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- Y. Otake, H. Maesaka, T. Shintake
RIKEN Spring-8 Harima, Hyogo
- T. Fukui, N. Hosoda, T. Ohata, T. Ohshima
JASRI/SPring-8, Hyogo-ken
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At RIKEN, Harima Institute, the project (SCSS) of X-FEL including the 8 GeV linac is in progress. Now, to verify feasibility of X-FEL, the 250 MeV test electron linac is building at SPring-8. A time jitter of the order of ten femto-seconds is required to the timing system of the 8 GeV linac, because of a beam pulse width of several ten femto-seconds. However, realizing this jitter value is very difficult by the present electronics technology. Therefore, we temporarily set a sub-pico-seconds time jitter as a development target, because the beam pulse width of the test linac is several pico-seconds. This jitter value had possibility to be achieved by the present technology. In accordance with the target, we developed a very low noise reference signal source that generates 238 MHz and 5712 MHz RF signals, a master trigger VME module having output pulses synchronized by 238 MHz, and a trigger delay VME module synchronized by 5712 MHz. The time jitter of the delay module is less than 700 fs, and the SSB noise of the 5712 MHz reference signal source is less than -120 dBc at 1 kHz offset. These values are enough for our present requirement.
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