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-              v18
+              v19
 We use a [http://www.peabody-scientific.com/ Peabody Scientific] Duoplasmatron ion source to produce our H^-^ beam.
+The Source is a three element arc discharge device with high efficiency ionization. An arc discharge is focused by a
+somewhat conical intermediate electrode between a cathode and anode. An axial magnetic field constricts electrons
+from the cathode to spiral a longer path through the discharge, increasing the ionization efficiency. For negative ion beam
+production the intermediate electrode is offset from the anode aperture because the periphery of the arc discharge is rich in
+negative ions.
 == Wien Filter ==