IPAC2015 - List of Authors (Bartmann, W.)

Paper	Title	Page
MOPJE043	Design and Optimization of Electrostatic Deflectors for ELENA	382
	D. Barna University of Tokyo, Tokyo, Japan W. Bartmann, M.A. Fraser, R. Ostojić CERN, Geneva, Switzerland
	The ELENA ring will decelerate the antiprotons ejected from the Antiproton Decelerator (AD) at 5.3 MeV down to 100 keV kinetic energy. The slow antiprotons will be delivered to experiments using electrostatic beamlines, consisting of quadrupoles, correctors and deflectors. An extensive simulation study was carried out to find solutions to minimize the aberrations of the deflectors. These solutions will be presented together with the actual design of these devices.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-MOPJE043
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MOPJE044	Beam Dynamics Studies of the ELENA Electrostatic Transfer Lines	385
	M.A. Fraser, W. Bartmann, R. Ostojić CERN, Geneva, Switzerland D. Barna University of Tokyo, Tokyo, Japan
	The low-energy ELENA ring at the Antiproton Decelerator (AD) facility at CERN will lower the kinetic energy of antiproton beams from 5.3 MeV to 100 keV, significantly increasing the antiproton trapping efficiency at the experiments. The antiprotons from ELENA will be distributed to two experimental areas housing several different experiments through a system of electrostatic transfer lines totalling 90 m in length. A significant optimisation of the electrostatic optical elements (deflectors, quadrupoles, and correctors) has been carried out to improve the beam quality delivered to the experiments and facilitate installation of the beam lines into the AD hall. A general overview of the beam optics is presented, including end-to-end particle tracking and error studies from the extraction point in the ELENA ring to the experiments.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-MOPJE044
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TUPTY039	LHC Transfer Lines and Injection Tests for Run 2	2098
	C. Bracco, J.L. Abelleira, R. Alemany-Fernández, M.J. Barnes, W. Bartmann, E. Carlier, L.N. Drøsdal, M.A. Fraser, K. Fuchsberger, B. Goddard, J. Jentzsch, V. Kain, N. Magnin, M. Meddahi, J.S. Schmidt, L.S. Stoel, J.A. Uythoven, F.M. Velotti, J. Wenninger CERN, Geneva, Switzerland
	The transfer lines for both rings of the LHC were successfully re-commissioned with beam in preparation for the start-up of Run 2. This paper presents an overview of the transfer line and sector tests performed to bring the LHC back into operation after a two-year period of shutdown for consolidation and upgrade. The tests enabled the debugging of critical software and hardware systems and validated changes made to the transfer and injection systems. The beam-based measurements carried out to validate the optics and machine configuration are summarised along with the performance of the hardware systems.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-TUPTY039
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TUPTY050	Considerations for the Beam Dump System of a 100 TeV Centre-of-mass FCC hh Collider	2132
	T. Kramer, M.G. Atanasov, M.J. Barnes, W. Bartmann, J. Borburgh, E. Carlier, F. Cerutti, L. Ducimetière, B. Goddard, A. Lechner, R. Losito, G.E. Steele, L.S. Stoel, J.A. Uythoven, F.M. Velotti CERN, Geneva, Switzerland
	A 100 TeV centre-of-mass energy frontier proton collider in a new tunnel of 80–100 km circumference is a central part of CERN’s Future Circular Colliders (FCC) design study. One of the major challenges for such a machine will be the beam dump system, which for each ring will have to reliably abort proton beams with stored energies in the range of 8 Gigajoule, more than an order of magnitude higher than planned for HL-LHC. The transverse proton beam energy densities are even more extreme, a factor of 100 above that of the presently operating LHC. The requirements for the beam dump subsystems are outlined, and the present technological limitations are described. First concepts for the beam dump system are presented and the feasibility is discussed, highlighting in particular the areas in which major technological progress will be needed. The potential implications on the overall machine and other key subsystems are described, including constraints on filling patterns, interlocking, beam intercepting devices and insertion design.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-TUPTY050
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WEPMN067	Upgrade of the TCDQ Diluters for the LHC Beam Dump System	3079
	M.G. Atanasov, W. Bartmann, J. Borburgh, C. Boucly, C. Bracco, L. Gentini, B. Moles, W.J.M. Weterings CERN, Geneva, Switzerland
	The TCDQ diluters are installed as part of the LHC beam dump system to protect the Q4 quadrupole and other downstream elements during a beam dump that is not synchronised with the abort gap, or in case of erratic firing of the extraction kickers. These diluter elements installed during Run 1 were compatible with beam up to 60 % of the nominal intensity, which was insufficient for the second run of the LHC. This paper describes the requirements for the upgrade done during the First Long Shutdown (LS1), to make the TCDQ compatible with the full 7 TeV LHC beam at intensities required for the future runs of the machine. Subsequently the mechanical design changes, implementation and commissioning of the TCDQ are reported.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-WEPMN067
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THPF082	Considerations on the Fast Pulsed Magnet Systems for the 2 GeV Beam Transfer from the CERN PSB to PS	3876
	T. Kramer, J.L. Abelleira, W. Bartmann, J. Borburgh, L. Ducimetière, L.M.C. Feliciano, B. Goddard, L. Sermeus CERN, Geneva, Switzerland
	Within the scope of the LIU project the CERN PS Booster to PS beam transfer will be modified to match the requirements for the future 2 GeV proton beam energy upgrade. The paper describes considerations on the PSB extraction and recombination kickers as well as on the injection kicker(s) into the PS. Different schemes of an injection into the PS have been outlined in the past and are reviewed under the aspect of individual transfer kicker rise and fall time performances. Recent measurements on the recombination kickers are presented and subsequently homogenous rise and fall time requirements in the whole PSB to PS transfer chain are presented. The baseline option for the PS injection kicker(s) is outlined and compared to the previously presented concepts.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-THPF082
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THPF083	Painting Schemes for CERN PS Booster H⁻ Injection	3879
	J.L. Abelleira, W. Bartmann, E. Benedetto, C. Bracco, G.P. Di Giovanni, V. Forte, M. Kowalska, M. Meddahi, B. Mikulec, G. Rumolo CERN, Geneva, Switzerland V. Forte Université Blaise Pascal, Clermont-Ferrand, France M. Kowalska EPFL, Lausanne, Switzerland
	The present 50-MeV proton injection into the PS Booster will be replaced by a H⁻ charge exchange injection at 160 MeV to be provided by Linac 4. The higher energy will allow producing beams at higher brightness. A set of kicker magnets (KSW) will move the beam across the stripping foil to perform phase space painting in the horizontal plane to reduce space charge effects. The PSB must satisfy the different users with very different beams in terms of emittance and intensity. Therefore, the KSW waveforms must be adapted for each case to meet the beam characteristics while minimizing beam losses. Here we present the results of the simulations performed to optimise the injection system. A detailed analysis of the different painting schemes is discussed, including the effect of the working point on the painted beam, and variations in the offset of the injected beam.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-THPF083
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THPF089	Beam Transfer to the FCC-hh Collider from a 3.3 TeV Booster in the LHC Tunnel	3901
	W. Bartmann, M.J. Barnes, M.A. Fraser, B. Goddard, W. Herr, J. Holma, V. Kain, T. Kramer, M. Meddahi, A. Milanese, R. Ostojić, L.S. Stoel, J.A. Uythoven, F.M. Velotti CERN, Geneva, Switzerland
	Transfer of the high brightness 3.3 TeV proton beams from the High Energy Booster (HEB) to the 100 TeV centre-of-mass proton collider in a new tunnel of 80–100 km circumference will be a major challenge. The extremely high stored beam energy means that machine protection considerations will constrain the functional design of the transfer, for instance in the amount of beam transferred, the kicker rise and fall times and hence the collider filling pattern. In addition the transfer lines may need dedicated insertions for passive protection devices. The requirements and constraints are described, and a first concept for the 3.3 TeV beam transfer between the machines is outlined. The resulting implications on the parameters and design of the various kicker systems are explored, in the context of the available technology. The general features of the transfer lines between the machines are described, with the expected constraints on the collider layout and insertion lengths.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-THPF089
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THPF090	Status and Plans for the Upgrade of the CERN PS Booster	3905
	K. Hanke, D. Aguglia, M.E. Angoletta, W. Bartmann, C. Bedel, E. Benedetto, S. Bertolasi, C. Bertone, J. Betz, T.W. Birtwistle, A. Blas, J. Borburgh, C. Bracco, A.C. Butterworth, E. Carlier, S. Chemli, P. Dahlen, A. Dallocchio, G.P. Di Giovanni, T. Dobers, A. Findlay, R. Froeschl, A. Funken, S. Gabourin, J.L. Grenard, D. Grenier, J. Hansen, D. Hay, J.-M. Lacroix, P. Le Roux, L.A. Lopez Hernandez, C. Martin, A. Masi, B. Mikulec, Y. Muttoni, A. Newborough, D. Nisbet, M.R. Obrecht, M.M. Paoluzzi, S. Pittet, B. Puccio, J. Tan, J. Vollaire, W.J.M. Weterings CERN, Geneva, Switzerland
	CERN’s Proton Synchrotron Booster (PSB) is undergoing a major upgrade program in the frame of the LHC Injectors Upgrade (LIU) project. During the first long LHC shutdown (LS1) some parts of the upgrade have already been implemented, and the machine has been successfully re-commissioned. More work is planned for the upcoming end-of-year technical stops, notably in 2016/17, while most of the upgrade is planned to take place during the second long LHC shutdown (LS2). We report on the upgrade items already completed and commissioned, the first Run 2 beam performance and give a status of the ongoing design and integration work.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-THPF090
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THPF094	Possible Reuse of the LHC as a 3.3 TeV High Energy Booster for Hadron Injection into the FCC-hh Collider	3919
	B. Goddard, W. Bartmann, M. Benedikt, W. Herr, M. Lamont, P. Lebrun, M. Meddahi, A. Milanese, M. Solfaroli Camillocci, L.S. Stoel CERN, Geneva, Switzerland
	One option for the injector into a 100 TeV centre-of-mass energy frontier proton collider (FCC-hh) in a new tunnel of 80–100 km circumference is to reuse a suitably modified LHC as 3.3 TeV High Energy Booster (HEB). The changes that would be required to the existing LHC insertions are described, including the types and numbers of new magnets and circuits. The limitations on the maximum LHC ramp rate and minimum cycle time discussed. The key question of the minimum FCC filling time achievable with technically possible upgrades is examined, together with the issues of decommissioning for the elements which would need to be removed from the machine. The potential performance reach of the modified LHC as 3.3 TeV HEB is quantified, and implications for FCC-hh discussed.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-THPF094
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THPF098	SPS-to-LHC Transfer Lines Loss Map Generation Using PyCollimate	3934
	F.M. Velotti EPFL, Lausanne, Switzerland W. Bartmann, C. Bracco, M.A. Fraser, B. Goddard, V. Kain, M. Meddahi, F.M. Velotti CERN, Geneva, Switzerland
	The Transfer Lines (TL) linking the Super Proton Synchrotron (SPS) to the Large Hadron Collider (LHC) are both equipped with a complete collimation system to protect the LHC against mis-steered beams. During the setting up of these collimators, their gaps are positioned to nominal values and the phase-space coverage of the whole system is checked using a manual validation procedure. In order to perform this setting-up more efficiently and more reliably, the simulated loss maps of the TLs will be used to validate the collimator positions and settings. In this paper, the simulation procedure for the generation of TL loss maps is described, and a detailed overview of the new scattering routine (pycollimate) is given. Finally, the results of simulations benchmark with another scattering routine are presented.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-THPF098
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Paper

Title

Page

Design and Optimization of Electrostatic Deflectors for ELENA

382

D. Barna
University of Tokyo, Tokyo, Japan
W. Bartmann, M.A. Fraser, R. Ostojić
CERN, Geneva, Switzerland

The ELENA ring will decelerate the antiprotons ejected from the Antiproton Decelerator (AD) at 5.3 MeV down to 100 keV kinetic energy. The slow antiprotons will be delivered to experiments using electrostatic beamlines, consisting of quadrupoles, correctors and deflectors. An extensive simulation study was carried out to find solutions to minimize the aberrations of the deflectors. These solutions will be presented together with the actual design of these devices.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-MOPJE043

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MOPJE044

Beam Dynamics Studies of the ELENA Electrostatic Transfer Lines

385

M.A. Fraser, W. Bartmann, R. Ostojić
CERN, Geneva, Switzerland
D. Barna
University of Tokyo, Tokyo, Japan

The low-energy ELENA ring at the Antiproton Decelerator (AD) facility at CERN will lower the kinetic energy of antiproton beams from 5.3 MeV to 100 keV, significantly increasing the antiproton trapping efficiency at the experiments. The antiprotons from ELENA will be distributed to two experimental areas housing several different experiments through a system of electrostatic transfer lines totalling 90 m in length. A significant optimisation of the electrostatic optical elements (deflectors, quadrupoles, and correctors) has been carried out to improve the beam quality delivered to the experiments and facilitate installation of the beam lines into the AD hall. A general overview of the beam optics is presented, including end-to-end particle tracking and error studies from the extraction point in the ELENA ring to the experiments.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-MOPJE044

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TUPTY039

LHC Transfer Lines and Injection Tests for Run 2

2098

C. Bracco, J.L. Abelleira, R. Alemany-Fernández, M.J. Barnes, W. Bartmann, E. Carlier, L.N. Drøsdal, M.A. Fraser, K. Fuchsberger, B. Goddard, J. Jentzsch, V. Kain, N. Magnin, M. Meddahi, J.S. Schmidt, L.S. Stoel, J.A. Uythoven, F.M. Velotti, J. Wenninger
CERN, Geneva, Switzerland

The transfer lines for both rings of the LHC were successfully re-commissioned with beam in preparation for the start-up of Run 2. This paper presents an overview of the transfer line and sector tests performed to bring the LHC back into operation after a two-year period of shutdown for consolidation and upgrade. The tests enabled the debugging of critical software and hardware systems and validated changes made to the transfer and injection systems. The beam-based measurements carried out to validate the optics and machine configuration are summarised along with the performance of the hardware systems.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-TUPTY039

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TUPTY050

Considerations for the Beam Dump System of a 100 TeV Centre-of-mass FCC hh Collider

2132

T. Kramer, M.G. Atanasov, M.J. Barnes, W. Bartmann, J. Borburgh, E. Carlier, F. Cerutti, L. Ducimetière, B. Goddard, A. Lechner, R. Losito, G.E. Steele, L.S. Stoel, J.A. Uythoven, F.M. Velotti
CERN, Geneva, Switzerland

A 100 TeV centre-of-mass energy frontier proton collider in a new tunnel of 80–100 km circumference is a central part of CERN’s Future Circular Colliders (FCC) design study. One of the major challenges for such a machine will be the beam dump system, which for each ring will have to reliably abort proton beams with stored energies in the range of 8 Gigajoule, more than an order of magnitude higher than planned for HL-LHC. The transverse proton beam energy densities are even more extreme, a factor of 100 above that of the presently operating LHC. The requirements for the beam dump subsystems are outlined, and the present technological limitations are described. First concepts for the beam dump system are presented and the feasibility is discussed, highlighting in particular the areas in which major technological progress will be needed. The potential implications on the overall machine and other key subsystems are described, including constraints on filling patterns, interlocking, beam intercepting devices and insertion design.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-TUPTY050

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WEPMN067

Upgrade of the TCDQ Diluters for the LHC Beam Dump System

3079

M.G. Atanasov, W. Bartmann, J. Borburgh, C. Boucly, C. Bracco, L. Gentini, B. Moles, W.J.M. Weterings
CERN, Geneva, Switzerland

The TCDQ diluters are installed as part of the LHC beam dump system to protect the Q4 quadrupole and other downstream elements during a beam dump that is not synchronised with the abort gap, or in case of erratic firing of the extraction kickers. These diluter elements installed during Run 1 were compatible with beam up to 60 % of the nominal intensity, which was insufficient for the second run of the LHC. This paper describes the requirements for the upgrade done during the First Long Shutdown (LS1), to make the TCDQ compatible with the full 7 TeV LHC beam at intensities required for the future runs of the machine. Subsequently the mechanical design changes, implementation and commissioning of the TCDQ are reported.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-WEPMN067

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THPF082

Considerations on the Fast Pulsed Magnet Systems for the 2 GeV Beam Transfer from the CERN PSB to PS

3876

T. Kramer, J.L. Abelleira, W. Bartmann, J. Borburgh, L. Ducimetière, L.M.C. Feliciano, B. Goddard, L. Sermeus
CERN, Geneva, Switzerland

Within the scope of the LIU project the CERN PS Booster to PS beam transfer will be modified to match the requirements for the future 2 GeV proton beam energy upgrade. The paper describes considerations on the PSB extraction and recombination kickers as well as on the injection kicker(s) into the PS. Different schemes of an injection into the PS have been outlined in the past and are reviewed under the aspect of individual transfer kicker rise and fall time performances. Recent measurements on the recombination kickers are presented and subsequently homogenous rise and fall time requirements in the whole PSB to PS transfer chain are presented. The baseline option for the PS injection kicker(s) is outlined and compared to the previously presented concepts.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-THPF082

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THPF083

Painting Schemes for CERN PS Booster H⁻ Injection

3879

J.L. Abelleira, W. Bartmann, E. Benedetto, C. Bracco, G.P. Di Giovanni, V. Forte, M. Kowalska, M. Meddahi, B. Mikulec, G. Rumolo
CERN, Geneva, Switzerland
V. Forte
Université Blaise Pascal, Clermont-Ferrand, France
M. Kowalska
EPFL, Lausanne, Switzerland

The present 50-MeV proton injection into the PS Booster will be replaced by a H⁻ charge exchange injection at 160 MeV to be provided by Linac 4. The higher energy will allow producing beams at higher brightness. A set of kicker magnets (KSW) will move the beam across the stripping foil to perform phase space painting in the horizontal plane to reduce space charge effects. The PSB must satisfy the different users with very different beams in terms of emittance and intensity. Therefore, the KSW waveforms must be adapted for each case to meet the beam characteristics while minimizing beam losses. Here we present the results of the simulations performed to optimise the injection system. A detailed analysis of the different painting schemes is discussed, including the effect of the working point on the painted beam, and variations in the offset of the injected beam.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-THPF083

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THPF089

Beam Transfer to the FCC-hh Collider from a 3.3 TeV Booster in the LHC Tunnel

3901

W. Bartmann, M.J. Barnes, M.A. Fraser, B. Goddard, W. Herr, J. Holma, V. Kain, T. Kramer, M. Meddahi, A. Milanese, R. Ostojić, L.S. Stoel, J.A. Uythoven, F.M. Velotti
CERN, Geneva, Switzerland

Transfer of the high brightness 3.3 TeV proton beams from the High Energy Booster (HEB) to the 100 TeV centre-of-mass proton collider in a new tunnel of 80–100 km circumference will be a major challenge. The extremely high stored beam energy means that machine protection considerations will constrain the functional design of the transfer, for instance in the amount of beam transferred, the kicker rise and fall times and hence the collider filling pattern. In addition the transfer lines may need dedicated insertions for passive protection devices. The requirements and constraints are described, and a first concept for the 3.3 TeV beam transfer between the machines is outlined. The resulting implications on the parameters and design of the various kicker systems are explored, in the context of the available technology. The general features of the transfer lines between the machines are described, with the expected constraints on the collider layout and insertion lengths.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-THPF089

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THPF090

Status and Plans for the Upgrade of the CERN PS Booster

3905

K. Hanke, D. Aguglia, M.E. Angoletta, W. Bartmann, C. Bedel, E. Benedetto, S. Bertolasi, C. Bertone, J. Betz, T.W. Birtwistle, A. Blas, J. Borburgh, C. Bracco, A.C. Butterworth, E. Carlier, S. Chemli, P. Dahlen, A. Dallocchio, G.P. Di Giovanni, T. Dobers, A. Findlay, R. Froeschl, A. Funken, S. Gabourin, J.L. Grenard, D. Grenier, J. Hansen, D. Hay, J.-M. Lacroix, P. Le Roux, L.A. Lopez Hernandez, C. Martin, A. Masi, B. Mikulec, Y. Muttoni, A. Newborough, D. Nisbet, M.R. Obrecht, M.M. Paoluzzi, S. Pittet, B. Puccio, J. Tan, J. Vollaire, W.J.M. Weterings
CERN, Geneva, Switzerland

CERN’s Proton Synchrotron Booster (PSB) is undergoing a major upgrade program in the frame of the LHC Injectors Upgrade (LIU) project. During the first long LHC shutdown (LS1) some parts of the upgrade have already been implemented, and the machine has been successfully re-commissioned. More work is planned for the upcoming end-of-year technical stops, notably in 2016/17, while most of the upgrade is planned to take place during the second long LHC shutdown (LS2). We report on the upgrade items already completed and commissioned, the first Run 2 beam performance and give a status of the ongoing design and integration work.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-THPF090

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THPF094

Possible Reuse of the LHC as a 3.3 TeV High Energy Booster for Hadron Injection into the FCC-hh Collider

3919

B. Goddard, W. Bartmann, M. Benedikt, W. Herr, M. Lamont, P. Lebrun, M. Meddahi, A. Milanese, M. Solfaroli Camillocci, L.S. Stoel
CERN, Geneva, Switzerland

One option for the injector into a 100 TeV centre-of-mass energy frontier proton collider (FCC-hh) in a new tunnel of 80–100 km circumference is to reuse a suitably modified LHC as 3.3 TeV High Energy Booster (HEB). The changes that would be required to the existing LHC insertions are described, including the types and numbers of new magnets and circuits. The limitations on the maximum LHC ramp rate and minimum cycle time discussed. The key question of the minimum FCC filling time achievable with technically possible upgrades is examined, together with the issues of decommissioning for the elements which would need to be removed from the machine. The potential performance reach of the modified LHC as 3.3 TeV HEB is quantified, and implications for FCC-hh discussed.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-THPF094

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THPF098

SPS-to-LHC Transfer Lines Loss Map Generation Using PyCollimate

3934

F.M. Velotti
EPFL, Lausanne, Switzerland
W. Bartmann, C. Bracco, M.A. Fraser, B. Goddard, V. Kain, M. Meddahi, F.M. Velotti
CERN, Geneva, Switzerland

The Transfer Lines (TL) linking the Super Proton Synchrotron (SPS) to the Large Hadron Collider (LHC) are both equipped with a complete collimation system to protect the LHC against mis-steered beams. During the setting up of these collimators, their gaps are positioned to nominal values and the phase-space coverage of the whole system is checked using a manual validation procedure. In order to perform this setting-up more efficiently and more reliably, the simulated loss maps of the TLs will be used to validate the collimator positions and settings. In this paper, the simulation procedure for the generation of TL loss maps is described, and a detailed overview of the new scattering routine (pycollimate) is given. Finally, the results of simulations benchmark with another scattering routine are presented.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-THPF098

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