Post-Doc : Design and performance evaluation of the FCCC-ee positron -source system


The position is at “Laboratoire de Physique des 2 Infinis Irène Joliot-Curie” (IJCLab), in the Beam Instrumentation, Manipulation and Physics team (BIMP) of the Accelerator division of the laboratory.
The work will mainly involve the design and detailed simulation studies of the positron injector for the e+e- Future Circular Collider FCC-ee. The FCC-ee is a high-luminosity, high-precision circular collider to be constructed in a new 100 km tunnel in the Geneva area. It is part of the Future Circular Collider design study at CERN, and would be the first step towards the long-term goal of a 100 TeV proton-proton collider. The physics case is well established and the FCC-ee operation is foreseen at 91 GeV (Z-pole), 160 GeV (W pair production threshold), 240 GeV (Higgs resonance) and 350 GeV (t-tbar threshold). Positron injector is one of the key elements of the FCC-ee requiring special attention. Due to the large 6D production emittance and important thermal load in the production target, the positron source characteristics define many of the collider parameters.


The IJCLab positron source group will focus on the design and optimization of the FCC-ee positron injector system. The postdoctoral fellow is expected to work on the different positron production schemes taking into account the thermo-mechanical constraints imposed by the target material. Several options of the positron accelerating-capture system will be studied to arrive to an optimized and realistic design of the positron injector capable to deliver the FCC-ee design parameters. Thus, a positron source demonstrator for novel target and capture system using the 6 GeV linac of the SwissFEL facility at PSI will be realized to validate the proposed concept. This project is performed in close collaboration with CERN, PSI (Switzerland) and also may involve exchanges with KEK (Tsukuba, Japan).


  • Knowledge of particle and/or accelerator physics
  • Experience in computing (C++, MATLAB) and knowledge of relevant software packages such as GEANT4, FLUKA are
  • Need of high-level skills in the accelerator design and beam optics.
  • Skills in accelerator design and beam dynamics tools like ASTRA, MADX, Elegant, GPT…
  • Ability to communicate and reason, analysis, synthesis and critical thinking
  • Ability to learn and develop skills, flexibility and adaptability, creativity
  • Languages: French and/or English (written/oral)
  • Autonomy, organizational capacity and ability to report

Training and professional experiences:

PhD in particle and/or accelerator physics with up to 3 years of experience of post-doctoral positions.


Between 2693 and 3839 euros gross salary per month, depends on experience.


IJCLab is a CNRS/IN2P3, Université Paris-Saclay and Université de Paris, laboratory located at the campus of the University ParisSud at Orsay. The campus is conveniently located 20 km south of Paris and is easily reachable by regional train (35 mins). IJCLab is born in January 2020 from the merger of five laboratories (CSNSM, IMNC, IPN, LAL, LPT). The staff consists of almost 560 permanent staff (340 engineers, technicians and administrative staff and 220 researchers and teacher-researchers) and around 200 non-permanent staff, including 120 doctoral students. The laboratory’s research themes are nuclear physics, high-energy physics, theoretical physics, astroparticles, astrophysics and cosmology, particle accelerators, energy and the environment and health. IJCLab has very significant technical capacities (around 280 engineers and technicians) in all the major areas required to design, develop / implement the experimental devices necessary for its scientific activity, as well as the design, development and use of instruments.

The BIMP team of the Pole Accelerator is composed to 22 peoples engaged in various domains of the accelerator conception and associated projects like FCC, ThomX, MYRRHA, SPIRAL2, MLL-TRAP… The candidate is expected to play an essential role in the positron source group. This group has a longstanding expertise in positron sources acquired through numerous studies and realizations that concerned fixed target experiments with positrons, positron sources for storage rings (ACO, DCI and SuperACO), and studies for e+e- circular (LEP, SuperB) and linear colliders (CLIC, ILC).

Travels in France, Europe and Japan are to be expected.
More information about FCC can be found at:


Candidates are requested to submit a motivation letter, a CV to Portail Emploi CNRS :
and recommendation letter(s) to Iryna CHAIKOVSKA
More information about IJCLab: