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Ultra-cold electron target for the Heidelberg TSR

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Orlov,  D.
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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Lestinsky,  M.
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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Sprenger,  F.
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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Schwalm,  D.
Prof. Dirk Schwalm, Emeriti, MPI for Nuclear Physics, Max Planck Society;

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Wolf,  A.
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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Citation

Orlov, D., Lestinsky, M., Sprenger, F., Schwalm, D., Terekhov, A., & Wolf, A. (2006). Ultra-cold electron target for the Heidelberg TSR. In S. Nagaitsev, & R. J. Pasquinelli (Eds.), Beam cooling and related topics: International Workshop on Beam Cooling and Related Topics - COOL05, Galena, Illinois, U.S.A., 18 - 23 September 2005 (pp. 478-487). Melville, NY: American Inst. of Physics.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0011-86F5-A
Abstract
Merged beams experiments on inelastic electron-ion collisions in ion storage rings can reach very high energy resolution and offer fine control of the collision partners. To optimize the energy resolution, an electron target* was installed at the TSR in addition to the e-cooler. This made it possible to perform electron collision experiments at variable relative energy avoiding the resolution loss caused by the interruption of electron cooling. Furthermore, a strong gain in energy resolution was obtained by using a cryogenic electron source** developed for the TSR target. Here, a GaAs photocathode provides dc electron currents up to about 0.5 mA with an emission energy spread of about 10 meV. In first recombination measurements using this source, performed on HD+, H3+ and Sc18+, low energy resonant structures at milli-eV collision energies revealed unprecedented low transverse and longitudinal electron temperatures of about 0.5 meV and 0.025 meV, respectively. In this talk the performance of the TSR ultra-cold electron target is presented. In addition, the perspectives of photocathode-driven electron coolers operating at very low laboratory energies are discussed.