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Development of a control system for stable linac operation
https://ir.soken.ac.jp/records/638
https://ir.soken.ac.jp/records/638097ab556-d345-4a8c-8993-0f0997d96522
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要旨・審査要旨 (356.9 kB)
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本文 (9.1 MB)
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| Item type | 学位論文 / Thesis or Dissertation(1) | |||||
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| 公開日 | 2010-02-22 | |||||
| タイトル | ||||||
| タイトル | Development of a control system for stable linac operation | |||||
| タイトル | ||||||
| タイトル | Development of a control system for stable linac operation | |||||
| 言語 | en | |||||
| 言語 | ||||||
| 言語 | eng | |||||
| 資源タイプ | ||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_46ec | |||||
| 資源タイプ | thesis | |||||
| 著者名 |
増田, 剛正
× 増田, 剛正 |
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| フリガナ |
マスダ, タケマサ
× マスダ, タケマサ |
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| 著者 |
MASUDA, Takemasa
× MASUDA, Takemasa |
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| 学位授与機関 | ||||||
| 学位授与機関名 | 総合研究大学院大学 | |||||
| 学位名 | ||||||
| 学位名 | 博士（工学） | |||||
| 学位記番号 | ||||||
| 内容記述タイプ | Other | |||||
| 内容記述 | 総研大乙第157号 | |||||
| 研究科 | ||||||
| 値 | 高エネルギー加速器科学研究科 | |||||
| 専攻 | ||||||
| 値 | 12 加速器科学専攻 | |||||
| 学位授与年月日 | ||||||
| 学位授与年月日 | 2006-03-24 | |||||
| 学位授与年度 | ||||||
| 値 | 2005 | |||||
| 要旨 | ||||||
| 内容記述タイプ | Other | |||||
| 内容記述 | The SPring-8 linac has to serve high stability of electron beams for a long period of a few months. It is because the linac is used for simultaneous top-up operation of the SPring-8 8-GeV storage ring and the 1.5- GeV NewSUBARU storage ring. Injections into NewSUBARU are very sensitive to variations of beam energy and beam trajectory. Effective tolerance of energy variations to keep high injection efficiency into NewSUBARU is presently 0.03% (rms). In order to achieve long-term stability of the linac electron beams, shot-by-shot data acquisition of non-destructive beam position monitors (BPMs) is required for investigation of beam instabilities and feedback control of the electron beams. <br /> The old linac control system was built on the bases of standard technologies such as VMEbus, Ethernet, and UNIX computers. It had to be a base of the development of the BPM data acquisition system. Nevertheless, the old system didn’t have enough control capability such as data logging system, high throughput of issued commands and so on. And the old system also couldn’t provide enough stability to realize the long-term simultaneous top-up operations in both hardware and software. <br /> As the groundwork for the stable linac operation and the shot-by-shot data acquisition, the new linac control system was designed and developed taking account of stability enhancement of the control system itself and availability enhancement of the linac operation. The system was developed through the extensive studies of modern operating system (OS), up-to-date electric circuit technologies using field-programmable gate array (FPGA), real-time control capabilities and so on. For the control software, MADOCA (Message And Database Oriented Control Architecture) was adopted. The MADOCA framework, which had been already used in the SPring-8 accelerator complex, provided satisfactory stability and powerful data logging system. Solaris was newly chosen as the real-time OS for Intel architecture VME CPU boards, according to the results of wide and profound studies of real-time functionality. The MADOCA framework was installed to the Solaris-operated modern VME CPU boards together with migrated driver software and device control application programs. The control hardware was radically renovated. Optical-linked remote I/O system (OPT-VME) and network-connectable pulse-motor control unit (MCU) were newly developed instead of direct I/O boards on the VMEbus. The new devices could keep the VME computers away from big noise sources, and could maintain the output signals even if the VME computers were rebooted. And the new devices could provide function-intensive control capability to the new control system. <br /> As the result of the renovation, the new linac control system successfully brought high stability, high throughput and powerful data logging system. And the new control system never interrupted the SPring-8 simultaneous top-up operation in 2005 by its troubles, resulting in success of availability enhancement of the linac operation. <br /> On the base of the new linac control system, the development of a shot-by-shot BPM data acquisition system came feasible. The new data acquisition system for the 47 BPMs in the linac was developed to acquire all the 376 BPM data synchronizing to every beam shot. A set of synchronized BPM data was taken by six VME systems and a shared memory network. All the acquired dataset was stored into a general relational database (RDB). The data was recorded together with an event number and a time stamp for beam shot identification. The system successfully realized data acquisition with no detection losses at the 60pps linac operation using interrupt-based event detection, real-time feature of the Solaris, faster VME CPU boards and so on. The system was also designed to have real-time controllability to apply to fast feedback control in the future. <br /> The archived BPM data in the RDB are utilized for automatic trajectories and energies corrections of the electron beams in every 5 minutes. The BPM data analysis successfully contributes to the achievement of long-term energy stability of 0.02% (rms) and beam positions stability of 30μm (rms) through the automatic feedback control. <br /> The long-accumulated BPM data taken by the new system reproduces a past electron beam status. The analysis of the burst currents occurred in the linac was a good example to show the importance of the completeness of BPM dataset. An investigation of recorded BPM data brought a fruitful result to find a rare burst-current phenomenon. It was achieved by surveying a perfect dataset taken by the event-synchronized data acquisition system. <br /><br /> This study produces successful results in the development of the new linac control system and the new shot-by-shot BPM data acquisition system. The new control system greatly contributed to enhancement of the linac stability and the electron beam quality. In particular, the beam-synchronized data acquisition and the analysis of all the acquired data was effective approach for the linac stabilization. The new framework, furthermore, can be applied to 60Hz data acquisition of SCSS (SPring-8 Compact SASE Source), which is a coming 8-GeV X-ray free electron laser accelerator with C-band accelerating structures. The application will help the beam stabilization of the SCSS a lot. | |||||
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| 値 | 有 | |||||
