IPAC2015 - List of Keywords (antiproton)

Paper	Title	Other Keywords	Page
MOPJE043	Design and Optimization of Electrostatic Deflectors for ELENA	focusing, vacuum, alignment, simulation	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	experiment, quadrupole, optics, simulation	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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MOPTY056	Elena Orbit and Schottky Measurement Systems	pick-up, FPGA, hardware, diagnostics	1061
	L. Søby, M.E. Angoletta, R. Marco-Hernandez, J.C. Molendijk, F. Pedersen, J. Sanchez-Quesada CERN, Geneva, Switzerland M. Bau University of Brescia, Brescia, Italy M. Ferrari, V. Ferrari Università di Brescia, Brescia, Italy
	A new Extra Low ENergy Antiproton ring (ELENA) is under construction at CERN to further decelerate the antiprotons from the existing Antiproton Decelerator (AD) to an energy of just 100 keV. This contribution will describe the beam position system foreseen for ELENA and how it can be adapted for Schottky measurements. The orbit system being developed is based on electrostatic shoebox BPMs fitted with Digital Down Converters (DDC). The main requirement is to measure complete orbits every 20 ms with a resolution of 0.1mm for intensities in the range of 1-3x10⁷ charges. The pick-up signals will, after amplification with a low noise charge amplifier, be down-mixed to baseband for position computation. In order to provide the longitudinal Schottky diagnostics of un-bunched beams, the 20 BPM sum signals will, after time off flight corrections, be added digitally to give an expected S/N increase of 13 dB compared to using a single electrostatic pick-up.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-MOPTY056
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TUBB2	The Accelerator Facility of the Facility for Antiproton and Ion Research	ion, target, proton, heavy-ion	1343
	P.J. Spiller, F. Becker, A. Dolinskyy, L. Groening, O.K. Kester, K. Knie, H. Reich-Sprenger, W. Vinzenz, M. Winkler GSI, Darmstadt, Germany D. Prasuhn FZJ, Jülich, Germany
	The accelerators of the Facility for Antiproton and Ion Research – FAIR are under construction. The sophisticated system of accelerators is designed to produce stable and secondary beams with a significant variety of intensities and beam energies. FAIR will explore the intensity frontier of heavy ion accelerators and the beams for the experiments will have highest beam quality for cutting edge physics to be conducted. The main driver accelerator of FAIR will be the SIS100 synchrotron. In order to produce the intense rare isotope beams (RIB) at FAIR, a unique superconducting fragment separator is under construction. A system of storage rings will collect and cool secondary particles from the FAIR. 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 accelerators and the procurement has started, an overview of the designs, procurements plans and infrastructure preparation can be provided.
	Slides TUBB2 [4.653 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-TUBB2
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WEAB3	Intra-beam Scattering Effects in ELENA	emittance, electron, scattering, simulation	2458
	J. Resta-López, J.R. Hunt, C.P. Welsch Cockcroft Institute, Warrington, Cheshire, United Kingdom J.R. Hunt, J. Resta-López, C.P. Welsch The University of Liverpool, Liverpool, United Kingdom
	Funding: Work supported by the EU under Grant Agreement 624854 and the STFC Cockcroft Institute core Grant No. ST/G008248/1. Intra-Beam Scattering (IBS) is one of the main limiting processes for the performance of low energy ion storage rings, such as the Extra Low ENergy Antiproton ring (ELENA) that is being constructed at CERN. IBS effects limit the achievable equilibrium 6D beam phase space volume during the cooling process, as well as the stored beam intensity. In this contribution we analyze the IBS effects on the beam dynamics of the ELENA ring in detail. Numerical simulations using the codes BETACOOL and MAD-X have been performed to compute the beam life time and the equilibrium phase space parameters with electron cooling in the presence of IBS.
	Slides WEAB3 [6.222 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-WEAB3
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WEPMA018	Status of the Ring RF Systems for FAIR	cavity, operation, ion, PLC	2789
	M. Frey, R. Balß, C. Christoph, O. Disser, G. Fleischmann, U. Hartel, P. Hülsmann, S. Jatta, A. Klaus, H. Klingbeil, H.G. König, U. Laier, D.E.M. Lens, D. Mondry, K.-P. Ningel, H. Richter, S. Schäfer, C. Thielmann, T. Winnefeld, B. Zipfel GSI, Darmstadt, Germany K. Groß, H. Klingbeil TEMF, TU Darmstadt, Darmstadt, Germany
	For the FAIR (Facility for Antiproton and Ion Research) synchrotron SIS100 and the storage ring CR (Collector Ring), different RF cavity systems are currently being realized. In addition to the standard RF bucket generation and acceleration, these ring RF systems also allow more complex beam manipulations such as barrier bucket operation or bunch rotation in phase space. Depending on their purpose, the cavities are either loaded with ferrite material or with MA (Magnetic Alloy) ring cores. Independent of the type of cavity, a complete cavity system consists of the cavity itself, a tetrode-based power amplifier, a solid-state pre-amplifier, a supply unit including PLC (Programmable Logic Control), and an RF control system (so-called LLRF, low level RF system). In this contribution, the different systems are described, and their current status is presented.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-WEPMA018
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WEPHA010	The Vacuum System of the Extra-Low Energy Antiproton Decelerator ELENA at CERN	vacuum, dipole, ion, electron	3119
	R. Kersevan CERN, Geneva, Switzerland
	The Extra-Low ENergy Antiproton decelerator (ELENA) project is under way since 2011. In the past 3 years, it has considerably evolved into a detailed design for the ring and the transfer lines. It is a small machine, ~30 m in circumference, with a rather tight specification for the average pressure seen by the anti-proton beams injected by the anti-proton decelerator (AD). The average pressure in ELENA must be limited to 4x10^-12 mbar (H2-equivalent) in order to limit the charge-exchange losses during the rather long deceleration process (several tens of seconds), during which the energy of the beam is reduced and the electron-cooler is used twice in order to decrease the transverse emittance of the anti-proton beam. This paper will discuss the design of the chambers of the injection line, extraction line and the ring. It will also mention the actual status of the vacuum system for the transfer lines to the experiments, LNE, which are under finalisation. The results of detailed 3D simulations made with the test-particle montecarlo code Molflow+ will be discussed, alongside with the choice for the pumping system, mainly distributed NEG-coatings and integrated NEG/ion-pumps.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-WEPHA010
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THPF029	Preparation of an Ion Source for an Extra Low Energy Synchrotron	ion, extraction, ion-source, electron	3755
	R. Gebel, O. Felden, R. Maier, S. Mey, D. Prasuhn FZJ, Jülich, Germany
	Funding: The work is supported within the framework of the Helmholtz Association’s Accelerator Research and Development (ARD) program. ELENA* is a compact ring for cooling and further deceleration of 5.3 MeV antiprotons delivered by the CERN Antiproton Decelerator (AD) down to 100 keV. Because of the long AD cycle of 100 s, it is foreseen to use a source for protons and H⁻ with a kinetic energy of 100 keV for commissioning and start-ups. The source, designed to provide 0.2 to 2.0μsec pulses with 3x10⁷ ions, is based on a proven multicusp volume source used at the COSY/Jülich** injector cyclotron. The source and its auxiliaries were refurbished, upgraded to ±100 keV operation at the Forschungszentrum Jülich and have been set in operation at CERN in April 2015 for first tests of new equipments. * V. Chohan [ed.], ELENA ring and its Transfer Lines – Design Report Geneva 2014, DOI 10.5170/CERN-2014-002 ** R. Maier Nucl. Instr. Meth. A 390 (1997) P.1.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-THPF029
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THPF030	Antiproton Acceleration and Deceleration in the HESR	target, lattice, acceleration, dipole	3758
	B. Lorentz, T. Katayama, A. Lehrach, R. Maier, D. Prasuhn, R. Stassen, H. Stockhorst, R. Tölle FZJ, Jülich, Germany
	The High Energy Storage Ring (HESR) is a part of the future Facility for Antiproton and Ion Research (FAIR) in Darmstadt. The ring is used for hadron physics experiments with a pellet target and the PANDA detector, and will supply antiprotons of momenta from 1.5 GeV/c to 15 GeV/c. To cover the whole energy range a flexible adjustment of transition energy and the corresponding gamma-t value is foreseen. For Injection and Accumulation of Antiprotons delivered from the CR at a momentum of 3.8 GeV/c (gamma=4.2), the HESR optics will be tuned to gamma-t=6.2. For deceleration down to a momentum of 1.5 GeV/c this optic is suitable as well. Stochastic cooling at an intermediate energy is required to avoid beam losses caused by adiabatic growth of the beam during deceleration. For acceleration to 8 GeV/c (gamma=8.6) the optics will be changed after accumulation of the antiproton beam to gamma-t=14.6. For momenta higher than 8 GeV/c the beam will be debunched at 8 GeV/c, optics will be changed to gamma-t=6.2, and after adiabatic rebunching the beam will be accelerated to 15 GeV/c (gamma=16). Simulations show the feasibility of the described procedures with practically no beam losses.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-THPF030
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THPF034	Injection Kicker for HESR at FAIR using Semi-Conductor Switches	injection, kicker, vacuum, impedance	3770
	R. Tölle, N. Bongers, F.M. Esser, R. Gebel, S. Hamzic, H. Jagdfeld, F. Klehr, B. Laatsch, L. Reifferscheidt, M. Retzlaff, L. Semke, H. Soltner, H. Stockhorst FZJ, Jülich, Germany S. Antoine, W. Beeckman, P. Bocher, O. Cosson, P. Jivkov, D. Ramauge Sigmaphi, Vannes, France
	The High Energy Storage Ring for Antiprotons is going to be built at FAIR in Darmstadt on the extended GSI campus. It will receive the antiprotons via the Collector Ring (CR). Using a barrier bucket, the circulating particles will be compressed into one half of the circumference. New particles have to be injected into the remaining half. Thus rise and fall time must not exceed 220 ns each with a flat top of 500 ns. A kick angle of 6.4 mrad is required at 13 Tm magnetic rigidity. The system must allow pole reversal for injection of positively charged particles. With a voltage lower than 40 kV a semi-conductor based pulser is going to be realized. Boundary conditions and the status of preparatory work are described. Simulation results and available measurements are presented.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-THPF034
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THPF107	Quality and Stability Studies of the Beams in the ELENA Ring Transfer Lines	quadrupole, simulation, lattice, experiment	3966
	J.R. Hunt, O. Karamyshev, J. Resta-López, C.P. Welsch The University of Liverpool, Liverpool, United Kingdom J.R. Hunt, O. Karamyshev, J. Resta-López, C.P. Welsch Cockcroft Institute, Warrington, Cheshire, United Kingdom
	Funding: Work supported by the EU under Grant Agreement 624854 and the STFC Cockcroft Institute core Grant No. ST/G008248/1. The Extra Low ENergy Antiproton (ELENA) ring will provide seven different experiments at CERN with cooled beams of low energy (~100 keV) antiprotons. As a result, a system of transfer lines is being designed to ensure that each experiment receives a beam with its required properties. In this contribution, particle tracking simulations using MADX are performed to explore the effects on the beam quality and orbit stability of different lattice imperfections, such as element misalignment, electric field and matching errors. The tolerances on the actual values of these quantities are obtained as a guide for the construction of the transfer lines.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-THPF107
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Paper

Title

Other Keywords

Page

MOPJE043

Design and Optimization of Electrostatic Deflectors for ELENA

focusing, vacuum, alignment, simulation

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

experiment, quadrupole, optics, simulation

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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MOPTY056

Elena Orbit and Schottky Measurement Systems

pick-up, FPGA, hardware, diagnostics

1061

L. Søby, M.E. Angoletta, R. Marco-Hernandez, J.C. Molendijk, F. Pedersen, J. Sanchez-Quesada
CERN, Geneva, Switzerland
M. Bau
University of Brescia, Brescia, Italy
M. Ferrari, V. Ferrari
Università di Brescia, Brescia, Italy

A new Extra Low ENergy Antiproton ring (ELENA) is under construction at CERN to further decelerate the antiprotons from the existing Antiproton Decelerator (AD) to an energy of just 100 keV. This contribution will describe the beam position system foreseen for ELENA and how it can be adapted for Schottky measurements. The orbit system being developed is based on electrostatic shoebox BPMs fitted with Digital Down Converters (DDC). The main requirement is to measure complete orbits every 20 ms with a resolution of 0.1mm for intensities in the range of 1-3x10⁷ charges. The pick-up signals will, after amplification with a low noise charge amplifier, be down-mixed to baseband for position computation. In order to provide the longitudinal Schottky diagnostics of un-bunched beams, the 20 BPM sum signals will, after time off flight corrections, be added digitally to give an expected S/N increase of 13 dB compared to using a single electrostatic pick-up.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-MOPTY056

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TUBB2

The Accelerator Facility of the Facility for Antiproton and Ion Research

ion, target, proton, heavy-ion

1343

P.J. Spiller, F. Becker, A. Dolinskyy, L. Groening, O.K. Kester, K. Knie, H. Reich-Sprenger, W. Vinzenz, M. Winkler
GSI, Darmstadt, Germany
D. Prasuhn
FZJ, Jülich, Germany

The accelerators of the Facility for Antiproton and Ion Research – FAIR are under construction. The sophisticated system of accelerators is designed to produce stable and secondary beams with a significant variety of intensities and beam energies. FAIR will explore the intensity frontier of heavy ion accelerators and the beams for the experiments will have highest beam quality for cutting edge physics to be conducted. The main driver accelerator of FAIR will be the SIS100 synchrotron. In order to produce the intense rare isotope beams (RIB) at FAIR, a unique superconducting fragment separator is under construction. A system of storage rings will collect and cool secondary particles from the FAIR. 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 accelerators and the procurement has started, an overview of the designs, procurements plans and infrastructure preparation can be provided.

Slides TUBB2 [4.653 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-TUBB2

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WEAB3

Intra-beam Scattering Effects in ELENA

emittance, electron, scattering, simulation

2458

J. Resta-López, J.R. Hunt, C.P. Welsch
Cockcroft Institute, Warrington, Cheshire, United Kingdom
J.R. Hunt, J. Resta-López, C.P. Welsch
The University of Liverpool, Liverpool, United Kingdom

Funding: Work supported by the EU under Grant Agreement 624854 and the STFC Cockcroft Institute core Grant No. ST/G008248/1.
Intra-Beam Scattering (IBS) is one of the main limiting processes for the performance of low energy ion storage rings, such as the Extra Low ENergy Antiproton ring (ELENA) that is being constructed at CERN. IBS effects limit the achievable equilibrium 6D beam phase space volume during the cooling process, as well as the stored beam intensity. In this contribution we analyze the IBS effects on the beam dynamics of the ELENA ring in detail. Numerical simulations using the codes BETACOOL and MAD-X have been performed to compute the beam life time and the equilibrium phase space parameters with electron cooling in the presence of IBS.

Slides WEAB3 [6.222 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-WEAB3

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WEPMA018

Status of the Ring RF Systems for FAIR

cavity, operation, ion, PLC

2789

M. Frey, R. Balß, C. Christoph, O. Disser, G. Fleischmann, U. Hartel, P. Hülsmann, S. Jatta, A. Klaus, H. Klingbeil, H.G. König, U. Laier, D.E.M. Lens, D. Mondry, K.-P. Ningel, H. Richter, S. Schäfer, C. Thielmann, T. Winnefeld, B. Zipfel
GSI, Darmstadt, Germany
K. Groß, H. Klingbeil
TEMF, TU Darmstadt, Darmstadt, Germany

For the FAIR (Facility for Antiproton and Ion Research) synchrotron SIS100 and the storage ring CR (Collector Ring), different RF cavity systems are currently being realized. In addition to the standard RF bucket generation and acceleration, these ring RF systems also allow more complex beam manipulations such as barrier bucket operation or bunch rotation in phase space. Depending on their purpose, the cavities are either loaded with ferrite material or with MA (Magnetic Alloy) ring cores. Independent of the type of cavity, a complete cavity system consists of the cavity itself, a tetrode-based power amplifier, a solid-state pre-amplifier, a supply unit including PLC (Programmable Logic Control), and an RF control system (so-called LLRF, low level RF system). In this contribution, the different systems are described, and their current status is presented.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-WEPMA018

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WEPHA010

The Vacuum System of the Extra-Low Energy Antiproton Decelerator ELENA at CERN

vacuum, dipole, ion, electron

3119

R. Kersevan
CERN, Geneva, Switzerland

The Extra-Low ENergy Antiproton decelerator (ELENA) project is under way since 2011. In the past 3 years, it has considerably evolved into a detailed design for the ring and the transfer lines. It is a small machine, ~30 m in circumference, with a rather tight specification for the average pressure seen by the anti-proton beams injected by the anti-proton decelerator (AD). The average pressure in ELENA must be limited to 4x10^-12 mbar (H2-equivalent) in order to limit the charge-exchange losses during the rather long deceleration process (several tens of seconds), during which the energy of the beam is reduced and the electron-cooler is used twice in order to decrease the transverse emittance of the anti-proton beam. This paper will discuss the design of the chambers of the injection line, extraction line and the ring. It will also mention the actual status of the vacuum system for the transfer lines to the experiments, LNE, which are under finalisation. The results of detailed 3D simulations made with the test-particle montecarlo code Molflow+ will be discussed, alongside with the choice for the pumping system, mainly distributed NEG-coatings and integrated NEG/ion-pumps.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-WEPHA010

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THPF029

Preparation of an Ion Source for an Extra Low Energy Synchrotron

ion, extraction, ion-source, electron

3755

R. Gebel, O. Felden, R. Maier, S. Mey, D. Prasuhn
FZJ, Jülich, Germany

Funding: The work is supported within the framework of the Helmholtz Association’s Accelerator Research and Development (ARD) program.
ELENA* is a compact ring for cooling and further deceleration of 5.3 MeV antiprotons delivered by the CERN Antiproton Decelerator (AD) down to 100 keV. Because of the long AD cycle of 100 s, it is foreseen to use a source for protons and H⁻ with a kinetic energy of 100 keV for commissioning and start-ups. The source, designed to provide 0.2 to 2.0μsec pulses with 3x10⁷ ions, is based on a proven multicusp volume source used at the COSY/Jülich** injector cyclotron. The source and its auxiliaries were refurbished, upgraded to ±100 keV operation at the Forschungszentrum Jülich and have been set in operation at CERN in April 2015 for first tests of new equipments.
* V. Chohan [ed.], ELENA ring and its Transfer Lines – Design Report
Geneva 2014, DOI 10.5170/CERN-2014-002
** R. Maier Nucl. Instr. Meth. A 390 (1997) P.1.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-THPF029

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THPF030

Antiproton Acceleration and Deceleration in the HESR

target, lattice, acceleration, dipole

3758

B. Lorentz, T. Katayama, A. Lehrach, R. Maier, D. Prasuhn, R. Stassen, H. Stockhorst, R. Tölle
FZJ, Jülich, Germany

The High Energy Storage Ring (HESR) is a part of the future Facility for Antiproton and Ion Research (FAIR) in Darmstadt. The ring is used for hadron physics experiments with a pellet target and the PANDA detector, and will supply antiprotons of momenta from 1.5 GeV/c to 15 GeV/c. To cover the whole energy range a flexible adjustment of transition energy and the corresponding gamma-t value is foreseen. For Injection and Accumulation of Antiprotons delivered from the CR at a momentum of 3.8 GeV/c (gamma=4.2), the HESR optics will be tuned to gamma-t=6.2. For deceleration down to a momentum of 1.5 GeV/c this optic is suitable as well. Stochastic cooling at an intermediate energy is required to avoid beam losses caused by adiabatic growth of the beam during deceleration. For acceleration to 8 GeV/c (gamma=8.6) the optics will be changed after accumulation of the antiproton beam to gamma-t=14.6. For momenta higher than 8 GeV/c the beam will be debunched at 8 GeV/c, optics will be changed to gamma-t=6.2, and after adiabatic rebunching the beam will be accelerated to 15 GeV/c (gamma=16). Simulations show the feasibility of the described procedures with practically no beam losses.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-THPF030

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THPF034

Injection Kicker for HESR at FAIR using Semi-Conductor Switches

injection, kicker, vacuum, impedance

3770

R. Tölle, N. Bongers, F.M. Esser, R. Gebel, S. Hamzic, H. Jagdfeld, F. Klehr, B. Laatsch, L. Reifferscheidt, M. Retzlaff, L. Semke, H. Soltner, H. Stockhorst
FZJ, Jülich, Germany
S. Antoine, W. Beeckman, P. Bocher, O. Cosson, P. Jivkov, D. Ramauge
Sigmaphi, Vannes, France

The High Energy Storage Ring for Antiprotons is going to be built at FAIR in Darmstadt on the extended GSI campus. It will receive the antiprotons via the Collector Ring (CR). Using a barrier bucket, the circulating particles will be compressed into one half of the circumference. New particles have to be injected into the remaining half. Thus rise and fall time must not exceed 220 ns each with a flat top of 500 ns. A kick angle of 6.4 mrad is required at 13 Tm magnetic rigidity. The system must allow pole reversal for injection of positively charged particles. With a voltage lower than 40 kV a semi-conductor based pulser is going to be realized. Boundary conditions and the status of preparatory work are described. Simulation results and available measurements are presented.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-THPF034

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THPF107

Quality and Stability Studies of the Beams in the ELENA Ring Transfer Lines

quadrupole, simulation, lattice, experiment

3966

J.R. Hunt, O. Karamyshev, J. Resta-López, C.P. Welsch
The University of Liverpool, Liverpool, United Kingdom
J.R. Hunt, O. Karamyshev, J. Resta-López, C.P. Welsch
Cockcroft Institute, Warrington, Cheshire, United Kingdom

Funding: Work supported by the EU under Grant Agreement 624854 and the STFC Cockcroft Institute core Grant No. ST/G008248/1.
The Extra Low ENergy Antiproton (ELENA) ring will provide seven different experiments at CERN with cooled beams of low energy (~100 keV) antiprotons. As a result, a system of transfer lines is being designed to ensure that each experiment receives a beam with its required properties. In this contribution, particle tracking simulations using MADX are performed to explore the effects on the beam quality and orbit stability of different lattice imperfections, such as element misalignment, electric field and matching errors. The tolerances on the actual values of these quantities are obtained as a guide for the construction of the transfer lines.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-THPF107

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