Sentence:  After the ion source, the facility uses a Pretzel magnet (Knies et al., 1997a) to act as a unique <WSD>recombinator</WSD> to simultaneously transmit from 1 to 200 amu ions but attenuate intense matrix-related beams. 
Meaning of the word marked with <WSD> tags:  Anything that serves to recombine a set of elements.