TY - CPAPER
AU - Novokhatski, A.
TI - Wake Field Potentials of 'Dechirpers'
J2 - Proc. of FEL2015
AB - A corrugated structure, which is used on 'dechirpers' is usually a pipe or two plates with small corrugations (bumps) on the walls. There is a good single-mode description of the wake potentials excited by a relativistic bunch if the wave length of the mode is much longer than the distance between the bumps in the pipe. However, ultra-short bunches, which are now used in FELs, excite much higher frequency fields and the corresponding wake potentials will be very different from single-mode description. We made analyzes of these wake potentials based on a numerical solution of Maxwell's equations. The behavior of the wake fields of ultra-short bunches in corrugated structures is not much different from the fields excited usually in accelerating structures where the wake potentials are described by the exponential function. As we increase the bunch length, the wake potentials slowly transform to the form of a single mode. For a practical application we present results for a 'dechirper', which will be soon installed at LCLS. We also carried out calculations for a similar device, that was installed and measured at the Pohang Accelerator Laboratory, Korea. We find very good agreement with the experimental results.
PB - JACoW
CY - Geneva, Switzerland
SP - 157
EP - 160
KW - wakefield
KW - FEL
KW - experiment
KW - focusing
KW - electron
DA - 2015/12
PY - 2015
SN - 978-3-95450-134-2
DO - 10.18429/JACoW-FEL2015-MOP054
UR - http://accelconf.web.cern.ch/AccelConf/FEL2015/papers/mop054.pdf
ER -