Slice energy spread measurement in the low energy photoinjector

Qian, Houjun; Krasilnikov, M.; Lueangaramwong, Anusorn; Li, Xiangkun; Lishilin, Osip; Aboulbanine, Zakaria; Adhikari, Gowri; Aftab, Namra; Boonpornprasert, Prach; Georgiev, G.; Good, James; Groß, Matthias; Koschitzki, Christian; Niemczyk, Raffael; Oppelt, A.; Shu, Guan; Stephan, F.; Vashchenko, G.; Weilbach, Tobias

doi:10.1103/physrevaccelbeams.25.083401

Cited by 6 publications

(3 citation statements)

References 44 publications

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“…Measurements at European XFEL, 40 m from the gun area, for beam charge of 250 pC show slice energy spread of 6 keV [21]. More recent publications reported slice energy spread of 2 KeV for 250pC, 20 m from the rf gun at the PhotoInjector Test facility at DESY Zeuthen (PITZ) [22].…”

Section: Discussionmentioning

confidence: 99%

Theory and design consideration of a THz superradiant waveguide FEL

Weinberg,

Gover,

Nause

et al. 2024

Front. Phys.

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We present theoretical analysis and design considerations of a THz superradiant FEL. We derive analytical expressions for the spectral parameter of THz radiation, emitted superradiantly in a rectangular waveguide using a Longitudinal Section Magnetic mode expansion. The results compare well with numerical simulations using UCLA GPTFEL code. GPT simulations of the accelerator e-beam transport show that the chirp provided by a hybrid photocathode RF gun, can produce tight bunching at the undulator site below σ = 100fs. This enables intense superradiant emission up to 3THz, limited by the beam bunching factor. Phase-space analysis of the beam transport indicates that keeping the beam bunching parameter small enough for higher THz frequency operation is limited by the energy spread of the beam in the gun.

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Section: Discussionmentioning

confidence: 99%

Theory and design consideration of a THz superradiant waveguide FEL

Weinberg,

Gover,

Nause

et al. 2024

Front. Phys.

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“…The energy spread and bunch length are slightly increased after inserting the slit with some kinks at the edges but the overall phase space structure is retained. This can be categorized as a systematic error because of correlation between p z and radial plane after introduction of the slit [8].…”

Section: Space Charge Effectsmentioning

confidence: 99%

Improvements in longitudinal phase space tomography at PITZ

Aftab,

Boonpornprasert,

Georgiev

et al. 2024

J. Phys.: Conf. Ser.

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Methodical studies to improve the existing e-beam Longitudinal Phase Space (LPS) tomography were performed at the Photo Injector Test facility at DESY in Zeuthen. Proof-of-principle simulations were done to address some core concerns e.g. booster phase range, space charge effects and noisy artefacts in results. Phase advance analysis was done with the help of an analytical model that determined the booster phase range and step size. A slit was introduced before the booster to truncate the beam and reduce space charge forces. The reconstruction method adopted was image space reconstruction algorithm owing to its assurance of non-negative solution. An initial scientific presumption of LPS from low energy momentum measurements was established to reduce artefacts in the phase space. This paper will explain the proof-of-principle simulations highlighting the key aspects to obtain accurate results. Reconstructed LPS for different experimental cases will be presented to demonstrate the diagnostic capability.

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“…This method is inspired by similar ones where certain beam or lattice parameters are varied to obtain the screen resolution. [15][16][17]19,20 It is an implementation of the approach proposed in Ref. 17 for a location without dispersion.…”

Section: Measurement Setupmentioning

confidence: 99%

Testing high-resolution transverse profile monitors by measuring the dependence of the electron beam size on the beam energy at SwissFEL

Juranić

Prat

2023

Review of Scientific Instruments

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Transverse profile monitors are essential devices to characterize particle beams in accelerators. Here, we present an improved design of beam profile monitors at SwissFEL that combines the use of high-quality filters and dynamic focusing. We reconstruct the profile monitor resolution in a gentle way by measuring the electron beam size for different energies. The results show a significant improvement of the new design compared to the previous version, from 20 to 14 µm.

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Slice energy spread measurement in the low energy photoinjector

Cited by 6 publications

References 44 publications

Theory and design consideration of a THz superradiant waveguide FEL

Theory and design consideration of a THz superradiant waveguide FEL

Improvements in longitudinal phase space tomography at PITZ

Testing high-resolution transverse profile monitors by measuring the dependence of the electron beam size on the beam energy at SwissFEL

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