MOD03
RIKEN SPring-8 Center, Sayo-cho, Sayo-gun, Hyogo, Japan
RIKEN SPring-8 Center, Sayo-cho, Sayo-gun, Hyogo, Japan
JASRI/SPring-8, Hyogo, Japan
SES, Hyogo-pref., Japan
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MOD03 |
Present Status of SACLA | |
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| According to the increasing demand for XFEL utilization, introduction of pulse-by-pulse multi-FEL operation with full laser performance is a pressing issue, because most of experiments require a short pulse of less than 10 fs. The biggest obstacle is the emittance growth caused by CSR through a dogleg composed of a bend and a bend-back of 3 degrees, which seriously restricts on the operational peak current less than 2.5 kA. In order to solve this problem, we built a dual DBA-based dogleg using a 0.3 MW highly stable pulse power-supply in winter 2016. The full-performance pulse-by-pulse multi-FEL operation was successfully achieved in February 2017. This will be introduced in the user operation as a standard mode after Summer 2017 via the test use scheduled before the summer shutdown. On the other hand, the SXFEL user operation at BL1 has been started since 2016 and now two XFELs (BL2, BL3) and one SXFEL (BL1) beamlines are available simultaneously for user experiments at SACLA. This presentation shows the present status of SACLA focusing on the above topics. | ||
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Slides MOD03 [7.611 MB] | |
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| TUA04 | Suppression of the CSR Effects at a Dogleg Beam Transport Using DBA Lattice | 216 |
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| Multi-beamline, multi-user operation is an important issue of linac-based XFELs to improve usability and efficiency of facilities. At SACLA, the multi-beamline operation had been tested since 2015 using two beamlines (BL2 and BL3). But the CSR effects at a 3-degree dogleg beam transport of BL2 caused a projected emittance growth and instability of the beam orbit due to a high peak current of 10 kA and a short bunch duration of SACLA. Consequently, stable lasing was obtained only for elongated electron bunches with low peak currents below 3 kA. To mitigate the CSR effects, the beam optics of the dogleg was rearranged. The new beam optics are based on two DBA (double bend achromatic) structures and the transverse effects of CSR are cancelled between four bending magnets. To avoid the bunch length change, the electron beam passes an off-center orbit at the quadrupole magnets of DBA. Under the new beam optics, stable lasing has been successfully obtained with 10 kA electron bunches, and the parallel operation of the two beamlines will be started in September 2017 for user experiments. | ||
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Slides TUA04 [7.334 MB] | |
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-FEL2017-TUA04 | |
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