be shaped more flat distribution. The peak current density at the target can be reduced by 30 % with the present nonlinear optics without significant beam loss around at octupole magnets, which mitigates 76 % of the damage at the target vessel.

Slides WEPM2X01 [9.327 MB]

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THAM5Y01

Path to Beam Loss Reduction in the SNS Linac Using Measurements, Simulation and Collimation

emittance, linac, collimation, operation

548

A.V. Aleksandrov, A.P. Shishlo
ORNL, Oak Ridge, Tennessee, USA

Funding: SNS is managed by UT-Battelle, LLC, under contract DE-AC05-00OR22725 for the U.S. Department of Energy.
The SNS linac operation at its design average power currently is not limited by uncontrolled beam loss. However, further reduction of the beam loss remains an important aspect of the SNS linac tune up and operation. Even small “acceptable” beam loss leads to long term degradation of the accelerator equipment. The current state of model-based tuning at SNS leaves an unacceptably large residual beam loss level and has to be followed by an empirical, sometimes random, adjustment of many parameters to reduce the loss. This talk will discuss a set of coordinated efforts to develop tools for large dynamic range measurements, simulation and collimation in order to facilitate low loss linac tuning.

Slides THAM5Y01 [7.186 MB]

Export •

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