Insertable target holder for solid dopant materials

An indirectly heated cathode ion source, comprising:

• an arc chamber, comprising a plurality of walls connecting a first end and a second end;
• an indirectly heated cathode disposed on the first end of the arc chamber;
• and
• a target holder, having an enclosed pocket to hold a dopant material such that the dopant material is not exposed to a plasma generated in the arc chamber, wherein the target holder is oriented in the arc chamber so that gravity retains the dopant material in the target holder, the target holder entering the arc chamber through one of the plurality of walls, having a first position where the enclosed pocket is outside the arc chamber and a second position where at least a portion of the enclosed pocket is disposed in the arc chamber such that the plasma heats the dopant material in the enclosed pocket.