Sentence:  This leaves two strategies to increase the current in a positron beam. First is to provide a stronger positron source and second is to develop a more efficient method to <WSD>moderate</WSD> the source positrons into a monoenergetic beam. / To <WSD>moderate</WSD> stiff minds disposed to strive. 
Meaning of the word marked with <WSD> tags:  To reduce the excessiveness of (something)