The drift motion of cooling electrons makes them able to respond to transverse perturbations of a cooled ion beam. This response may lead to dipole or quadrupole transverse instabilities at specific longitudinal wave numbers. While the dipole instabilities can be suppressed by a combination of the Landau damping, machine impedance, and the active damper, the quadrupole and higher order modes can lead to either emittance growth, or a lifetime degradation, or both. The growth rates of these instabilities are strongly determined by the machine x-y coupling. Thus, tuning out of the coupling resonance and/or reduction of the machine coupling can be an efficient remedy for these instabilities.

/pdf/two-beam-instability-in-electron-cooling-4m3lsq8qui.pdf

Two-Beam Instability in Electron Cooling

New developments in beam cooling since ICFA'2004 seminar are presented with concentration on trends in electron cooling, stochastic cooling, muon cooling and beam crystallization − the trends, which, as one can expect, will mark the future in the cooling methods applications.

New advances in beam cooling

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.

FORMATION OF BUNCHED ELECTRON BEAM AT THE ELECTRON COOLER OF CSRm

Storage rings operating at ultra-low energies and in particular electrostatic storage rings have proven to be invaluable tools for atomic and molecular physics. Due to the mass independence of the electrostatic rigidity, these machines are able to store a wide range of different particles, from light ions to heavy singly charged bio-molecules. However, earlier measurements showed strong limitations on beam intensity, fast decay of ion current, reduced life time etc. The nature of these effects was not fully understood. Also a large variety of experiments in future generation ultra-low energy storage and decelerator facilities including in-ring collision studies with a reaction microscope require a comprehensive investigation of the physical processes involved into the operation of such rings.

https://wwwinfo.jinr.ru/publish/Pepan/2014-v45/v-45-2/03_pap.pdf

Beam dynamics in an ultra-low energy storage rings (review of existing facilities and feasibility studies for future experiments)

Brief review of experimental studies of the electron cooling of a proton beam at COSY (Juelich, Germany) and S-LSR (Kyoto) are presented. Intensity of the proton beam is limited by two general effects: particle loss directly after the injection and development of instability in a deep cooled ion beam. Results of the instability investigations and the methods of the instability suppression, which allow increasing the cooled beam intensity, are described. Recent attempts of proton beam ordering in both rings are presented and discussed as well. This work is supported by RFBR grant # 05-02-16320 and INTAS grant #03-54-5584.

Electron cooling of proton beam in cosy and s-lsr

Results of experimental studies of the electron cooling of a proton beam at COSY (Juelich, Germany) are presented. Intensity of the proton beam is limited by two general effects: particle loss directly after the injection and development of instability in a deep cooled ion beam. Results of the instability investigations performed at COSY during last years are presented in this report in comparison with previous results from HIMAC (Chiba, Japan) CELSIUS (Uppsala, Sweden) and LEAR (CERN). Methods of the instability suppression, which allow increasing the cooled beam intensity, are described. This work is supported by RFBR grant ♯ 05‐02‐16320 and INTAS grant ♯03‐54‐5584.

Electron Cooling of Intense Ion Beam

Results of experimental studies of the electron cooling of a proton beam at COSY (Juelich, Germany) and an ion beam at HIMAC (Chiba, Japan) are presented. Intensity of the ion beam is limited by two general effects: particle loss directly after the injection and development of instability in a deep cooled ion beam. Methods of the instability suppression, which allow increasing the cooled beam intensity, are described.

Intensive Ion Beams in Storage Rings with Electron Cooling

Recent results of electron cooling of proton beams at COSY-Juelich are reported. Cooling at an electron energy of 70 keV has been studied for the first time. At the injection energy level of COSY, corresponding to 24.5 keV electron energy, the features of the cooled proton beam at extremely low intensities have been investigated in order to find out whether an ordering of the proton beam can be achieved. Such investigations are motivated by the results of a numerical simulation of the ordering process by the BETACOOL code.

New experimental results on electron cooling at cosy

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Electron Cooling of Intense Ion Beam

Intensive Ion Beams in Storage Rings with Electron Cooling

Electron cooling of proton beam in cosy and s-lsr

New experimental results on electron cooling at cosy