Blocker rotary-switching device, control method thereof, and accelerator

A modifier rotary-switching device, comprising:

• a plurality of modifiers for changing dose distribution of rays output from an accelerating tube of an accelerator, the plurality of modifiers comprising modifiers which have different change amounts to the dose distribution;
• and
• a rotary switch installed with the plurality of modifiers and switching positions where the modifiers are installed by rotation so as to locate the modifier at an installation position corresponding to a target dose distribution at an outlet of the accelerating tube,
• wherein each of the plurality of modifiers is configured to allow the rays to pass through its solid material to obtain respective target dose distribution,
• wherein the modifier rotary-switching device further comprises a control module,
• the control module pre-stores corresponding relationship between the target dose distribution and the installation position of the modifier on the rotary switch, and based on the corresponding relationship, the control module outputs control instructions to the rotary switch,
• the rotary switch rotates based on the control instructions, so that the modifier at the installation position corresponding to the target dose distribution is located at the outlet of the accelerating tube.