COOL2017 - List of Keywords (electron)

Paper	Title	Other Keywords	Page
TUM11	Low Energy Electron Cooler for the NICA Booster	ion, vacuum, gun, solenoid	22
	A.V. Bubley, M.I. Bryzgunov, V.A. Chekavinskiy, A.D. Goncharov, K. Gorchakov, I.A. Gusev, V.M. Panasyuk, V.V. Parkhomchuk, V.B. Reva, D.V. Senkov BINP SB RAS, Novosibirsk, Russia A.V. Smirnov JINR, Dubna, Moscow Region, Russia
	The low energy electron cooler for the NICA booster has recently been installed at the booster ring of the NICA facility. The article describes results of various measurements obtained during its commissioning. Also some details of design and construction of the cooler are discussed.
	Slides TUM11 [3.933 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-COOL2017-TUM11
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TUM21	High Voltage Cooler NICA Status and Ideas	ion, high-voltage, gun, collider	25
	V.B. Reva, M.I. Bryzgunov, A.V. Bubley, A.D. Goncharov, N.S. Kremnev, V.M. Panasyuk, V.V. Parkhomchuk, V.A. Polukhin, A.A. Putmakov BINP SB RAS, Novosibirsk, Russia
	The new accelerator complex NICA is designed at the Joint Institute for Nuclear Research (JINR, Dubna, Russia) to do experiment with ion-ion and ion-proton collision in the range energy 1-4.5 GeV/u. The planned luminosity in these experiments is 10²⁷cm^-2c{-1}. This value can be obtained with help of very short bunches with small transverse size. This beam quality can be realized with electron and stochastic cooling at energy of the physics experiment. The subject of the report is the problem of the technical feasibility of fast electron cooling for collider in the energy range between 0.2 and 2.5 MeV. For the realization of the cooler device BINP team proposes the design that is like to COSY cooler. The main features of this design are the accelerating tube immersed in the magnetic field along the whole length and the strong magnetic field in the cooling section. The physics of electron cooling is based on the idea of the fast magnetized cooling when the ion interacts with Larmour circle and the cooling decrements are improved significantly. The cooling force at strong magnet field was measured at many experiments and can be surely estimated.
	Slides TUM21 [50.456 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-COOL2017-TUM21
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TUM22	Model Development for the Automated Setup of the 2 MeV Electron Cooler Transport Channel	ion, dipole, operation, gun	28
	A.J. Halama, V. Kamerdzhiev FZJ, Jülich, Germany
	The 2 MeV electron cooler allows for cooling the proton and deuteron beams in the entire energy range of COSY and thereby study magnetized high energy electron cooling for the HESR and NICA. Manual electron beam adjustment in the high energy, high current regime proves a cumbersome and time consuming task. Special difficulties are presented by the particular geometry of the e-beam transport channel, limited beam diagnostics and general technical limitations. A model has been developed to track electrons through the transport channel of the cooler. This allows the offline study of response schemes around any particular setting of the cooler. It is envisaged to control linear, dipole and quadrupole behavior of the e-beam. Application of the model will result in optimized e-beam transport settings for a lossless and cool beam transport. This will improve cooling and recuperation efficiency and allow quick adjustment of the e-beam to the various operational modes of the machine. A good relative agreement of the model and the cooler could be shown. Main focus lies now in overhauling the software and finding suitable initial conditions to improve the agreement to an absolute degree.
	Slides TUM22 [3.784 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-COOL2017-TUM22
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TUP06	Stochastic Cooling as Wiener Process	ion, simulation, coherent-effects, incoherent-effects	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
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TUP08	Preliminary Design of Electron Target for SRing at HIAF	ion, target, experiment, cathode	40
	J. Li, Z. Huang, L.J. Mao, M.T. Tang, S. X. Wang, J.C. Yang, X.D. Yang, H. Zhao, L.X. Zhao IMP/CAS, Lanzhou, People's Republic of China
	A 13 Tm multifunction storage ring dedicated to nucleon and atomic experiment research - the SRing (Spectrometry Ring) is a significant part of the new heavy-ion research complex - HIAF (High Intensity heavy ion Accelerator Facility). In additional to an electron cooler and a gas internal target planned at the SRing, a beam of low temperature electron is also required to collide with the storage beam and to cool the decelerated ion beam at low energy. A magnetic adiabatic expansion is proposed to attain a low temperature by applying a 1.2 T longitudinal magnetic field upon the thermionic cathode at the electron gun. In this paper, preliminary design of the electron target is introduced.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-COOL2017-TUP08
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TUP09	Project of High-Voltage System with Fast Changing Potential for DR Experiment	ion, power-supply, high-voltage, feedback	44
	V.B. Reva, A.P. Denisov, V.V. Parkhomchuk, A.A. Putmakov, D.N. Skorobogatov BINP SB RAS, Novosibirsk, Russia J. Li, X. Ma, L.J. Mao IMP/CAS, Lanzhou, People's Republic of China
	Funding: The reported study was partially funded by RFBR 16-52-53016. A storage ring equipped with an electron cooler is an ideal platform for dielectronic recombination (DR)experiments. In order to fulfill the requirement of DR measurements the system of the precision control of the relative energy between the ion beam and the electron beam should be installed in the electron cooler device. This report describes the project of such system that is designed with section approach like COSY electron cooler. Each section consist of the section of cascade transformer and two power supplies for low and fast detuning of potential of high-voltage terminal. This project can be used in CSRe and future HIAF storage rings.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-COOL2017-TUP09
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TUP11	The Interaction Between Electrons and Ions in Comoving and Static Electron Columns	ion, proton, HOM, space-charge	47
	V.A. Britten, M. Droba, O. Meusel, H. Podlech, A. Schempp, K. Schulte IAP, Frankfurt am Main, Germany
	The interaction between electrons and positive ion beams and its application in accelerator physics are investigated. A space charge lens named Gabor lens was developed which confines electrons in a static column by external fields. The confined electrons are used for focusing and may support space charge compensation. In this structure the relative velocity between the ions and the electrons is maximal and corresponds to the beam velocity. An electron lens as at the Tevatron* is operated with a lower relative velocity in order to compensate the beam, to clean the beam abort gap or to excite the beam for beam dynamics measurements. In comparison electron cooling needs the same velocity of the ion and the electron beam. The following study contains the superposition of electric and magnetic self-fields and their impact on the density distribution of the ion beam and of the electron beam. Recombinations and ionisations are neglected. This is the beginning of an interface between these topics to find differences and similarities of the interaction between ions and electrons with different relative velocities. This may open up opportunities e.g. for the diagnostics of particle beams. * Shiltsev, Vladimir, et al. "Tevatron electron lenses: Design and operation." Physical Review Special Topics-Accelerators and Beams 11.10 (2008): 103501.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-COOL2017-TUP11
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TUP12	Simulation of Low Enery Ion Beam Cooling With Pulsed Electron Beam on CSRm	ion, simulation, 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
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TUP13	Calculations of the Gun and Collector for Electron Cooling Systems of HIAF	ion, gun, cathode, ECR	54
	M.T. Tang, J. Li, H.J. Lu, X.M. Ma, L.J. Mao, T.L. Yan, X.D. Yang, H. Zhao, L.X. Zhao IMP/CAS, Lanzhou, People's Republic of China A.V. Ivanov BINP SB RAS, Novosibirsk, Russia
	Two electron coolers are designed for the new project HIAF, one cooler with the highest energy 50keV is for the booster ring (BRing) to decreasing the transverse emittance of injected beams and another one with the highest energy 450keV is for the high precision Spec-trometer Ring (SRing). In this paper the results of the gun and collector simulation for these two electron coolers are presented. After optimization, the gun can produce 2A profile variable electron beam. The one time collecting efficiency is higher than 99.99%. The results of electron motions in toroid calculated by a numerical method are also summarized in this paper.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-COOL2017-TUP13
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TUP14	Investigation on the Suppression of Intrabeam Scattering in the High Intensity Heavy Ion Beam with the help of Longitudinal Multi-bunch Chain of Electron	ion, scattering, storage-ring, experiment	58
	X.D. Yang, J. Li, X.M. Ma, L.J. Mao, M.T. Tang, T.L. Yan, H. Zhao IMP/CAS, Lanzhou, People's Republic of China
	Intrabeam scattering is the main reason of degradation of the beam brightness and shortening of brightness lifetime in the collider, light source and storage ring. The intrabeam scattering presents dissimilar influence in the different facilities. Electron cooling was chose to suppress the effect of intrabeam scattering, another unexpected effect happened during the cooling. The distribution of ion beam quickly deviates from the initial Gaussian type, form a denser core and long tail. The ions standing in the tail of beam will loss soon due to large amplitude. This solution will focus on the investigation on the suppression of intrabeam scattering in the high intensity heavy ion beam in the storage ring with the help of longitudinally modulated electron beam. The stronger cooling was expected in the tail of ion beam and the weaker cooling was performed in the tail of ion beam. The particle in the outside will experience stronger cooling and will be driven back into the centre of ion beam. The ion loss will be decreased and the lifetime will be increased. The intensity of ion beam in the storage ring will be kept and maintain for long time.
	Poster TUP14 [4.160 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-COOL2017-TUP14
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TUP15	Experimental Demonstration of Electron Cooling with Bunched Electron Beam	ion, experiment, proton, storage-ring	61
	L.J. Mao, J. Li, X.M. Ma, M.T. Tang, J.C. Yang, X.D. Yang, H. Zhao, H.W. Zhao IMP/CAS, Lanzhou, People's Republic of China A. Hutton, K. Jordan, T. Powers, R.A. Rimmer, M. Spata, H. Wang, S. Wang, H. Zhang, Y. Zhang JLab, Newport News, Virginia, USA
	Funding: This work was supported by the Hundred Talents Project of the Chinese Academy of Sciences and National Natural Science Foundation of China (Nos. 11575264, 11475235, 11375245) Electron cooling at high energy is presently considered for several ion colliders, in order to achieve high luminosities by enabling a significant reduction of emittance of hadron beams. Electron beam at cooling channel in a few to tens MeV can be accelerated by a RF/SRF linac, and thus using bunched electrons to cool bunched ions. To study such cooling process, the DC electron gun of EC35 cooler was modified by pulsing the grid voltage, by which a 0.5-3.5 us of electron bunch length with a repetition frequency of less than 250 kHz was obtained. The first experiment demonstrated cooling coasting and bunched ion beam by a bunched electron beam was carried out at the storage ring CSRm at IMP. A preliminary data analysis has indicted the bunch length shrinkage and the momentum spread reduction of bunched 12C+6 ion beam. A longitudinal grouping effect of coasting ion beam by the electron bunch has also observed. In this paper, we will present the experiment result and its preliminary comparison to the simulation modeling.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-COOL2017-TUP15
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WEM12	Development of a Bunched Beam Electron Cooler Based on ERL and Circulator Ring Technology for the Jefferson Lab Electron-Ion Collider	ion, solenoid, simulation, 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
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WEM22	Status of Proof-of-Principle Experiment of Coherent Electron Cooling at BNL	ion, SRF, gun, FEL	77
	I. Pinayev, Z. Altinbas, R. Anderson, S.A. Belomestnykh, K.A. Brown, J.C.B. Brutus, A.J. Curcio, A. Di Lieto, C. Folz, D.M. Gassner, T. Hayes, R.L. Hulsart, P. Inacker, J.P. Jamilkowski, Y.C. Jing, D. Kayran, R. Kellermann, R.F. Lambiase, V. Litvinenko, G.J. Mahler, M. Mapes, A. Marusic, W. Meng, K. Mernick, R.J. Michnoff, K. Mihara, T.A. Miller, M.G. Minty, G. Narayan, P. Orfin, D. Phillips, T. Rao, D. Ravikumar, J. Reich, G. Robert-Demolaize, T. Roser, S.K. Seberg, F. Severino, B. Sheehy, K. Shih, J. Skaritka, L. Smart, K.S. Smith, L. Snydstrup, V. Soria, R. Than, C. Theisen, J.E. Tuozzolo, J. Walsh, E. Wang, G. Wang, D. Weiss, B. P. Xiao, T. Xin, W. Xu, A. Zaltsman, Z. Zhao BNL, Upton, Long Island, New York, USA C.H. Boulware, T.L. Grimm Niowave, Inc., Lansing, Michigan, USA J. Ma SBU, Stony Brook, New York, USA I. Petrushina SUNY SB, Stony Brook, New York, USA
	Funding: Work supported by the US Department of Energy under contract No. DE-SC0012704 The coherent electron cooling proof-of-principle experiment is aimed to demonstrate new technique suitable for cooling of the high energy protons and is essential for a future electron-hadron collider. In this paper we present the current status of the equipment, achieved beam parameters, and progress of the experiment. Future plans are also discussed.
	Slides WEM22 [3.473 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-COOL2017-WEM22
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Paper

Title

Other Keywords

Page

TUM11

Low Energy Electron Cooler for the NICA Booster

ion, vacuum, gun, solenoid

22

A.V. Bubley, M.I. Bryzgunov, V.A. Chekavinskiy, A.D. Goncharov, K. Gorchakov, I.A. Gusev, V.M. Panasyuk, V.V. Parkhomchuk, V.B. Reva, D.V. Senkov
BINP SB RAS, Novosibirsk, Russia
A.V. Smirnov
JINR, Dubna, Moscow Region, Russia

The low energy electron cooler for the NICA booster has recently been installed at the booster ring of the NICA facility. The article describes results of various measurements obtained during its commissioning. Also some details of design and construction of the cooler are discussed.

Slides TUM11 [3.933 MB]

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TUM21

High Voltage Cooler NICA Status and Ideas

ion, high-voltage, gun, collider

25

V.B. Reva, M.I. Bryzgunov, A.V. Bubley, A.D. Goncharov, N.S. Kremnev, V.M. Panasyuk, V.V. Parkhomchuk, V.A. Polukhin, A.A. Putmakov
BINP SB RAS, Novosibirsk, Russia

The new accelerator complex NICA is designed at the Joint Institute for Nuclear Research (JINR, Dubna, Russia) to do experiment with ion-ion and ion-proton collision in the range energy 1-4.5 GeV/u. The planned luminosity in these experiments is 10²⁷cm^-2c{-1}. This value can be obtained with help of very short bunches with small transverse size. This beam quality can be realized with electron and stochastic cooling at energy of the physics experiment. The subject of the report is the problem of the technical feasibility of fast electron cooling for collider in the energy range between 0.2 and 2.5 MeV. For the realization of the cooler device BINP team proposes the design that is like to COSY cooler. The main features of this design are the accelerating tube immersed in the magnetic field along the whole length and the strong magnetic field in the cooling section. The physics of electron cooling is based on the idea of the fast magnetized cooling when the ion interacts with Larmour circle and the cooling decrements are improved significantly. The cooling force at strong magnet field was measured at many experiments and can be surely estimated.

Slides TUM21 [50.456 MB]

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TUM22

Model Development for the Automated Setup of the 2 MeV Electron Cooler Transport Channel

ion, dipole, operation, gun

28

A.J. Halama, V. Kamerdzhiev
FZJ, Jülich, Germany

The 2 MeV electron cooler allows for cooling the proton and deuteron beams in the entire energy range of COSY and thereby study magnetized high energy electron cooling for the HESR and NICA. Manual electron beam adjustment in the high energy, high current regime proves a cumbersome and time consuming task. Special difficulties are presented by the particular geometry of the e-beam transport channel, limited beam diagnostics and general technical limitations. A model has been developed to track electrons through the transport channel of the cooler. This allows the offline study of response schemes around any particular setting of the cooler. It is envisaged to control linear, dipole and quadrupole behavior of the e-beam. Application of the model will result in optimized e-beam transport settings for a lossless and cool beam transport. This will improve cooling and recuperation efficiency and allow quick adjustment of the e-beam to the various operational modes of the machine. A good relative agreement of the model and the cooler could be shown. Main focus lies now in overhauling the software and finding suitable initial conditions to improve the agreement to an absolute degree.

Slides TUM22 [3.784 MB]

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TUP06

Stochastic Cooling as Wiener Process

ion, simulation, coherent-effects, incoherent-effects

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]

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TUP08

Preliminary Design of Electron Target for SRing at HIAF

ion, target, experiment, cathode

40

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

A 13 Tm multifunction storage ring dedicated to nucleon and atomic experiment research - the SRing (Spectrometry Ring) is a significant part of the new heavy-ion research complex - HIAF (High Intensity heavy ion Accelerator Facility). In additional to an electron cooler and a gas internal target planned at the SRing, a beam of low temperature electron is also required to collide with the storage beam and to cool the decelerated ion beam at low energy. A magnetic adiabatic expansion is proposed to attain a low temperature by applying a 1.2 T longitudinal magnetic field upon the thermionic cathode at the electron gun. In this paper, preliminary design of the electron target is introduced.

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TUP09

Project of High-Voltage System with Fast Changing Potential for DR Experiment

ion, power-supply, high-voltage, feedback

44

V.B. Reva, A.P. Denisov, V.V. Parkhomchuk, A.A. Putmakov, D.N. Skorobogatov
BINP SB RAS, Novosibirsk, Russia
J. Li, X. Ma, L.J. Mao
IMP/CAS, Lanzhou, People's Republic of China

Funding: The reported study was partially funded by RFBR 16-52-53016.
A storage ring equipped with an electron cooler is an ideal platform for dielectronic recombination (DR)experiments. In order to fulfill the requirement of DR measurements the system of the precision control of the relative energy between the ion beam and the electron beam should be installed in the electron cooler device. This report describes the project of such system that is designed with section approach like COSY electron cooler. Each section consist of the section of cascade transformer and two power supplies for low and fast detuning of potential of high-voltage terminal. This project can be used in CSRe and future HIAF storage rings.

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TUP11

The Interaction Between Electrons and Ions in Comoving and Static Electron Columns

ion, proton, HOM, space-charge

47

V.A. Britten, M. Droba, O. Meusel, H. Podlech, A. Schempp, K. Schulte
IAP, Frankfurt am Main, Germany

The interaction between electrons and positive ion beams and its application in accelerator physics are investigated. A space charge lens named Gabor lens was developed which confines electrons in a static column by external fields. The confined electrons are used for focusing and may support space charge compensation. In this structure the relative velocity between the ions and the electrons is maximal and corresponds to the beam velocity. An electron lens as at the Tevatron* is operated with a lower relative velocity in order to compensate the beam, to clean the beam abort gap or to excite the beam for beam dynamics measurements. In comparison electron cooling needs the same velocity of the ion and the electron beam. The following study contains the superposition of electric and magnetic self-fields and their impact on the density distribution of the ion beam and of the electron beam. Recombinations and ionisations are neglected. This is the beginning of an interface between these topics to find differences and similarities of the interaction between ions and electrons with different relative velocities. This may open up opportunities e.g. for the diagnostics of particle beams.
* Shiltsev, Vladimir, et al. "Tevatron electron lenses: Design and operation." Physical Review Special Topics-Accelerators and Beams 11.10 (2008): 103501.

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TUP12

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

ion, simulation, 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.

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TUP13

Calculations of the Gun and Collector for Electron Cooling Systems of HIAF

ion, gun, cathode, ECR

54

M.T. Tang, J. Li, H.J. Lu, X.M. Ma, L.J. Mao, T.L. Yan, X.D. Yang, H. Zhao, L.X. Zhao
IMP/CAS, Lanzhou, People's Republic of China
A.V. Ivanov
BINP SB RAS, Novosibirsk, Russia

Two electron coolers are designed for the new project HIAF, one cooler with the highest energy 50keV is for the booster ring (BRing) to decreasing the transverse emittance of injected beams and another one with the highest energy 450keV is for the high precision Spec-trometer Ring (SRing). In this paper the results of the gun and collector simulation for these two electron coolers are presented. After optimization, the gun can produce 2A profile variable electron beam. The one time collecting efficiency is higher than 99.99%. The results of electron motions in toroid calculated by a numerical method are also summarized in this paper.

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reference for this paper ※ https://doi.org/10.18429/JACoW-COOL2017-TUP13

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TUP14

Investigation on the Suppression of Intrabeam Scattering in the High Intensity Heavy Ion Beam with the help of Longitudinal Multi-bunch Chain of Electron

ion, scattering, storage-ring, experiment

58

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

Intrabeam scattering is the main reason of degradation of the beam brightness and shortening of brightness lifetime in the collider, light source and storage ring. The intrabeam scattering presents dissimilar influence in the different facilities. Electron cooling was chose to suppress the effect of intrabeam scattering, another unexpected effect happened during the cooling. The distribution of ion beam quickly deviates from the initial Gaussian type, form a denser core and long tail. The ions standing in the tail of beam will loss soon due to large amplitude. This solution will focus on the investigation on the suppression of intrabeam scattering in the high intensity heavy ion beam in the storage ring with the help of longitudinally modulated electron beam. The stronger cooling was expected in the tail of ion beam and the weaker cooling was performed in the tail of ion beam. The particle in the outside will experience stronger cooling and will be driven back into the centre of ion beam. The ion loss will be decreased and the lifetime will be increased. The intensity of ion beam in the storage ring will be kept and maintain for long time.

Poster TUP14 [4.160 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-COOL2017-TUP14

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TUP15

Experimental Demonstration of Electron Cooling with Bunched Electron Beam

ion, experiment, proton, storage-ring

61

L.J. Mao, J. Li, X.M. Ma, M.T. Tang, J.C. Yang, X.D. Yang, H. Zhao, H.W. Zhao
IMP/CAS, Lanzhou, People's Republic of China
A. Hutton, K. Jordan, T. Powers, R.A. Rimmer, M. Spata, H. Wang, S. Wang, H. Zhang, Y. Zhang
JLab, Newport News, Virginia, USA

Funding: This work was supported by the Hundred Talents Project of the Chinese Academy of Sciences and National Natural Science Foundation of China (Nos. 11575264, 11475235, 11375245)
Electron cooling at high energy is presently considered for several ion colliders, in order to achieve high luminosities by enabling a significant reduction of emittance of hadron beams. Electron beam at cooling channel in a few to tens MeV can be accelerated by a RF/SRF linac, and thus using bunched electrons to cool bunched ions. To study such cooling process, the DC electron gun of EC35 cooler was modified by pulsing the grid voltage, by which a 0.5-3.5 us of electron bunch length with a repetition frequency of less than 250 kHz was obtained. The first experiment demonstrated cooling coasting and bunched ion beam by a bunched electron beam was carried out at the storage ring CSRm at IMP. A preliminary data analysis has indicted the bunch length shrinkage and the momentum spread reduction of bunched 12C+6 ion beam. A longitudinal grouping effect of coasting ion beam by the electron bunch has also observed. In this paper, we will present the experiment result and its preliminary comparison to the simulation modeling.

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WEM12

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

ion, solenoid, simulation, 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]

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WEM22

Status of Proof-of-Principle Experiment of Coherent Electron Cooling at BNL

ion, SRF, gun, FEL

77

I. Pinayev, Z. Altinbas, R. Anderson, S.A. Belomestnykh, K.A. Brown, J.C.B. Brutus, A.J. Curcio, A. Di Lieto, C. Folz, D.M. Gassner, T. Hayes, R.L. Hulsart, P. Inacker, J.P. Jamilkowski, Y.C. Jing, D. Kayran, R. Kellermann, R.F. Lambiase, V. Litvinenko, G.J. Mahler, M. Mapes, A. Marusic, W. Meng, K. Mernick, R.J. Michnoff, K. Mihara, T.A. Miller, M.G. Minty, G. Narayan, P. Orfin, D. Phillips, T. Rao, D. Ravikumar, J. Reich, G. Robert-Demolaize, T. Roser, S.K. Seberg, F. Severino, B. Sheehy, K. Shih, J. Skaritka, L. Smart, K.S. Smith, L. Snydstrup, V. Soria, R. Than, C. Theisen, J.E. Tuozzolo, J. Walsh, E. Wang, G. Wang, D. Weiss, B. P. Xiao, T. Xin, W. Xu, A. Zaltsman, Z. Zhao
BNL, Upton, Long Island, New York, USA
C.H. Boulware, T.L. Grimm
Niowave, Inc., Lansing, Michigan, USA
J. Ma
SBU, Stony Brook, New York, USA
I. Petrushina
SUNY SB, Stony Brook, New York, USA

Funding: Work supported by the US Department of Energy under contract No. DE-SC0012704
The coherent electron cooling proof-of-principle experiment is aimed to demonstrate new technique suitable for cooling of the high energy protons and is essential for a future electron-hadron collider. In this paper we present the current status of the equipment, achieved beam parameters, and progress of the experiment. Future plans are also discussed.

Slides WEM22 [3.473 MB]

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