== "//Anomalous Beam Transport Through Gabor (Plasma) Lens Prototype//" ==

[https://doi.org/10.3390/app11104357 DOI: doi.org/10.3390/app11104357];[https://ccap.hep.ph.ic.ac.uk/trac/attachment/wiki/Communication/Notes/CCAP-TN-ACCL-06.pdf Preprint], [https://arxiv.org/abs/2104.05637 arXiv:2104.05637] \\

   '''Abstract'''::
   >''An electron plasma lens is a cost-effective, compact, strong-focusing element that can ensure efficient capture of low-energy proton and ion beams from laser-driven sources. A Gabor lens prototype was built for high electron density operation at Imperial College London. The parameters of the stable operation regime of the lens and its performance during a beam test with 1.4 MeV protons are reported here. Narrow pencil beams were imaged on a scintillator screen 67 cm downstream of the lens. The lens converted the pencil beams into rings that show position-dependent shape and intensity modulation that are dependent on the settings of the lens. Characterisation of the focusing effect suggests that the plasma column exhibited an off-axis rotation similar to the ''m=1'' diocotron instability. The association of the instability with the cause of the rings was investigated using particle tracking simulations.''\\


   '''Figures'''::

   [[Image(LensDiagram_v1_th.png)]]  '''Fig. 1''' [https://ccap.hep.ph.ic.ac.uk/trac/attachment/wiki/Communication/Publications/2021/GL_Beam_Experiment/LensDiagram_v1.pdf pdf] [https://ccap.hep.ph.ic.ac.uk/trac/attachment/wiki/Communication/Publications/2021/LensDiagram_v1.png png] \\

   [[Image(Detector_v3_th.png)]]  '''Fig. 2''' [https://ccap.hep.ph.ic.ac.uk/trac/attachment/wiki/Communication/Publications/2021/GL_Beam_Experiment/Detector_v3.pdf pdf] [https://ccap.hep.ph.ic.ac.uk/trac/attachment/wiki/Communication/Publications/2021/Detector_v3.png png] \\

   [[Image(Schematic_exp_th.png)]]  '''Fig. 3''' [https://ccap.hep.ph.ic.ac.uk/trac/attachment/wiki/Communication/Publications/2021/GL_Beam_Experiment/Schematic_exp.pdf pdf] [https://ccap.hep.ph.ic.ac.uk/trac/attachment/wiki/Communication/Publications/2021/Schematic_exp.png png] \\ 

   [[Image(Amplitude_th.png)]]  '''Fig. 4''' [https://ccap.hep.ph.ic.ac.uk/trac/attachment/wiki/Communication/Publications/2021/GL_Beam_Experiment/Amplitude.pdf pdf] [https://ccap.hep.ph.ic.ac.uk/trac/attachment/wiki/Communication/Publications/2021/Amplitude.png png] \\ 

   [[Image(Guildford_v2_th.png)]]  '''Fig. 5''' [https://ccap.hep.ph.ic.ac.uk/trac/attachment/wiki/Communication/Publications/2021/GL_Beam_Experiment/Guildford_v2.pdf pdf] [https://ccap.hep.ph.ic.ac.uk/trac/attachment/wiki/Communication/Publications/2021/Guildford_v2.png png] \\ 

   [[Image(Aperture_th.png)]]  '''Fig. 6''' [https://ccap.hep.ph.ic.ac.uk/trac/attachment/wiki/Communication/Publications/2021/GL_Beam_Experiment/Aperture.pdf pdf] [https://ccap.hep.ph.ic.ac.uk/trac/attachment/wiki/Communication/Publications/2021/Aperture.png png] \\ 

   [[Image(ScintillatorPhotoCombined_th.png)]]  '''Fig. 7''' [https://ccap.hep.ph.ic.ac.uk/trac/attachment/wiki/Communication/Publications/2021/GL_Beam_Experiment/ScintillatorPhotoCombined.pdf pdf] [https://ccap.hep.ph.ic.ac.uk/trac/attachment/wiki/Communication/Publications/2021/ScintillatorPhotoCombined.png png] \\ 

   [[Image(comparisonplotSurrey_th.png)]]  '''Fig. 8''' [https://ccap.hep.ph.ic.ac.uk/trac/attachment/wiki/Communication/Publications/2021/GL_Beam_Experiment/comparisonplotSurrey.pdf pdf] [https://ccap.hep.ph.ic.ac.uk/trac/attachment/wiki/Communication/Publications/2021/comparisonplotSurrey.png png] \\ 

   [[Image(3Spotand6SpotFlipped_v2_th.png)]]  '''Fig. 9''' [https://ccap.hep.ph.ic.ac.uk/trac/attachment/wiki/Communication/Publications/2021/GL_Beam_Experiment/3Spotand6SpotFlipped_v2.pdf pdf] [https://ccap.hep.ph.ic.ac.uk/trac/attachment/wiki/Communication/Publications/2021/3Spotand6SpotFlipped_v2.png png] \\ 

   [[Image(6spotlensonflipped_v2_th.png)]]  '''Fig. 10''' [https://ccap.hep.ph.ic.ac.uk/trac/attachment/wiki/Communication/Publications/2021/GL_Beam_Experiment/6spotlensonflipped_v2.pdf pdf] [https://ccap.hep.ph.ic.ac.uk/trac/attachment/wiki/Communication/Publications/2021/6spotlensonflipped_v2.png png] \\ 

   [[Image(GreyscaleSurface_Plot_of_Tuesday36cut_th.png)]]  '''Fig. 11''' [https://ccap.hep.ph.ic.ac.uk/trac/attachment/wiki/Communication/Publications/2021/GL_Beam_Experiment/GreyscaleSurface_Plot_of_Tuesday36cut.pdf pdf] [https://ccap.hep.ph.ic.ac.uk/trac/attachment/wiki/Communication/Publications/2021/GreyscaleSurface_Plot_of_Tuesday36cut.png png] \\ 

   [[Image(Dipole_instability_v2_th.png)]]  '''Fig. 12''' [https://ccap.hep.ph.ic.ac.uk/trac/attachment/wiki/Communication/Publications/2021/GL_Beam_Experiment/Dipole_instability_v2.pdf pdf] [https://ccap.hep.ph.ic.ac.uk/trac/attachment/wiki/Communication/Publications/2021/Dipole_instability_v2.png png] \\ 

   [[Image(Rings_hist_v3_th.png)]]  '''Fig. 13''' [https://ccap.hep.ph.ic.ac.uk/trac/attachment/wiki/Communication/Publications/2021/GL_Beam_Experiment/Rings_hist_v3.pdf pdf] [https://ccap.hep.ph.ic.ac.uk/trac/attachment/wiki/Communication/Publications/2021/Rings_hist_v3.png png] \\ 

   [[Image(GaborPlot_th.png)]]  '''Fig. 14''' [https://ccap.hep.ph.ic.ac.uk/trac/attachment/wiki/Communication/Publications/2021/GL_Beam_Experiment/GaborPlot.pdf pdf] [https://ccap.hep.ph.ic.ac.uk/trac/attachment/wiki/Communication/Publications/2021/GaborPlot.png png] \\ 

   [[Image(CentroidXVSCentroidY15kVNewScale_th.png)]]  '''Fig. 15''' [https://ccap.hep.ph.ic.ac.uk/trac/attachment/wiki/Communication/Publications/2021/GL_Beam_Experiment/CentroidXVSCentroidY15kVNewScale.pdf pdf] [https://ccap.hep.ph.ic.ac.uk/trac/attachment/wiki/Communication/Publications/2021/CentroidXVSCentroidY15kVNewScale.png png] \\ 

   [[Image(GaborPointsCombined2withlines_th.png)]]  '''Fig. 16''' [https://ccap.hep.ph.ic.ac.uk/trac/attachment/wiki/Communication/Publications/2021/GL_Beam_Experiment/GaborPointsCombined2withlines_.pdf pdf] [https://ccap.hep.ph.ic.ac.uk/trac/attachment/wiki/Communication/Publications/2021/GaborPointsCombined2withlines_.png png] \\ 

   [[Image(XYratioVScentroidX15kVNewScale_th.png)]]  '''Fig. 17''' [https://ccap.hep.ph.ic.ac.uk/trac/attachment/wiki/Communication/Publications/2021/GL_Beam_Experiment/XYratioVScentroidX15kVNewScale.pdf pdf] [https://ccap.hep.ph.ic.ac.uk/trac/attachment/wiki/Communication/Publications/2021/XYratioVScentroidX15kVNewScale.png png] \\