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Postdoc Linear Accelerator Simulations at Lund University

Lund University has an opening postdoctoral position in nanotechnology. This fellowship is last for three years and posible to extend. Applications are welcome before September 12, 2019.

MAX IV is a Swedish national large-scale research laboratory hosted by Lund University. It provides scientists from Sweden as well as internationally, with state-of-the-art instrumentation for research in areas such as engineering, physics, structural biology, chemistry and nanotechnology. Fully developed it will receive more than 2 000 scientists annually, conducting ground-breaking experiments in materials and life sciences using the brilliant X-ray light. As a national laboratory, MAX IV is operated in agreement with governmental regulations, and in compliance with major funders such as the Swedish Research Council (VR) and the Wallenberg Foundation. 250 people are currently employed at MAX IV Laboratory, and 16 beamlines are funded. The facility is in a ramp-up phase with 3 beamlines now receiving users and 13 more scheduled to be commissioned and built to receive users within the next few years. The facility is dimensioned for 25-28 beamlines.

We are looking for a Post Doc to the SXL project The Wallenberg foundation, Lunds University (LU), The Royal institute of technology (KTH), Stockholm University (SU), Uppsala University (UU) and MAX IV Laboratory have jointly committed to fund a conceptual design report for a Soft X-Ray Free Electron Laser (SXL), to be driven by the MAX IV 3 GeV LINAC. With a total cost of 30 MSEK, the CDR project was officially started on March 2018 and has a duration of three years. The CDR will require both design work and extensive simulations as well as practical work involving development and commissioning of diagnostics, measurements and characterisation of the electron bunch. The MAX IV bunch compressors are designed to give a positive R56 and therefore use the positive RF slope to create the energy chirp. This lets us use the natural T566 in the compressor for linearization of longitudinal phase space. This technique is stable and cost effective compared to compressing and linearising in a chicane and harmonic cavity. It also leads to a different bunch shape that brings both benefits and challenges for an FEL. Within the SXL CDR project, the linac needs further theoretical studies and simulations to optimize pulses both longitudinally and transversally. Chromatic effects and CSR beam degradation need to be minimized and the resulting re-design implemented in start-2-end simulations for the SXL. This work is the most important part of the announced post-doc position. On top of theoretical work for the CDR, practical characterization and optimisation of the existing electron beam to suit driving a Soft X-ray Laser is in progress. To access the longitudinal phase space and slice parameters of the electron beam, and fully characterize the bunch compression scheme, a transverse deflecting cavity (TDC) setup is being designed and built at MAX IV. Participation in the commissioning of the TDC is another part of the tasks for the announced post-doc position. Perform accelerator simulations for the MAX IV linear accelerator as a driver for the SXL Design needed upgrades for the MAX IV linac lattice and bunch compressors Theoretical optimization of the electron pulses with respect to CSR and chromatic effects Perform the accelerator part of start-to-end simulations for SXL Participate in and have duties for operation and commissioning of the MAX IV linac Perform theoretical and practical work to characterize pulses in the MAX IV linac Participate in the commissioning of Transverse deflecting cavity (TDC) Significant experience in beam dynamics calculations of bunch compression, using the code ELEGANT or equivalent Knowledge of the MAX IV linear accelerator lattice and compression concept Appointment to a post-doctoral position requires that the doctoral degree or equivalent is completed no more than three years before the last date for applications. Under special circumstances, the doctoral degree can have been completed earlier. For candidates with longer experience, appointment will be as a temporary scientist. This is a two year temporary employment.


Summary:

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