PhD - Implementing a monochromatic operation mode in FCC-ee and possible experiment testing (M/F)

  • Orsay, Essonne
  • CDD
  • Temps-plein
  • Il y a 17 jours
Offer DescriptionThe Irène Joliot-Curie Physics Laboratory of 2 Infinities (IJCLab) is a UMR under the supervision of the CNRS (IN2P3), the University of Paris-Saclay and the University of Paris is located on the campus of the University of Paris -Saclay in Orsay. The laboratory is located on the campus of the Université Paris-Sud, Université Paris-Saclay in Orsay. The campus is located 20 km south of Paris and easily accessible by RER in 35 minutes.
IJCLab was born in 2020 from the merger of five units (CSNSM, IMNC, IPN, LAL, LPT). The staff is made up of nearly 560 permanent (340 engineers, technicians and administrators and 220 researchers and teacher-researchers) and approximately 200 non-permanent including 120 doctoral students. The research themes of the laboratory 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 IT) in all the major fields required to design, develop / implement the experimental devices necessary for its scientific activity, as well as the design, development and use of instruments.
The research project subject of this PhD will be carried at the Beam Physics, Instrumentation and Manipulation (BIMP) team at the Accelerator Department of IJClab. More specifically in the framework of the Next Particle Collider (NPC) and, in particular, FCC. The FCC study, hosted by CERN, is an international collaboration of more than 150 universities, research institutes and industrial partners from all over the world, formed to explore the feasibility of a future post-LHC circular collider aimed substantially extending humankind's knowledge about the universe by increasing the energy and luminosity compared with past and existing colliders. FCC consists of two stages, the first stage being a highest-luminosity electron-positron collider serving as Higgs and electroweak factory. The IJCLab-FCC team is part of the collaboration; currently the team is involved in FCC-ee studies. At CERN the accelerator and detector efforts are focusing on completing the lepton collider design, optimization of its beam optics, and finalizing the configuration. In recent years, the possible measurement of the electron Yukawa coupling, in a dedicated additional running mode at 125 GeV c.m. has attracted an ever-growing interest. The CERN Accelerator and Beam Physics comprises about 100 accelerator physicists; only a small, but rising fraction of these presently contributes to the FCC. Regarding the SuperKEKB collaboration, either the IJCLab and the CERN are current collaborators. SuperKEKB is also included in the RISE EU EAJADE project and it is considered as the ideal state-of-the-art training facility for the operation of future Higgs factories. Regarding BEPC-II collider in IHEP the responsible of the project has a collaboration project on this topic in the framework of the IN2P3 France China Particle Physisc Laboratory (FCPPL).The FCCee collider will have four different energy operation modes: 45 GeV for Z production, 80 GeV for WW production, 120 GeV for H(ZH) production and 182.5 GeV for ttbar production. The known as H mode or Higgs production could allow the measurement of the electron Yukawa coupling, in dedicated runs at 125 GeV centre-of-mass energy, provided that the centre-of-mass energy spread, can be reduced to about 5-10 MeV to be comparable to the width of the standard model Higgs boson. The natural collision-energy spread at 125 GeV, due to synchrotron radiation, is about 50 MeV. The use of a special collision technique known as monochromatization is one way to accomplish it. The most direct way to implement this collision mode consists of introducing a dispersion different from zero but opposite sign for the two colliding beams at the Interaction Point (IP). A first optics design of the introduction of the dispersion in the IP for FCC-ee Interaction Region (IR) has been made, as well as preliminary beam dynamic studies, compatibility and integration issues with the baseline standard operation mode without dispersion in the IP.
The main objectives of this PhD work will be in one hand to study in detail the beam dynamics of this new mode of collision, including the dynamic aperture (DA) optimization and the bean-beam. And in the other hand a parametric study and possible implementation in one of the current running colliders e+e- at lower energies as: SuperKEKB, Daphne or BEPC-II .Methodology
The conception and design of an IR in a collider supposes the familiarization with accelerator optics and beam dynamics of the accelerators. Learning the use of optics, Dynamic Aperture (DA) or beam-beam simulation tools programs, such as GuineaPig, MADX, PTC, SAD, Lifetrac, and/or XSuite, will be necessary to perform the optics design and study of the beam dynamics. In particular, the monochromatization optics has to be as flexible as possible to cope with the different operations scenarios envisaged. The collaboration with other international teams, in particular, in the frame of the worldwide FCC collaboration, will also be crucial in this project.
Objectives
The main goals of the project to which the PhD student will contribute are:
1) Optics and beam dynamics studies with dispersion in the IP
2) Tracking - DA and beam-beam simulations
3) Comparison and benchmarking with the case without dispersion in the IP
4) Parametric study and possible experimental implementation in current running e+e- low-energy colliders
References
[1] M. Benedikt et al. (eds.), “Future Circular Collider: Conceptual Design Report Vol. 2”, CERN-ACC-2018-0057.
[2] A. Renieri, “Possibility of Achieving Very High Energy Resolution in e+e− Storage Rings,” Frascati Preprint INF/75/6(R) (1975).
[3] A.A. Avdienko et al., “The Project of Modernization of the VEPP-4 Storage Ring for Monochromatic Experiments in the Energy Range of Ψ and Υ Mesons,” Proc. 12th Intern. Conf. High Energy Accelerators, Fermilab, 1983, p. 186.
[4] K. Wille and A.W. Chao, “Investigation of a Monochromator Scheme for SPEAR,” SLAC/AP-32 (1984).
[5] Yu.I. Alexahin, A.N. Dubrovin, A.A. Zholents, “Proposal on a Tau-Charm Factory with Monochromatization”, in Proc. 2nd European Particle Accelerator Conf. (EPAC'90), Nice, France, Jun. 1990, pp. 398-401.
[6] M. Jowett, “Feasibility of a Monochromator Scheme in LEP,” CERN LEP Note 544, September (1985).
[7] A. Zholents, “Polarized J/Ψ Mesons at a Tau-Charm Factory with a Monochromator Scheme,” CERN SL/97-27, June (1992).
[8] A. Faus-Golfe and J. Le Duff, “Versatile DBA and TBA Lattices for a Tau-Charm Factory with and without Beam Monochromatization,” Nucl. Instr. Methods A 372 (1996) 6-18.
[9] M. A. Valdivia García, F. Zimmermann, and A. Faus-Golfe, “Towards a Mono-chromatization Scheme for Direct Higgs Production at FCC-ee”, in Proc. 7th Int. Particle Accelerator Conf. (IPAC'16), Busan, Korea, May 2016, WEPMW009, pp. 2434-2437. doi:10.18429/JACoW-IPAC2016-WEPMW009
[10] M. A. Valdivia García and F. Zimmermann, “Effect of Beamstrahlung on Bunch Length and Emittance in Future Circular e+e− Colliders”, in Proc. 7th Int. Particle Accelerator Conf. IPAC16, Busan, Korea, May 2016, WEPMW010, pp. 2438- 2441. doi:10.18429/JACoW-IPAC2016-WEPMW010.
[11] P. Chen and D. Schulte, “Beam-Beam Effects in Linear Colliders,” Section 2.5.3 in A.W. Chao, K.H. Mess, M. Tigner, F. Zimmermann (eds.), Handbook of Accelerator Physics and Engineering, second Edition, World Scientific, New Jersey (2013).
[12] M. A. Valdivia García, D. El Khechen, K. Oide, and F. Zimmermann, “Quantum Excitation due to Classical Beamstrahlung in Circular Colliders”, in Proc. 9th Int. Particle Accelerator Conf. (IPAC'18), Vancouver, Canada, Apr.- May 2018, MOPMF068, pp. 281-284. doi:10.18429/ JACoW-IPAC2018-MOPMF068
[13] K. Oide et al., “Design of beam optics for the future circular collider e+e− collider rings,” Phys. Rev. Accel. Beams 19, 111005
[14] F. Zimmermann and M. A. Valdivia García, “Optimized Monochromatization for Direct Higgs Production in Future Circular e+e− Colliders”, in Proc. 8th Int. Particle Accelerator Conf. (IPAC'17), Copenhagen, Denmark, May 2017, WEPIK015, pp. 2950-2953. doi:10.18429/JACoW-IPAC2017-WEPIK015.
[15] Zimmermann and M. A. Valdivia García, “Effect of emittance constrains on monochromatization at the Future Circular e+e− Collider”, in Proc. 10th Int. Particle Accelerator Conf. (IPAC'19), Melbourne, Australia, May 2019, MOPMP035. doi:10.18429/JACoW-IPAC2017-WEPIK015 10th Int. Particle Accelerator Conf. IPAC2019, Melbourne, Australia JACoW Publishing ISBN: 978-3-95450-208-0 doi:10.18429/JACoW-IPAC2019-MOPMP035 MC1: Circular.
[16] H. Jiang, A. Faus-Golfe, F. Zimmermann, K. Oide, Z. Zhang, “First Optics Design for a transverse monochromatic scheme for the directs-channel Higgs production at FCC-ee collider”, WEPOPT017, IPAC2022, Bangkok, Thailand.
[17] Z. D. Zhang, A. Faus-Golfe, H. P. Jiang, B. W. Bai, F. Zimmermann, K. Oide, “Monochromatization Interaction Region Optics Design for Direct s-channel production at FCC-ee “, SUPM031 IPAC2023, Venice, Italy.
[18] EAJADE (Europe-America-Japan Accelerator Development and Exchange programme), HORIZON-MSCA-2021-SE-01 Project: 101086276,RequirementsResearch Field Physics Education Level Master Degree or equivalentLanguages FRENCH Level BasicResearch Field Physics Years of Research Experience NoneAdditional InformationAdditional commentsThe candidate must have a degree in engineering and/or a Masters in Physics. The post requires sound knowledge of basic accelerator physics, a high level of communication skills, both oral and written (English required) to be able to present at conferences and write articles in scientific publications, and sound knowledge of the programming and analysis languages used in the field (e.g.: C++, PYTHON,..). We are looking for a PhD fellow who will be able to become fully involved with the project, with a thirst for knowledge, a certain independence of thought and strong motivation to develop skills in the field of accelerator beam physics. In addition, the candidate must be able to work in a team on multi-disciplinary projects.
Applications must include a detailed CV; at least two references (people who may be contac¬ted); a cover letter of one page; a one-page résumé of the dissertation for the Masters; grades for the Masters 1 or 2 or the engineering degree). Website for additional job detailsWork Location(s)Number of offers available 1 Company/Institute Laboratoire de physique des 2 infinis - Irène Joliot-Curie Country France City ORSAY GeofieldWhere to apply WebsiteContact CityORSAYSTATUS: EXPIRED

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