A Laser Heater Undulator for FLASH2020+

Telawane, S.; Schöps, A.; Neumann, Paul; Tischer, M.; Ramm, T.; Vagin, P.

doi:10.1088/1742-6596/2380/1/012028

Journal Article/Contribution to a conference proceedings

PUBDB-2023-01311

A Laser Heater Undulator for FLASH2020+

Telawane, S.DESY* ; Schöps, A.DESY* ; Neumann, P.DESY* ; Ramm, T.DESY* ; Tischer, M.DESY* ; Vagin, P. (Corresponding author)DESY*

2023
IOP Publ. Bristol

14th International Conference on Synchrotron Radiation Instrumentation, SRI 2021, Hamburg, Germany, 28 Mar 2022 - 1 Apr 2022 Journal of physics / Conference Series 2380(1), 012028 (2023) [10.1088/1742-6596/2380/1/012028]

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Please use a persistent id in citations: doi:10.1088/1742-6596/2380/1/012028 doi:10.3204/PUBDB-2023-01311

Abstract: Space charge induced micro bunch instabilities, amplified in cascadedbunch compression stages, spoil the phase space of compressed bunches and leadto unstable seeding. To “heat” up the bunch with an external laser and induce anuncorrelated energy spread to suppresses the micro bunching instabilities, a shortundulator will be installed in front of the first compression chicane. The undulator hasa planar hybrid magnet structure with 43 mm period length, 11 full periods, 22 mmminimum gap and a deflection parameter K of 1.52 (K = (eBλ$_u$) / (2$π$m$_{ec}$), withB - max. magnetic field amplitude, λ$_u$ - period length) to match the 534 nm laserwavelength at 146 MeV beam energy. The paper describes the undulator’s compactdesign, its control system and results of magnetic measurements and tuning.

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