Oleg Tchoubar

Brookhaven National Laboratory

National Synchrotron Light Source II
Bldg. 741, Room 115
P.O. Box 5000
Upton, NY 11973-5000

(631) 344-4525
chubar@bnl.gov

Expertise | Research | Education | Appointments | Publications | Awards

Expertise

Electrodynamics of synchrotron radiation, magnetostatics of insertion devices, physical optics and its applications for development of beamlines and simulation of experiments at light source facilities, scientific software development.

Research Activities

Development of algorithms and software for simulation of partially-coherent synchrotron radiation, including the processes of emission and propagation through beamline optics, as well as interaction of the synchrotron radiation with samples in experiments exploiting coherence and brightness of synchrotron light source facilities (main author of the SRW code: https://github.com/ochubar/SRW); development of numerically-efficient 3D magnetostatics computation methods and magnetic simulations software for insertion devices and other types of magnets (main author of the Radia code: https://github.com/ochubar/Radia); performing calculations in these and related areas for NSLS-II beamlines and experiments.

Education

• Ph.D. 1995: Physics, Moscow Engineering Physics Institute, Russia (rus.: candidate of physical and mathematical sciences)
• M.S. 1991: Physics, Moscow Engineering Physics Institute, Russia
• B.S. 1989: Physics, Moscow Engineering Physics Institute, USSR

Professional Appointments

• Simulations Group Leader in the Experiment Development Program of the Photon Science Division of NSLS-II at BNL
• Non Salaried Senior Research Scientist, Department of Electrical and Computer Engineering, Stony Brook University

Selected Publications

• Chubar OV (1995) Precise computation of electron-beam radiation in nonuniform magnetic fields as a tool for beam diagnostics. Review of Scientific Instruments 66:1872–1874. doi: 10.1063/1.1145810
• Chubar O, Elleaume P, Chavanne J (1998) A three-dimensional magnetostatics computer code for insertion devices. Journal of Synchrotron Radiation 5:481–484. doi: 10.1107/s0909049597013502
• Chubar O, Elleaume P, Snigirev A (1999) Phase analysis and focusing of synchrotron radiation. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 435:495–508. doi: 10.1016/s0168-9002(99)00581-1
• Chubar O, Couprie M-E, Labat M, Lambert G, Polack F, Tcherbakoff O (2008) Time-dependent FEL wavefront propagation calculations: Fourier optics approach. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 593:30–34. doi: 10.1016/j.nima.2008.04.058
• Chubar O, Chu YS, Kaznatcheev K, Yan H (2011) Application of partially coherent wavefront propagation calculations for design of coherence-preserving synchrotron radiation beamlines. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 649:118–122. doi: 10.1016/j.nima.2010.11.134
• Lambert G, Hara T, Garzella D, Tanikawa T, Labat M, Carre B, Kitamura H, Shintake T, Bougeard M, Inoue S, Tanaka Y, Salieres P, Merdji H, Chubar O, Gobert O, Tahara K, Couprie M-E (2008) Injection of harmonics generated in gas in a free-electron laser providing intense and coherent extreme-ultraviolet light. Nature Physics 4:296–300. doi: 10.1038/nphys889
• Bachelard R, Mercère P, Idir M, Couprie M-E, Labat M, Chubar O, Lambert G, Zeitoun P, Kimura H, Ohashi H, Higashiya A, Yabashi M, Nagasono M, Hara T, Ishikawa T (2011) Wavefront Analysis of Nonlinear Self-Amplified Spontaneous-Emission Free-Electron Laser Harmonics in the Single-Shot Regime. Physical Review Letters. doi: 10.1103/physrevlett.106.234801
• Blednykh A, Bacha B, Bassi G, Cheng W, Chubar O, Derbenev A, Lindberg R, Rakitin M, Smaluk V, Zhernenkov M, Chen-Wiegart YK, Wiegart L (2018) New aspects of longitudinal instabilities in electron storage rings. Scientific Reports. doi: 10.1038/s41598-018-30306-y
• Chubar O, Geloni G, Kocharyan V, Madsen A, Saldin E, Serkez S, Shvyd'ko Y, Sutter J (2016) Ultra-high-resolution inelastic X-ray scattering at high-repetition-rate self-seeded X-ray free-electron lasers. Journal of Synchrotron Radiation 23:410–424. doi: 10.1107/s1600577515024844
• Li R, Chubar O (2022) Memory and CPU efficient coherent mode decomposition of partially coherent synchrotron radiation with subtraction of common quadratic phase terms. Optics Express 30:5896. https://doi.org/10.1364/oe.452247
• Chubar O, Williams G, Gao Y, et al (2022) Physical optics simulations for synchrotron radiation sources. Journal of the Optical Society of America A 39:C240. https://doi.org/10.1364/josaa.473367
• Labat M, Chubar O, Breunlin J, et al (2023) Bending Magnet Synchrotron Radiation Imaging with Large Orbital Collection Angles. Physical Review Letters 131:. https://doi.org/10.1103/physrevlett.131.185001
• Chubar O, Berman L, Fluerasu A, et al (2023) Applications of "Synchrotron Radiation Workshop" Code. Synchrotron Radiation News 36:15–22. https://doi.org/10.1080/08940886.2023.2274739
• Goel H, Chubar O, Li R, et al (2024) Efficient end-to-end simulation of time-dependent coherent X-ray scattering experiments. Journal of Synchrotron Radiation 31:517–526. https://doi.org/10.1107/s1600577524001267

Awards & Recognition

2020 Brookhaven National Laboratory Science and Technology Award for Outstanding Achievement.

Tenure scientist in Brookhaven National Laboratory since 2012.