Research Interests

• Computational physics.
• Satellite and satellite instruments interaction with space environment.
• Space plasmas.
• Earth magnetosphere and solar wind interaction with Earth environment.
• Finite element modelling, automatic generation of structured and unstructured meshes, visualization.
• Thermonuclear fusion and magnetic confinement.

Selected Publications

• Surface charge and surface current densities at material boundaries,
  SM Brask, S Marholm, WJ Miloch, R Marchand, Journal of Plasma Physics https://doi.org/10.1017/S0022377823001411 (2024).
  
• Surface charge and surface current densities at material boundaries,
  R. Marchand, American Journal of Physics, American J. Physics 92/2 https://doi.org/10.1119/5.0164442 (2024).
  Preprint available here.
• Radio Instrument Package for Lunar Ionospheric Observation: A Concept Study
  C. Watson, P. T. Jayachandran, A. Kashcheyev, D. R. Themens, R. B. Langley, R. Marchand, and A. W. Yau, Radio Science, https://doi.org/10.1029/2023RS007666 (2023).
• Beyond analytic approximations with machine learning inference of plasma parameters and confidence intervals
  R Marchand, S Shahsavani, G Sanchez-Arriaga, Journal of Plasma Physics, https://doi.org/10.1017/S0022377823000041 (2023).
• m-NLP inference models using simulation and regression techniques
  G Liu, S Marholm, A J Eklund, L Clausen, R Marchand, Journal of Geophysical Research - Space Physics, http://dx.doi.org/10.1029/2022JA030835 (2023).
• A New Technique to Infer Plasma Density, Flow Velocity, and Satellite Potential From Ion Currents Collected by a Segmented Langmuir Probe
  A Olowookere, R Marchand, IEEE Trans. Plasma Science, 50/10, pp. 3774-3786 DOI: 10.1109/TPS.2022.3205868 (2022).
• Inference of m-NLP data using radial basis function regression with center-evolving algorithm
  G Liu, R Marchand, Computer Physics Communication, 280:108497, https://doi.org/10.1016/j.cpc.2022.108497.
• Effect of magnetic connectivity on CubeSat needle probe measurement
  N Imtiaz, R Marchand, H Rizvi, Astrophysics and Space Science, 367:49, https://doi.org/10.1007/s10509-022-04078-x (2022).
• Density-temperature constraint from fixed-bias spherical Langmuir probes
  A Olowookere, R Marchand, IEEE Trans. Plasma Science, 49/6, pp. 1997-1999, DOI: 10.1109/TPS.2021.3076806 (2021).
• Kinetic Simulation of Segmented Plasma Flow Meter Response in the Ionospheric Plasma
  G Liu, R Marchand, Journal of Geophysical Research: Space Physics, DOI: 10.1029/2021JA029120 (2021).
• Inference of plasma parameters from fixed-bias multi-needle Langmuir probes (m-NLP)
  Guthrie J, Marchand R, Marholm S, Measurement Science and Technology, DOI: https://doi.org/10.1088/1361-6501/abf804 (2021).
• Fixed Bias Probe Measurement of a Satellite Floating Potential
  Olowookere A, Marchand R, IEEE Trans. Plasma Science, 49/2, pp 862-870, DOI : 10.1109/TPS.2020.3045366 (2021).
• Simulation inference of plasma parameters from Langmuir probe measurements
  Resendiz Lira PA, Marchand R, J. Geophysical Research, http://doi.org/10.1029/2020EA001344
• A Novel Method for Circuits of Perfect Electric Conductors in Unstructured Particle In Cell Plasma Object Interaction Simulations
  Marholm S, Darian D, Mortensen, Marchand, Miloch WJ, IEEE Trans. Plasma Science, 48/8, pp. 2856-2872, DOI 10.1109/TPS.2020.3010561 (2020).
• Finite-length effects on cylindrical Langmuir probes
  Marholm S, Marchand R, Physical Review Research 2, DOI:10.1103/PhysRevResearch.2.023016, (2020)
• Self-force subtraction in particle in cell simulations
  Resendiz Lira P A, Marchand R, Computer Phys. Comm., https://doi.org/10.1016/j.cpc.2020.107212, (2020)
• Impact of Miniaturized Fixed-Bias Multi-Needle Langmuir Probes on CubeSats
  Marholm S, Marchand R, Darian D, Miloch W, Mortensen M, IEEE Trans. Plasma Science, DOI: 10.1109/TPS.2019.2915810, (2019).
• Determination of Swarm front plate's effective cross section from kinetic simulations
  Resendiz Lira P A, Marchand R, Burchill J, Förster M, IEEE Trans. Plasma Science, DOI: 10.1109/TPS.2019.2915216, (2019).
• A First Assessment of a Regression-Based Interpretation of Langmuir Probe Measurements
  Chalaturnyk J, Marchand R, Front. Physics, 3 May 2019 https://doi.org/10.3389/fphy.2019.00063
• Tethered capacitor charge mitigation in electron beam experiments
  Marchand R, Delzanno JL, Front. Astron. Space Sci., 13 December 2018 https://doi.org/10.3389/fspas.2018.00042
• Sunlight Illumination Models for Spacecraft Surface Charging
  S. Grey, R. Marchand, M. Ziebart, and R. Omar, IEEE Trans. Plasma Sci., 45/8, pp. 1898-1905 (2017).
• Kinetic Simulation of Spacecraft-Environment Inteaction
  R. Marchand and P.A. Resendiz Lira, IEEE Trans. Plasma Sci., 45/4, pp 535-554, DOI: 10.1109/TPS.2017.2682229 (2017).
• Kinetic modeling of Langmuir probe characteristics in a laboratory plasma near a conducting body
  S. ur Rehman, L. E. Fisher, K. A. Lynch, and R. Marchand, Phys. Plasmas, 44 DOI: 10.1063/1.4972879 (2017).
  A copy of the accepted manuscript is available here.
• Ionospheric Langmuir Probe Electron Temperature Asymmetry and Magnetic Field Connectivity
  R. Marchand, IEEE Trans. Plasma Sci., 2016.
• Using Orbital Tethers to Remediate Geomagnetic Radiation Belts
  M Hudoba de Badyn, R. Marchand, R.D. Sydora
Journal of Geophysical Research: Space Physics, DOI: 10.1002/2015JA021715 (2016)
• PIC modeling of Dual Segmented Langmuir Probe on PROBA 2
  N. Imtiaz and R. Marchand Astrophys. and Space Sci. 360/1, pp 1-8 (2015)
• Aberrations in particle distribution functions near e-POP particle sensors
  R. Marchand and S. Hussain, IEEE Trans. Plasma Sci., 43/9, pp 2776-2781 (2015)
• Properties of the lunar wake predicted by analytic models and hybrid-kinetic simulations
  H. Gharaee, R. Rankin, R. Marchand and J. Paral, J. Geophys. Res., pp 2169-9402 (2015).
• Plasma-satellite interaction driven magnetic field perturbations
  S. ur Rehman and R. Marchand, Phys. Plasmas, 21/7, DOI: 10.1063/1.4894678 (2014).
  
• Sheath-induced distorsions in particle distributions near enhanced polar outflow probe particle sensors
  S. Hussain and R. Marchand, Phys. Plasmas, 21/7, 072902PHP (2014).
  
• Cross-comparison of spacecraft-environment interaction model predictions applied to Solar Probe Plus near perihelion
  R. Marchand, Y. Miyake, H. Usui, J. Deca, G. Lapenta, J.C. Matéo-Vélez, R.E. Ergun, A. Sturner, V. Génot, A. Hilgers and S. Markidis, Phys. Plasmas, 21/6, 064406PHP (2014).
  
• Spacecraft charging analysis with the implicit particle-in-cell code iPic3D
  J. Deca, G. Lapenta, R. Marchand and S. Markidis, Phys. Plasmas 20, 102902 (2013).
• Earth magnetic field effects on particle sensors on LEO Satellites
  S. ur Rehman, R. Marchand, J.-J. Berthelier, T. Onishi and J. Burchill, IEEE Trans. Plasma Sci., 41(12), pp. 3402-3409 (2013) doi 10.1109/TPS.2013.2262715.
• Modeling of current characteristics of segmented Langmuir probe on DEMETER
  N. Imtiaz, R. Marchand and J.-P. Lebreton, Physics of Plasmas, Vol. 20 Issue 5, p052903. 8p. DOI: 10.1063/1.4804336 (2013).
• LEOrbit a program to calculate parameters relevant to modelling Low Earth Orbit spacecraftplasma interaction
  R. Marchand, D. Purschke and J. Samson, Computer Phys. Comm., 184, pp. 866-872 (2013).
• Earth Magnetic Field Effects on Swarm Electric Field Instrument
  S. Rehman, J. Burchill, A. Eriksson and R. Marchand, Planetary and Space Science, 73, pp. 145-50 (2012).
• Comparative study of forward and backward test-kinetic simulation approaches
  G. Voitcu, M. Echim and R. Marchand, Comp. Phys. Comm., 183, 2561-69 (2012), http://dx.doi.org/10.1016/j.bbr.2011.03.031
• PTetra, a tool to simulate low orbit satellite-plasma interaction
  R. Marchand, IEEE Trans. Plasma Science, 40, 217-229 (2012), DOI: 10.1109/TPS.2011.2172638.
• Modeling of ionospheric magnetic field perturbations induced by earthquakes
  N. Imtiaz and R. Marchand, J. Geophys. Res., doi:10.1029/2011JA017475, (2012).
• Modelling Electrostatic Sheath Effects on Swarm Electric Field Instrument Measurements
  R. Marchand, J.K. Burchill and D.J. Knudsen, Space Science Rev., 156, DOI: 10.1007/s11214-010-9735-y
• Sheath Effects on DEMETER ion drift measurements
  R. Marchand N. Knutson and J.J. Berthelier, Planetary and Space Science, 58, 1365-73 (2010). http://dx.doi.org/10.1016/j.pss.2010.05.021
• Test-particle simulation of space plasmas
  R. Marchand, Commun. Comput. Phys., 8, 471-83 (2010).
• Simple model for post seismic ionospheric disturbances above an earthquake epicentre and along connecting magnetic field lines
  R. Marchand and J.J. Berthelier, Nat. Hazards Earth Syst. Sci., 8, 1341-47 (2008).
• Mode trapping near the plasmapause
  H. Turkakin, R. Marchand, Z.C. Kale, J. Geophys. Res., 113, A11210, doi:10.1029/2008JA013045.
• Consistency check of a global MHD simulation using the test-kinetic approach
  R. Marchand, F. Mackay, J. Y. Lu and K. Kabin, Plasma Phys. Cont. Fusion 50, 074007 (2008).
• Electromagnetic waves generated by ionospheric feedback instability
  J Y Lu, W Wang, RW Rankin, R Marchand, J Lei, S C Solomon, I J Rae, J S Wang and G M Le, J. Geoph. Res. 113 A05206, doi:10.1029/2007JA012659 (2008).
• Test-kinetic modelling of collisionless perpendicular shocks
  F. Mackay, R. Marchand, and K. Kabin, J. Plasma Physics 74, pp 301-18 (2008).
• Electrodynamics of magnetosphere-ionosphere coupling and feedback on magnetospheric field line resonances J Y Lu, RW Rankin, R Marchand, I J Rae, W Wang, S C Solomon and J Lei J. Geoph. Res. 112, A10219, doi:10.1029/2006JA012195 (2007).
• Divergence-free magnetic field interpolation and charged particle trajectory integration
  Mackay, F, R Marchand, K Kabin., J. Geophys. Res. 111 (2006) A06205, doi:10.1029/2005JA011382.
• Unstructured Meshes and Finite Elements in Space Plasma Modelling
  Marchand R, J.Y. Lu, K. Kabin and R. Rankin, Advanced Methods for Space Simulations, Editors H Usui and Y Omura. TERRAPUB (2007).
• Spatiotemporal characteristics of ultra-low frequency dispersive scale shear Alfven waves in Earth's magnetosphere
  Rankin, R., J.Y. Lu, R. Marchand, and E.F. Donovan, Phys. Plasmas., 11(4), 1268, doi:10.1063/1.1647138, 2004.
• Dynamic response of Earth's magnetosphere to B_y reversals
  K. Kabin, R. Rankin, R. Marchand, T.I. Gombosi, C.R. Clauer, A.J. Ridley, V.O. Papitashvili and D.L. DeZeeuw, J. Geophys. Res. 108 (2003) A3, SMP 19-1.
• Finite element modelling of transport in a tokamak edge and divertor.
  R. Marchand, Plasma Physics and Controlled Fusion, 44 (2002), pp. 871-882.
  A preprint is available in pdf format.
• Aranea, a program for generating unstructured triangular meshes with a Java Graphics User Interface.
  R. Marchand, M. Charbonneau-Lefort, M. Dumberry and B. Pronovost, Comp. Phys. Comm. , pp 172-185 (2001).
• Numerical simulation of the excitation and evolution of high azimuthal mode number coherent vortices in hollow magnetized electron columns.
  R. Marchand and M. Shoucri, J. Plasma Phys. 65, part 2, pp. 151-160 (2001).
• Local effects of upstream divertor components on divertor plasma parameters and impurity retention forces
  F. Meo, B.L. Stansfield, G. Abel, E. Haddad, R. Marchand, G. Ratel, J.D. Elder and X. Bonnin, Phys. Of Plasmas 7, 2494 (2000).
• Interpretation of the impurity distribution in the divertor during divertor plate biasing using the DIVIMP code
  E. Haddad, F. Meo, R. Marchand, et al., Nucl. Mat. 278, 111 (2000).
• Spectroscopic imaging system for quantitative analysis of the divertor plasma of Tokamak de Varennes
  F. Meo, B.L. Stansfield, M. Chartré, P. de Villers, R. Marchand and G. Ratel, Rev. Sci. Instrum. 68, 3426 (1997).
• Finite element modelling of TdeV edge and divertor with E×B drifts
  R. Marchand and M. Simard, Nucl. Fusion 37, 1629 (1997).
• Divertor Detachment and Exhaust on the TdeV TOKAMAK
  R. Décoste, et al., (including R. Marchand), Plasma Phys. Control. Fusion 38 supp., 121 (1996).
• CARRE: A quasi-orthogonal mesh generator for modelling tokamak edge plasmas
  R. Marchand and M. Dumberry, Computer Phys. Comm. 96, 232 (1996).
• Up-down symmetry in double null divertor experiments and magnetic field topology
  R. Marchand, M. Dumberry, Y. Demers, C. Côté, G. LeClair, J.M. Larsen, X. Bonnin, B.J. Braams, Nucl. Fusion 35(3), 297-304 (1995).
• Characterization and control of the power loss and its distribution in TdeV during divertor plate biasing experiments
  A. Sarkissian, T. Fall, R. Marchand, N. Richard, J. Mailloux, R. Décoste, B.C. Gregory, B.L. Stansfield, B. Terreault, W.W. Zuzak, C. Boucher, A. Côté, J. Gunn, H.Y. Guo, J.L. Lachambre, F. Méo, Nucl. Fusion, 35, 641 (1995).

Teaching

• PHYS 695 Introduction to space environment and space weather (in videoconference, with three other instructors).
• PHYS 234 Introduction to Computational Physics.
• PHYS 372 Quantum Mechanics A.
• PHYS 381 Electromagnetic Theory I.
• ASTRO 429 Upper atmosphere and space physics.
• PHYS 520 Classical Electrodynamics I.
• PHYS 524 Advanced Electrodynamics.
• PHYS 530 Statistical Mechanics.
• PHYS 420-580 Advanced Topics in Computational Physics.
• PHYS 601 Satellite orbits and missions.