Biography

 

Research Interests

 

Publication

  • [DOI] Q. Gueuning, C. Craeye, and C. Raucy, “Mutual coupling analysis in non-regular arrays of SKALA antennas with the HARP approach.” 2015.
    [Bibtex] 
    @inproceedings{boreal:162299,
 title = {Mutual coupling analysis in non-regular arrays of SKALA antennas with the HARP approach},
 author = {Gueuning, Quentin and Craeye, Christophe and Raucy, Christopher},
 abstract = {Wideband arrays devoted to radio-astronomy are analyzed. The Macro Basis Functions (MBFs) approach is used and improvements on the interpolatory approach are proposed for the fast interaction between MBFs: application to wire-antennas, DFT approach for the harmonic decomposition and specific to extremely small distances between antennas.},
 language = {Anglais},
 doi = {10.1109/APS.2015.7305153},
 year = {2015},
 url = {http://hdl.handle.net/2078.1/162299}}
  • C. Raucy, F. Andriulli, and C. Craeye, “Stabilization of the modelling of a radio-frequency quadrupole based on quasi-Helmoltz projectors.” 2015.
    [Bibtex] 
    @inproceedings{boreal:162306,
 title = {Stabilization of the modelling of a radio-frequency quadrupole based on quasi-Helmoltz projectors},
 author = {Raucy, Christopher and Andriulli, Francesco and Craeye, Christophe},
 abstract = {This paper presents a stabilization ofa Radio-Frequency Quadrupole simulation based on the quasi-Helmholtz projectors. A boundary element method applied to this case undergoes a low-frequency breakdown i.e the associated system of equations becomes increasingly ill-conditioned fordecreasing frequencies. This in practice implies that the convergence of iterative methods which are used to solve the linear system is poor. This paper reports that a quasi-Helmholtz projectors based stabilization is sucient to handle the level of realismrequired by applications.},
 language = {Anglais},
 year = {2015},
 url = {http://hdl.handle.net/2078.1/162306}}
  • C. Raucy, C. Craeye, and D. Vandeplassche, “Simulation of a radio frequency quadrupole with the Method of Moments.” 2014.
    [Bibtex] 
    @inproceedings{boreal:162286,
 title = {Simulation of a radio frequency quadrupole with the Method of Moments},
 author = {Raucy, Christopher and Craeye, Christophe and Vandeplassche, Dirk},
 abstract = {A Radio Frequency Quadrupole (RFQ) is an essential part of linear accelerator (LINAC). It is situated at the very beginning of the accelerator and has three important functions: focusing, bunching and acceleration. The RFQ prepares the beam before its injection into the strong acceleration cavities and so it impacts the behaviour of the beam in the whole accelerator. Hence, it must be designed as reliable and efficient as possible. At the present time, the simulation of the electromagnetic fields and beam dynamics are carried out with some approximations in order to obtain a reasonable computation time. However, faster and more accurate solvers would first allow us to better understand the RFQ technology for high beam currents and second would potentially allow us to perform some numerical optimization. Our main objective is to develop a fast and accurate solver for the electromagnetic fields and for the beam dynamics. Our laboratory is specialized in fast methods for the electromagnetic fields simulation of antennas. Our solvers are based on the Method of Moments (MoM) in the frequency domain. This method could be applied as well for the electromagnetic fields simulation in accelerating cavities. One of the main advantages of the MoM in comparison to finite elements is that it requires only unknowns on the surface of the cavity. For high beam current, it would be very convenient to be able to calculate simultaneously the equations of motion and the Maxwell’s equations since the fields scattered due to the space charge can be as strong as the source fields. Such a simulation is so-called a self-consistent simulation.},
 language = {Anglais},
 year = {2014},
 url = {http://hdl.handle.net/2078.1/162286}}
  • C. Raucy, E. de Lera Acedo, N. Razavi-Ghods, D. Gonzalez Ovejero, and C. Craeye, “Low-cost near field pattern measurement technique for aperture array characterization.” 2013.
    [Bibtex] 
    @inproceedings{boreal:162304,
 title = {Low-cost near field pattern measurement technique for aperture array characterization},
 author = {Raucy, Christopher and de Lera Acedo, Eloy and Razavi-Ghods, Nima and Gonzalez Ovejero, David and Craeye, Christophe},
 abstract = {This paper describes a low-cost innovative technique to characterize aperture arrays based on a near field pattern measurement. This measurement is used to validate a numerical method code, based on the method of moments, capable of realizing accurate electromagnetic simulations of very large non-regular arrays containing up to thousands of elements which are tens of wavelengths in diameter. A practical application of the technique and the code can be found for low frequency aperture arrays in radio astronomy applications, such as the SKA telescope.},
 language = {Anglais},
 year = {2013},
 url = {http://hdl.handle.net/2078.1/162304}}
  • [DOI] C. Raucy, N. Razzavi Ghods, E. de Lera Acedo, and C. Craeye, “Characterization of SKA-AAlow Antenna elements in the array environment,” in Proceedings of the 2012 International Conference on Electromagnetics in Advanced Applications (ICEAA 2012), 2012.
    [Bibtex] 
    @inproceedings{boreal:125148,
 title = {Characterization of SKA-AAlow Antenna elements in the array environment},
 author = {Raucy, Christopher and Razzavi Ghods, N. and de Lera Acedo, E. and Craeye, Christophe},
 abstract = {The electromagnetic modeling and testing is presented for antenna elements devoted to the low frequency band of the Square Kilometre Array (SKA) telescope [1]. Covering a band from 70 to 450 MHz, these elements consist on a log-periodic dipole array (LPDA) model and they have been designed for maximum sensitivity across the band in the region +/- 45 degrees from zenith. A 16-element array (AAVS0 - Aperture Array Verification System 0) has been built in Lords Bridge, Cambridge, UK, and it is being tested to validate the electromagnetic properties of the antenna elements and front-end. We focus on the modeling of these elements and compare simulated and measured data for simulation software validation.},
 Keywords = {ICTM:ELEN , Antenna arrays , Antenna measurements , Arrays , Impedance , Moment methods},
 language = {Anglais},
 booktitle = {Proceedings of the 2012 International Conference on Electromagnetics in Advanced Applications (ICEAA 2012)},
 doi = {10.1109/ICEAA.2012.6328681},
 publisher = {IEEE},
 year = {2012},
 url = {http://hdl.handle.net/2078.1/125148}}
  • [DOI] C. Raucy, E. De Lera Acedo, C. Craeye, D. Gonzalez Ovejero, and N. Razavi-Ghods, “Experimental validation of fast simulation methods in the framework of the SKA telescope project.” 2012.
    [Bibtex] 
    @inproceedings{boreal:116213,
 title = {Experimental validation of fast simulation methods in the framework of the SKA telescope project},
 author = {Raucy, Christopher and De Lera Acedo, Eloy and Craeye, Christophe and Gonzalez Ovejero, David and Razavi-Ghods, Nima},
 abstract = {The Method of Moments [1] is widely used for the solution of full-wave problems. Recently, a novel technique based on interpolation and Macro Basis Functions (MBFs) [2], [3], has been proposed to reduce the matrix inversion and filling times. The goal of this paper is to present the first steps taken towards the experimental validation of such concept. The validations have been carried out using an irregular array made of ten elements, and built at the University of Cambridge in the framework of the SKA project. Some important practical aspects are presented, such as the feed modelling and the sensitivity of the measurements to the lengths of the transmission lines feeding the antennas. The good agreement between measurements and simulations and the future perspectives are discussed in the final sections of the paper.},
 language = {Anglais},
 doi = {10.1109/EuCAP.2012.6206623},
 year = {2012},
 url = {http://hdl.handle.net/2078/116213}}
  • [DOI] E. De Lera Acedo, N. Razavi-Ghods, P. Scott, P. Doherty, K. Grainge, A. Faulkner, P. Alexander, N. Drought, N. Troop, D. Gonzalez Ovejero, C. Raucy, C. Craeye, P. Van Der Merwe, and H. C. Reader, “SKA AA-low front-end developments (At Cambridge University).” 2012.
    [Bibtex] 
    @inproceedings{boreal:116212,
 title = {SKA AA-low front-end developments (At Cambridge University)},
 author = {De Lera Acedo, Eloy and Razavi-Ghods, Nima and Scott, Paul and Doherty, Peter and Grainge, Keith and Faulkner, Andrew and Alexander, Paul and Drought, Nick and Troop, Nick and Gonzalez Ovejero, David and Raucy, Christopher and Craeye, Christophe and Van Der Merwe, Paul and Reader, Howard C.},
 abstract = {This paper briefly summarizes the on-going work at the University of Cambridge to design a suitable front-end for the SKA AA-low array (Phase I of SKA, 70-450 MHz). This is a collaborative effort between different institutions and comprises of the design and development of a low cost ultra-wideband antenna and a low noise amplifier to meet the ambitious SKA specifications. These components have been tested as single elements and will be further validated as part of a 16-element array called AAVS0 (Aperture Array Verification System 0).},
 language = {Anglais},
 doi = {10.1109/EuCAP.2012.6206593},
 year = {2012},
 url = {http://hdl.handle.net/2078/116212}}

Contact

Email : christopher.raucy@uclouvain.be
Phone : +32 10 47