Pulse-by-Pulse Beam Parameter Switching of High-Quality Beams for Multi-Beamline Operation at SACLA

Hirokazu Maesaka, Toru Fukui, Toru Hara, Taichi Hasegawa, Naoyasu Hosoda, Chikara Kondo, Shin-Ichi Matsubara, Osamu Morimoto, Takashi Ohshima, Yuji Otake, Yasuyuki Tajiri, Shinichiro Tanaka (+7 others)
The main linac of the X-ray free electron laser (XFEL), SACLA, provides electron beams to two XFEL beamlines and a beam transport line to the SPring-8 storage ring. In order to utilize these beamlines at the same time, a kicker magnet was installed into the switch yard and electron beams with a 60 Hz repetition rate can be distributed to these beamlines pulse-by-pulse. Since a beam energy and an optimum bunch length are usually different for each beamline, the operation condition of each
more » ... tion of each acceleration unit, such as the rf phase, the trigger permission, etc., has to be changed pulse-by-pulse. Even in that case, the electron beam quality, such as 1 mm mrad normalized emittance, 10 fs bunch length, 10 kA peak current, etc., must not be deteriorated. At first, we developed a parameter control software that was able to manage two XFEL beamlines with an equal repetition rate. Different energy beams with sufficient quality for lasing were successfully distributed to the two XFEL beamlines and the XFEL performances of both beamlines were optimized simultaneously. The development status of a new parameter switching system with an arbitrary sequence of the destinations will also be reported.
doi:10.18429/jacow-linac2018-fr1a06 fatcat:hrke3pvk7zdlxkzk34gdjwe53i