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TUB003 |
Event-Synchronized Data-Acquisition System for SPring-8 XFEL
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69 |
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- M. Yamaga, Y. Furukawa, T. Hirono, M. I. Ishii, T. Masuda, T. Ohata, R. Tanaka, A. Yamashita
JASRI/SPring-8, Hyogo-ken
- T. Fukui, N. Hosoda
RIKEN/SPring-8, Hyogo
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We report the status and the upgrade of the event-synchronized data-acquisition system for the accelerator control of XFEL/SPring-8. Because the XFEL is composed of a linac, most of the equipment is driven with the pulsed operation. The stability of equipment is critically important to achieve/stabilize the FEL lasing. We need a fast data-acquisition system to take a set of data from RF signals and beam monitor signals synchronizing with the same electron beam shots. For this purpose, the event-synchronized data-acquisition system has been introduced to the control system of the SCSS test accelerator, an XFEL prototype machine. The system consists of a data filling computer, a relational data base server, VME-based shared memory boards and distributed shared memory network. So far total of 54 signals from the beam monitoring system are successfully collected synchronizing with the 60 Hz of beam operation cycles. The accumulated data was utilized for the fast feedback correction of beam trajectories and energy quite effectively. Signals from the RF systems will be taken by the upgraded data-acquisition system utilizing the distributed memory-cache system.
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WEP023 |
Correction of Phase and Amplitude Error of RF Modulator and Demodulator
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453 |
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- T. Ohshima, N. Hosoda, H. Maesaka, S. Matsubara, Y. Otake
RIKEN/SPring-8, Hyogo
- M. Yamaga
JASRI/SPring-8, Hyogo-ken
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The XFEL/SPring-8 project is in progress. SASE in X-ray region requires a high peak current of 3 kA, which will be achieved with an extremely stable rf accelerating field. In most severe case, the acceptable error in an rf phase is extremely small, such as 0.01 degree in root mean square. To make a stable rf field, we developed a high-speed DAC/ADC and an IQ modulator/demodulator to control/detect the low level rf signals. Modules with high setting/detecting accuracy are one precondition to achieve good stability. But the developed modules could have offset and gain errors because of the requirement of the high-speed operation. So we made the calibration method using a network analyzer to correct the errors. By using this method we could reduce the phase error of the C-band IQ modulator from 0.5 degree p-p to 0.1 degree p-p, for example. In this paper the detail of the calibration method and its performance will be shown.
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Poster
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THP050 |
RF Test Stand Control System for XFEL/SPring-8
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762 |
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- T. Fukui, T. Hasegawa, N. Hosoda, H. Maesaka, T. Ohshima, Y. Otake, K. Shirasawa
RIKEN/SPring-8, Hyogo
- T. Masuda, T. Morinaga, T. Ohata, S. Takahashi, M. Yamaga, A. Yamashita
JASRI/SPring-8, Hyogo-ken
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The X-ray free electron laser (XFEL) facility is under construction at SPring-8. An rf test stand was build for the XFEL to assure performance of the delivered rf components under the high-power condition and to establish a conditioning procedure for stable operation with design rf power. In addition, the test stand is used to confirm a performance of a low-level rf system, a precise water temperature control system, a vacuum system and an rf high power system. In this paper we describe a software framework to control those equipment and test results of a newly developed software component include device drivers with Solaris 10 for x86.
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