Abstract: A particle accelerator includes: a pair of magnetic poles disposed to face each other; a coil which surrounds each of the magnetic poles and generates a first magnetic flux density directing from the magnetic pole on one side to the magnetic pole on the other side; a foil stripper provided on a circling orbit of charged particles to strip off electrons from the charged particles; and a magnetic flux density adjustment unit which generates a second magnetic flux density directing in an opposite direction to a direction of the first magnetic flux density, in which the magnetic flux density adjustment unit makes an absolute value of magnetic flux density at a position of the foil stripper when viewed in a plan view smaller than an absolute value of the first magnetic flux density.

Abstract: There is provided a charged particle beam treatment apparatus including an accelerator configured to emit a charged particle beam by accelerating a charged particle, an irradiation unit configured to irradiate an irradiation target with the charged particle beam, a beam transport line configured to transport the charged particle beam emitted from the accelerator, to the irradiation unit, a first dose measurement unit that is disposed inside the irradiation unit so as to measure a first dose of the charged particle beam, and a second dose measurement unit that is disposed in the beam trans port line so as to measure a second dose of the charged particle beam. A response frequency of the second dose measurement unit is higher than a response frequency of the first dose measurement unit.

Abstract: A particle accelerator includes: a pair of magnetic poles disposed to face each other; a coil which surrounds each of the magnetic poles and generates a first magnetic flux density directing from the magnetic pole on one side to the magnetic pole on the other side; a foil stripper provided on a circling orbit of charged particles to strip off electrons from the charged particles; and a magnetic flux density adjustment unit which generates a second magnetic flux density directing in an opposite direction to a direction of the first magnetic flux density, in which the magnetic flux density adjustment unit makes an absolute value of magnetic flux density at a position of the foil stripper when viewed in a plan view smaller than an absolute value of the first magnetic flux density.

Abstract: There is provided a charged particle beam treatment apparatus including an accelerator configured to emit a charged particle beam by accelerating a charged particle, an irradiation unit configured to irradiate an irradiation target with the charged particle beam, a beam transport line configured to transport the charged particle beam emitted from the accelerator, to the irradiation unit, a first dose measurement unit that is disposed inside the irradiation unit so as to measure a first dose of the charged particle beam, and a second dose measurement unit that is disposed in the beam trans port line so as to measure a second dose of the charged particle beam. A response frequency of the second dose measurement unit is higher than a response frequency of the first dose measurement unit.