The Machine Directorate at the European Spallation Source (ESS) in Lund, Sweden, invites applications for a Post Doc Accelerator Scientist position.

Description of directorate/division
The Accelerator Division is responsible for the design, construction, commissioning and operation of the ESS accelerator. The pulsed superconducting linac, to be built in Lund, will produce a 5 MW average power proton beam, driving the world’s most powerful neutron source. The Beam Physics Section is responsible for the study of the dynamics of the protons in the linac, development of the physics software applications for the control room and leading the commissioning and operation of the ESS linac.

Job description and responsibilities:
The Beam Physics section of the Accelerator Division at ESS is opening a postdoctoral position on the upgrade study of the ESS linac for the proposed neutrino super beam facility. The position is financed through the Horizon 2020 grant from the EU.
The study is focused on the potential of the ESS linac for an upgrade feasibility to produce a high-flux neutrino beam, simultaneously with the high-flux neutron beam, for the accumulator ring of the ESSnuSB project, which aims at the discovery of Lepontic CP violation. The ESS linac power will need to be increased so that the neutron users will still receive the same proton power while an additional 5 MW of proton beam is delivered to the accumulator ring. The candidate will, in collaboration with others at the ESS Accelerator Division, study the design of the ESS linac and work on simulating the transport of the H- beam for the ESSnuSB linac, study the effect of higher order modes, HOMs, on the beam, and simulate the losses from the H- beam in the linac. The candidate should work with those designing the accumulator and the target for optimizing and proposing a design which improves the overall efficiency of such a facility.
Work Description: Simulations of the beam dynamics with space charge of a high intensity H- beam, including transport, loss simulations and different stripping and loss phenomena, and study the mutual effect of HOMs and the beam on each other. Experience in design of similar or other high power linacs and injectors to compressor rings is preferred. Specifically study different operational modes, and study and optimize the beam injection and extraction. Regular presentations of the different development steps will be necessary, in the presence of specialists on the different topics.

Required qualifications:
The applicant must have a doctoral degree, at the start of employment, in physics or a related area, with experience in accelerator physics and, preferably, beam dynamics of hadron linacs.
Excellent capabilities to perform independent research shall be demonstrated through publications in peer-reviewed journals and/or at important conferences in the accelerator domain. Solid knowledge of particle tracking and beam optics codes is an advantage. Knowledge on using Machine Learning on reducing the losses of the H- beam is also an advantage.
Our Ideal Candidate will have:
A strong interest in academic research, an interest to collaborate and exchange competences with other accelerator physicists and who is willing to travel for that. Good oral and written proficiency in English is required, as well as the capacity to work both independently and in a team. The candidate shall take responsibility for the project, be innovative and have a genuine interest in physics and technology.
The Candidate should show initiative, be proactive with good interpersonal skills and be able to work under pressure (deadlines).
Our work environment is characterised by fast growth, high rate of work, and an international atmosphere with highly academic personnel. You must therefore enjoy the diversity of such and have a personality suited for the challenges it holds. In this growing organisation you will have the possibility to take part in developing new routines and processes. Our work environment is exciting and forward thinking and relies heavily on personal initiative.

What ESS can offer

ESS can offer you a variety of things, such as passionate colleagues, a vibrant melting pot of diversity, and a challenging and high paced work environment where our employees take great pride in designing and building a world leading facility for materials research. 

If you were to join ESS, you would become an important piece of the puzzle, since all our skilled staff are needed in order to fulfill the overall mission. We value and need expertise, innovative minds, great ways of leading and interacting with others, and the ability to work with people regardless of culture and background.

Duration & Location

The position is a fixed term position for two years of the start of the position

Application & Contact
Please provide your curriculum vitae and cover letter in English by clicking on “apply” and following the instructions. Please note we only accept applications via the ESS website or ESS intranet. Internal candidates are encouraged to apply through the intranet.

The deadline for applications is 2019-01-20.

For more information regarding the ESS recruitment process in general, please follow this link 

For further information regarding the position, please contact the recruiting manager, Mamad Eshraqi, mohammad.eshraqi[at] 

For further information regarding the recruitment process, please contact HR Officer Lanre Odunlami, Lanre.Odunlami[at]

For trade union information please contact Unionen / Mikael Johansson at +46 46 888 32 51 or SACO / Swedish Association of Graduate Engineers/ Riccardo Bevilacqua at +46 46 888 32 28.

We look forward to receiving your application!

The European Spallation Source ERIC, with 15 member- and observer countries, is committed to the goal of collectively building and operating a multi-disciplinary, large-scale research infrastructure based on the world’s most powerful neutron source. The European Spallation Source (ESS), will provide scientists with unique and powerful neutron scattering instruments for the study of a large range of materials – from polymers and pharmaceuticals to membranes and molecules. ESS, hosted by Sweden and Denmark, is being built in Lund in collaboration with European scientists and engineers. ESS will initiate the user programme in 2023 and will have more than 500 employees when in operations.

ESS aim to ensure that staff are employed on the basis of ability and the requirements of the job, and that no applicant or employee receives less favourable treatment because of sex, transgender identity or expression, ethnicity, religion or other belief, disability, sexual orientation or age.

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