The University of Liverpool, Liverpool, United Kingdom
MAX IV Laboratory, Lund University, Lund, Sweden
Cockcroft Institute, Warrington, Cheshire, United Kingdom
Lund University, Division of Atomic Physics, Lund, Sweden
STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
Bunch length measurements with femtosecond resolution are a key component in the optimisation of beam quality in FELs, storage rings, and plasma-based accelerators. This contribution presents the development of a novel single-shot bunch length monitor with femtosecond resolution, based on broadband imaging of the spatial distribution of emitted coherent radiation. The technique can be applied to many radiation sources; in this study the focus is coherent transition radiation (CTR) at the MAX IV Short Pulse Facility. Bunch lengths of interest at this facility are <100 fs FWHM; therefore the CTR is in the THz to Far-IR range. To this end, a THz imaging system has been developed, utilising high resistivity float zone silicon lenses and a pyroelectric camera; building upon previous results where single-shot compression monitoring was achieved. This contribution presents simulations of this new CTR imaging system to demonstrate the synchrotron radiation mitigation and imaging capability provided, alongside initial measurements and a bunch length fitting algorithm, capable of shot-to-shot operation. A new machine learning analysis method is also discussed.
MAX IV Laboratory, Lund University, Lund, Sweden
Stockholm University, Stockholm, Sweden
Uppsala University, Uppsala, Sweden
Lund University, Lund, Sweden
Stockholm University, Department of Physics, Stockholm, Sweden
FYSIKUM, AlbaNova, Stockholm University, Stockholm, Sweden
KTH Physics, Stockholm, Sweden
The SXL (Soft X-ray Laser) project developed a conceptual design for a soft X-ray Free Electron Laser in the 1–5 nm wavelength range, driven by the existing MAX IV 3 GeV linac. In this contribution we will focus on the FEL operation modes developed for the first phase of the project based on two different linac modes. The design work was supported by the Knut and Alice Wallenberg foundation and by several Swedish universities and organizations (Stockholm, Uppsala, KTH Royal Institute of Technology, Stockholm-Uppsala FEL center, MAX IV laboratory and Lund University).