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Residual-gas luminescence of argon during electron cloud confinement with GL settings: Φ A = 6 kV, B z = 18 mT.
Source publication
Various Gabor-Lenses (GL) were investigated at Goethe University. Confinements of sufficient electron densities (n e ∼ 1 ⋅ 10 15 m 3) were reached without any external source of electrons. Focusing of ion beams by low energy was demonstrated, long term stability and reproducibility were approved. Main differences compared to experiments and investi...
Context in source publication
Context 1
... a Gabor-Lens depending on its geometry. For GL2000 the OF is shown in Fig. 3. In the first run of GL2000 argon gas was used as residual gas at a pressure of 1 ⋅ 10 −5 hPa. The magnetic field was adjusted at 18 mT. After applying an anode voltage the CCD camera observed immediately a residual gas fluorescence induced by the confined electrons, see Fig. 4. Assuming that the excited state of the atoms has a short lifetime and the argon gas is distributed homogeneously, the luminescence represents the electron density distribution within the GL. In addition to the excitation, electron impact ionization ...
Similar publications
Various Gabor-Lenses (GL) were investigated at Goethe University. Confinements of sufficient electron densities (n e ∼ 1 · 10 ¹⁵ m ³ ) were reached without any external source of electrons. Focusing of ion beams by low energy was demonstrated, long term stability and reproducibility were approved. Main differences compared to experiments and invest...
Citations
... This is achieved by confining an electron column inside a cavity trough a superposition of electric and magnetic field along the logitudinal direction of beam propagation (see Fig. 2). For more details on GLs in general see [3]. As a result the positive space charge, which forces the beam to continously drift apart, is overcompensated by the electron density in the GL. ...
First investigations on Gabor Lens GL2000 at Goethe University have shown that it is possible to confine a 2m long stable Electron Plasma Column and to apply it as a hadron beam focusing device. With this knowledge theoretical implementations of GLs in final focus and transfer lines have started. The focusing with GLs is a weak but smooth focusing in radial direction. The GL is a suitable and inexpensive choice in addition to the existing focusing elements eg. magnetic quadrupoles. The device helps to improve beam quality and minimize losses over long distances. The investigation of relativistic hadron beams in GeV range using the example of the proposed NA61/SHINE VLE-beamline at CERN is carried out and will be presented.
