Lunds universitet, MAX IV, Accelerator Developement

Lunds universitet grundades 1666 och rankas återkommande som ett av världens 100 främsta lärosäten. Här finns 40 000 studenter och 7 600 medarbetare i Lund, Helsingborg och Malmö. Vi förenas i vår strävan att förstå, förklara och förbättra vår värld och människors villkor.

MAX IV är ett svenskt nationellt forskningslaboratorium med Lunds universitet som värduniversitet. Det tillhandahåller toppmodern instrumentering åt forskare från såväl Sverige som internationellt, för forskning inom områden som teknik, fysik, strukturbiologi, kemi och nanoteknik. Fullt utbyggd kommer MAX IV att ta emot mer än 2 000 forskare årligen vilka genomför banbrytande experiment inom material och biovetenskap med hjälp av det briljanta röntgenljuset. Som ett nationellt laboratorium drivs MAX IV i enlighet med statliga föreskrifter och i överensstämmelse med villkor från stora bidragsgivare som Vetenskapsrådet och Wallenbergstiftelsen. 250 personer är för närvarande anställda vid MAX IV. Anläggningen befinner sig i en uppbyggnadsfas med 16 strålrör finansierade varav tre tar emot användare idag, resterande 13 strålrör kommer att ta emot användare inom de närmaste åren. Anläggningen är dimensionerad för 25-28 strålrör.

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.

Job description

  • 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)


Required qualifications

  • PhD in accelerator physics
  • Significant experience in beam dynamics calculations of bunch compression, using the code ELEGANT or equivalent
  • Theoretical and practical experience with a linear accelerator


Additional and meriting qualifications

  • Experience with other accelerator simulation codes
  • Experience with a TDC
  • 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.

Anställningsform Visstidsanställning längre än 6 månader
Anställningens omfattning Heltid
Antal lediga befattningar 1
Sysselsättningsgrad 100
Ort Lund
Län Skåne län
Land Sverige
Referensnummer PA2019/2478
Kontakt
  • Åke Andersson, +46462220414
Facklig företrädare
  • SACO:Saco-s-rådet vid Lunds universitet, 046-222 93 64
  • SEKO: Seko Civil, 046-222 93 66
Publicerat 2019-08-22
Sista ansökningsdag 2019-09-29

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