extraction lens造句

A secondary ion mass spectrometer consists of ( 1 ) a primary ion gun generating the primary ion beam, ( 2 ) a primary ion column, accelerating and focusing the beam onto the sample ( and in some devices an opportunity to separate the primary ion species by Wien filter or to pulse the beam ), ( 3 ) high vacuum sample chamber holding the sample and the secondary ion extraction lens, ( 4 ) a mass analyser separating the ions according to their mass to charge ratio, and ( 5 ) a detector.
It's difficult to find extraction lens in a sentence. 用extraction lens造句挺难的