COOL2015 - List of Keywords (emittance)

Paper	Title	Other Keywords	Page
MOWAUD03	Overview of Muon Cooling	collider, factory, lattice, solenoid	1
	D.M. Kaplan Illinois Institute of Technology, Chicago, Illinois, USA
	Funding: DOE Muon cooling techniques are surveyed, along with a concise overview of relevant recent R&D.
	Slides MOWAUD03 [10.200 MB]
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MOPF02	The Green Energy Turbine as Turbo Generator for Powering the HV-Solenoids at a Relativistic Electron Cooler	electron, solenoid, high-voltage, experiment	29
	A. Hofmann, K. Aulenbacher, M.W. Bruker, J. Dietrich, T. Weilbach HIM, Mainz, Germany V.V. Parkhomchuk, V.B. Reva BINP SB RAS, Novosibirsk, Russia
	One challenge in the development of a relativistic electron cooler is the powering of components, e.g. HV-solenoids, which sit on different potentials within a high voltage vessel and need a floating power supply. Within a design study, BINP SB RAS Novosibirsk has proposed two possibilities to build a power supply in a modular way. The first proposal is to use two cascade transformers per module. One cascade transformer powers 22 small HV-solenoids; the second one should generate the acceleration/deceleration voltage. The cascade transformers are fed by a turbo generator, which is powered by a gas under high pressure which is generated outside of the vessel. The second possibility is to use two big HV-solenoids per module. In this proposal, the HV-solenoids are powered directly by a turbo generator. For both concepts, a suitable turbo generator is essential. A potential candidate for the turbo generator could be the Green Energy Turbine (GET) from the company DEPRAG, which works with dry air and delivers a power of 5 kW. At the Helmholtz-Institut Mainz two GETS are tested. After an introduction, we present our experience with the GET and give an overview of the further road map.
	Poster MOPF02 [3.424 MB]
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MOPF07	Final Muon Ionization Cooling Channel using Quadrupole Doublets for Strong Focusing	quadrupole, collider, sextupole, simulation	43
	J.G. Acosta, L.M. Cremaldi, T.L. Hart, S.J. Oliveros, D.J. Summers UMiss, University, Mississippi, USA D.V. Neuffer Fermilab, Batavia, Illinois, USA
	Considerable progress has been made in the design of muon ionization cooling for a collider. A 6D normalized emittance of 0.123 cubic mm has been achieved in simulation, almost a factor of a million in cooling. However, the 6D emittance required by a high luminosity muon collider is 0.044 cubic mm. We explore a final cooling channel composed of quadrupole doublets limited to 14 Tesla. Flat beams formed by a skew quadrupole triplet are used. The low beta regions, as low as 5 mm, produced by the strong focusing quadrupoles are occupied by dense, low Z absorbers that cool the beam. Work is in progress to keep muons with different path lengths in phase with the RF located between cells and to modestly enlarge quadrupole admittance. Calculations and individual cell simulations indicate that the final cooling needed may be possible. Full simulations are in progress. After cooling, emittance exchange in vacuum reduces the transverse emittance to 25 microns and lets the longitudinal emittance grow to 70 mm as needed by a collider. Septa slices a bunch into 17 parts. RF deflector cavities, as used in CLIC tests, form a 3.7 meter long bunch train. Snap bunch coalescence combines the 17 bunches into one in a 21 GeV ring in 55 microseconds.
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MOPF12	N-body Code to Demonstrate Electron Cooling	electron, proton, ion, booster	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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TUWAUD01	Status, Recent Results and Prospect of the International Muon Ionization Cooling Experiment (MICE)	detector, alignment, solenoid, electron	67
	C.T. Rogers STFC/RAL/ASTeC, Chilton, Didcot, Oxon, United Kingdom
	Muon accelerators have been proposed as a means to produce intense, high energy muon beams for particle physics. Designs call for beam cooling to provide suitable beams. Existing cooling schemes cannot operate on time scales that are competitive with the muon lifetime. Ionisation cooling has been proposed as a means to achieve sufficient cooling, but it has never been demonstrated practically. In the Muon Ionisation Cooling Experiment (MICE), based at the Rutherford Appleton Laboratory, ionisation cooling will be demonstrated. MICE Step IV is currently in progress and will be completed in 2016. Muons are brought onto an absorber, resulting in a reduction of momentum and hence reduction of normalised transverse emittance. The full Demonstration of Ionisation Cooling will take place in 2017. An extra magnet module and RF cavities will be installed, as in a cell of a cooling channel. This will enable demonstration of reduction of emittance and subsequent re-acceleration, both critical components for a realistic ionisation cooling channel.
	Slides TUWAUD01 [3.280 MB]
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TUWAUD03	Study of Helical Cooling Channel for Intense Muon Source	plasma, cavity, simulation, solenoid	72
	K. Yonehara Fermilab, Batavia, Illinois, USA Y.S. Derbenev JLab, Newport News, Virginia, USA R.P. Johnson Muons, Inc, Illinois, USA
	Linear beam dynamics of muons in a helical cooling channel is non-trivial. Betatron oscillation in the channel is induced by coupling of motions in xyz-planes. As a result, the analytic eigen values are very complicated. The cooling decrements are controlled by tuning coupling strength. The helical dynamic parameters are translated into the conventional accelerator physics term. Non-linear dynamics in the helical channel is studied by using the conventional accelerator technique. The beam-plasma interaction in a high-pressure hydrogen gas-filled RF cavity is a new physics process and important to design the cooling channel. Machine development of helical beam elements is also shown in this presentation.
	Slides TUWAUD03 [6.220 MB]
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TUWAUD04	Progress on Parametric-resonance Ionization Cooling	resonance, betatron, simulation, optics	77
	V.S. Morozov, Y.S. Derbenev, A.V. Sy JLab, Newport News, Virginia, USA A. Afanasev GWU, Washington, USA R.P. Johnson Muons, Inc, Illinois, USA J.A. Maloney Northern Illinois University, DeKalb, Illinois, USA
	Funding: Work supported in part by U.S. DOE STTR Grants DE-SC0005589 and DE-SC0007634. Authored by Jefferson Science Associates, LLC under U.S. DOE Contract No. DE-AC05-06OR23177. Proposed next-generation muon collider will require major technical advances to achieve the rapid muon beam cooling requirements. Parametric-resonance Ionization Cooling (PIC) is proposed as the final 6D cooling stage of a high-luminosity muon collider. In PIC, a half-integer parametric resonance causes strong focusing of a muon beam at appropriately placed energy absorbers while ionization cooling limits the beam's angular spread. Combining muon ionization cooling with parametric resonant dynamics in this way should then allow much smaller final transverse muon beam sizes than conventional ionization cooling alone. One of the PIC challenges is compensation of beam aberrations over a sufficiently wide parameter range while maintaining the dynamical stability with correlated behavior of the horizontal and vertical betatron motion and dispersion. We explore use of a coupling resonance to reduce the dimensionality of the problem and to shift the dynamics away from non-linear resonances. PIC simulations are presented.
	Slides TUWAUD04 [2.043 MB]
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TUYAUD04	Development of an Ultra Fast RF Kicker for an ERL-based Electron Cooler	electron, kicker, flattop, simulation	89
	A.V. Sy, A.J. Kimber, J. Musson JLab, Newport News, Virginia, USA
	The staged approach to electron cooling proposed for Jefferson Lab's Medium Energy Electron-Ion Collider (MEIC) utilizes bunched beam electron cooling with a single-pass energy recovery linac (ERL) for cooling in the ion collider ring. Possible luminosity upgrades make use of an ERL and full circulator ring and will require ultra-fast kickers that are beyond current technology. A novel approach to generating the necessary ultra fast (ns-level) RF kicking pulse involves the summation of specific subharmonics of the cooling electron bunch frequency; the resultant kicking pulse is then naturally constrained to have rise and fall times equal to the electron bunch frequency. The uniformity of such a pulse and its effects on the beam dynamics of the cooling electron bunch are discussed.
	Slides TUYAUD04 [2.086 MB]
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TUPF02	Development of the Electron Cooling Simulation Program for MEIC	ion, electron, collider, simulation	101
	H. Zhang, J. Chen, R. Li JLab, Newport News, Virginia, USA H. Huang, L. Luo ODU, Norfolk, Virginia, USA
	Funding: Work supported by the Department of Energy, Laboratory Directed Research and Development Funding, under Contract No. DE-AC05-06OR23177 In the medium energy electron ion collider (MEIC) project at Jefferson Lab, the traditional electron cooling technique is used to reduce the ion beam emittance at the booster ring, and to compensate the intrabeam scattering effect and maintain the ion beam emittance during collision at the collider ring. A DC cooler at the booster ring and a bunched beam cooler at the collider ring are proposed. To fulfil the requirements of the cooler design for MEIC, we are developing a new program, which allows us to simulate the following cooling scenarios: DC cooling to coasting ion beam, DC cooling to bunched ion beam, bunched cooling to bunched ion beam, and bunched cooling to coasting ion beam. The new program has been benchmarked with existing code in aspect of accuracy and efficiency. The new program will be adaptive to the modern multicore hardware. We will present our models and some simulation results.
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TUPF04	The MICE Demonstration of Ionization Cooling	lattice, solenoid, collider, factory	104
	T.A. Mohayai IIT, Chicago, Illinois, USA
	Muon beams of low emittance can provide the intense, well known beams for physics of flavour at the Neutrino Factory and multiTev collisions at the Muon Collider. The international Muon Ionization Cooling Experiment (MICE) will demonstrate the technique proposed to reduce the phasespace volume of the muons. In an ionization cooling channel, the combination of energy loss by muons traversing an absorbing material with reacceleration by RF cavities reduces the transverse emittance of the beam (transverse cooling). The rebaselined MICE project will deliver a demonstration of ionization cooling by Sep 2017: a central Li-H absorber, two superconducting focus-coil modules and two 201 MHz singlecavity RF modules. The phase space of the muons entering and leaving the cooling cell will be measured by two solenoidal spectrometers. All the magnets for the ionization-cooling demonstration are available at RAL and the first singlecavity prototype was tested successfully in the MTA Area at Fermilab. The design of the cooling demonstration experiment, a summary of the performance of each of its components and the cooling performance of the configuration will be presented.
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WEWAUD03	Optical Stochastic Cooling at IOTA ring	optics, pick-up, kicker, betatron	123
	V.A. Lebedev, A.L. Romanov Fermilab, Batavia, Illinois, USA
	The optical stochastic cooling (OSC) represents a promising novel technology capable to achieve fast cooling rates required to support high luminosity of future hadron colliders. The OSC is based on the same principles as the normal microwave stochastic cooling but uses much smaller wave length resulting in a possibility of cooling of very dense bunches. In this paper we consider basic principles of the OSC operation and main limitations on its practical implementation. Conclusions will be illustrated by Fermilab proposal of the OSC test in the IOTA ring. Work supported by Fermi Research Alliance, LLC under Contract No. De-AC02-07CH11359 with the United States Department of Energy.
	Slides WEWAUD03 [1.018 MB]
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WEXAUD02	Emittance Growth From Modulated Focusing and Bunched Beam Electron Cooling	electron, ion, resonance, synchrotron	132
	M. Blaskiewicz, J. Kewisch, C. Montag BNL, Upton, Long Island, New York, USA
	The Low Energy electron Cooling (LEReC) project at Brookhaven employs an energy recovery linac to supply electrons in the 1.6 to 5 MeV range. Along with cooling the stored ion beam these bunches create a coherent space charge field which can cause emittance growth. This process is investigated both analytically and via simulation.
	Slides WEXAUD02 [1.267 MB]
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THWCR02	The SNS Laser Stripping Injection Experiment and its Implications on Beam Accumulation	laser, injection, experiment, proton	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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FRWAUD02	Fokker-Planck Approach to the Description of Transverse Stochastic Cooling	kicker, pick-up, betatron, network	170
	F. Nolden GSI, Darmstadt, Germany
	A Fokker-Planck model of transverse stochastic cooling (without feedback through the beam) is presented, which relies on moderately simplified assumptions about the underlying cooling system. The equilibrium emittance distribution turns out to be always exponential. Furthermore, if the initial distribution is already exponential, then the solution of the fully time-dependent Fokker-Planck equation remains exponential. The average emittance decays with a rate towards equilibrium, which is completely consistent with the classical van der Meer rate, including undesired mixing, desired mixing and thermal noise.
	Slides FRWAUD02 [1.088 MB]
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Paper

Title

Other Keywords

Page

MOWAUD03

Overview of Muon Cooling

collider, factory, lattice, solenoid

1

D.M. Kaplan
Illinois Institute of Technology, Chicago, Illinois, USA

Funding: DOE
Muon cooling techniques are surveyed, along with a concise overview of relevant recent R&D.

Slides MOWAUD03 [10.200 MB]

Export •

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

MOPF02

The Green Energy Turbine as Turbo Generator for Powering the HV-Solenoids at a Relativistic Electron Cooler

electron, solenoid, high-voltage, experiment

29

A. Hofmann, K. Aulenbacher, M.W. Bruker, J. Dietrich, T. Weilbach
HIM, Mainz, Germany
V.V. Parkhomchuk, V.B. Reva
BINP SB RAS, Novosibirsk, Russia

One challenge in the development of a relativistic electron cooler is the powering of components, e.g. HV-solenoids, which sit on different potentials within a high voltage vessel and need a floating power supply. Within a design study, BINP SB RAS Novosibirsk has proposed two possibilities to build a power supply in a modular way. The first proposal is to use two cascade transformers per module. One cascade transformer powers 22 small HV-solenoids; the second one should generate the acceleration/deceleration voltage. The cascade transformers are fed by a turbo generator, which is powered by a gas under high pressure which is generated outside of the vessel. The second possibility is to use two big HV-solenoids per module. In this proposal, the HV-solenoids are powered directly by a turbo generator. For both concepts, a suitable turbo generator is essential. A potential candidate for the turbo generator could be the Green Energy Turbine (GET) from the company DEPRAG, which works with dry air and delivers a power of 5 kW. At the Helmholtz-Institut Mainz two GETS are tested. After an introduction, we present our experience with the GET and give an overview of the further road map.

Poster MOPF02 [3.424 MB]

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MOPF07

Final Muon Ionization Cooling Channel using Quadrupole Doublets for Strong Focusing

quadrupole, collider, sextupole, simulation

43

J.G. Acosta, L.M. Cremaldi, T.L. Hart, S.J. Oliveros, D.J. Summers
UMiss, University, Mississippi, USA
D.V. Neuffer
Fermilab, Batavia, Illinois, USA

Considerable progress has been made in the design of muon ionization cooling for a collider. A 6D normalized emittance of 0.123 cubic mm has been achieved in simulation, almost a factor of a million in cooling. However, the 6D emittance required by a high luminosity muon collider is 0.044 cubic mm. We explore a final cooling channel composed of quadrupole doublets limited to 14 Tesla. Flat beams formed by a skew quadrupole triplet are used. The low beta regions, as low as 5 mm, produced by the strong focusing quadrupoles are occupied by dense, low Z absorbers that cool the beam. Work is in progress to keep muons with different path lengths in phase with the RF located between cells and to modestly enlarge quadrupole admittance. Calculations and individual cell simulations indicate that the final cooling needed may be possible. Full simulations are in progress. After cooling, emittance exchange in vacuum reduces the transverse emittance to 25 microns and lets the longitudinal emittance grow to 70 mm as needed by a collider. Septa slices a bunch into 17 parts. RF deflector cavities, as used in CLIC tests, form a 3.7 meter long bunch train. Snap bunch coalescence combines the 17 bunches into one in a 21 GeV ring in 55 microseconds.

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MOPF12

N-body Code to Demonstrate Electron Cooling

electron, proton, ion, booster

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)

TUWAUD01

Status, Recent Results and Prospect of the International Muon Ionization Cooling Experiment (MICE)

detector, alignment, solenoid, electron

67

C.T. Rogers
STFC/RAL/ASTeC, Chilton, Didcot, Oxon, United Kingdom

Muon accelerators have been proposed as a means to produce intense, high energy muon beams for particle physics. Designs call for beam cooling to provide suitable beams. Existing cooling schemes cannot operate on time scales that are competitive with the muon lifetime. Ionisation cooling has been proposed as a means to achieve sufficient cooling, but it has never been demonstrated practically. In the Muon Ionisation Cooling Experiment (MICE), based at the Rutherford Appleton Laboratory, ionisation cooling will be demonstrated. MICE Step IV is currently in progress and will be completed in 2016. Muons are brought onto an absorber, resulting in a reduction of momentum and hence reduction of normalised transverse emittance. The full Demonstration of Ionisation Cooling will take place in 2017. An extra magnet module and RF cavities will be installed, as in a cell of a cooling channel. This will enable demonstration of reduction of emittance and subsequent re-acceleration, both critical components for a realistic ionisation cooling channel.

Slides TUWAUD01 [3.280 MB]

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TUWAUD03

Study of Helical Cooling Channel for Intense Muon Source

plasma, cavity, simulation, solenoid

72

K. Yonehara
Fermilab, Batavia, Illinois, USA
Y.S. Derbenev
JLab, Newport News, Virginia, USA
R.P. Johnson
Muons, Inc, Illinois, USA

Linear beam dynamics of muons in a helical cooling channel is non-trivial. Betatron oscillation in the channel is induced by coupling of motions in xyz-planes. As a result, the analytic eigen values are very complicated. The cooling decrements are controlled by tuning coupling strength. The helical dynamic parameters are translated into the conventional accelerator physics term. Non-linear dynamics in the helical channel is studied by using the conventional accelerator technique. The beam-plasma interaction in a high-pressure hydrogen gas-filled RF cavity is a new physics process and important to design the cooling channel. Machine development of helical beam elements is also shown in this presentation.

Slides TUWAUD03 [6.220 MB]

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TUWAUD04

Progress on Parametric-resonance Ionization Cooling

resonance, betatron, simulation, optics

77

V.S. Morozov, Y.S. Derbenev, A.V. Sy
JLab, Newport News, Virginia, USA
A. Afanasev
GWU, Washington, USA
R.P. Johnson
Muons, Inc, Illinois, USA
J.A. Maloney
Northern Illinois University, DeKalb, Illinois, USA

Funding: Work supported in part by U.S. DOE STTR Grants DE-SC0005589 and DE-SC0007634. Authored by Jefferson Science Associates, LLC under U.S. DOE Contract No. DE-AC05-06OR23177.
Proposed next-generation muon collider will require major technical advances to achieve the rapid muon beam cooling requirements. Parametric-resonance Ionization Cooling (PIC) is proposed as the final 6D cooling stage of a high-luminosity muon collider. In PIC, a half-integer parametric resonance causes strong focusing of a muon beam at appropriately placed energy absorbers while ionization cooling limits the beam's angular spread. Combining muon ionization cooling with parametric resonant dynamics in this way should then allow much smaller final transverse muon beam sizes than conventional ionization cooling alone. One of the PIC challenges is compensation of beam aberrations over a sufficiently wide parameter range while maintaining the dynamical stability with correlated behavior of the horizontal and vertical betatron motion and dispersion. We explore use of a coupling resonance to reduce the dimensionality of the problem and to shift the dynamics away from non-linear resonances. PIC simulations are presented.

Slides TUWAUD04 [2.043 MB]

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TUYAUD04

Development of an Ultra Fast RF Kicker for an ERL-based Electron Cooler

electron, kicker, flattop, simulation

89

A.V. Sy, A.J. Kimber, J. Musson
JLab, Newport News, Virginia, USA

The staged approach to electron cooling proposed for Jefferson Lab's Medium Energy Electron-Ion Collider (MEIC) utilizes bunched beam electron cooling with a single-pass energy recovery linac (ERL) for cooling in the ion collider ring. Possible luminosity upgrades make use of an ERL and full circulator ring and will require ultra-fast kickers that are beyond current technology. A novel approach to generating the necessary ultra fast (ns-level) RF kicking pulse involves the summation of specific subharmonics of the cooling electron bunch frequency; the resultant kicking pulse is then naturally constrained to have rise and fall times equal to the electron bunch frequency. The uniformity of such a pulse and its effects on the beam dynamics of the cooling electron bunch are discussed.

Slides TUYAUD04 [2.086 MB]

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TUPF02

Development of the Electron Cooling Simulation Program for MEIC

ion, electron, collider, simulation

101

H. Zhang, J. Chen, R. Li
JLab, Newport News, Virginia, USA
H. Huang, L. Luo
ODU, Norfolk, Virginia, USA

Funding: Work supported by the Department of Energy, Laboratory Directed Research and Development Funding, under Contract No. DE-AC05-06OR23177
In the medium energy electron ion collider (MEIC) project at Jefferson Lab, the traditional electron cooling technique is used to reduce the ion beam emittance at the booster ring, and to compensate the intrabeam scattering effect and maintain the ion beam emittance during collision at the collider ring. A DC cooler at the booster ring and a bunched beam cooler at the collider ring are proposed. To fulfil the requirements of the cooler design for MEIC, we are developing a new program, which allows us to simulate the following cooling scenarios: DC cooling to coasting ion beam, DC cooling to bunched ion beam, bunched cooling to bunched ion beam, and bunched cooling to coasting ion beam. The new program has been benchmarked with existing code in aspect of accuracy and efficiency. The new program will be adaptive to the modern multicore hardware. We will present our models and some simulation results.

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TUPF04

The MICE Demonstration of Ionization Cooling

lattice, solenoid, collider, factory

104

T.A. Mohayai
IIT, Chicago, Illinois, USA

Muon beams of low emittance can provide the intense, well known beams for physics of flavour at the Neutrino Factory and multiTev collisions at the Muon Collider. The international Muon Ionization Cooling Experiment (MICE) will demonstrate the technique proposed to reduce the phasespace volume of the muons. In an ionization cooling channel, the combination of energy loss by muons traversing an absorbing material with reacceleration by RF cavities reduces the transverse emittance of the beam (transverse cooling). The rebaselined MICE project will deliver a demonstration of ionization cooling by Sep 2017: a central Li-H absorber, two superconducting focus-coil modules and two 201 MHz singlecavity RF modules. The phase space of the muons entering and leaving the cooling cell will be measured by two solenoidal spectrometers. All the magnets for the ionization-cooling demonstration are available at RAL and the first singlecavity prototype was tested successfully in the MTA Area at Fermilab. The design of the cooling demonstration experiment, a summary of the performance of each of its components and the cooling performance of the configuration will be presented.

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WEWAUD03

Optical Stochastic Cooling at IOTA ring

optics, pick-up, kicker, betatron

123

V.A. Lebedev, A.L. Romanov
Fermilab, Batavia, Illinois, USA

The optical stochastic cooling (OSC) represents a promising novel technology capable to achieve fast cooling rates required to support high luminosity of future hadron colliders. The OSC is based on the same principles as the normal microwave stochastic cooling but uses much smaller wave length resulting in a possibility of cooling of very dense bunches. In this paper we consider basic principles of the OSC operation and main limitations on its practical implementation. Conclusions will be illustrated by Fermilab proposal of the OSC test in the IOTA ring.
Work supported by Fermi Research Alliance, LLC under Contract No. De-AC02-07CH11359 with the United States Department of Energy.

Slides WEWAUD03 [1.018 MB]

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WEXAUD02

Emittance Growth From Modulated Focusing and Bunched Beam Electron Cooling

electron, ion, resonance, synchrotron

132

M. Blaskiewicz, J. Kewisch, C. Montag
BNL, Upton, Long Island, New York, USA

The Low Energy electron Cooling (LEReC) project at Brookhaven employs an energy recovery linac to supply electrons in the 1.6 to 5 MeV range. Along with cooling the stored ion beam these bunches create a coherent space charge field which can cause emittance growth. This process is investigated both analytically and via simulation.

Slides WEXAUD02 [1.267 MB]

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THWCR02

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

laser, injection, experiment, proton

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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FRWAUD02

Fokker-Planck Approach to the Description of Transverse Stochastic Cooling

kicker, pick-up, betatron, network

170

F. Nolden
GSI, Darmstadt, Germany

A Fokker-Planck model of transverse stochastic cooling (without feedback through the beam) is presented, which relies on moderately simplified assumptions about the underlying cooling system. The equilibrium emittance distribution turns out to be always exponential. Furthermore, if the initial distribution is already exponential, then the solution of the fully time-dependent Fokker-Planck equation remains exponential. The average emittance decays with a rate towards equilibrium, which is completely consistent with the classical van der Meer rate, including undesired mixing, desired mixing and thermal noise.

Slides FRWAUD02 [1.088 MB]

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