Mainz 2022 – scientific programme

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AKBP: Arbeitskreis Beschleunigerphysik

AKBP 10: Electron Accelerators and FEL’s

AKBP 10.1: Talk

Wednesday, March 30, 2022, 14:00–14:15, AKBP-H14

Particle tracking study for the new laser heater at FLASH — •Dmitrii Samoilenko¹, Pardis Niknejadi², Christopher Gerth², Lucas Schaper², and Wolfgang Hillert¹ — ¹Institute for Experimental Physics, University of Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany — ²Deutsches Elektronen-Synchrotron DESY, Notkestrasse 85, 22607 Hamburg (Germany)

The FLASH (Free electron LASer in Hamburg) facility is currently in a scheduled 9-month shutdown during which some of the upgrades planned in the FLASH2020+ project are being implemented. Among these upgrades is a laser heater which will be installed just upstream of the first bunch compressor, allowing an uncorrelated energy spread in the electron beam to be induced. Increasing energy spread makes it possible to reduce the microbunching gain through the machine and thus counteract one of the most detrimental effects for FEL operation. The amount of induced energy spread has to be carefully balanced to suppress microbunching. At the same time the total energy spread at the end of the linac, which is enhanced especially during the bunch compression, should be kept at a reasonable value not to deteriorate FEL operation. In this work, we use particle tracking simulations to (i) evaluate the performance of the laser heater in terms of induced energy spread; (ii) investigate how the energy spread evolves throughout the rest of the linac. The results are expected to be valuable also for the commissioning of the laser heater.