TY  - JOUR
AU  - Serkez, Svitozar
AU  - Geloni, Gianluca
AU  - Guetg, Marc
AU  - Kocharyan, Vitali
AU  - Liu, Shan
AU  - Saldin, Evgeni
TI  - Delay-Detune Scan for Longitudinal Electron Beam Characterization at Free-Electron Lasers
JO  - Physical review accelerators and beams
VL  - 23
IS  - 12
SN  - 1098-4402
CY  - College Park, MD
PB  - American Physical Society
M1  - PUBDB-2021-04998
SP  - 122801
PY  - 2020
AB  - We present first experimental results of a novel method to study the energy chirp of the electron beam lasing window at a free-electron laser operating in self-amplified spontaneous emission mode. The method requires a single magnetic chicane splitting the FEL undulator into two parts of several gain lengths each. Undulator segments should have variable gaps. By scanning both the delay in the chicane and detuning in a part of the undulators, one can retrieve the linear component of both the radiation frequency chirp and the electron energy chirp. In addition, such scan improves the accuracy of the previously proposed autocorrelation-based pulse duration measurement technique. The proposed method targets facilities that lack direct diagnostics of the electron beam longitudinal phase space distribution. It also can be extended to diagnose transverse tilts of the beam.
KW  - Beam Control, Diagnostics, and Feedback (autogen)
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000614890000004
DO  - DOI:10.1103/PhysRevAccelBeams.23.122801
UR  - https://bib-pubdb1.desy.de/record/472329
ER  -