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| MOPA07 | Progress on the Upgrade for TRT at NIRS Cyclotron Facility | 48 |
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| The cyclotron facility at National Institute of Radiological Science (NIRS) includes two cyclotrons, a NIRS-930 cyclotron (Thomson-CSF, Kb=110 MeV and Kf=90 MeV) and a small cyclotron HM-18 (Sumitomo-Heavy-Industry). The NIRS-930 cyclotron has been used for radionuclide production, nuclear physics, detector development and so on, since the first beam in 1973. The HM-18 has been used for radionuclide production for PET since the 1994. In recent years, the radionuclide production for Targeted Radionuclide Therapy (TRT) by using NIRS-930 has been one of the most important activities in NIRS. Since demand of radionuclide users on beam intensity is growing, we have launched to upgrade the cyclotron facility, such as installation of multi-harmonic beam buncher in NIRS-930 and a reinforcement of nuclear ventilation system in a cave. Progress on the upgrade for TRT at the cyclotron facility and status of the NIRS cyclotrons are to be presented in this report. | ||
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| MOPA08 | The Multi Particle Simulation for the Cyclotron NIRS-930 | 51 |
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The simulation of the beam for the cyclotron NIRS-930 at NIRS has been performed with the use of the SNOP program* in order to study beam dynamics in a cyclotron and to improve beam intensity. SNOP simulated from beam injection to extraction with the electric fields of the inflector, the Dee electrodes and the deflector; the magnetic fields of the main coils, the trim coils and the harmonic coils and the magnetic channel which were calculated by OPERA-3d. The simulation of proton with 30 MeV extraction energy with harmonic number of 1 was already performed and well simulated RF phase and extraction efficiency**. Then we tried to apply SNOP to 18 MeV protons with harmonic 2. We first formed isochronous magnetic field with main and trim coils for simulating single particle. Next we optimized electric deflector and magnetic channel in order to maximize extraction efficiency simulating the bunch of particles. Beam loss of the simulation was compared to the experiment. We intend to apply optimized simulation parameters for actual cyclotron operation to improve beam intensity and quality.
* V.L. Smirnov, S.B. Vorozhtsov, Proc. of RUPAC2012 TUPPB008 325 (2012) ** V.L. Smirnov et al., Proc. of IPAC2012 292 (2012) |
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| WEPB03 | Acceleration Scheme of Radioactive Ion Beam with HIMAC and its Injector Linac | 197 |
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For the purpose of simultaneous real-time observation of irradiation effects in the patients body during a heavy ion cancer treatment, the capability of acceleration of radioactive ion beam such as 11C has been investigated where an ISOL based ion source combined with a cyclotron was assumed. According to recent development of a single charged 11C ion source and its charge breeder*, it becomes to be important to estimate the intensities attainable by acceleration of such radioactive beam with the use of HIMAC and its injector quantitatively taking the beam dynamics into account. In the present paper, phase space matching of the secondary produced radioactive 11C ion beam is investigated among the ion source, injector linac and HIMAC synchrotron, referring to the ISOLDE system at CERN.
*: K. Katagiri et al., Contribution to this Sympojium. |
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FRM1C02 |
Research and Developments Toward Radioactive C-11 Ion Acceleration | |
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Funding: This study was partially supported by a JSPS KAKENHI Grant Number 25790090. An isotope Separation On-Line (ISOL) system for radioactive C-11 ion beam acceleration is expected to be realized for a PET imaging simultaneously with the heavy-ion cancer therapy. In the ISOL scheme, C-11 molecules are firstly produced by irradiating boron compound target with proton beams (20 MeV, ~30 μA) provided by a small cyclotron. The C-11 molecules are separated from impurity molecules mixed into the target chamber during the proton irradiation. Then, 1+ ions are firstly produced from the purified C-11 molecules with the singly charged ion source. Finally, after the isotope separation with an analyzing magnet, the C+ ions are further ionized by employing an EBIS as a charge breeder to obtain required charge state for the HIMAC injector.* We have been developed a C-11 molecular production/separation system to produce the C-11 molecules and separate it from the impurities. We have also been developed a new singly charged ion source to produce the 1+ ions. Moreover, a test irradiation port is being constructed at NIRS cyclotron facility for on-line experiments to produce C-11 ions. Latest results on those developments and prospects of our ISOL scheme are to be presented. *Akira Noda, et al., in these proceedings. |
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