COOL2015 - List of Keywords (proton)

Paper	Title	Other Keywords	Page
MOXAUD02	Experimental Observation of Longitudinal Electron Cooling of DC and Bunched Proton Beam at 2425 MeV/c at COSY	electron, simulation, experiment, vacuum	10
	V.B. Reva, M.I. Bryzgunov, V.V. Parkhomchuk BINP SB RAS, Novosibirsk, Russia V. Kamerdzhiev, T. Katayama, R. Stassen, H. Stockhorst FZJ, Jülich, Germany
	The 2 MeV electron cooling system for COSY-Julich started operation in 2013 years. The cooling process was observed in the wide energy range of the electron beam from 100 keV to 908 keV. Vertical, horizontal and longitudinal cooling was tested at bunched and continuous beams. The cooler was operated with electron current up to 0.9 A. This report deals with the description of the experimental observation of longitudinal electron cooling of DC and bunched proton beam at 2425 MeV/c at COSY.
	Slides MOXAUD02 [10.860 MB]
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MOPF03	Electron Lenses and Cooling for the Fermilab Integrable Optics Test Accelerator	electron, optics, space-charge, lattice	32
	G. Stancari, A.V. Burov, V.A. Lebedev, S. Nagaitsev, E. Prebys, A. Valishev Fermilab, Batavia, Illinois, USA
	Funding: Fermilab is operated by Fermi Research Alliance, LLC, under Contract DE-AC02-07CH11359 with the US Department of Energy. Recently, the study of integrable Hamiltonian systems has led to nonlinear accelerator lattices with one or two transverse invariants and wide stable tune spreads. These lattices may drastically improve the performance of high-intensity machines, providing Landau damping to protect the beam from instabilities, while preserving dynamic aperture. The Integrable Optics Test Accelerator (IOTA) is being built at Fermilab to study these concepts with 150-MeV pencil electron beams (single-particle dynamics) and 2.5-MeV protons (dynamics with self fields). One way to obtain a nonlinear integrable lattice is by using the fields generated by a magnetically confined electron beam (electron lens) overlapping with the circulating beam. The required parameters are similar to the ones of existing devices. In addition, the electron lens will be used in cooling mode to control the brightness of the proton beam and to measure transverse profiles through recombination. More generally, it is of great interest to investigate whether nonlinear integrable optics allows electron coolers to exceed limitations set by both coherent or incoherent instabilities excited by space charge.
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MOPF12	N-body Code to Demonstrate Electron Cooling	electron, ion, booster, emittance	59
	S. Abeyratne, B. Erdelyi Northern Illinois University, DeKalb, Illinois, USA B. Erdelyi ANL, Argonne, USA
	In the Electron Ion Collider (EIC), the collision between the electron beam and the proton, or heavy ion, beam results in emittance growth of the proton beam. Electron cooling, where an electron beam and the proton beam co-propagate, is the desired cooling method to cool or mitigate the emittance growth of the proton beam. The pre-booster, the larger booster, and the collider ring in EIC are the major components that require electron cooling. To study the cooling effect, we previously proposed Particles' High order Adaptive Dynamics (PHAD) code that uses the Fast Multiple Method (FMM) to calculate the Coulomb interactions among charged particles. We further used the Strang splitting technique to improve the code's efficiency and used Picard iteration-based novel integrators to maintain very high accuracy. In this paper we explain how this code is used to treat relativistic particle collisions. We are able calculate the transverse emittances of protons and electrons in the cooling section while still maintaining high accuracy. This presentation will be an update on progress with the parallelization of the code and the current status of production runs.
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TUPF01	Cooling for a High Luminosity 100 TeV Proton Antiproton Collider	antiproton, collider, luminosity, quadrupole	97
	S.J. Oliveros, J.G. Acosta, L.M. Cremaldi, D.J. Summers UMiss, University, Mississippi, USA
	A 10³⁴ luminosity 100 TeV proton-antiproton collider is explored. The cross section for many high mass states is 10x higher in p-pbar than p-p collisions. Antiquarks for production can come directly from an antiproton rather than indirectly from gluon splitting. The higher cross sections reduce the synchrotron radiation in superconducting magnets and the vacuum system, because lower beam currents can produce the same rare event rates. Events are also more central, allowing a shorter detector with less space between quadrupole triplets and a smaller beta twiss for higher luminosity. To keep up with the antiproton burn rate, a Fermilab-like antiproton source would be adapted to disperse the beam into 12 different momentum channels, using electrostatic septa, to increase antiproton momentum capture 12x. At Fermilab, antiprotons were stochastically cooled in one debuncher and one accumulator ring. Because the stochastic cooling time scales as the number of particles, 12 independent cooling systems would be used, each one with one debuncher/momentum equalizer ring and two accumulator rings. One electron cooling ring would follow the stochastic cooling rings. Finally antiprotons in the collider ring would be recycled during runs without leaving the collider ring, by joining them to new bunches with snap bunch coalescence and longitudinal synchrotron damping.
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WEXAUD04	Electron Cooling at GSI and FAIR – Status and Latest Activities	electron, ion, experiment, power-supply	136
	J. Roßbach, C. Dimopoulou, M. Steck GSI, Darmstadt, Germany
	The status, function and operation parameters of the existing and future electron coolers at GSI and FAIR are presented. We report on the progress of the ongoing recommissioning of the former CRYRING storage ring with its electron cooler at GSI. First systematic results on the cooling of a 400 MeV proton beam during the last ESR beamtime are discussed. Motivated by the demands of the experiments on high stability, precise monitoring and even absolute determination of the velocity of the electrons i.e. the velocity of the electron- cooled ion beams, high precision measurements on the electron cooler voltage at the ESR were carried out towards the refurbishment of the main high-voltage supply of the cooler. Similar concepts are underway for the CRYRING cooler high-voltage system.
	Slides WEXAUD04 [23.579 MB]
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THWCR02	The SNS Laser Stripping Injection Experiment and its Implications on Beam Accumulation	laser, injection, emittance, experiment	140
	S.M. Cousineau, T.V. Gorlov, Y. Liu, A.A. Menshov, M.A. Plum, A. Rakhman ORNL, Oak Ridge, Tennessee, USA K. Aulenbacher IKP, Mainz, Germany
	The laser assisted H⁻ charge exchange concept is under development at the Spallation Neutron Source (SNS) as on option for replacing traditional carbon-based foil technology in future accelerators. A laser based stripping system has the potential to alleviate limiting issues with foil technology, paving the way for accumulation of much higher density proton beams. This paper discusses the advantages and limitations of a laser-based stripping system compared with traditional foil-based charge exchange systems for various beam accumulation scenarios, scaling from SNS experience with high power beam injection and calculations of laser stripping parameters. In addition, preparations for an experimental demonstration of laser assisted stripping for microsecond long 1 GeV, H⁻ beams are described.
	Slides THWCR02 [34.408 MB]
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THYAUD02	Front End and HFOFO Snake for a Muon Facility	solenoid, target, factory, collider	150
	D.V. Neuffer, Y.I. Alexahin Fermilab, Batavia, Illinois, USA
	Funding: Work supported by Contract No. De-AC02-07CH11359 with the U. S. Department of Energy A neutrino factory or muon collider requires the capture and cooling of a large number of muons. Scenarios for capture, bunching, phase-energy rotation and initial cooling of muonss produced from a proton source target have been developed for neutrino factory and Muon Collider designs. The baseline scenarios requires a drift section from the target, a bunching section and a phase-energy rotation section leading into the cooling channel. The currently preferred cooling channel design is an 'HFOFO Snake' configuration that cools both μ+ and μ- transversely and longitudinally. The status of the design is presented and variations are discussed.
	Slides THYAUD02 [4.191 MB]
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Paper

Title

Other Keywords

Page

MOXAUD02

Experimental Observation of Longitudinal Electron Cooling of DC and Bunched Proton Beam at 2425 MeV/c at COSY

electron, simulation, experiment, vacuum

10

V.B. Reva, M.I. Bryzgunov, V.V. Parkhomchuk
BINP SB RAS, Novosibirsk, Russia
V. Kamerdzhiev, T. Katayama, R. Stassen, H. Stockhorst
FZJ, Jülich, Germany

The 2 MeV electron cooling system for COSY-Julich started operation in 2013 years. The cooling process was observed in the wide energy range of the electron beam from 100 keV to 908 keV. Vertical, horizontal and longitudinal cooling was tested at bunched and continuous beams. The cooler was operated with electron current up to 0.9 A. This report deals with the description of the experimental observation of longitudinal electron cooling of DC and bunched proton beam at 2425 MeV/c at COSY.

Slides MOXAUD02 [10.860 MB]

Export •

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

MOPF03

Electron Lenses and Cooling for the Fermilab Integrable Optics Test Accelerator

electron, optics, space-charge, lattice

32

G. Stancari, A.V. Burov, V.A. Lebedev, S. Nagaitsev, E. Prebys, A. Valishev
Fermilab, Batavia, Illinois, USA

Funding: Fermilab is operated by Fermi Research Alliance, LLC, under Contract DE-AC02-07CH11359 with the US Department of Energy.
Recently, the study of integrable Hamiltonian systems has led to nonlinear accelerator lattices with one or two transverse invariants and wide stable tune spreads. These lattices may drastically improve the performance of high-intensity machines, providing Landau damping to protect the beam from instabilities, while preserving dynamic aperture. The Integrable Optics Test Accelerator (IOTA) is being built at Fermilab to study these concepts with 150-MeV pencil electron beams (single-particle dynamics) and 2.5-MeV protons (dynamics with self fields). One way to obtain a nonlinear integrable lattice is by using the fields generated by a magnetically confined electron beam (electron lens) overlapping with the circulating beam. The required parameters are similar to the ones of existing devices. In addition, the electron lens will be used in cooling mode to control the brightness of the proton beam and to measure transverse profiles through recombination. More generally, it is of great interest to investigate whether nonlinear integrable optics allows electron coolers to exceed limitations set by both coherent or incoherent instabilities excited by space charge.

Export •

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

MOPF12

N-body Code to Demonstrate Electron Cooling

electron, ion, booster, emittance

59

S. Abeyratne, B. Erdelyi
Northern Illinois University, DeKalb, Illinois, USA
B. Erdelyi
ANL, Argonne, USA

In the Electron Ion Collider (EIC), the collision between the electron beam and the proton, or heavy ion, beam results in emittance growth of the proton beam. Electron cooling, where an electron beam and the proton beam co-propagate, is the desired cooling method to cool or mitigate the emittance growth of the proton beam. The pre-booster, the larger booster, and the collider ring in EIC are the major components that require electron cooling. To study the cooling effect, we previously proposed Particles' High order Adaptive Dynamics (PHAD) code that uses the Fast Multiple Method (FMM) to calculate the Coulomb interactions among charged particles. We further used the Strang splitting technique to improve the code's efficiency and used Picard iteration-based novel integrators to maintain very high accuracy. In this paper we explain how this code is used to treat relativistic particle collisions. We are able calculate the transverse emittances of protons and electrons in the cooling section while still maintaining high accuracy. This presentation will be an update on progress with the parallelization of the code and the current status of production runs.

Export •

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

TUPF01

Cooling for a High Luminosity 100 TeV Proton Antiproton Collider

antiproton, collider, luminosity, quadrupole

97

S.J. Oliveros, J.G. Acosta, L.M. Cremaldi, D.J. Summers
UMiss, University, Mississippi, USA

A 10³⁴ luminosity 100 TeV proton-antiproton collider is explored. The cross section for many high mass states is 10x higher in p-pbar than p-p collisions. Antiquarks for production can come directly from an antiproton rather than indirectly from gluon splitting. The higher cross sections reduce the synchrotron radiation in superconducting magnets and the vacuum system, because lower beam currents can produce the same rare event rates. Events are also more central, allowing a shorter detector with less space between quadrupole triplets and a smaller beta twiss for higher luminosity. To keep up with the antiproton burn rate, a Fermilab-like antiproton source would be adapted to disperse the beam into 12 different momentum channels, using electrostatic septa, to increase antiproton momentum capture 12x. At Fermilab, antiprotons were stochastically cooled in one debuncher and one accumulator ring. Because the stochastic cooling time scales as the number of particles, 12 independent cooling systems would be used, each one with one debuncher/momentum equalizer ring and two accumulator rings. One electron cooling ring would follow the stochastic cooling rings. Finally antiprotons in the collider ring would be recycled during runs without leaving the collider ring, by joining them to new bunches with snap bunch coalescence and longitudinal synchrotron damping.

Export •

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

WEXAUD04

Electron Cooling at GSI and FAIR – Status and Latest Activities

electron, ion, experiment, power-supply

136

J. Roßbach, C. Dimopoulou, M. Steck
GSI, Darmstadt, Germany

The status, function and operation parameters of the existing and future electron coolers at GSI and FAIR are presented. We report on the progress of the ongoing recommissioning of the former CRYRING storage ring with its electron cooler at GSI. First systematic results on the cooling of a 400 MeV proton beam during the last ESR beamtime are discussed. Motivated by the demands of the experiments on high stability, precise monitoring and even absolute determination of the velocity of the electrons i.e. the velocity of the electron- cooled ion beams, high precision measurements on the electron cooler voltage at the ESR were carried out towards the refurbishment of the main high-voltage supply of the cooler. Similar concepts are underway for the CRYRING cooler high-voltage system.

Slides WEXAUD04 [23.579 MB]

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THWCR02

The SNS Laser Stripping Injection Experiment and its Implications on Beam Accumulation

laser, injection, emittance, experiment

140

S.M. Cousineau, T.V. Gorlov, Y. Liu, A.A. Menshov, M.A. Plum, A. Rakhman
ORNL, Oak Ridge, Tennessee, USA
K. Aulenbacher
IKP, Mainz, Germany

The laser assisted H⁻ charge exchange concept is under development at the Spallation Neutron Source (SNS) as on option for replacing traditional carbon-based foil technology in future accelerators. A laser based stripping system has the potential to alleviate limiting issues with foil technology, paving the way for accumulation of much higher density proton beams. This paper discusses the advantages and limitations of a laser-based stripping system compared with traditional foil-based charge exchange systems for various beam accumulation scenarios, scaling from SNS experience with high power beam injection and calculations of laser stripping parameters. In addition, preparations for an experimental demonstration of laser assisted stripping for microsecond long 1 GeV, H⁻ beams are described.

Slides THWCR02 [34.408 MB]

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

THYAUD02

Front End and HFOFO Snake for a Muon Facility

solenoid, target, factory, collider

150

D.V. Neuffer, Y.I. Alexahin
Fermilab, Batavia, Illinois, USA

Funding: Work supported by Contract No. De-AC02-07CH11359 with the U. S. Department of Energy
A neutrino factory or muon collider requires the capture and cooling of a large number of muons. Scenarios for capture, bunching, phase-energy rotation and initial cooling of muonss produced from a proton source target have been developed for neutrino factory and Muon Collider designs. The baseline scenarios requires a drift section from the target, a bunching section and a phase-energy rotation section leading into the cooling channel. The currently preferred cooling channel design is an 'HFOFO Snake' configuration that cools both μ+ and μ- transversely and longitudinally. The status of the design is presented and variations are discussed.

Slides THYAUD02 [4.191 MB]

Export •

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