The CAMV electron apparatus was designed and constructed to enable CCD ( charge-coupled device ) camera images of the two-dimensional flows which cause rapid cross-field transport of particles and energy. The apparatus is ideallysuited to studies of 2D fluid instabilities, turbulence, and relaxation, inboth effectively inviscid and viscous regimes.
CAMV is essentially a Penning trap with a CCD camera attached to one end.Electrons are emitted from a tungsten filament source located at theopposite end from the camera. The electrons are attracted into thecontainment section by a positive potential at the collimator end, where they are contained radially by a magnetic field and axially by negative potentials at the collimator end and the source end.
While in the containment section, the behavior of the plasma can be influencedby asymmetrical potentials on some of the electrodes. For instance, a plasmawith an m=1 diocotron (MPEG) mode canbe created. The plasma is contained until it reaches an interesting pointin its development, whereupon it is allowed to escape through the analyzer.After passing through the analyzer, the electrons in the plasma collide witha phosphor screen. The resulting light is imaged by the camera.
Sean Simmons
smspla@sdphca.ucsd.edu