TY - CPAPER
AU - Lechner, C.
AU - Ackermann, S.
AU - Azima, A.
AU - Bödewadt, J.
AU - Brenner, G.
AU - Dohlus, M.
AU - Drescher, M.
AU - Ekanayake, N.
AU - Golz, T.
AU - Hacker, K.E.
AU - Khan, S.
AU - Laarmann, T.
AU - Lazzarino, L.L.
AU - Limberg, T.
AU - Maltezopoulos, Th.
AU - Miltchev, V.
AU - Molo, R.
AU - Plath, T.
AU - Rönsch-Schulenburg, J.
AU - Roßbach, J.
AU - Schneidmiller, E.
AU - Stojanovic, N.
AU - Yurkov, M.V.
TI - Suppression of FEL Lasing by a Seeded Microbunching Instability
J2 - Proc. of FEL2015
AB - Collective effects and instabilities due to longitudinal space charge and coherent synchrotron radiation can degrade the quality of the ultra-relativistic, high-brightness electron bunches driving free-electron lasers (FELs). In this contribution, we demonstrate suppression of FEL lasing induced by a laser-triggered microbunching instability at the free-electron laser FLASH. The interaction between the electron bunches and the 800-nm laser pulses takes place in an undulator upstream of the FEL undulators. A significant decrease of XUV photon pulse energies has been observed in coincidence with the laser-electron overlap in the modulator. We discuss the underlying mechanisms based on longitudinal space charge amplification (LSCA) [E.A. Schneidmiller and M.V. Yurkov, Phys. Rev. ST Accel. Beams 13, 110701 (2010)] and present measurements.
PB - JACoW
CY - Geneva, Switzerland
SP - 289
EP - 292
KW - electron
KW - laser
KW - FEL
KW - undulator
KW - photon
DA - 2015/12
PY - 2015
SN - 978-3-95450-134-2
DO - 10.18429/JACoW-FEL2015-TUA02
UR - http://accelconf.web.cern.ch/AccelConf/FEL2015/papers/tua02.pdf
ER -