US 7,755,305 B2 · Charged particle beam extraction system and method

Abstract

A charged particle beam extraction system and method capable of shortening the irradiation time and increasing the number of patients treatable per unit time. The charged particle beam extraction system comprises a synchrotron for cyclically performing patterned operation including four steps of introducing, accelerating, extracting and decelerating an ion beam, an on/off switch for opening or closing connection between an RF knockout electrode and an RF power supply for applying RF power to the RF knockout electrode, and a timing controller for controlling on/off-timing of the on/off switch such that when extraction of the ion beam is stopped at least once during the extraction step of the synchrotron, an amount of the ion beam extracted from the synchrotron in one cycle is held substantially at a setting value.

Claims12

Dependent claims

A charged particle beam extraction system for extracting a charged particle beam through an irradiation device, said charged particle beam extraction system comprising:

an accelerator for cyclically performing patterned operation including steps of introducing, accelerating and extracting the charged particle beam;
an amount-of-extracted beam adjusting unit for changing an amount of the charged particle beam extracted from said accelerator;
and
a control unit for controlling said amount-of-extracted beam adjusting unit such that when extraction of the charged particle beam is stopped at least once during the extraction step of said accelerator, the amount of the charged particle beam extracted from said accelerator in one cycle is held substantially at a setting value of the amount of extracted beam.

1 more element

Dependencies are inferred from the claim text.

Charged particle beam extraction system and method

Life of this patent

Charged particle beam extraction system and method

Life of this patent

Abstract

Claims12