Charged particles here indicate electrically charged particles while they are generally referred to as particles holding an electric charge. They are popularly used for ion beams and electron beams as charged particle beams.
The electrostatic deflection is to deflect the beam under the control of electric field. In the deflection process, the high voltage is applied to the electrode of the line to cast the beam. Then, the electric field is produced to deflect the beam. Our high voltage power supplies are available for applying the high voltage to the electrode (electrostatic lens).

Internal Structure of cathode-ray oscilloscope, C.R.O.
Related words:
  • Electrostatic Deflection of Charged Particle Beams