Cold Photocathode Electron Sources and Perspectives for Low-Energy Magnetically Guided Electron Beams
- Max-Planck-Institut fuer Kernphysik, 69117 Heidelberg (Germany)
Cold electron beams from a cryogenic GaAs photocathode source, developed for the electron target of the Heidelberg TSR, will serve as a major tool to cool the ions and to study electron-ion interactions at the low-energy electrostatic Cryogenic Storage Ring which will be built in the institute. The photocathode source delivers electrons within emission energy spreads of about 10 meV allowing to reach low longitudinal and transverse temperatures of magnetized electron beams of eV energies and finally to improve cooling rates and the energy resolution in merged beam experiments. We propose a new electron-ion merging scheme for a low-energy cooler which improves magnetic field homogeneity in the beam merging area and, in contrast to standard schemes, does not deteriorate the dynamics of the low-energy ions in the ring through non-linear coupling. Even for 20 keV protons, magnetic guiding fields of about 50 G, as is required to suppress electron temperature heating, can be used this way. The electric and magnetic fields of the individual elements of the ring and cooler were calculated with the TOSCA code and models of the entire ring were simulated by particle tracking.
- OSTI ID:
- 20891695
- Journal Information:
- AIP Conference Proceedings, Vol. 862, Issue 1; Conference: Non-neutral plasma physics VI: Workshop on non-neutral plasmas 2006, Aarhus (Denmark), 25-29 Jun 2006; Other Information: DOI: 10.1063/1.2387933; (c) 2006 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
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