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Publications (18)6.23 Total impact

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    ABSTRACT: Since the 3GeV Rapid Cycling Synchrotron (RCS) produces huge beam power of 1 MW, extreme cares must be taken to design the control system in order to minimize radiation due to beam loss. Another complexity appears in the control system, because each beam bunch of 25 Hz is required to be injected either into the Material and Life Science Facility (MLF) or into the 50GeV Main Ring (MR). Therefore, each bunch of 25 Hz must be operated with different parameters, and the data acquisition system also must collect synchronized data within each pulse. To achieve these goals, a control system via reflective memory and wave endless recorders have been developed. EPICS is adopted in the control system. Since the number of devices is huge, the management of EPICS records and their configurations need huge amount of time and man power. To reduce this work significantly, a Relational Data Base (RDB) for static machine information has been developed. This RDB stores (1) EPICS related information of devices, interfaces, and Input Output Controller (IOC) with a capability to generate EPICS records automatically, and (2) geometrical information of components with a capability to generate lattice files for various simulation codes. The status of the RCS control system focusing on the data acquisition system and the RDB will be presented.
    Particle Accelerator Conference, 2005. PAC 2005. Proceedings of the; 06/2005
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    ABSTRACT: The J-PARC[1] is consisted of 400MeV LINAC(LI), 3GeV Rapid Cycling Synchrotron(RCS), and 50GeV Main Ring synchrotron(MR). The high intensity beam, peak cur-rent 50mA and pulse widths 500µ seconds, is produced from the LI. The beam power reaches 1MW in the RCS, and 0.75MW in the MR. Therefore, the huge nuclear ra-diation is emitted, when such a beam deviates from the ideal orbit and loses it all. For that purpose, we design the control system based on the ALARA(As Low As Reasonably Achievable; principle on radiological protection) principle, using the EPICS(Experimental Physics and Industrial Control System) toolkits. In this paper, a part of the method for the ALARA in the J-PARC control system is presented.
    01/2004;
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    ABSTRACT: A bacterial artificial chromosome (BAC) library consisting of 49,152 genomic clones was constructed from partially HindIII-digested female chicken embryo genomic DNA using the pBAC-Lac vector and maintained in 512 96-well plates. The mean insert size was approximately 150 kb, and the total library was estimated to contain about 3.2 times coverage of the diploid genome. In order to screen this library by the PCR, 296 BAC clone DNA samples were prepared: one sample each from 8 superpools (64 plates per superpool) and 36 samples of four-dimensionally (4-D) mixed clones from each superpool. A BAC clone of interest was selected by two-step PCR. First, 8 DNA samples representing superpools were subjected to PCR with a set of primers to amplify a part of the genomic sequence of interest. Second, 36 4-D DNA samples from the superpool that contained BAC clone(s) of interest were subjected to PCR with the same set of primers. The second step identified a plate and a well containing the BAC clone of interest. Selection of target BAC clone(s) from the whole library with the above procedure can be achieved within 1 to 4 d without using a radioactive probe. This procedure was applied successfully in the selection of BAC clones for Wpkci, chPKCI/HINT, ZOV3, and 17beta-HSD genes.
    Poultry Science 11/2002; 81(10):1501-8. · 1.52 Impact Factor
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    ABSTRACT: At the present software technic, the methodology of Object Oriented Programming(OOP) has become the mainstream. Because it will be gave the efficient development of programming and the easy maintenance. OOP makes many parts of program that called Object, and these Objects are assembled into main program. When many Objects are reserved on the system development, so that the future development will be easy by using stored Objects. On the accelerator, we consider the system as assembled parts. And it will always be improved or replaced. So OOP is suitable for the accelerator system [1], then we try for using OOP. First of all, all component of SPring-8 Linac were abstracted and modeled, and we designed a Super Class which is core of Object. In this paper, the concept of our system and its present status are described. I. STRUCTURE OF CONTROL SYSTEM For the data acquisition and low level control of devices, we adopt the VME system. The hierarchy of control system have two layers. One is C...
    04/1998;
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    ABSTRACT: At present, the methodology of Object Oriented Programming (OOP) has become the mainstream. Because it will be gave the efficient development of programming and the easy maintenance. OOP makes many parts of program that called Object, and these Objects are assembled into main program. When many Objects are reserved on the system development, so that the future development will be easy by using stored Objects. On the accelerator, we consider the system as assembled parts. And it will always be improved or replaced. So OOP is suitable for the accelerator system, then we try for using OOP. First of all, all component of SPring-8 Linac were abstracted and modeled, and we designed a Super Class which is core of Object. In this paper, the concept of our system and its present status are described
    Particle Accelerator Conference, 1995., Proceedings of the 1995; 06/1995
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    ABSTRACT: A 256 Mb memory can store 171s of NTSC video data using the MPEG1 method. The application-oriented 256 Mb CMOS DRAM reported here is suitable for the storage of moving pictures, with low power (73 mA at 100 MHz), refresh-free-FIFO function, and 16b serial I/O ports. The chip has: (1) suppressed high-level differential transfer, (2) lower voltage level pre-charge, (3) divided operation of array circuits for serial access, and (4) self refresh during a serial read/write
    Solid-State Circuits Conference, 1994. Digest of Technical Papers. 41st ISSCC., 1994 IEEE International; 03/1994
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    ABSTRACT: The first section of the Injector Linac for SPring-8 has been constructed and the initial beam meets the specification. This section, from the electron gun to the buncher and monitors, is also used as a test stand for the control software. The concept of Object-Oriented programming was adopted because of the special requirements for the accelerator control. We present an overview of the linac control system and the software architecture.
    Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment - NUCL INSTRUM METH PHYS RES A. 01/1994; 352:216-217.
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    ABSTRACT: A 256-Mb DRAM with refresh-free-FIFO function for storage of moving pictures has been developed using 0.25-μm CMOS technology. An operating current of 73 mA (reduction of 52% compared with a conventional circuit) has been achieved at 100 MHz based on introducing (1) a suppressed High(H)-level differential data transfer scheme which ran be operated at 0.6 V, (2) a new pre-charge method which features a 1/2 VCC precharge level in read cycle and VSS pre-charge level in write cycle, and (3) a divided operation of array circuits for serial access
    IEEE Journal of Solid-State Circuits 01/1994; 29(11):1310-1316. · 3.06 Impact Factor
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    ABSTRACT: A temperature-sensitive growth mutant tsFS20 isolated from mouse FM3A cells was identified as a mutant with thermolabile ubiquitin-activating enzyme E1 by transfection with a full-length cDNA encoding the human E1 enzyme and cell-cell hybridization with an authentic E1 mutant ts85 previously isolated from FM3A cells. The resulting transformants produced thermoresistant E1 activity. Upon shift-up of temperature, asynchronously growing tsFS20 cells showed multiple points of cell-cycle arrest. At the nonpermissive temperature, tsFS20 cells that had been synchronized at the G1-S-phase progressed and accumulated in the mid-S-phase, as evidenced by the absence of G2-specific cdc2 kinase activity, while ts85 mutant cells, the widely used E1 mutant, reached the G2-phase and were arrested. Thus, the E1 mutation seemed to be involved in progression in the S-phase as well as in the G2-phase in the cell cycle. Degradation of short-lived abnormal proteins in tsFS20 cells was decreased to about 50% at the nonpermissive temperature, while the block was fully restored to the wild-type level in the transformant cells. Relevance of the unusually high incidence of the temperature-sensitive E1 mutation was discussed in terms of the E1 as a determinant of heat tolerance of cells.
    Cell Structure and Function 05/1992; 17(2):113-22. · 1.65 Impact Factor
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    ABSTRACT: The human gene for ubiquitin-activating enzyme E1 (UBE1) was localized by a direct mapping system that combined fluorescence in situ hybridization with replicated R-bands on prometaphase chromosomes. The fluorescent signals were localized to Xp11.3----p11.23. Simple procedures for the detection of R-bands are also described.
    Cytogenetics and cell genetics 02/1992; 59(4):268-9.
  • Y. Itoh, S. Asakawa
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    ABSTRACT: An oxygen enriched gas supply arrangement for combustion which is so arranged that, by supplying air to a selective air permeating membrane cell, the flow rate and/or oxygen concentration of the oxygen enriched gas passing through the selective gas permeating membrane cell are controlled to predetermined conditions required for the combustion. The arrangement further includes devices for maintaining the humidity in the oxygen enriched gas thus obtained at a constant level and for removing pulsation therefrom, whereby a particularly suitable air supply source for various combustion equipment and apparatuses can be obtained.
    01/1985;
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    ABSTRACT: A Relational database (RDB) system, which records the control parameters and device online data in the J-PARC LINAC, has been developed. The beam commissioning of LINAC is planned to start in December 2006. The RDB system consists of the following databases; "DB1", which records basic device parameters, "DB2", which acquires online EPICS data, "Operation Log DB", which records a history of operating parameters, and "Commissioning/Simulation DB", which holds information on geometry of devices and commissioning. We report on the development status of each database as well as commissioning software environment tools which utilizes and relates these databases.
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    ABSTRACT: A bacterial artificial chromosome (BAC) li- brary consisting of 49,152 genomic clones was constructed from partially HindIII-digested female chicken embryo genomic DNA using the pBAC-Lac vector and main- tained in 512 96-well plates. The mean insert size was ∼150 kb, and the total library was estimated to contain about 3.2 times coverage of the diploid genome. In order to screen this library by the PCR, 296 BAC clone DNA samples were prepared: one sample each from 8 su- perpools (64 plates per superpool) and 36 samples of four- dimensionally (4-D) mixed clones from each superpool. A BAC clone of interest was selected by two-step PCR.
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    ABSTRACT: LINAC of J-PARC began to operate in November, 2006, and a achieved an initial performance in January, 2007. Afterwards, the beam supply to RCS begins, and it is operating extremely with stability up to now[1]. The fundamental condition of the control system design is to defend the beam loss detecting it as early as possible because it controls the radiation by the large strength beam to the minimum. This requirement influences from the level of the basic function of high-speed interlock to the level of an advanced application that needs the predictive control. It describes what work distribution, how much man power were necessary for the control system construction.
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    ABSTRACT: The linac that is SPring-8 injector was completed and started operation from August 1. A beam was able to be transported to the final beam dumping at a tail end on August 8. From now on this linac carries out beam adjustment and be scheduled to do a beam injection to a synchrotron in October.Å@The construction and fundamental performance of the linac are described.
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    ABSTRACT: As for an accelerator in today, a highly e-cient control system is demanded. The SPring-8 LINAC is also managed and operated with VME comput- ers and an EWS. The operator of LINAC search the best parameter for getting optimum performance on the electron beam. Once, one of the best parameter has found, they can save all parameters. And using it next time, they can reproduce the beam perfor- mance quickly. However, they waste long time doing parameter searching. Because, the relationship of each parameter is very complex. If automatic pa- rameter searching is able to do on the system, they can get a more comfortable operation and response. In this case, we designed the computer aided oper- ations using our control system. Firstly, we try to produce the automatic RF conditioning on the sys- tem. In this paper, the status of the system and the con- cept of computer aided machine operation are de- scribed.
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    ABSTRACT: For development of technologies and science utilizing a high intensity proton accelerator, JAERI and KEK are promoting a joint project "Japan Proton Accelerator Research Complex (J- PARC)". J-PARC consists of a linear accelerator (Linac), a 3GeV rapid-cycling synchrotoron (RCS), and a 50GeV synchrotoron (MR). Each accelerator transports high intensity beam to the experimental facilities, a materials and life science facility (MLF), a nuclear and particle physics facility, and an accelerator-driven transmutation experimental facility. Since the RCS is a proton synchrotron with an extreme high power of 1MW, a delicate care must be taken to suppress radiation due to beam loss. The RCS injects each beam pulse of 25 Hz into the MLF and the 50GeV MR in a predefined order. Since different beam control parameters are required for the MR and the MLF, monitoring and control must be made separately for each beam pulse, distinguishing the destination in the control system. In order to realize this demand, synchronicity of data is indispensable. There is beam position data etc. which requires synchronicity collection (fast synchronized data and slow synchronized data). To collect such data, we will build the system which uses Reflective Memory (RM), Wave Endless Recorder (WER) and so on. On the other hand, there is data (standard data) which requires only slow (1sec-) collection, such as the status of power supply. The slow data will be collected via a network. Therefore, RCS Data Acquisition (DAQ) system needs to collect simultaneously three kinds of data, fast synchronized data, slow synchronized data and standard data. And, RCS DAQ system is necessary to provide a user with these kinds of data which are matched.
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    ABSTRACT: J-PARC is a large scale facility of the proton accelerators for the multi-purpose of scientific researches in Japan. This facility consists of three accelerators and three experimental stations. Now, J-PARC is under construction, and LINAC is operated for one year, 3GeV synchrotron has just started the commissioning in this October the 1 st . The completion of this facility will be next summer. The control system of accelerators established fundamental performance for the initial commissioning of LINAC and RCS. The most important requirement to the control system of this facility is to minimize the activation of accelerator devices. In this paper, we show that the performances of each layer of this control system have been achieved in the initial stage.