• Y. Hashimoto, T. Toyama
  J-PARC, KEK & JAEA, Ibaraki-ken
• T. Fujisawa
  AEC, Chiba
• T. Morimoto
  Morimoto Engineering, Iruma, Saitama
• T.M. Murakami, K. Noda
  NIRS, Chiba-shi
• S. Muto
  KEK, Ibaraki
• D. Ohsawa
  Kyoto University, Radioisotope Research Center, Kyoto-shi

A non­de­struc­tive beam pro­file mon­i­tor using a ni­tro­gen-molecule gas-jet sheet has been de­vel­oped for in­tense ion beams. The den­si­ty of the gas-jet sheet cor­re­sponds to 1 x 10^-3 Pa. A light emit­ted from ni­tro­gen ex­cit­ed by an ion beam col­li­sion is mea­sured with a high sen­si­tive cam­era at­tached a ra­di­a­tion hard image in­ten­si­fi­er. In tests, beam pro­files of 6 MeV/u full-stripped oxy­gen beams whose peak cur­rent was 600 μA. were mea­sured. This paper de­scribes char­ac­ter­is­tics of the in­stru­ments and the beam test re­sults.

• K. Noda, S. Fukuda, T. Furukawa, T. Himukai, T. Inaniwa, Y. Iwata, N. Kanematsu, K. Katagiri, A. Kitagawa, S. Minohara, S. Mori, T.M. Murakami, M. Muramatsu, S. Sato, T. Shirai, E. Takada, Y. Takei, E. Takeshita
  NIRS, Chiba-shi
• T. Fujimoto, Y. Sano
  AEC, Chiba

Based on more than ten years of ex­pe­ri­ence of the car­bon can­cer ther­a­py with HIMAC, we have pro­posed a new treat­ment fa­cil­i­ty for the fur­ther de­vel­op­ment of the ther­a­py with HIMAC. This fa­cil­i­ty will con­sist of three treat­ment rooms: two rooms equipped with hor­i­zon­tal and ver­ti­cal beam-de­liv­ery sys­tems and one room with a ro­tat­ing gantry. For the beam-de­liv­ery sys­tem of the new treat­ment fa­cil­i­ty, a 3D hy­brid raster-scan­ning method with gated ir­ra­di­a­tion with pa­tient's res­pi­ra­tion has been pro­posed. A R&D study has been car­ried out to­ward the prac­ti­cal use of the pro­posed method. In the R&D study, we have im­proved the beam con­trol of the size, the po­si­tion and the time struc­ture for the pro­posed scan­ning method with the ir­ra­di­a­tion gated with pa­tient's res­pi­ra­tion. Fur­ther, owing to the in­ten­si­ty up­grade of the HIMAC syn­chrotron, we can suc­cess­ful­ly ex­tend the flat­top du­ra­tion, which can com­plete one frac­tion­al ir­ra­di­a­tion with one op­er­a­tion pe­ri­od. The build­ing con­struc­tion of the new treat­ment fa­cil­i­ty will be com­plet­ed at March 2010 and treat­ment of 1st pa­tient is sched­uled at March 2011. We will re­port the re­cent progress on the new treat­ment fa­cil­i­ty pro­ject at HIMAC.

Slides