ELECTROMAGNETIC QUADRUPOLE CIRCUIT WHICH INDEPENDENTLY CORRECTS AC AND DC COMPONENTS OF CORRECTION CURRENT

摘要

An electromagnetic quadrupole circuit capable of always performing the optimal correction of the spot form is provided with: a current detecting means 20 for detecting the peak value and bottom value of current flowing along an electromagnetic quadrupole coil 8; a control means 50 for supplying a prescribed peak control value and a prescribed bottom control value; a first power source 16 for controlling the feedback of the amount of supply current based on the peak value detected by the current detecting means 20 and the peak control value supplied from the control means 50; and a second power source 17 for controlling the feedback of the amount of supply current based on the bottom value detected by the current detecting means 20 and the bottom control value supplied from the control means 50.