Poster

PUBDB-2026-00309

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Overview of THz Diagnostics at PITZ

Aftab, N. (Corresponding author)DESY* ; Krasilnikov, M.DESY* ; Gross, M.DESY* ; Hoffmann, A.XFEL.EU*DESY* ; Li, X.DESY* ; Oppelt, A.DESY* ; Vashchenko, G.DESY* ; Stephan, F.DESY* ; Good, J. D.DESY* ; Jung, E.Extern*DESY* ; Richard, C. J.DESY*

2025

Abstract: A terahertz (THz) free-electron laser (FEL) is developed at the Photo Injector Test Facility at DESY in Zeuthen (PITZ) to conduct proof-of-principle experiments for the European-XFEL. Narrowband 3 THz pulses with energies up to 100 μJ are generated using a single-pass, high-gain THz FEL driven by high-brightness electron beams. A dedicated diagnostic setup has been implemented for comprehensive THz radiation characterization. The pulse energy is measured using pyroelectric detectors, while spectral information is obtained via a Fourier-transform infrared (FTIR) spectrometer. The transverse radiation profile is captured with a THz camera. Linear polarization of the THz pulses is confirmed through a polarizer angle scan. Additionally, an in-house Michelson interferometer has been commissioned to enable spectral diagnostics at different THz stations.

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Contributing Institute(s):

1. Technologie (Z_PITZ)

Research Program(s):

1. 621 - Accelerator Research and Development (POF4-621) (POF4-621)

Experiment(s):

1. Photo Injector Test Facility

Appears in the scientific report 2025

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