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TUPM2HA02 |
Commissioning of the 2 MeV COSY Electron Cooler in Jülich |
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- V. Kamerdzhiev, L.J. Mao
FZJ, Jülich, Germany
- J. Dietrich
DELTA, Dortmund, Germany
- J. Dietrich
HIM, Mainz, Germany
- L.J. Mao
IMP, Lanzhou, People's Republic of China
- V.V. Parkhomchuk, V.B. Reva
BINP SB RAS, Novosibirsk, Russia
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The construction of the 2 MeV electron cooler at BINP has been completed. After initial testing, the cooler was shipped to Jülich. The installation in COSY is scheduled to begin in April 2013. The report covers the installation and commissioning progress in Jülich. The history of the project is briefly touched on.
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Slides TUPM2HA02 [4.490 MB]
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| WEPPO13 |
Simulation Study of Beam Cooling with Electron Energy Modulation |
124 |
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- L.J. Mao
FZJ, Jülich, Germany
- J. Dietrich
HIM, Mainz, Germany
- J. Dietrich
DELTA, Dortmund, Germany
- J. Li, X.D. Yang
IMP, Lanzhou, People's Republic of China
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The electron cooling is less efficient for hot ion beam because the cooling force reduces rapidly at high electron-ion relative velocity. A possibility of electron cooling for ion beam with large velocity spread was studied by simulation. The electron beam velocity swept through the ion velocity distribution during cooling procedure. The average friction force will be increased at high electron-ion relative velocity range. The results show a fast beam distribution shrinking could be achieved through the electron energy sweep method. The cooling time dependence on the modulation frequency and amplitude was investigated by simulation. The simulation results also show different ion beam longitudinal velocity distribution can be produced via electron energy modulation.
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| TUAM2HA03 |
Electron Cooler R&D at Helmholtz-Institut Mainz |
65 |
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- K. Aulenbacher, M.W. Bruker, J. Dietrich, S. Friederich, A. Hofmann, T. Weilbach
HIM, Mainz, Germany
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Funding: Helmholtz Gesllschaft deutscher Forschungszentren
The Accelerator group at Helmholtz Institut Mainz supports the construction of the HESR storage ring at FAIR. One of our main goals is to contribute to the development of a magnetized electron cooler for the energy range between 4 and 8 MeV, allowing to cool antiprotons up to maximum momentum available at HESR. Technical challenges include handling the beam current, extreme collector efficiency and non-invasive beam diagnostics. Furthermore, the powering of solenoids in the acceleration channel is still object to R&D. The status of the aforementioned topics is summarized and an outline of the plans for the future is given.
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Slides TUAM2HA03 [2.218 MB]
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| WEPPO03 |
Operational Experience with the HESR Electron Cooler Test Set-up |
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- M.W. Bruker, K. Aulenbacher, J. Dietrich, S. Friederich, A. Hofmann, T. Weilbach
HIM, Mainz, Germany
- K. Aulenbacher
IKP, Mainz, Germany
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The electron cooler test set-up built at Helmholtz-Institut Mainz as a feasibility study for the electron cooling device at the High Energy Storage Ring (HESR) at FAIR has been set in operation. One of the main goals of the test set-up is to evaluate the gun design proposed by TSL (Uppsala) with respect to vacuum handling, EM fields and the resulting beam parameters. Another purpose of the set-up is to achieve an energy recuperation efficiency of 1 - 10-5. To measure this quantity, a Wien filter will be employed, which will also prove capable of mitigating collection losses. Recent developments and operational experiences with the test set-up will be presented.
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Poster WEPPO03 [4.290 MB]
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| WEPPO05 |
Powering of the HV-Solenoids at the HESR Electron Cooler |
107 |
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- A. Hofmann, K. Aulenbacher, M.W. Bruker, J. Dietrich, S. Friederich, T. Weilbach
HIM, Mainz, Germany
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The experiments at the planned 'High Energy Storage Ring' (HESR) require magnetised electron cooling. One of the challenges is the powering of the HV-solenoids, which are located on so-called separation boxes inside a high voltage vessel. Because the separation boxes sit on electrical potential, a floating power supply for the HV-solenoids is needed. A currently discussed concept is the use of turbo generators. The turbo generators, an assembly of a turbine and an electrical generator, will also be used as floating supply for a cascade generator generating the potential difference between the individual separation boxes. The turbine is powered by gas, e.g. dry air or -preferantially - sulphur hexafluoride, under high pressure, consequently driving the generator which delivers an electrical power of 5 kW. The high pressure gas could be generated outside the high voltage vessel and guided to the turbine afterwards. The presentation gives an overview of the turbo generator project: an introduction, a status report and a road map will be given.
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Poster WEPPO05 [3.402 MB]
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| WEPPO13 |
Simulation Study of Beam Cooling with Electron Energy Modulation |
124 |
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- L.J. Mao
FZJ, Jülich, Germany
- J. Dietrich
HIM, Mainz, Germany
- J. Dietrich
DELTA, Dortmund, Germany
- J. Li, X.D. Yang
IMP, Lanzhou, People's Republic of China
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The electron cooling is less efficient for hot ion beam because the cooling force reduces rapidly at high electron-ion relative velocity. A possibility of electron cooling for ion beam with large velocity spread was studied by simulation. The electron beam velocity swept through the ion velocity distribution during cooling procedure. The average friction force will be increased at high electron-ion relative velocity range. The results show a fast beam distribution shrinking could be achieved through the electron energy sweep method. The cooling time dependence on the modulation frequency and amplitude was investigated by simulation. The simulation results also show different ion beam longitudinal velocity distribution can be produced via electron energy modulation.
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