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TY - CONF AU - Gerth, C. AU - Allaria, E. AU - Choudhuri, A. AU - Schaper, L. AU - Schneidmiller, E. AU - Schreiber, S. AU - Tischer, M. AU - Vagin, P. AU - Vogt, M. AU - Winkelmann, L. AU - Yurkov, M.V. AU - Zemella, J. ED - Liu, Lin ED - Byrd, John M. ED - Neuenschwander, Regis T. ED - Picoreti, Renan ED - Schaa, Volker R. W. TI - Layout of the Laser Heater for FLASH²⁰²⁰⁺ J2 - Proc. of IPAC2021, Campinas, SP, Brazil, 24-28 May 2021 CY - Campinas, SP, Brazil T2 - International Particle Accelerator Conference T3 - 12 LA - english AB - The major upgrade FLASH²⁰²⁰⁺ of the FEL user facility FLASH includes an improved injector layout for the generation of the high-brightness electron beam as well as an externally seeded FEL beamline. Microbunching gain of initial modulations or shot-noise fluctuations degrade the electron beam quality, which is in particular harmful to the external seed process. To minimize the microbunching gain by a controlled increase of the uncorrelated energy spread, the installation of a laser heater is foreseen directly upstream of the first bunch compression chicane. In this paper, we present the layout of the laser heater section, which follows the original proposal published almost 20 years ago and differs in several aspects from the common layout implemented at many other FEL facilities. The considerations that have been made for the optimisation of the laser heater parameters are described in detail. PB - JACoW Publishing CP - Geneva, Switzerland SP - 1647 EP - 1650 KW - electron KW - laser KW - undulator KW - FEL KW - free-electron-laser DA - 2021/08 PY - 2021 SN - 2673-5490 SN - 978-3-95450-214-1 DO - doi:10.18429/JACoW-IPAC2021-TUPAB111 UR - https://jacow.org/ipac2021/papers/tupab111.pdf ER -