IPAC2014 - List of Keywords (antiproton)

Paper	Title	Other Keywords	Page
MOPRO036	Beam Life Time and Stability Studies for ELENA	electron, emittance, simulation, vacuum	154
	J. Resta-López, O. Karamyshev, D. Newton, C.P. Welsch Cockcroft Institute, Warrington, Cheshire, United Kingdom O. Karamyshev, D. Newton, C.P. Welsch The University of Liverpool, Liverpool, United Kingdom J. Resta-López IFIC, Valencia, Spain
	Funding: Work supported by the EU under Grant Agreement 624854 and the STFC Cockcroft Institute Core Grant No. ST/G008248/1. The Extremely Low ENergy Antiproton ring (ELENA) is a small synchrotron equipped with an electron cooler, which shall be constructed at CERN to decelerate antiprotons to energies as low as 100 keV. At such low energies it is very important to carefully take contributions from electron cooling and heating effects (e.g. on the residual gas) into account. Detailed investigations into the ion kinetics under consideration of effects from electron cooling and scattering on the residual gas have been carried out using the BETACOOL code. In this contribution a consistent explanation of the different physical effects acting on the beam in ELENA is given. Beam lifetime, equilibrium momentum spread and emittance are all estimated based on numerical simulations. Finally, optimum machine settings are presented as a result of optimization studies.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-MOPRO036
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MOPME066	Development of 400 kA Pulsed Power Supply for Magnetic Horn at FAIR Antiproton Target	radiation, operation, power-supply, coupling	517
	S.S. Mohite, R. Hettinger, K. Knie, I.J. Petzenhauser GSI, Darmstadt, Germany
	This report presents an overview of the magnetic horn and its pulsed power system at the upcoming FAIR (Facility for Antiproton and Ion Research) complex at GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, Germany. In the planned antiproton (pbar) separator scheme a magnetic horn will be used as a device for collection and focusing of highly divergent antiprotons emerging from the target with energies around 3 GeV and within a cone of about 80 mrad .To achieve the desired focusing effect, the horn needs to be powered with a current pulse of 400 kA peak amplitude at the same repetition rate as the primary proton beam, i.e. 0.1 Hz. In future, operation up to 0.2 Hz is planned without major design alterations. Due to civil construction and radiation protection limitations, possible technical realization of this system has some key design issues. The aim is to develop a reliable and efficient magnetic horn system for effective focusing of antiprotons by producing a very strong pulsed magnetic field.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-MOPME066
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MOPRI067	Beam Cooling Systems and Activities at GSI and FAIR	electron, experiment, ion, pick-up	757
	C. Dimopoulou GSI, Darmstadt, Germany
	Efficient and versatile beam cooling (electron and stochastic cooling) has been an indispensable ingredient for beam preparation and physics experiments at the GSI accelerator complex. The hot secondary beams emerging from the production targets can hardly be used, unless they are cooled. Beam stacking of low-abundant species relies on cooling. Cooling enables high-precision experiments with stored beams, counteracts the heating during internal target operation and controls decelerated beams. New challenges lie ahead within the FAIR project like (i) the ongoing integration downstream of the ESR of the low-energy CRYRING with its electron cooler, (ii) the developments for the demanding CR stochastic cooling system, (iii) the stacking scenarios with RF and stochastic cooling in the HESR/RESR. The function and parameters of the existing and future beam cooling systems are summarized. We report on the latest hardware developments as well as on improvements of the controls and operation software. Recent highlights and results from beam manipulations with cooling at GSI are shown. In focus are those benchmarking experiments, where the concepts for the new FAIR systems are verified. C. Dimopoulou on behalf of the GSI Beam Cooling Department, of the GSI Stored Beams Division and of the FAIR Project Team.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-MOPRI067
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TUOAA01	Progress Towards Doubling the Beam Power at Fermilab's Accelerator Complex	booster, target, operation, proton	904
	I. Kourbanis Fermilab, Batavia, Illinois, USA
	Funding: Work supported by the Fermi Research Alliance under contract to the U.S. Department of Energy. After a 16 month shutdown to reconfigure the Fermilab Accelerators for high power operations, the Fermilab Accelerator Complex is again providing beams for numerous Physics Experiments. By using the Recycler to slip stack protons while the Main Injector is ramping, the beam power at 120 GeV can reach 700 KW, a factor of 2 increase. The progress towards doubling the Fermilab's Accelerator complex beam power will be presented.
	Slides TUOAA01 [7.059 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUOAA01
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TUOAA03	Extra Low ENergy Antiproton ring ELENA: From the Conception to the Implementation Phase	experiment, electron, emittance, extraction	910
	C. Carli, W. Bartmann, P. Belochitskii, H. Breuker, F. Butin, T. Eriksson, S. Maury, S. Pasinelli, G. Tranquille CERN, Geneva, Switzerland W. Oelert Johannes Gutenberg University Mainz, Institut für Physik, Mainz, Germany
	The Extra Low Energy Antiproton ring (ELENA) is a CERN project aiming at constructing a small 30 m circumference synchrotron to further decelerate antiprotons from the Antiproton Decelerator AD from 5.3 MeV to 100 keV. Controlled deceleration in a synchrotron equipped with an electron cooler to reduce emittances in all three planes will allow the existing AD experiments to increase substantially their antiproton capture efficiencies and render new experiments possible. The ELENA design is now well advanced and the project is moving to the implementation phase. Component design and construction are taking place at present for installation foreseen during the second half of 2015 and beginning of 2016 followed by ring commissioning until the end of 2016. New electrostatic transfer lines to the experiments will be installed and commissioned during the first half of 2017 followed by the first physics operation with ELENA. Basic limitations like Intra Beam Scattering limiting the emittances obtained under electron cooling and direct space charge effects will be reviewed and the status of the project will be reported.
	Slides TUOAA03 [4.963 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUOAA03
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TUPRO041	Status of Ion-optical Design of the Collector Ring	optics, quadrupole, injection, kicker	1114
	O.E. Gorda, A. Dolinskyy, S.A. Litvinov GSI, Darmstadt, Germany D.E. Berkaev, I. Koop, P.Yu. Shatunov, D.B. Shwartz BINP SB RAS, Novosibirsk, Russia
	The Collector Ring at FAIR will be used for fast cooling of hot antiproton or ion beams. The ring layout as well as the injection and extraction scheme have been modified during the latest design stage. In this paper, we report on the present status of the ion-optical properties of the machine.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRO041
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TUPRO106	Status of the ELENA Magnet System	quadrupole, dipole, simulation, operation	1295
	D. Schoerling CERN, Geneva, Switzerland
	ELENA, the Extra Low ENergy Antiproton ring, will be a CERN facility with the purpose to deliver antiprotons at lowest energies aiming to enhance the study of antimatter. It will be a hexagonal shaped ring with a circumference of about 30 m decelerating antiprotons from energies of 5.3 MeV to 100 keV. Due to the extra-low beam rigidity the design of the magnet system is especially challenging because even small fields, for example arising from residual magnetization and hysteresis, will have a major impact both on the beam trajectory and beam dynamics. In this paper the design approach for such an extra-low beam rigidity magnet system is presented. The main challenges are outlined and solutions for the design of the magnet system are discussed.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRO106
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TUPRI028	Review of Rest Gas Interaction at Very Low Energies applied to the Extra Low ENergy Antiproton ring ELENA	scattering, emittance, ion, electron	1621
	C. Carli, T.L. Rijoff CERN, Geneva, Switzerland O. Karamyshev, C.P. Welsch Cockcroft Institute, Warrington, Cheshire, United Kingdom O. Karamyshev, C.P. Welsch The University of Liverpool, Liverpool, United Kingdom
	The Extremely Low ENergy Antiproton ring (ELENA) is a small synchrotron equipped with an electron cooler, which shall be constructed at CERN to decelerate antiprotons to energies as low as 100 keV. Scattering of beam particles on rest gas molecules may have a detrimental effect at such low energies and leads to stringent vacuum requirements. Within this contribution scattering of the stored beam on rest gas molecules is discussed for very low beam energies. It is important to carefully distinguish between antiprotons scattered out of the acceptance and lost, and those remaining inside the aperture to avoid overestimation of emittance blow-up. Furthermore, many antiprotons do not interact at all during the time they are stored in ELENA and hence this is not a multiple scattering process
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRI028
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WEPRO060	Status of the FAIR Accelerator Facility	ion, dipole, target, synchrotron	2084
	O.K. Kester, W.A. Barth, A. Dolinskyy, F. Hagenbuck, K. Knie, H. Reich-Sprenger, H. Simon, P.J. Spiller, U. Weinrich, M. Winkler GSI, Darmstadt, Germany R. Maier, D. Prasuhn FZJ, Jülich, Germany
	Funding: Supported by the BMBF and state of Hessen The accelerators of the facility for Antiproton and Ion Research – FAIR are designed to deliver stable and rare isotope beams covering a huge range of intensities and beam energies. The ion and antiproton beams for the experiments will have highest beam quality for cutting edge physics to be conducted within the four research pillars CBM, NuSTAR, APPA and PANDA. The challenges of the accelerator facility to be established are related to the systems comprising magnets, cryo technology, rf-technology, vacuum etc. FAIR will employ heavy ion synchrotrons for highest intensities, antiproton and rare isotope production stations, high resolution separators and several storage rings where beam cooling can be applied. Intense work on test infrastructure for the huge number of superconducting magnets of the FAIR machines is ongoing at GSI and several partner labs. In addition, the GSI accelerator facility is being prepared to serve as injector for the FAIR accelerators. As the construction of the FAIR facility and procurement has started, an overview of the designs, procurements status and infrastructure preparation will be provided.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-WEPRO060
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WEPME063	Pulsed Low Level Baseband RF Control of CH-Cavities for p-Linac at FAIR	controls, detector, linac, proton	2421
	P. Nonn, U. Bonnes, C. Burandt, F. Hug, N. Pietralla TU Darmstadt, Darmstadt, Germany H. Klingbeil, G. Schreiber, W. Vinzenz GSI, Darmstadt, Germany H. Klingbeil TEMF, TU Darmstadt, Darmstadt, Germany
	Funding: This project was supported by the BMBF under grant No. 05P09RDRB5 and by the Helmholtz International Center for FAIR (HIC for FAIR) funded by the State of Hesse within its LOEWE initiative. At the Facility for Antiproton and Ion Research (FAIR) in Darmstadt, Germany a high intensity antiproton beam will be produced. To provide the necessary 70 mA proton beam a dedicated proton linac (p-Linac) is under construction. The main acceleration will be provided by 9 novel CH-type cavities, of which 6 will be coupled in pairs to share the same klystron. To test the rf properties of these novel cavities, a test stand is under construction. An rf control system for the pulsed operation of these cavities has been developed at TU Darmstadt. It is based upon the digital cw rf control that is successfully in operation as part of the S-DALINAC at IKP Darmstadt. The latest developments will be presented.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-WEPME063
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THPME135	Simulations of the Ion Spatial Distribution in a Gas-Curtain Based Beam Profile Monitor	ion, extraction, simulation, electron	3563
	B.B.D. Lomberg, A. Jeff, V. Tzoganis, C.P. Welsch Cockcroft Institute, Warrington, Cheshire, United Kingdom A. Jeff, B.B.D. Lomberg, V. Tzoganis, C.P. Welsch The University of Liverpool, Liverpool, United Kingdom A. Jeff CERN, Geneva, Switzerland V. Tzoganis RIKEN Nishina Center, Wako, Japan
	Funding: Work supported by the EU under grant agreement 215080 and 289485, HGF and GSI under contract VH-HG-328, the STFC Cockcroft Institute Core Grant No. ST/G008248/1, and a RIKEN-Liverpool studentship. A gas-jet monitor has been developed and commissioned by the QUASAR Group at the Cockcroft Institute, UK. It is designed to measure the transverse profile of a beam by crossing it with a neutral supersonic gas-jet. An array of high voltage electrodes is used to extract ions from the region where the beam and gas-jet interact. These ions first hit a micro-channel plate (MCP) and are then imaged through a phosphor screen and a CCD camera. It is important to understand and characterise the measured ion distribution in order to extract the beam profile. Therefore, numerical investigations using the commercial COMSOL and OPERA codes were carried out benchmarking profile measurements obtained from a low energy electron beam. This paper presents results from these studies. It compares measurements based on the interaction of the primary beam with the residual gas or the ultra-cold gas curtain, and discusses the comparisons of simulated profiles and extraction field configurations on the measured profile.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPME135
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THPME176	CERN Antiproton Decelerator Beam Instrumentation for the ELENA Era	pick-up, operation, instrumentation, electron	3684
	M. Ludwig, L. Bojtár, M.F. Fernandes, M. Gąsior, L. Søby, G. Tranquille CERN, Geneva, Switzerland
	CERN is currently constructing an Extra Low ENergy Antiproton ring (ELENA), which will allow the further deceleration of antiprotons from the currently exploited Antiproton Decelerator (AD). In order to meet the challenges of ELENA the beam instrumentation systems of the CERN AD are being consolidated and upgraded. An updated controls architecture with a more flexible timing system needs to be adopted and obsolete systems must be replaced. This paper presents the status and plans for improved performance and measurement availability of the AD beam instrumentation with a decreased risk of failure.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPME176
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Paper

Title

Other Keywords

Page

MOPRO036

Beam Life Time and Stability Studies for ELENA

electron, emittance, simulation, vacuum

154

J. Resta-López, O. Karamyshev, D. Newton, C.P. Welsch
Cockcroft Institute, Warrington, Cheshire, United Kingdom
O. Karamyshev, D. Newton, C.P. Welsch
The University of Liverpool, Liverpool, United Kingdom
J. Resta-López
IFIC, Valencia, Spain

Funding: Work supported by the EU under Grant Agreement 624854 and the STFC Cockcroft Institute Core Grant No. ST/G008248/1.
The Extremely Low ENergy Antiproton ring (ELENA) is a small synchrotron equipped with an electron cooler, which shall be constructed at CERN to decelerate antiprotons to energies as low as 100 keV. At such low energies it is very important to carefully take contributions from electron cooling and heating effects (e.g. on the residual gas) into account. Detailed investigations into the ion kinetics under consideration of effects from electron cooling and scattering on the residual gas have been carried out using the BETACOOL code. In this contribution a consistent explanation of the different physical effects acting on the beam in ELENA is given. Beam lifetime, equilibrium momentum spread and emittance are all estimated based on numerical simulations. Finally, optimum machine settings are presented as a result of optimization studies.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-MOPRO036

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MOPME066

Development of 400 kA Pulsed Power Supply for Magnetic Horn at FAIR Antiproton Target

radiation, operation, power-supply, coupling

517

S.S. Mohite, R. Hettinger, K. Knie, I.J. Petzenhauser
GSI, Darmstadt, Germany

This report presents an overview of the magnetic horn and its pulsed power system at the upcoming FAIR (Facility for Antiproton and Ion Research) complex at GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, Germany. In the planned antiproton (pbar) separator scheme a magnetic horn will be used as a device for collection and focusing of highly divergent antiprotons emerging from the target with energies around 3 GeV and within a cone of about 80 mrad .To achieve the desired focusing effect, the horn needs to be powered with a current pulse of 400 kA peak amplitude at the same repetition rate as the primary proton beam, i.e. 0.1 Hz. In future, operation up to 0.2 Hz is planned without major design alterations. Due to civil construction and radiation protection limitations, possible technical realization of this system has some key design issues. The aim is to develop a reliable and efficient magnetic horn system for effective focusing of antiprotons by producing a very strong pulsed magnetic field.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-MOPME066

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MOPRI067

Beam Cooling Systems and Activities at GSI and FAIR

electron, experiment, ion, pick-up

757

C. Dimopoulou
GSI, Darmstadt, Germany

Efficient and versatile beam cooling (electron and stochastic cooling) has been an indispensable ingredient for beam preparation and physics experiments at the GSI accelerator complex. The hot secondary beams emerging from the production targets can hardly be used, unless they are cooled. Beam stacking of low-abundant species relies on cooling. Cooling enables high-precision experiments with stored beams, counteracts the heating during internal target operation and controls decelerated beams. New challenges lie ahead within the FAIR project like (i) the ongoing integration downstream of the ESR of the low-energy CRYRING with its electron cooler, (ii) the developments for the demanding CR stochastic cooling system, (iii) the stacking scenarios with RF and stochastic cooling in the HESR/RESR. The function and parameters of the existing and future beam cooling systems are summarized. We report on the latest hardware developments as well as on improvements of the controls and operation software. Recent highlights and results from beam manipulations with cooling at GSI are shown. In focus are those benchmarking experiments, where the concepts for the new FAIR systems are verified.
C. Dimopoulou on behalf of the GSI Beam Cooling Department, of the GSI Stored Beams Division and of the FAIR Project Team.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-MOPRI067

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TUOAA01

Progress Towards Doubling the Beam Power at Fermilab's Accelerator Complex

booster, target, operation, proton

904

I. Kourbanis
Fermilab, Batavia, Illinois, USA

Funding: Work supported by the Fermi Research Alliance under contract to the U.S. Department of Energy.
After a 16 month shutdown to reconfigure the Fermilab Accelerators for high power operations, the Fermilab Accelerator Complex is again providing beams for numerous Physics Experiments. By using the Recycler to slip stack protons while the Main Injector is ramping, the beam power at 120 GeV can reach 700 KW, a factor of 2 increase. The progress towards doubling the Fermilab's Accelerator complex beam power will be presented.

Slides TUOAA01 [7.059 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUOAA01

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TUOAA03

Extra Low ENergy Antiproton ring ELENA: From the Conception to the Implementation Phase

experiment, electron, emittance, extraction

910

C. Carli, W. Bartmann, P. Belochitskii, H. Breuker, F. Butin, T. Eriksson, S. Maury, S. Pasinelli, G. Tranquille
CERN, Geneva, Switzerland
W. Oelert
Johannes Gutenberg University Mainz, Institut für Physik, Mainz, Germany

The Extra Low Energy Antiproton ring (ELENA) is a CERN project aiming at constructing a small 30 m circumference synchrotron to further decelerate antiprotons from the Antiproton Decelerator AD from 5.3 MeV to 100 keV. Controlled deceleration in a synchrotron equipped with an electron cooler to reduce emittances in all three planes will allow the existing AD experiments to increase substantially their antiproton capture efficiencies and render new experiments possible. The ELENA design is now well advanced and the project is moving to the implementation phase. Component design and construction are taking place at present for installation foreseen during the second half of 2015 and beginning of 2016 followed by ring commissioning until the end of 2016. New electrostatic transfer lines to the experiments will be installed and commissioned during the first half of 2017 followed by the first physics operation with ELENA. Basic limitations like Intra Beam Scattering limiting the emittances obtained under electron cooling and direct space charge effects will be reviewed and the status of the project will be reported.

Slides TUOAA03 [4.963 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUOAA03

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TUPRO041

Status of Ion-optical Design of the Collector Ring

optics, quadrupole, injection, kicker

1114

O.E. Gorda, A. Dolinskyy, S.A. Litvinov
GSI, Darmstadt, Germany
D.E. Berkaev, I. Koop, P.Yu. Shatunov, D.B. Shwartz
BINP SB RAS, Novosibirsk, Russia

The Collector Ring at FAIR will be used for fast cooling of hot antiproton or ion beams. The ring layout as well as the injection and extraction scheme have been modified during the latest design stage. In this paper, we report on the present status of the ion-optical properties of the machine.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRO041

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TUPRO106

Status of the ELENA Magnet System

quadrupole, dipole, simulation, operation

1295

D. Schoerling
CERN, Geneva, Switzerland

ELENA, the Extra Low ENergy Antiproton ring, will be a CERN facility with the purpose to deliver antiprotons at lowest energies aiming to enhance the study of antimatter. It will be a hexagonal shaped ring with a circumference of about 30 m decelerating antiprotons from energies of 5.3 MeV to 100 keV. Due to the extra-low beam rigidity the design of the magnet system is especially challenging because even small fields, for example arising from residual magnetization and hysteresis, will have a major impact both on the beam trajectory and beam dynamics. In this paper the design approach for such an extra-low beam rigidity magnet system is presented. The main challenges are outlined and solutions for the design of the magnet system are discussed.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRO106

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TUPRI028

Review of Rest Gas Interaction at Very Low Energies applied to the Extra Low ENergy Antiproton ring ELENA

scattering, emittance, ion, electron

1621

C. Carli, T.L. Rijoff
CERN, Geneva, Switzerland
O. Karamyshev, C.P. Welsch
Cockcroft Institute, Warrington, Cheshire, United Kingdom
O. Karamyshev, C.P. Welsch
The University of Liverpool, Liverpool, United Kingdom

The Extremely Low ENergy Antiproton ring (ELENA) is a small synchrotron equipped with an electron cooler, which shall be constructed at CERN to decelerate antiprotons to energies as low as 100 keV. Scattering of beam particles on rest gas molecules may have a detrimental effect at such low energies and leads to stringent vacuum requirements. Within this contribution scattering of the stored beam on rest gas molecules is discussed for very low beam energies. It is important to carefully distinguish between antiprotons scattered out of the acceptance and lost, and those remaining inside the aperture to avoid overestimation of emittance blow-up. Furthermore, many antiprotons do not interact at all during the time they are stored in ELENA and hence this is not a multiple scattering process

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRI028

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WEPRO060

Status of the FAIR Accelerator Facility

ion, dipole, target, synchrotron

2084

O.K. Kester, W.A. Barth, A. Dolinskyy, F. Hagenbuck, K. Knie, H. Reich-Sprenger, H. Simon, P.J. Spiller, U. Weinrich, M. Winkler
GSI, Darmstadt, Germany
R. Maier, D. Prasuhn
FZJ, Jülich, Germany

Funding: Supported by the BMBF and state of Hessen
The accelerators of the facility for Antiproton and Ion Research – FAIR are designed to deliver stable and rare isotope beams covering a huge range of intensities and beam energies. The ion and antiproton beams for the experiments will have highest beam quality for cutting edge physics to be conducted within the four research pillars CBM, NuSTAR, APPA and PANDA. The challenges of the accelerator facility to be established are related to the systems comprising magnets, cryo technology, rf-technology, vacuum etc. FAIR will employ heavy ion synchrotrons for highest intensities, antiproton and rare isotope production stations, high resolution separators and several storage rings where beam cooling can be applied. Intense work on test infrastructure for the huge number of superconducting magnets of the FAIR machines is ongoing at GSI and several partner labs. In addition, the GSI accelerator facility is being prepared to serve as injector for the FAIR accelerators. As the construction of the FAIR facility and procurement has started, an overview of the designs, procurements status and infrastructure preparation will be provided.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-WEPRO060

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WEPME063

Pulsed Low Level Baseband RF Control of CH-Cavities for p-Linac at FAIR

controls, detector, linac, proton

2421

P. Nonn, U. Bonnes, C. Burandt, F. Hug, N. Pietralla
TU Darmstadt, Darmstadt, Germany
H. Klingbeil, G. Schreiber, W. Vinzenz
GSI, Darmstadt, Germany
H. Klingbeil
TEMF, TU Darmstadt, Darmstadt, Germany

Funding: This project was supported by the BMBF under grant No. 05P09RDRB5 and by the Helmholtz International Center for FAIR (HIC for FAIR) funded by the State of Hesse within its LOEWE initiative.
At the Facility for Antiproton and Ion Research (FAIR) in Darmstadt, Germany a high intensity antiproton beam will be produced. To provide the necessary 70 mA proton beam a dedicated proton linac (p-Linac) is under construction. The main acceleration will be provided by 9 novel CH-type cavities, of which 6 will be coupled in pairs to share the same klystron. To test the rf properties of these novel cavities, a test stand is under construction. An rf control system for the pulsed operation of these cavities has been developed at TU Darmstadt. It is based upon the digital cw rf control that is successfully in operation as part of the S-DALINAC at IKP Darmstadt. The latest developments will be presented.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-WEPME063

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THPME135

Simulations of the Ion Spatial Distribution in a Gas-Curtain Based Beam Profile Monitor

ion, extraction, simulation, electron

3563

B.B.D. Lomberg, A. Jeff, V. Tzoganis, C.P. Welsch
Cockcroft Institute, Warrington, Cheshire, United Kingdom
A. Jeff, B.B.D. Lomberg, V. Tzoganis, C.P. Welsch
The University of Liverpool, Liverpool, United Kingdom
A. Jeff
CERN, Geneva, Switzerland
V. Tzoganis
RIKEN Nishina Center, Wako, Japan

Funding: Work supported by the EU under grant agreement 215080 and 289485, HGF and GSI under contract VH-HG-328, the STFC Cockcroft Institute Core Grant No. ST/G008248/1, and a RIKEN-Liverpool studentship.
A gas-jet monitor has been developed and commissioned by the QUASAR Group at the Cockcroft Institute, UK. It is designed to measure the transverse profile of a beam by crossing it with a neutral supersonic gas-jet. An array of high voltage electrodes is used to extract ions from the region where the beam and gas-jet interact. These ions first hit a micro-channel plate (MCP) and are then imaged through a phosphor screen and a CCD camera. It is important to understand and characterise the measured ion distribution in order to extract the beam profile. Therefore, numerical investigations using the commercial COMSOL and OPERA codes were carried out benchmarking profile measurements obtained from a low energy electron beam. This paper presents results from these studies. It compares measurements based on the interaction of the primary beam with the residual gas or the ultra-cold gas curtain, and discusses the comparisons of simulated profiles and extraction field configurations on the measured profile.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPME135

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THPME176

CERN Antiproton Decelerator Beam Instrumentation for the ELENA Era

pick-up, operation, instrumentation, electron

3684

M. Ludwig, L. Bojtár, M.F. Fernandes, M. Gąsior, L. Søby, G. Tranquille
CERN, Geneva, Switzerland

CERN is currently constructing an Extra Low ENergy Antiproton ring (ELENA), which will allow the further deceleration of antiprotons from the currently exploited Antiproton Decelerator (AD). In order to meet the challenges of ELENA the beam instrumentation systems of the CERN AD are being consolidated and upgraded. An updated controls architecture with a more flexible timing system needs to be adopted and obsolete systems must be replaced. This paper presents the status and plans for improved performance and measurement availability of the AD beam instrumentation with a decreased risk of failure.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPME176

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