COOL2017 - List of Keywords (simulation)

Paper	Title	Other Keywords	Page
MOA13	Measurement of Phase Space Density Evolution in MICE	ion, emittance, collider, solenoid	6
	F. Drielsma DPNC, Genève, Switzerland D. M. Maletic Belgrade Institute of Physics, Belgrade, Serbia
	Funding: STFC, DOE, NSF, INFN, CHIPP etc The Muon Ionization Cooling Experiment (MICE) collaboration will demonstrate the feasibility of ionization cooling, the technique proposed for a future muon storage ring or collider. The muon beam parameters are measured particle-by-particle, before and after a cooling cell, using high precision scintillating-fibre trackers in a solenoidal field. The position and momentum reconstruction of individual muons in MICE allows for the development of several alternative figures of merit in addition to beam emittance. Contraction of the phase-space volume occupied by the sample, or equivalently the increase in phase-space density at its core, is an unequivocal cooling signature. Single-particle amplitude, defined as a weighted distance to the sample centroid, can be used to probe the change in the density in the core of the beam. Alternatively, non-parametric statistics provides reliable methods to estimate the entire phase-space density distribution and reconstruct probability contours. The aforementioned techniques are robust to transmission losses and sample non-linearities, making them ideal candidates to perform a cooling measurement in MICE. Preliminary results are presented here. Submitted by the MICE speakers bureau. If accepted, a member of the collaboration will be selected to present the contribution
	Slides MOA13 [1.926 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-COOL2017-MOA13
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOA22	Recent Results from MICE on Multiple Coulomb Scattering and Energy Loss	ion, scattering, experiment, emittance	16
	J.C. Nugent, P. Soler University of Glasgow, Glasgow, United Kingdom R. Bayes Laurentian University, Campus Sudbury, Sudbury, Ontario, Canada
	Funding: STFC, DOE, NSF, INFN, CHIPP etc Multiple coulomb scattering and energy loss are well known phenomena experienced by charged particles as they traverse a material. However, from recent measurements by the MuScat collaboration, it is known that the available simulation codes (GEANT4, for example) overestimate the scattering of muons in low Z materials. This is of particular interest to the Muon Ionization Cooling Experiment (MICE) collaboration which has the goal of measuring the reduction of the emittance of a muon beam induced by energy loss in low Z absorbers. MICE took data without magnetic field suitable for multiple scattering measurements in the fall of 2015 with the absorber vessel filled with Xenon and in the spring of 2016 using a lithium hydride absorber. The scattering data are compared with the predictions of various models, including the default GEANT4 model. In the fall of 2016 MICE took data with magnetic fields on and measured the energy loss of muons in a lithium hydride absorber. These data are also compared with model predictions and with the Bethe-Bloch formula. Submitted by the MICE speakers bureau. If accepted, a member of the collaboration will be selected to present the contribution
	Slides MOA22 [4.626 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-COOL2017-MOA22
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUP04	Muon Intensity Increase by Wedge Absorbers for low-E Muon Experiments	ion, solenoid, emittance, experiment	32
	D.V. Neuffer, J. Bradley, D. Stratakis Fermilab, Batavia, Illinois, USA
	Low energy muon experiments such as mu2e and g-2 have a limited energy spread acceptance. Following techniques developed in muon cooling studies and the MICE experiment, the number of muons within the desired energy spread can be increased by the matched use of wedge absorbers. More generally, the phase space of muon beams can be manipulated by absorbers in beam transport lines. Applications with simulation results are presented.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-COOL2017-TUP04
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUP06	Stochastic Cooling as Wiener Process	ion, coherent-effects, incoherent-effects, electron	37
	N. Shurkhno FZJ, Jülich, Germany
	Traditional theoretical description of stochastic cooling process involves either ordinary differential equations for desired rms quantities or corresponding Fokker-Planck equations. Both approaches use different methods of derivation and seem independent, making transition from one to another quite an issue, incidentally entangling somewhat the basic physics underneath. On the other hand, treatment of the stochastic cooling as Wiener pro-cess and starting from the single-particle dynamics written in the form of Langevin equation seems to bring more clarity and integrity. Present work is an attempt to apply Wiener process formalism to the stochastic cooling in order to have a simple and consistent way of deriving its well-known equations.
	Poster TUP06 [0.414 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-COOL2017-TUP06
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUP12	Simulation of Low Enery Ion Beam Cooling With Pulsed Electron Beam on CSRm	ion, electron, beam-cooling, synchrotron	50
	H. Zhao, J. Li, L.J. Mao, M.T. Tang, J.C. Yang, X.D. Yang IMP/CAS, Lanzhou, People's Republic of China
	The pulsed electron beam can be applied to high ener-gy beam cooling and the researches of ion-electron inter-action in the future. In this paper, we studied the pulsed e-beam cooling effects on coasting and bunched ion beam by simulation code which is based on the theory of elec-tron cooling, IBS and space charge effect etc. In the simu-lation, a rectangular distribution of electron beam was applied to 7 MeV/u 12C⁶⁺ ion beam on CSRm. It is found that the coasting ion beam was bunched by the pulsed e-beam and the rising and falling region of electron beam current play an important role for the bunching effect, and similar phenomenon was found for the bunched ion beam. In addition, the analyses of these phenomena in simulation were discussed.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-COOL2017-TUP12
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEM12	Development of a Bunched Beam Electron Cooler Based on ERL and Circulator Ring Technology for the Jefferson Lab Electron-Ion Collider	ion, electron, solenoid, proton	72
	S.V. Benson, Y.S. Derbenev, D. Douglas, F.E. Hannon, A. Hutton, R. Li, R.A. Rimmer, Y. Roblin, C. Tennant, H. Wang, H. Zhang, Y. Zhang JLab, Newport News, Virginia, USA
	Funding: Authored by Jefferson Science Associates, LLC under U.S. DOE Contract No. DE-AC05-06OR23177. Jefferson Lab is in the process of designing an electron ion collider with unprecedented luminosity at a 45 GeV center-of-mass energy. This luminosity relies on ion cooling in both the booster and the storage ring of the accelerator complex. The cooling in the booster will use a conventional DC cooler similar to the one at COSY. The high-energy storage ring, operating at a momentum of up to 100 GeV/nucleon, requires the novel use of bunched-beam cooling. There are two designs for such a bunched beam cooler. The first uses a conventional Energy Recovery Linac (ERL) with a magnetized beam while the second uses a circulating ring to enhance both the peak and average current experienced by the ion beam. This presentation will describe the design of both the Circulator Cooling Ring (CCR) design and that of the backup option using the stand-alone ERL operated at lower charge but higher repetition rate than the ERL injector required by the CCR-based design.
	Slides WEM12 [5.124 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-COOL2017-WEM12
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THA11	The HESR Stochastic Cooling System, Design, Construction and Test Experiments in COSY	ion, kicker, pick-up, experiment	89
	R. Stassen, B. Breitkreutz, N. Shurkhno, H. Stockhorst FZJ, Jülich, Germany L. Thorndahl CERN, Geneva, Switzerland
	The construction phase of the stochastic cooling tanks for the HESR has started. Meanwhile two pickups (PU) and one kicker (KI) are fabricated. One PU and one KI are installed into the COSY ring for testing the new stochastic cooling system with real beam at various momenta. Small test-structures were already successfully operated at the Nuclotron in Dubna for longitudinal filter cooling but not for transverse cooling and as small PU in COSY. During the last COSY beam-time in 2017 additional transverse and ToF cooling were achieved. The first two series high power amplifiers were used for cooling and to test the temperature behavior of the combiner-boards at the KI. The system layout includes all components as planned for the HESR like low noise amplifier, switchable delay-lines and optical notch-filter. The HESR needs fast transmission-lines between PU and KI. Beside air-filled coax-lines, optical hollow fiber-lines are very attractive. First results with such a fiber used for the transverse signal path will be presented.
	Slides THA11 [11.863 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-COOL2017-THA11
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Other Keywords

Page

MOA13

Measurement of Phase Space Density Evolution in MICE

ion, emittance, collider, solenoid

6

F. Drielsma
DPNC, Genève, Switzerland
D. M. Maletic
Belgrade Institute of Physics, Belgrade, Serbia

Funding: STFC, DOE, NSF, INFN, CHIPP etc
The Muon Ionization Cooling Experiment (MICE) collaboration will demonstrate the feasibility of ionization cooling, the technique proposed for a future muon storage ring or collider. The muon beam parameters are measured particle-by-particle, before and after a cooling cell, using high precision scintillating-fibre trackers in a solenoidal field. The position and momentum reconstruction of individual muons in MICE allows for the development of several alternative figures of merit in addition to beam emittance. Contraction of the phase-space volume occupied by the sample, or equivalently the increase in phase-space density at its core, is an unequivocal cooling signature. Single-particle amplitude, defined as a weighted distance to the sample centroid, can be used to probe the change in the density in the core of the beam. Alternatively, non-parametric statistics provides reliable methods to estimate the entire phase-space density distribution and reconstruct probability contours. The aforementioned techniques are robust to transmission losses and sample non-linearities, making them ideal candidates to perform a cooling measurement in MICE. Preliminary results are presented here.
Submitted by the MICE speakers bureau. If accepted, a member of the collaboration will be selected to present the contribution

Slides MOA13 [1.926 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-COOL2017-MOA13

Export •

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

MOA22

Recent Results from MICE on Multiple Coulomb Scattering and Energy Loss

ion, scattering, experiment, emittance

16

J.C. Nugent, P. Soler
University of Glasgow, Glasgow, United Kingdom
R. Bayes
Laurentian University, Campus Sudbury, Sudbury, Ontario, Canada

Funding: STFC, DOE, NSF, INFN, CHIPP etc
Multiple coulomb scattering and energy loss are well known phenomena experienced by charged particles as they traverse a material. However, from recent measurements by the MuScat collaboration, it is known that the available simulation codes (GEANT4, for example) overestimate the scattering of muons in low Z materials. This is of particular interest to the Muon Ionization Cooling Experiment (MICE) collaboration which has the goal of measuring the reduction of the emittance of a muon beam induced by energy loss in low Z absorbers. MICE took data without magnetic field suitable for multiple scattering measurements in the fall of 2015 with the absorber vessel filled with Xenon and in the spring of 2016 using a lithium hydride absorber. The scattering data are compared with the predictions of various models, including the default GEANT4 model. In the fall of 2016 MICE took data with magnetic fields on and measured the energy loss of muons in a lithium hydride absorber. These data are also compared with model predictions and with the Bethe-Bloch formula.
Submitted by the MICE speakers bureau. If accepted, a member of the collaboration will be selected to present the contribution

Slides MOA22 [4.626 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-COOL2017-MOA22

Export •

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

TUP04

Muon Intensity Increase by Wedge Absorbers for low-E Muon Experiments

ion, solenoid, emittance, experiment

32

D.V. Neuffer, J. Bradley, D. Stratakis
Fermilab, Batavia, Illinois, USA

Low energy muon experiments such as mu2e and g-2 have a limited energy spread acceptance. Following techniques developed in muon cooling studies and the MICE experiment, the number of muons within the desired energy spread can be increased by the matched use of wedge absorbers. More generally, the phase space of muon beams can be manipulated by absorbers in beam transport lines. Applications with simulation results are presented.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-COOL2017-TUP04

Export •

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

TUP06

Stochastic Cooling as Wiener Process

ion, coherent-effects, incoherent-effects, electron

37

N. Shurkhno
FZJ, Jülich, Germany

Traditional theoretical description of stochastic cooling process involves either ordinary differential equations for desired rms quantities or corresponding Fokker-Planck equations. Both approaches use different methods of derivation and seem independent, making transition from one to another quite an issue, incidentally entangling somewhat the basic physics underneath. On the other hand, treatment of the stochastic cooling as Wiener pro-cess and starting from the single-particle dynamics written in the form of Langevin equation seems to bring more clarity and integrity. Present work is an attempt to apply Wiener process formalism to the stochastic cooling in order to have a simple and consistent way of deriving its well-known equations.

Poster TUP06 [0.414 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-COOL2017-TUP06

Export •

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

TUP12

Simulation of Low Enery Ion Beam Cooling With Pulsed Electron Beam on CSRm

ion, electron, beam-cooling, synchrotron

50

H. Zhao, J. Li, L.J. Mao, M.T. Tang, J.C. Yang, X.D. Yang
IMP/CAS, Lanzhou, People's Republic of China

The pulsed electron beam can be applied to high ener-gy beam cooling and the researches of ion-electron inter-action in the future. In this paper, we studied the pulsed e-beam cooling effects on coasting and bunched ion beam by simulation code which is based on the theory of elec-tron cooling, IBS and space charge effect etc. In the simu-lation, a rectangular distribution of electron beam was applied to 7 MeV/u 12C⁶⁺ ion beam on CSRm. It is found that the coasting ion beam was bunched by the pulsed e-beam and the rising and falling region of electron beam current play an important role for the bunching effect, and similar phenomenon was found for the bunched ion beam. In addition, the analyses of these phenomena in simulation were discussed.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-COOL2017-TUP12

Export •

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

WEM12

Development of a Bunched Beam Electron Cooler Based on ERL and Circulator Ring Technology for the Jefferson Lab Electron-Ion Collider

ion, electron, solenoid, proton

72

S.V. Benson, Y.S. Derbenev, D. Douglas, F.E. Hannon, A. Hutton, R. Li, R.A. Rimmer, Y. Roblin, C. Tennant, H. Wang, H. Zhang, Y. Zhang
JLab, Newport News, Virginia, USA

Funding: Authored by Jefferson Science Associates, LLC under U.S. DOE Contract No. DE-AC05-06OR23177.
Jefferson Lab is in the process of designing an electron ion collider with unprecedented luminosity at a 45 GeV center-of-mass energy. This luminosity relies on ion cooling in both the booster and the storage ring of the accelerator complex. The cooling in the booster will use a conventional DC cooler similar to the one at COSY. The high-energy storage ring, operating at a momentum of up to 100 GeV/nucleon, requires the novel use of bunched-beam cooling. There are two designs for such a bunched beam cooler. The first uses a conventional Energy Recovery Linac (ERL) with a magnetized beam while the second uses a circulating ring to enhance both the peak and average current experienced by the ion beam. This presentation will describe the design of both the Circulator Cooling Ring (CCR) design and that of the backup option using the stand-alone ERL operated at lower charge but higher repetition rate than the ERL injector required by the CCR-based design.

Slides WEM12 [5.124 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-COOL2017-WEM12

Export •

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

THA11

The HESR Stochastic Cooling System, Design, Construction and Test Experiments in COSY

ion, kicker, pick-up, experiment

89

R. Stassen, B. Breitkreutz, N. Shurkhno, H. Stockhorst
FZJ, Jülich, Germany
L. Thorndahl
CERN, Geneva, Switzerland

The construction phase of the stochastic cooling tanks for the HESR has started. Meanwhile two pickups (PU) and one kicker (KI) are fabricated. One PU and one KI are installed into the COSY ring for testing the new stochastic cooling system with real beam at various momenta. Small test-structures were already successfully operated at the Nuclotron in Dubna for longitudinal filter cooling but not for transverse cooling and as small PU in COSY. During the last COSY beam-time in 2017 additional transverse and ToF cooling were achieved. The first two series high power amplifiers were used for cooling and to test the temperature behavior of the combiner-boards at the KI. The system layout includes all components as planned for the HESR like low noise amplifier, switchable delay-lines and optical notch-filter. The HESR needs fast transmission-lines between PU and KI. Beside air-filled coax-lines, optical hollow fiber-lines are very attractive. First results with such a fiber used for the transverse signal path will be presented.

Slides THA11 [11.863 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-COOL2017-THA11

Export •

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