| Paper |
Title |
Page |
| TUPAN043 |
RF Amplitude and Phase Tuning of J-PARC DTL
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1481 |
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- M. Ikegami
- H. Asano, T. Kobayashi
JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken
- K. Hasegawa, T. Ito, T. Morishita, S. Sato, A. Ueno
JAEA/LINAC, Ibaraki-ken
- Z. Igarashi, H. Tanaka
KEK, Ibaraki
- H. Sako
JAEA, Ibaraki-ken
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The beam commissioning of J-PARC linac has been started in November 2006. In the beam commissioning, the tuning of the RF phase and amplitude for its DTL (Drift Tube Linac) has been performed with a phase-scan method. Detailed results of the RF tuning are presented with a brief discription of the tuning procedure.
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| MOPAN029 |
XAL Online Model Enhancements for J-PARC Commissioning and Operation
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218 |
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- C. K. Allen
- H. Ikeda
Visual Information Center, Inc., Ibaraki-ken
- M. Ikegami
KEK, Ibaraki
- T. Ohkawa
JAEA, Ibaraki-ken
- H. Sako, G. B. Shen
JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken
- A. Ueno
JAEA/LINAC, Ibaraki-ken
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Funding: Work supported by a KEK foreign visiting researcher grant
The XAL application development environment has been installed as a part of the control system for the Japan Proton Accelerator Research Center (J-PARC). XAL was initially developed at SNS and has been described at length in previous conference proceedings (e.g., Chu et. al. APAC07, Galambos et. al. PAC05, etc.). The fundamental tenet of XAL is to provide a consistent, high-level programming interface, along with a set of high-level application tools, all of which are independent of the underlying machine hardware. Control applications can be built that run at any accelerator site where XAL is installed. Of course each site typically has specific needs not supported by XAL and the framework was designed with this in mind: each institution can upgrade XAL which then is accessible to all users. We outline the upgrades and enhancements to the XAL online model necessary for accurate simulation of the J-PARC linac. For example, we have added permanent magnet quadrupoles and additional space charge capabilities such as off-centered and rotated beams and bending magnets with space charge. We present the physics models for the upgrades as well as the software architecture supporting them.
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| TUPAN059 |
The Precise Survey and the Alignment Results of the J-PARC Linac
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1520 |
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- T. Morishita
- H. Asano, M. Ikegami
JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken
- K. Hasegawa
JAEA, Ibaraki-ken
- A. Ueno
JAEA/LINAC, Ibaraki-ken
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J-PARC linear accelerator components have been installed and the beam commissioning has been started in Nov. 2006. A total length is more than 400 m including the beam transport line to the 3GeV RCS(Rapid Cycling Synchrotron). Precise alignment of the accelerator components is essential for high quality beam acceleration. After the completion of the linac building, floor elevation was surveyed periodically for more than one year to adjust the beam height from the ion source to the RCS. Before the beam commissioning, a metrological survey has been done. The reference points on the tunnel wall were set up to form a survey network to reduce the survey error less than 1mm in the entire linac. Based on the survey results, the linac components were re-aligned finely to satisfy the requirement. In this paper, the results of the floor elevation and the final alignment are described.
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| TUPAN060 |
The DTL/SDTL Alignment of the J-PARC Linac
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1523 |
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- T. Morishita
- H. Asano, M. Ikegami, T. Ito
JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken
- K. Hasegawa
JAEA, Ibaraki-ken
- F. Naito, E. Takasaki, H. Tanaka, K. Yoshino
KEK, Ibaraki
- A. Ueno
JAEA/LINAC, Ibaraki-ken
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J-PARC linear accelerator components have been installed and the beam commissioning has been started in Nov. 2006. The length of the linear section is about 300 m which consists of the ion source, the radio frequency quadropole linac(RFQ), the drift tube linac(DTL), separated type DTL(SDTL), and the beam transport line. Precise alignment of the accelerator components is essential for high quality beam acceleration. The required alignment error in the J-PARC linac is 0.1mm in transverse direction. In the DTL/SDTL section, the fine alignment was carried out by using an optical alignment telescope along with the cavity installation. The relay targets were placed at short intervals for smooth connection between neighboring components. After the installation, the DTL/SDTL positions were confirmed by measuring the reference base by using a laser tracker. In this paper, the alignment procedure for the DTL/SDTL section and the results by the laser tracker measurements are described.
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| TUPAN039 |
Profile Measurement and Transverse Matching in J-PARC Linac
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1472 |
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- H. Akikawa
- Z. Igarashi, M. Ikegami, S. Lee
KEK, Ibaraki
- S. Sato, T. Tomisawa, A. Ueno
JAEA/LINAC, Ibaraki-ken
- G. B. Shen
JAEA, Ibaraki-ken
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Beam commissioning of J-PARC linac has been performed since November 2006. In the beam commissioning, transverse matching has been performed by measurement of beam profiles and emittance with wire scanners. In this presentation, detail of wire scanners and the method of matching are described.
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| TUPAN056 |
Fabrication Status of ACS Accelerating Modules of J-PARC Linac
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1514 |
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- H. Ao
- K. Hasegawa
JAEA, Ibaraki-ken
- K. Hirano, T. Morishita, A. Ueno
JAEA/LINAC, Ibaraki-ken
- M. Ikegami
KEK, Ibaraki
- V. V. Paramonov
RAS/INR, Moscow
- Y. Yamazaki
KEK/JAEA, Ibaraki-Ken
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An ACS (Annular Coupled Structure) cavity has been developed for the J-PARC Linac from 190-MeV to 400-MeV. We fabricated a buncher module with two 5-cell accelerating tanks and one 5-cell bridge tank as the first module. The buncher module is shorter than accelerating module that consists of two 17-cell accelerating tanks and one 9-cell bridge tank. The first buncher module achieved the stable operation of 50 Hz, 600 us, 600 kW in the high-power test, which corresponds to the E0 value of 4.8 MV/m. The second buncher module and three accelerating modules are under fabrication continuously. These results of the frequency tuning and assembling are presented in detail.
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| WEOCC01 |
Experimental Approach to Ultra-Cold Ion Beam at S-LSR
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2035 |
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- A. Noda
- H. Fadil, M. Grieser
MPI-K, Heidelberg
- M. Ikegami, T. Ishikawa, M. Nakao, T. Shirai, H. Souda, M. Tanabe, H. Tongu
Kyoto ICR, Uji, Kyoto
- I. N. Meshkov, A. V. Smirnov
JINR, Dubna, Moscow Region
- K. Noda
NIRS, Chiba-shi
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Funding: The present work was supported from Advanced Compact Accelerator project by MEXT, Japan. Support from the 21COE at Kyoto University-Diversity and Universality in Physics- is also greatly appreciated.
S-LSR is a storage and cooler ring with the circumference of 22.56 m applied for an electron beam cooling of 7 MeV proton beam and laser cooling of 24Mg+ beam with 35 keV. From the measurement with the use of Schottky pich-up of the momentum spread of 7 MeV proton beam reducing the particle number to suppress the effect of intra-beam scattering,abrupt jump in fractional momentum spread and Schottky power has been observed, which is considered the 1 dimensional phase transition to the ordered state*. The situation has also been expected from numerical simulation**. Laser cooling with much stronger cooling force is expected to realize 2Dand 3D crystalline states if the maintenance condition can be satisfied. Experimental approaches to realize such a condition at S-LSR as dispersion free lattice and "tapered cooling" are also decribed in the present paper.
* A Noda, et al., , New Journal of Physics, 8 (2006)288.** A. Smirnov et al., Beam Science and Technology, 10 (2006) 6*** J. Wei, X-P, Li and A. M. Sessler, , Phys. Rev. Lett. 73 (1994) 3089.
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Slides
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| FRPMN045 |
Beam Position Monitor and its Calibration in J-PARC LINAC
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4072 |
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- S. Sato
- H. Akikawa, Z. Igarashi, N. Kamikubota, S. Lee
KEK, Ibaraki
- M. Ikegami
JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken
- H. Sako, G. B. Shen
JAEA, Ibaraki-ken
- T. Tomisawa, A. Ueno
JAEA/LINAC, Ibaraki-ken
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The beam commissioning of J-PARC linac has been started in November 2006. Beam Position Monitors (BPMs) which have been calibrated on the bench setup with a scanning wire, utilize beam based calibration to relate the BPM center and the center of Q magnet. In this presentation, detail of installed BPM and the calibration methods are described.
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| THPAN043 |
Comparison of Trajectory Between Modeling and Experiment for J-PARC Linac
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3324 |
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- T. Ohkawa
- H. Ao, A. Ueno
JAEA/LINAC, Ibaraki-ken
- K. Hasegawa
JAEA, Ibaraki-ken
- M. Ikegami
KEK, Ibaraki
- H. Sako
JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken
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In the beam commissioning of J-PARC (Japan Proton Accelerator Research Complex) linac, three simulations codes are used to model the accelerator. We have compared with the experimental results obtained in the beam commissioning to date, where a basic agreement has been confirmed between the modeling and the actual beam behavior.
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