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@inproceedings{orlandi:ibic2023-tup026, author = {G.L. Orlandi}, title = {{Bunch Compressor Monitors for the Characterization of the Electron Bunch Length in a Linac-Driven FEL}}, % booktitle = {Proc. IBIC'23}, booktitle = {Proc. 12th Int. Beam Instrum. Conf. (IBIC'23)}, eventdate = {2023-09-10/2023-09-14}, pages = {235--239}, paper = {TUP026}, language = {english}, keywords = {electron, FEL, radiation, detector, linac}, venue = {Saskatoon, Canada}, series = {International Beam Instrumentation Conference}, number = {12}, publisher = {JACoW Publishing, Geneva, Switzerland}, month = {12}, year = {2023}, issn = {2673-5350}, isbn = {978-3-95450-236-3}, doi = {10.18429/JACoW-IBIC2023-TUP026}, url = {https://jacow.org/ibic2023/papers/tup026.pdf}, abstract = {{The lasing performance of a Free Electron Laser (FEL) strongly relies on a precise characterization of the electron bunch length and on the control and stabilization of the bunch compression settings of the machine under normal user operations. In a FEL driver linac, the so-called Bunch Compressor Monitors (BCMs) normally ensure the non-invasive monitoring of the electron bunch length. BCMs, being sensitive to the temporal coherent threshold of the radiation energy emitted by the electron beam crossing the last dipole of a magnetic chicane or a holed diffraction screen just downstream, can provide a bunch length dependent signal resulting from the integration of the detected radiation pulse energy over the acceptance frequency band of the detector. Thanks to the non-invasiveness, BCMs are primary diagnostics in a FEL to stabilize the bunch compression by feeding back the RF settings of the accelerating structure. In this contribution, we present a formal method to determine an absolute measurement of the electron bunch length from the analysis of a BCM signal (*).}}, }