The invention provides a beam
position detector used for an accelerator. By use of a
cylindrical electrode with an obliquely
cut end face, two parts with different area are allowed to appear on the surface of a
single electrode. When beams pass through the
detector and deflect towards one side with quite big area of one
electrode in an
electrode pair, sensing charges are gathered on the surface ofthe side of the
electrode in a geometrical multiples manner, and arranged axially, so induced
electromotive force is enhanced. Similarly, due to the separation of the beams,
voltage signals acquiredby the other electrode in the
electrode pair will be reduced in a geometrical multiples manner. In this way, in case of the same whole size of the
electrode pair, quite induced area of the electrode can be ensured, the output
voltage signals of the
detector are allowed to be strong; the good
linearity is achieved in the position of the beams. When the beams deflect,
electric signal difference values between different electrodes in the same group of electrode pairs are amplified, so deflection quantity of beams can be rapidly and precisely reflected. When the sensitivity is ensured, precision is improved, and the
detector is suitable for measurement of long beam groups or deflected beams.