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RISS 인기검색어
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- 저자 : Nobuo Ouchi (검색결과 4 건)
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J-PARC Linac Facilities and their Features
Nobuo Ouchi 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.48 No.4
The Japan Proton Accelerator Complex (J-PARC), which consists of a 600-MeV linac, a 3-GeV rapid cycling synchrotron, a 50-GeV synchrotron and experimental facilities, is not only one of the most powerful proton accelerators in the world but also a multipurpose accelerator for neutron science, muon science, nuclear and elementary particle physics, and nuclear engineering. The linac building and its conventional facilities were designed and constructed carefully in consideration of stable operation and further upgrade. The linac building, which has two stories above ground and two stories below ground, was completed in April, 2005. The conventional facilities were also completed in August 2005. The installation of the accelerator began in April 2005. The ion source, the radio-frequency quadrupole linac (RFQ), the drift tube linac (DTL) tanks, the medium energy beam transport between the RFQ and the DTL (MEBT1), and the beam transport to the 3-GeV synchrotron have already been installed. Installation of the separated-type drift tube linac (SDTL) tanks and the RF system are being continued. This paper describes the J-PARC linac facilities and their features in terms of the building and conventional facilities, as well as the present status of the linac installation.
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Nobuo Ouchi 한국물리학회 2010 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.56 No.61
The Japan Proton Accelerator Research Complex (J-PARC) is in phase-I now. The complex consists of three accelerators a linac, a 3-GeV rapid cycling synchrotron (RCS), and a 50-GeV main ring synchrotron (MR), and three experimental facilities the Materials and Life Science Experimental Facility (MLF), the Hadron Experimental Facility, and the Neutrino Experimental Facility. After the beam commissioning of the RCS, the first beam injection, circulation, and acceleration to 30 GeV in the MR, and the first neutron and muon generation in the MLF were successfully performed in 2008. User operation of the MLF was also started in December 2008. In addition,high-beam-power demonstrations were performed at the RCS 322-kW equivalent power in single shot operation. In 2009, the first beams were injected from the MR to both the Hadron Experimental Facility and the Neutrino Experimental Facility. Therefore, proton beams have now reached all experimental facilities. Recent progress at J-PARC in 2008 and 2009 will be presented.
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Nobuo Ouchi 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.52 No.3
The Japan Proton Accelerator Research Complex (J-PARC) is not only one of the most powerful proton accelerators in the world but also a multipurpose accelerator for neutron science, muon science, nuclear and particle physics, and nuclear engineering. Since 2001, it has been in its first constructing phase, which consists of three accelerators, i.e., the Linac, the 3-GeV rapid cycling synchrotron (RCS), and the 50-GeV main ring synchrotron (MR), and three experimental facilities, i.e., the Materials and Life Science Experimental Facility (MLF), the Hadron Experimental Facility, and the Neutrino Experimental Facility. The construction and the commissioning of the J-PARC are in progress and are almost on schedule. A beam commissioning of the Linac was performed successfully, and it is ready for beam injection to the RCS now. The installation and the off-beam commissioning of the RCS have been completed and the beam commissioning will start in October, 2007. In the MR, the MLF, and the Hadron Experimental Facilities, installation of equipments is in progress towards beam commissioning in 2008. In the Neutrino Experimental Facility, civil construction is going on towards beam commissioning in 2009. This paper provides the present status and near-future plan for the construction and commissioning of various components in the J-PARC project. The Japan Proton Accelerator Research Complex (J-PARC) is not only one of the most powerful proton accelerators in the world but also a multipurpose accelerator for neutron science, muon science, nuclear and particle physics, and nuclear engineering. Since 2001, it has been in its first constructing phase, which consists of three accelerators, i.e., the Linac, the 3-GeV rapid cycling synchrotron (RCS), and the 50-GeV main ring synchrotron (MR), and three experimental facilities, i.e., the Materials and Life Science Experimental Facility (MLF), the Hadron Experimental Facility, and the Neutrino Experimental Facility. The construction and the commissioning of the J-PARC are in progress and are almost on schedule. A beam commissioning of the Linac was performed successfully, and it is ready for beam injection to the RCS now. The installation and the off-beam commissioning of the RCS have been completed and the beam commissioning will start in October, 2007. In the MR, the MLF, and the Hadron Experimental Facilities, installation of equipments is in progress towards beam commissioning in 2008. In the Neutrino Experimental Facility, civil construction is going on towards beam commissioning in 2009. This paper provides the present status and near-future plan for the construction and commissioning of various components in the J-PARC project.
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Design and Delivery of Beam Monitors for the Energy-upgraded Linac in J-PARC
Akihiko Miura,Nobuo Ouchi,Hidetomo Oguri,Kazuo Hasegawa,Tomoaki Miyao,Masanori Ikegami 한국물리학회 2015 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.66 No.3
In the J-PARC (Japan Proton Accelerator Research Complex) linac, an energy-upgrade projecthas started to achieve a design beam power of 1 MW at the exit of the downstream synchrotron. To account for the significant beam parameter upgrades, we will use the newly-fabricated beammonitors for the beam commissioning. This paper discusses the design and assembly of the beamposition monitor, phase monitor, current monitor, transverse profile monitor, and beam loss monitorfor the energy-upgraded linac. We periodically installed the newly-fabricated monitors for theupgraded beam line, as well as for longitudinal matching, because of the frequency jump betweenthe original RF cavity and the newly-developed cavity. We employed two debunchers to correctfor momentum spread and jitter. To account for the new debunchers, we fabricated and installedadditional pairs of phase monitors in order to tune the debunchers to the adequate RF set point. Finally, we propose commissioning plans to support the beam monitor check. We will begin toestablish the 181-MeV operation to confirm the proper functioning of beam monitors. Herein, wewill examine the response to changes of the knobs that control the quadrupole magnets after theenergy upgrade. After proper functioning of the beam monitors is confirmed, we will use the newbeam monitors to establish the 400-MeV acceleration operation.
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