The NSCL reaccelerator scheme.
(a) Investigated magnetic field configurations. (b) Calculated acceptance as a function of beam emittance. For details, see text.
The electron gun. (a) Design cut view. (b) The core module containing the cathode and anode outside its soft-iron shell.
Extracted beam current as a function of extraction voltage, i.e., the difference between anode and cathode voltages. The curve is a power-3/2 fit to the data to extract the perveance of the electron gun, .
Calculated electron beam emission for the 6.35-mm-diameter cathode and acceleration to 5 keV into the magnetic field of the 0.2 T test coils.
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