H ELECTRICITY
H01 ELECTRIC ELEMENTS
H01J ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
H01J2237/00 Discharge tubes exposing object to beam, e.g. for analysis treatment, etching, imaging
H01J2237/248 Components associated with the control of the tube
H01J2237/2485 Electric or electronic means
H01J2237/2487 using digital signal processors