COOL2015 - List of Keywords (ion)

Paper	Title	Other Keywords	Page
MOYAUD02	Stochastic Cooling of Heavy Ions in the HESR	heavy-ion, pick-up, impedance, target	15
	R. Stassen, B. Breitkreutz, G. Schug, H. Stockhorst FZJ, Jülich, Germany
	Due to the modularized start version (MSV) of the FAIR project with the postponed NESR, the HESR (High Energy Storage Ring) became very attractive for experiments with heavy ions. Although the HESR is optimized for the storage of antiprotons it is also well suited for heavy-ion beams with slightly changes in the optics. Within the MSV only stochastic cooling and no e-cooling will be available, but even the main 2-4 GHz stochastic cooling system will be capable to fulfill the beam requirements for heavy ions. Most critical parts of the active elements are the high power amplifiers. The stochastic cooling amplifiers for the HESR will be based on new GaN devices. Nonlinearities of these devices necessitate a dedicated analysis for use in stochastic cooling systems.
	Slides MOYAUD02 [5.720 MB]
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MOYAUD03	Stochastic Cooling System for HESR - Theoretical and Simulation Studies	pick-up, kicker, antiproton, target	20
	H. Stockhorst, B. Lorentz, R. Maier, D. Prasuhn, R. Stassen FZJ, Jülich, Germany T. Katayama Nihon University, Narashino, Chiba, Japan
	The High-Energy Storage Ring (HESR) is part of the upcoming International Facility for Antiproton and Ion Research (FAIR) at GSI in Darmstadt. The HESR dedicates to the field of high-energy antiproton physics to explore the research areas of charmonium spectroscopy, hadronic structure, and quark-gluon dynamics with high-quality beams over a broad momentum range from 1.5 to 15 GeV/c. The facility provides the combination of powerful phase-space cooled antiproton beams and internal Pellet or gas jet targets to achieve the requirements of the experiment PANDA in terms of beam quality and luminosity. Recently, the feasibility of the HESR has been investigated for the application of cooled heavy ion beams with the special emphasis on the experimental program of the SPARC collaboration at FAIR. In this contribution an outline of the Fokker-Planck approach and particle tracking for momentum cooling assisted by a barrier bucket cavity with an internal target is given. A comparison of the filter and filter-less TOF cooling techniques including beam feedback is presented. Simulation and experimental studies at COSY to verify the predictions of the cooling theory complete the contribution.
	Slides MOYAUD03 [4.508 MB]
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MOYAUD04	Stochastic Cooling Developments for the Collector Ring at FAIR	pick-up, antiproton, kicker, cryogenics	25
	C. Dimopoulou, D. Barker, R.M. Böhm, R. Hettrich, W. Maier, C. Peschke, A. Stuhl, S. Wunderlich GSI, Darmstadt, Germany L. Thorndahl CERN, Geneva, Switzerland
	A Status report on the ongoing developments for the demanding stochastic cooling system of the Collector Ring is given. The system operates in the frequency band 1-2 GHz, it has to provide fast 3D cooling of antiproton, rare isotope and stable heavy ion beams. The main challenges are (i) the cooling of antiprotons by means of cryogenic movable pick-up electrodes and (ii) the fast two-stage cooling (pre-cooling by the Palmer method, followed by the notch filter method) of the hot rare isotope beams. Progress in designing, testing and integrating the hardware is discussed.
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MOPF05	A Cooling Storage Ring for an Electron-Ion Collider	electron, simulation, collider, booster	36
	J. Gerity, P.M. McIntyre Texas A&M University, College Station, USA
	Electron cooling offers performance advantages to the design of an electron-ion collider. A first design of a 6 GeV/u storage ring for the cooling of ions in MEIC is presented, along with some remarks on the particulars of electron cooling in this ring.
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MOPF06	Quantification of the Electron Plasma in TItan's Cooler Penning Trap	electron, detector, plasma, TRIUMF	39
	B.A. Kootte, B. Barquest, U. Chowdhury, J. Even, M. Good, A.A. Kwiatkowski, D. Lascar, K.G. Leach, A. Lennarz, D.A. Short TRIUMF, Canada's National Laboratory for Particle and Nuclear Physics, Vancouver, Canada M. Alanssari Universität Muenster, Physikalisches Institut, Muenster, Germany C. Andreoiu SFU, Burnaby, BC, Canada J. Bale, J. Dilling, A. Finlay, A.A. Gallant, E. Leistenschneider UBC & TRIUMF, Vancouver, British Columbia, Canada D. Frekers Institut für Kernphysik, Westfälische Wilhelms-Universität Münster, Münster, Germany G. Gwinner University of Manitoba, Manitoba, Canada R. Klawitter Heidelberg University, Physics Institute, Heidelberg, Germany T.T. Li UW/Physics, Waterloo, Ontario, Canada A.J. Mayer University of Calgary, NW Calgary, Alberta, Canada R. Schupp MPI, Muenchen, Germany
	Funding: Funded by Natural Sciences and Engineering Research Council of Canada (NSERC) Modern rare isotope facilities provide beams of shortlived radionuclides primarily for studies in the field of nuclear structure, nuclear astrophysics, and low energy particle physics. At these facilities, many activities such as re-acceleration, improvement of resolving power, and precision experimental measurements require charge breeding of ions. However, the charge breeding process can increase the energy spread of an ion bunch, adversely affecting the experiment. A Cooler Penning Trap (CPET) is being developed to address such an energy spread by means of sympathetic electron cooling of the Highly Charged Ion bunches to . 1 eV/q. Recent work has focused on developing a strategy to effectively detect the trapped electron plasma without obstructing the passage of ions through the beamline. The first offline tests demonstrate the ability to trap and detect more than 10⁸ electrons. This was achieved by using a novel wire mesh detector as a diagnostic tool for the electrons. * E.M. Burbidge et al, Rev Mod Phys, 29 547 (1957) V.V. Simon et al, Phys Rev C, 85 064308 (2012) * Z. Ke et al, Hyp Int, 173 103 (2006) **** U. Chowdhury et al, AIP Conf Proc, 1640 120 (2015)
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MOPF12	N-body Code to Demonstrate Electron Cooling	electron, proton, 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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TUXAUD02	Project of Electron Cooler for NICA	electron, collider, solenoid, luminosity	82
	I.N. Meshkov, E.V. Ahmanova, A.G. Kobets, O. Orlov, V.I. Shokin, A.A. Sidorin, S. Yakovenko JINR, Dubna, Moscow Region, Russia M.N. Kokurkin, N.Yu. Lysov Allrussian Electrotechnical Institute, Moskow, Russia
	The problems of development of high energy electron coolers are discussed on the basis of the existing experience. Necessities of electron cooling application to NICA collider are considered and the project parameters of the electron cooler at NICA collider are presented. Electron cooler of the NICA Collider is under design and development of its elements at JINR. It will provide the formation of an intense ion beam and maintain it in the electron energy range of 0.5'2.5 MeV. To achieve the required energy of the electrons all the elements of the Cooler are placed in the tanks filled with sulfur hexafluoride (SF6) gas under pressure of 6 atm. For testing the Cooler elements the test bench «Recuperator» is used and upgraded. The results of testing of the prototypes of the Cooler elements and the present stage of the technical design of the Cooler are described in this paper.
	Slides TUXAUD02 [5.849 MB]
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TUYAUD03	Formation of Bunched Electron Beam at the Electron Cooler of CSRm	electron, controls, gun, cathode	85
	X.D. Yang, J. Li, X.M. Ma, L.J. Mao, M.T. Tang, T.L. Yan IMP/CAS, Lanzhou, People's Republic of China
	The motivation for formation of bunched electron beam at the electron cooler of CSRm is based on the three requirements. Firstly, the high energy electron cooling, especially, the ion beam with TeV energy, the bunched electron beam for cooling would be easier than the DC operating mode. Secondly, the electric field induced by the intensity modulated electron beam will be used for the suppression of instability developed in the high intensity ion beam after accumulation with the help of electron cooling, Thirdly, the electron beam was required to turn on and off in the different period of the atomic physics experiments. Some initial design and consideration were presented in this paper. And also the current situation and condition of CSRm electron cooler were described here. An off-line testbench will be established in the laboratory, and the test and the optimization will be explored in this experimentation. The validity of this system will be verified in the near future. The procedure of the modulation on the voltage of control electrode in the electron gun of the CSRm cooler was discussed. The scheme of off-line measurement was devised according to the progress.
	Slides TUYAUD03 [4.038 MB]
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TUZAUD03	Simulation Studies on Intensity Limitations of Laser Cooling at High Energy	laser, synchrotron, space-charge, scattering	93
	L. Eidam, O. Boine-Frankenheim, D.F.A. Winters GSI, Darmstadt, Germany
	Within the FAIR project, laser cooling of highly intense, ultra relativistic ion beams will be attempted for the first time, and in a large (circumference 1084 m) and strong (max. magnetic rigidity 100 Tm) synchrotron, called "SIS100". Laser cooling of such ion beams should result in a further increase of the longitudinal phase space density and in non-Gaussian longitudinal beam profiles. For stable operation of such ion beams, and for optimization of the cooling process, both the laser force and the high-intensity effects have to be studied numerically in advance. The efficiency of laser cooling has been analyzed for different synchrotron frequency regimes. At high beam intensities, intra-beam scattering and space-charge effects have been found to counteract the laser cooling force. We will discuss how they influence the laser cooling efficiency and thus affect the cooling time.
	Slides TUZAUD03 [5.044 MB]
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TUPF02	Development of the Electron Cooling Simulation Program for MEIC	electron, emittance, 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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TUPF09	Decoupling and Matching of Electron Cooling Section in the MEIC Ion Collider Ring	electron, solenoid, collider, coupling	116
	G.H. Wei, F. Lin, V.S. Morozov, H. Zhang JLab, Newport News, Virginia, USA
	To get a luminosity level of 10³³ cm^-2 s^-1 at all design points of the MEIC, small transverse emittance is necessary in the ion collider ring, which is achieved by an electron cooling. And for the electron cooling, two solenoids are used to create a cooling environment of temperature exchange between electron beam and ion beam. However, the solenoids can also cause coupling and matching problem for the optics of the MEIC ion ring lattice. Both of them will have influences on the IP section and other areas, especially for the beam size, Twiss parameters, and nonlinear effects. A symmetric and flexible method is used to deal with these problems. With this method, the electron cooling section is merged into the ion ring lattice elegantly.
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TUPF10	Harmonic Stripline Kicker for MEIC Bunched Beam Cooler	kicker, electron, impedance, feedback	120
	J. Guo, H. Wang JLab, Newport News, Virginia, USA
	Funding: Authored by Jefferson Science Associates, LLC under U.S. DOE Contract No. DE-AC05-06OR23177 In the current MEIC design, the ion collider ring needs to be cooled by a bunched electron beam of up to 200 mA 55 MeV, with the possibility to upgrade to 1.5 A. Although it's not impossible to design and build an ERL to provide such a beam, the technical risk and cost associated with such an ERL will be very high. An alternative is to recirculate the electron bunches in a ring for up to 25 turns until the bunch's quality is degraded, reducing the beam current in the ERL by a factor of 25. This scheme requires a pair of fast kickers that kick one in every 25 bunches. In this paper, we will analyze the electrodynamics of a harmonic stripline kicker for this application, and compare it to a harmonic resonator kicker.
	Poster TUPF10 [1.081 MB]
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WEXAUD02	Emittance Growth From Modulated Focusing and Bunched Beam Electron Cooling	electron, emittance, 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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WEXAUD04	Electron Cooling at GSI and FAIR – Status and Latest Activities	electron, experiment, proton, 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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THWCR04	RF Technologies for Ionization Cooling Channels	cavity, vacuum, electron, plasma	145
	B.T. Freemire, Y. Torun IIT, Chicago, Illinois, USA D.L. Bowring, A. Moretti, A.V. Tollestrup, K. Yonehara Fermilab, Batavia, Illinois, USA A.V. Kochemirovskiy University of Chicago, Chicago, Illinois, USA D. Stratakis BNL, Upton, Long Island, New York, USA
	Funding: Fermilab Research Alliance, LLC under Contract No. DE-AC02-07CH11359 Ionization cooling is the preferred method of cooling a muon beam for the purposes of a bright muon source. This process works by sending a muon beam through an absorbing material and replacing the lost longitudinal momentum with radio frequency (RF) cavities. To maximize the effect of cooling, a small optical beta function is required at the locations of the absorbers. Strong focusing is therefore required, and as a result normal conducting RF cavities must operate in external magnetic fields on the order of 10 Tesla. Vacuum and high pressure gas filled RF test cells have been studied at the MuCool Test Area at Fermilab. Methods for mitigating breakdown in both test cells, as well as the effect of plasma loading in the gas filled test cell have been investigated. The results of these tests, as well as the current status of the two leading muon cooling channel designs, will be presented.
	Slides THWCR04 [46.592 MB]
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THZAUD01	Crystalline Beam Studies with Andy Sessler	storage-ring, lattice, laser, focusing	155
	J. Wei FRIB, East Lansing, Michigan, USA X.-P. Li Skyworks Solutions, Inc., Newbury Park. California, USA H. Okamoto HU/AdSM, Higashi-Hiroshima, Japan
	Funding: Work supported by the U.S. Department of Energy Office of Science under Cooperative Agreement DE-SC0000661 and the National Science Foundation, under Cooperative Agreement PHY-1102511. For over two decades since 1992, Andy Sessler worked with us as a hobby on the topic of crystallization of charged ion beams and cooling methods. In this paper, we review the studies jointly performed with Andy highlighting major findings and challenges, and discuss current status and possible future topics and directions.
	Slides THZAUD01 [20.501 MB]
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Paper

Title

Other Keywords

Page

MOYAUD02

Stochastic Cooling of Heavy Ions in the HESR

heavy-ion, pick-up, impedance, target

15

R. Stassen, B. Breitkreutz, G. Schug, H. Stockhorst
FZJ, Jülich, Germany

Due to the modularized start version (MSV) of the FAIR project with the postponed NESR, the HESR (High Energy Storage Ring) became very attractive for experiments with heavy ions. Although the HESR is optimized for the storage of antiprotons it is also well suited for heavy-ion beams with slightly changes in the optics. Within the MSV only stochastic cooling and no e-cooling will be available, but even the main 2-4 GHz stochastic cooling system will be capable to fulfill the beam requirements for heavy ions. Most critical parts of the active elements are the high power amplifiers. The stochastic cooling amplifiers for the HESR will be based on new GaN devices. Nonlinearities of these devices necessitate a dedicated analysis for use in stochastic cooling systems.

Slides MOYAUD02 [5.720 MB]

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MOYAUD03

Stochastic Cooling System for HESR - Theoretical and Simulation Studies

pick-up, kicker, antiproton, target

20

H. Stockhorst, B. Lorentz, R. Maier, D. Prasuhn, R. Stassen
FZJ, Jülich, Germany
T. Katayama
Nihon University, Narashino, Chiba, Japan

The High-Energy Storage Ring (HESR) is part of the upcoming International Facility for Antiproton and Ion Research (FAIR) at GSI in Darmstadt. The HESR dedicates to the field of high-energy antiproton physics to explore the research areas of charmonium spectroscopy, hadronic structure, and quark-gluon dynamics with high-quality beams over a broad momentum range from 1.5 to 15 GeV/c. The facility provides the combination of powerful phase-space cooled antiproton beams and internal Pellet or gas jet targets to achieve the requirements of the experiment PANDA in terms of beam quality and luminosity. Recently, the feasibility of the HESR has been investigated for the application of cooled heavy ion beams with the special emphasis on the experimental program of the SPARC collaboration at FAIR. In this contribution an outline of the Fokker-Planck approach and particle tracking for momentum cooling assisted by a barrier bucket cavity with an internal target is given. A comparison of the filter and filter-less TOF cooling techniques including beam feedback is presented. Simulation and experimental studies at COSY to verify the predictions of the cooling theory complete the contribution.

Slides MOYAUD03 [4.508 MB]

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MOYAUD04

Stochastic Cooling Developments for the Collector Ring at FAIR

pick-up, antiproton, kicker, cryogenics

25

C. Dimopoulou, D. Barker, R.M. Böhm, R. Hettrich, W. Maier, C. Peschke, A. Stuhl, S. Wunderlich
GSI, Darmstadt, Germany
L. Thorndahl
CERN, Geneva, Switzerland

A Status report on the ongoing developments for the demanding stochastic cooling system of the Collector Ring is given. The system operates in the frequency band 1-2 GHz, it has to provide fast 3D cooling of antiproton, rare isotope and stable heavy ion beams. The main challenges are (i) the cooling of antiprotons by means of cryogenic movable pick-up electrodes and (ii) the fast two-stage cooling (pre-cooling by the Palmer method, followed by the notch filter method) of the hot rare isotope beams. Progress in designing, testing and integrating the hardware is discussed.

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MOPF05

A Cooling Storage Ring for an Electron-Ion Collider

electron, simulation, collider, booster

36

J. Gerity, P.M. McIntyre
Texas A&M University, College Station, USA

Electron cooling offers performance advantages to the design of an electron-ion collider. A first design of a 6 GeV/u storage ring for the cooling of ions in MEIC is presented, along with some remarks on the particulars of electron cooling in this ring.

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MOPF06

Quantification of the Electron Plasma in TItan's Cooler Penning Trap

electron, detector, plasma, TRIUMF

39

B.A. Kootte, B. Barquest, U. Chowdhury, J. Even, M. Good, A.A. Kwiatkowski, D. Lascar, K.G. Leach, A. Lennarz, D.A. Short
TRIUMF, Canada's National Laboratory for Particle and Nuclear Physics, Vancouver, Canada
M. Alanssari
Universität Muenster, Physikalisches Institut, Muenster, Germany
C. Andreoiu
SFU, Burnaby, BC, Canada
J. Bale, J. Dilling, A. Finlay, A.A. Gallant, E. Leistenschneider
UBC & TRIUMF, Vancouver, British Columbia, Canada
D. Frekers
Institut für Kernphysik, Westfälische Wilhelms-Universität Münster, Münster, Germany
G. Gwinner
University of Manitoba, Manitoba, Canada
R. Klawitter
Heidelberg University, Physics Institute, Heidelberg, Germany
T.T. Li
UW/Physics, Waterloo, Ontario, Canada
A.J. Mayer
University of Calgary, NW Calgary, Alberta, Canada
R. Schupp
MPI, Muenchen, Germany

Funding: Funded by Natural Sciences and Engineering Research Council of Canada (NSERC)
Modern rare isotope facilities provide beams of shortlived radionuclides primarily for studies in the field of nuclear structure, nuclear astrophysics, and low energy particle physics. At these facilities, many activities such as re-acceleration, improvement of resolving power, and precision experimental measurements require charge breeding of ions. However, the charge breeding process can increase the energy spread of an ion bunch, adversely affecting the experiment. A Cooler Penning Trap (CPET) is being developed to address such an energy spread by means of sympathetic electron cooling of the Highly Charged Ion bunches to . 1 eV/q. Recent work has focused on developing a strategy to effectively detect the trapped electron plasma without obstructing the passage of ions through the beamline. The first offline tests demonstrate the ability to trap and detect more than 10⁸ electrons. This was achieved by using a novel wire mesh detector as a diagnostic tool for the electrons.
* E.M. Burbidge et al, Rev Mod Phys, 29 547 (1957)
** V.V. Simon et al, Phys Rev C, 85 064308 (2012)
*** Z. Ke et al, Hyp Int, 173 103 (2006)
**** U. Chowdhury et al, AIP Conf Proc, 1640 120 (2015)

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MOPF12

N-body Code to Demonstrate Electron Cooling

electron, proton, 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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TUXAUD02

Project of Electron Cooler for NICA

electron, collider, solenoid, luminosity

82

I.N. Meshkov, E.V. Ahmanova, A.G. Kobets, O. Orlov, V.I. Shokin, A.A. Sidorin, S. Yakovenko
JINR, Dubna, Moscow Region, Russia
M.N. Kokurkin, N.Yu. Lysov
Allrussian Electrotechnical Institute, Moskow, Russia

The problems of development of high energy electron coolers are discussed on the basis of the existing experience. Necessities of electron cooling application to NICA collider are considered and the project parameters of the electron cooler at NICA collider are presented. Electron cooler of the NICA Collider is under design and development of its elements at JINR. It will provide the formation of an intense ion beam and maintain it in the electron energy range of 0.5'2.5 MeV. To achieve the required energy of the electrons all the elements of the Cooler are placed in the tanks filled with sulfur hexafluoride (SF6) gas under pressure of 6 atm. For testing the Cooler elements the test bench «Recuperator» is used and upgraded. The results of testing of the prototypes of the Cooler elements and the present stage of the technical design of the Cooler are described in this paper.

Slides TUXAUD02 [5.849 MB]

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TUYAUD03

Formation of Bunched Electron Beam at the Electron Cooler of CSRm

electron, controls, gun, cathode

85

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

The motivation for formation of bunched electron beam at the electron cooler of CSRm is based on the three requirements. Firstly, the high energy electron cooling, especially, the ion beam with TeV energy, the bunched electron beam for cooling would be easier than the DC operating mode. Secondly, the electric field induced by the intensity modulated electron beam will be used for the suppression of instability developed in the high intensity ion beam after accumulation with the help of electron cooling, Thirdly, the electron beam was required to turn on and off in the different period of the atomic physics experiments. Some initial design and consideration were presented in this paper. And also the current situation and condition of CSRm electron cooler were described here. An off-line testbench will be established in the laboratory, and the test and the optimization will be explored in this experimentation. The validity of this system will be verified in the near future. The procedure of the modulation on the voltage of control electrode in the electron gun of the CSRm cooler was discussed. The scheme of off-line measurement was devised according to the progress.

Slides TUYAUD03 [4.038 MB]

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TUZAUD03

Simulation Studies on Intensity Limitations of Laser Cooling at High Energy

laser, synchrotron, space-charge, scattering

93

L. Eidam, O. Boine-Frankenheim, D.F.A. Winters
GSI, Darmstadt, Germany

Within the FAIR project, laser cooling of highly intense, ultra relativistic ion beams will be attempted for the first time, and in a large (circumference 1084 m) and strong (max. magnetic rigidity 100 Tm) synchrotron, called "SIS100". Laser cooling of such ion beams should result in a further increase of the longitudinal phase space density and in non-Gaussian longitudinal beam profiles. For stable operation of such ion beams, and for optimization of the cooling process, both the laser force and the high-intensity effects have to be studied numerically in advance. The efficiency of laser cooling has been analyzed for different synchrotron frequency regimes. At high beam intensities, intra-beam scattering and space-charge effects have been found to counteract the laser cooling force. We will discuss how they influence the laser cooling efficiency and thus affect the cooling time.

Slides TUZAUD03 [5.044 MB]

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TUPF02

Development of the Electron Cooling Simulation Program for MEIC

electron, emittance, 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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TUPF09

Decoupling and Matching of Electron Cooling Section in the MEIC Ion Collider Ring

electron, solenoid, collider, coupling

116

G.H. Wei, F. Lin, V.S. Morozov, H. Zhang
JLab, Newport News, Virginia, USA

To get a luminosity level of 10³³ cm^-2 s^-1 at all design points of the MEIC, small transverse emittance is necessary in the ion collider ring, which is achieved by an electron cooling. And for the electron cooling, two solenoids are used to create a cooling environment of temperature exchange between electron beam and ion beam. However, the solenoids can also cause coupling and matching problem for the optics of the MEIC ion ring lattice. Both of them will have influences on the IP section and other areas, especially for the beam size, Twiss parameters, and nonlinear effects. A symmetric and flexible method is used to deal with these problems. With this method, the electron cooling section is merged into the ion ring lattice elegantly.

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TUPF10

Harmonic Stripline Kicker for MEIC Bunched Beam Cooler

kicker, electron, impedance, feedback

120

J. Guo, H. Wang
JLab, Newport News, Virginia, USA

Funding: Authored by Jefferson Science Associates, LLC under U.S. DOE Contract No. DE-AC05-06OR23177
In the current MEIC design, the ion collider ring needs to be cooled by a bunched electron beam of up to 200 mA 55 MeV, with the possibility to upgrade to 1.5 A. Although it's not impossible to design and build an ERL to provide such a beam, the technical risk and cost associated with such an ERL will be very high. An alternative is to recirculate the electron bunches in a ring for up to 25 turns until the bunch's quality is degraded, reducing the beam current in the ERL by a factor of 25. This scheme requires a pair of fast kickers that kick one in every 25 bunches. In this paper, we will analyze the electrodynamics of a harmonic stripline kicker for this application, and compare it to a harmonic resonator kicker.

Poster TUPF10 [1.081 MB]

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WEXAUD02

Emittance Growth From Modulated Focusing and Bunched Beam Electron Cooling

electron, emittance, 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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WEXAUD04

Electron Cooling at GSI and FAIR – Status and Latest Activities

electron, experiment, proton, 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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THWCR04

RF Technologies for Ionization Cooling Channels

cavity, vacuum, electron, plasma

145

B.T. Freemire, Y. Torun
IIT, Chicago, Illinois, USA
D.L. Bowring, A. Moretti, A.V. Tollestrup, K. Yonehara
Fermilab, Batavia, Illinois, USA
A.V. Kochemirovskiy
University of Chicago, Chicago, Illinois, USA
D. Stratakis
BNL, Upton, Long Island, New York, USA

Funding: Fermilab Research Alliance, LLC under Contract No. DE-AC02-07CH11359
Ionization cooling is the preferred method of cooling a muon beam for the purposes of a bright muon source. This process works by sending a muon beam through an absorbing material and replacing the lost longitudinal momentum with radio frequency (RF) cavities. To maximize the effect of cooling, a small optical beta function is required at the locations of the absorbers. Strong focusing is therefore required, and as a result normal conducting RF cavities must operate in external magnetic fields on the order of 10 Tesla. Vacuum and high pressure gas filled RF test cells have been studied at the MuCool Test Area at Fermilab. Methods for mitigating breakdown in both test cells, as well as the effect of plasma loading in the gas filled test cell have been investigated. The results of these tests, as well as the current status of the two leading muon cooling channel designs, will be presented.

Slides THWCR04 [46.592 MB]

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THZAUD01

Crystalline Beam Studies with Andy Sessler

storage-ring, lattice, laser, focusing

155

J. Wei
FRIB, East Lansing, Michigan, USA
X.-P. Li
Skyworks Solutions, Inc., Newbury Park. California, USA
H. Okamoto
HU/AdSM, Higashi-Hiroshima, Japan

Funding: Work supported by the U.S. Department of Energy Office of Science under Cooperative Agreement DE-SC0000661 and the National Science Foundation, under Cooperative Agreement PHY-1102511.
For over two decades since 1992, Andy Sessler worked with us as a hobby on the topic of crystallization of charged ion beams and cooling methods. In this paper, we review the studies jointly performed with Andy highlighting major findings and challenges, and discuss current status and possible future topics and directions.

Slides THZAUD01 [20.501 MB]

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