| Paper |
Title |
Page |
| MPPE005 |
Dynamic Aperture and Resonance Correction for JPARC-RCS
|
979 |
| |
- A.Y. Molodojentsev, E. Forest, S. Machida
KEK, Ibaraki
- H. Hotchi, F. Noda, M.J. Shirakata, Y. Shobuda, H. Suzuki, K. Yamamoto
JAERI/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken
- Y. Ishi
Mitsubishi Electric Corp, Energy & Public Infrastructure Systems Center, Kobe
|
|
| |
Main intrinsic field nonlinearities, which are common for synchrotrons with large aperture, are the nonlinear field of the bending magnets, the fringing field of the magnets and the sextupole field nonlinearity, used for the chromaticity correction. The particle motion in the ring bending magnets has been analyzed by two methods: (1) by direct integration of the particle motion equations in the 3D magnetic field (Tosca output), based on the 4th order Runge-Kutta integrator and (2) by determination the transfer 8th order map of the bending magnet by using the Gaussian wavelet in the 3D space. The second technique allows us to use powerful tools such as the normal form analysis, to define the resonance driving terms, which can be used for the resonance correction. As the result of this study it was shown that the main limitation of the RCS dynamic aperture can be caused by the structure normal sextupole-order resonance and the normal octupole-order resonance. Other high-order resonances have smaller effects on the particles motion than the resonances mentioned above. The correction scheme to improve the dynamic aperture near the normal sextupole-order resonance has been analyzed.
|
|
| MPPE043 |
The Status of Optics Design and Beam Dynamics Study in J-PARC RCS
|
2759 |
| |
- F. Noda, N. Hayashi, H. Hotchi, J. Kishiro, P.K. Saha, Y. Shobuda, K. Yamamoto
JAERI/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken
- S. Machida, A.Y. Molodojentsev
KEK, Ibaraki
|
|
| |
The 3GeV RCS at J-PARC is designed to provide proton beam of 3GeV and a goal of output beam power is 1MW. The beam commissioning starts on May 2007. At present, more qualitative studies concerning beam dynamics are in progress: core beam handlings, halo beam handlings, instabilities and so on. In this paper, the RCS optics design and the present status of beam dynamics studies are summarized.
|
|
| MPPE081 |
The Comparison of a New Beam-Tracking Code to the Acceleration Test
|
4072 |
| |
- K. Yamamoto, S. Yamada, K. Yamamoto
NIRS, Chiba-shi
- T. Hattori
RLNR, Tokyo
- M. Okamura
RIKEN, Saitama
|
|
| |
A new beam-tracking code using a 3D electro-magnetic field map of a linac is being developed. In this code, beam dynamics including non-linear and dipole effects can be easily estimated based on simulated field maps provided by commercial 3D analysis software. To verify the code, we manufactured an IH-linac and acceleration test of the linac was carried out with proton beam. The simulated results were compared with the tested acceleration performances.
|
|
| MPPE081 |
The Comparison of a New Beam-Tracking Code to the Acceleration Test
|
4072 |
| |
- K. Yamamoto, S. Yamada, K. Yamamoto
NIRS, Chiba-shi
- T. Hattori
RLNR, Tokyo
- M. Okamura
RIKEN, Saitama
|
|
| |
A new beam-tracking code using a 3D electro-magnetic field map of a linac is being developed. In this code, beam dynamics including non-linear and dipole effects can be easily estimated based on simulated field maps provided by commercial 3D analysis software. To verify the code, we manufactured an IH-linac and acceleration test of the linac was carried out with proton beam. The simulated results were compared with the tested acceleration performances.
|
|
| WPAE012 |
Gamma-Ray Irradiation Experiments of Collimator Key Components for the 3GeV-RCS of J-PARC
|
1309 |
| |
- M. Kinsho, F. Masukawa, N. Ogiwara, O. Takeda, K. Yamamoto
JAERI/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken
- J. Kusano
Japan Atomic Energy Institute, Linac Laboratory, Tokai-Mura
|
|
| |
The turbo molecular pump and the stepping motor which can be operated exposed to high radiation has been under development at JAERI for use in the 3GeV-RCS of the J-PARC. In order to determine the extent of radiation damage to those instruments, gamma-ray irradiation testing was performed at JAERI. It was succeed that the turbo molecular pump and stepping motor could operate properly when given an absorption dose more than 15 MGy in a gamma-ray irradiation environment.
|
|
| WPAE013 |
Development of the Collimator System for the 3GEV Rapid Cycling Synchrotron
|
1365 |
| |
- K. Yamamoto
JAERI/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken
- M. Kinsho
Japan Atomic Energy Institute, Linac Laboratory, Tokai-Mura
|
|
| |
In order to localize the beam loss in the restricted area, the beam collimation system is prepared in the 3GeV Rapid Cycling Synchrotron (RCS) of the Japan Proton Accelerator Complex (J-PARC) Project. The amount of the localized beam loss on the one collimator is estimated about 1.2kW, and that loss generates a large quantity of the secondary radiations. So the beam collimator must be designed that it is covered with enough shielding. We calculated the radiation level of the collimator and decided necessary shielding thickness. This result indicated that the residual dose rate at the outside surface of the shielding is mostly under 1mSv/h. We developed the remote cramp system and rad-hard components in order to reduce the radiation exposure during maintenance of the collimator. And also we coated Titanium Nitride (TiN) film on the inside surface of the vacuum chamber in order to reduce the secondary electron emission from the collimator and chamber surface. Now we investigate the possibility of another coating.
|
|
| TPPE031 |
60 mA Carbon Beam Acceleration with DPIS
|
2206 |
| |
- M. Okamura, R.A. Jameson, K. Sakakibara, J. Takano
RIKEN, Saitama
- T. Fujimoto, S. Shibuya, T. Takeuchi
AEC, Chiba
- Y. Iwata, K. Yamamoto
NIRS, Chiba-shi
- H. Kashiwagi
JAERI/ARTC, Gunma-ken
- A. Schempp
IAP, Frankfurt-am-Main
|
|
| |
We have studied "direct plasma injection scheme (DPIS)" since 2000. This new scheme is for producing very intense heavy ions using a combination of an RFQ and a laser ion source. An induced laser plasma goes directly into the RFQ without an extraction electrode nor any focusing devices. Obtained maximum peak current of Carbon 4+ beam reached 60 mA with this extremely simple configuration. The details of the experimental result will be presented.
|
|
| RPAP007 |
Alternating-Phase-Focused Linac with Interdigital H-Mode Structure for Medical Injectors
|
1084 |
| |
- Y. Iwata, T. Fujisawa, T. Furukawa, S. H. Hojo, T. Honma, M. Kanazawa, N. M. Miyahara, T. Murakami, M. Muramatsu, K. Noda, H. Ogawa, M. Torikoshi, S. Yamada, K. Yamamoto
NIRS, Chiba-shi
- Y.F. Fujii, T. Mitsumoto, H. Tsutsui
SHI, Tokyo
- T. Fujimoto, H.O. Ogawa
AEC, Chiba
- V.V. Kapin
MEPhI, Moscow
|
|
| |
Tumor therapy using Heavy Ion Medical Accelerator in Chiba (HIMAC) has been performed at National Institute of Radiological Sciences (NIRS). With the successful clinical results over ten years, a project on developing compact accelerators has been started. To design these compact accelerators, a size of an injector as well as construction and operation costs plays an important role. To satisfy these requirements, we propose a compact injector consisting of a RFQ and Interdigital H-mode Drift-Tube-Linac (IH-DTL) having the resonant frequency of 200 MHz. The injector will accelerate carbon ion up to 4.0 AMeV. For the beam focusing of the IH-DTL, the method of Alternating-Phase-Focusing was employed. With the IH structure and rather high operating-frequency, the size of the cavities is compact; the radius is approximately 0.4 m, and the length of the RFQ and IH-DTL will be 2.5m and 3.5m respectively. The fabrication of the RFQ is in progress. For the IH-DTL, the full-scale model was fabricated. With the encouraging results of the electric field measurements, we are developing the final design of the IH-DTL. The fabrication of the entire injector will be completed at the end of 2005. The present status of our project will be shown.
|
|