title: Development of C⁶⁺ laser ion source and RFQ linac for carbon ion radiotherapy.
abstract: A prototype C(6+) injector using a laser ion source has been developed for a compact synchrotron dedicated to carbon ion radiotherapy. The injector consists of a laser ion source and a 4-vane radio-frequency quadrupole (RFQ) linac. Ion beams are extracted from plasma and directly injected into the RFQ. A solenoid guides the low-energy beams into the RFQ. The RFQ is designed to accelerate high-intensity pulsed beams. A structure of monolithic vanes and cavities is adopted to reduce its power consumption. In beam acceleration tests, a solenoidal magnetic field set between the laser ion source and the RFQ helped increase both the peak currents before and after the RFQ by a factor of 4.
authors.affiliation: Toshiba Corporation, Yokohama 235-8522, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Sako
authors.affiliation: Toshiba Corporation, Yokohama 235-8522, Japan.
authors.forename: A
authors.initials: A
authors.lastname: Yamaguchi
authors.affiliation: Toshiba Corporation, Yokohama 235-8522, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Sato
authors.affiliation: Cancer Research Center, Yamagata University Faculty of Medicine, Yamagata 990-9585, Japan.
authors.forename: A
authors.initials: A
authors.lastname: Goto
authors.affiliation: Cancer Research Center, Yamagata University Faculty of Medicine, Yamagata 990-9585, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Iwai
authors.affiliation: Cancer Research Center, Yamagata University Faculty of Medicine, Yamagata 990-9585, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Nayuki
authors.affiliation: Cancer Research Center, Yamagata University Faculty of Medicine, Yamagata 990-9585, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Nemoto
authors.affiliation: Cancer Research Center, Yamagata University Faculty of Medicine, Yamagata 990-9585, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Kayama
authors.affiliation: Accelerator Engineering Corporation, Chiba 263-0043, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Takeuchi
mesh_terms: D002244:Carbon; D007834:Lasers; D011878:Radiotherapy / Q000295:instrumentation* / Q000379:methods*; D017356:Synchrotrons
chemical_list: D002244:Carbon