A method to suppress dielectric breakdowns in liquid argon ionization   detectors for cathode to ground distances of several millimeters
  We present a method to reach electric field intensity as high as 400 kV/cm in liquid argon for cathode-ground distances of several millimeters. This can be achieved by suppressing field emission from the cathode, overcoming limitations that we reported earlier. 
M. Auger, A. Ereditato, D. Goeldi, S. Janos, I. Kreslo, M. Luethi, C.   Rudolf von Rohr, T. Strauss, T. Tolba and M. S. Weber
physics.ins-det hep-ex