Suppression of the CSR Effects at a Dogleg Beam Transport Using DBA Lattice

Hara, Toru; Fukami, Kenji; Hasegawa, Taichi; Inagaki, Takahiro; Kondo, Chikara; Maesaka, Hirokazu; Morimoto, Osamu; Nakazawa, Shingo; Otake, Yuji; Tanaka, Hitoshi; Togawa, Kazuaki; Yoshioka, Masamichi

doi:10.18429/JACoW-FEL2017-TUA04

Joint Accelerator Conferences Website

The Joint Accelerator Conferences Website (JACoW) is an international collaboration that publishes the proceedings of accelerator conferences held around the world.

RIS citation export for TUA04: Suppression of the CSR Effects at a Dogleg Beam Transport Using DBA Lattice

TY - CONF
AU - Hara, T.
AU - Fukami, K.
AU - Hasegawa, T.
AU - Inagaki, T.
AU - Kondo, C.
AU - Maesaka, H.
AU - Morimoto, O.
AU - Nakazawa, S.
AU - Otake, Y.
AU - Tanaka, H.
AU - Togawa, K.
AU - Yoshioka, M.
ED - Bishofberger, Kip:Carlsten, Bruce (LANL, Los Alamos, NM, USA)[ORCID:0000-0001-5619-907X]
ED - Schaa, Volker RW
TI - Suppression of the CSR Effects at a Dogleg Beam Transport Using DBA Lattice
J2 - Proc. of FEL2017, Santa Fe, NM, USA, August 20-25, 2017
C1 - Santa Fe, NM, USA
T2 - International Free Electron Laser Conference
T3 - 38
LA - english
AB - 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.
PB - JACoW
CP - Geneva, Switzerland
SP - 216
EP - 218
KW - ion
KW - electron
KW - optics
KW - operation
KW - FEL
DA - 2018/02
PY - 2018
SN - 978-3-95450-179-3
DO - 10.18429/JACoW-FEL2017-TUA04
UR - http://jacow.org/fel2017/papers/tua04.pdf
ER -