Fabrice Louche’s personal page

@article{1690,

title = {Three-dimensional modelling and numerical optimisation of the W7-X ICRH antenna},

author = {F. Louche and A. Křivská and A. Messiaen and J. Ongena and V Borsuk and F. Durodié and B Schweer},

url = {http://dx.doi.org/10.1016/j.fusengdes.2015.01.039},

doi = {10.1016/j.fusengdes.2015.01.039},

issn = {09203796},

year  = {2015},

date = {2015-10-01},

journal = {Fusion Engineering and Design},

volume = {96-97},

pages = {508-511},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{1691,

title = {Confirmation of a new concept of ICRF antenna by modelling and experiments},

author = {A. Messiaen and P. Dumortier and F. Louche and M. Vervier},

url = {http://dx.doi.org/10.1016/j.fusengdes.2015.01.032},

doi = {10.1016/j.fusengdes.2015.01.032},

issn = {09203796},

year  = {2015},

date = {2015-10-01},

journal = {Fusion Engineering and Design},

volume = {96-97},

pages = {532-537},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{1604,

title = {Design, performance, and grounding aspects of the International Thermonuclear Experimental Reactor ion cyclotron range of frequencies antenna},

author = {F. Durodié and P. Dumortier and M. Vrancken and A. Messiaen and R Bamber and D Hancock and S Huygen and D Lockley and F. Louche and R Maggiora and D Milanesio and M P S Nightingale and M Shannon and P Tigwell and M. Van Schoor and M. Vervier and D Wilson and K Winkler and team},

url = {http://dx.doi.org/10.1063/1.4884379},

doi = {10.1063/1.4884379},

issn = {1070-664X},

year  = {2014},

date = {2014-06-01},

journal = {Physics of Plasmas (1994-present)},

volume = {21},

number = {6},

pages = {061512+},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{1603,

title = {Study and design of the ion cyclotron resonance heating system for the stellarator Wendelstein 7-X},

author = {J. Ongena and A. Messiaen and D. Van Eester and B Schweer and P. Dumortier and F. Durodié and Y. O. Kazakov and F. Louche and M. Vervier and R. Koch and A. Krivska and A. I. Lyssoivan and M. Van Schoor and T. Wauters and V Borsuk and O Neubauer and O Schmitz and G Offermans and Y Altenburg and C Baylard and D Birus and S Bozhenkov and D A Hartmann and J P Kallmeyer and S Renard and R C Wolf and T Fülöp},

url = {http://dx.doi.org/10.1063/1.4884377},

doi = {10.1063/1.4884377},

issn = {1070-664X},

year  = {2014},

date = {2014-06-01},

journal = {Physics of Plasmas (1994-present)},

volume = {21},

number = {6},

pages = {061514+},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{1590,

title = {Study of the effects of corrugated wall structures due to blanket modules around ICRH antennas},

author = {P. Dumortier and F. Louche and A. Messiaen and M. Vervier},

url = {http://dx.doi.org/10.1063/1.4864562},

doi = {10.1063/1.4864562},

issn = {0094-243X},

year  = {2014},

date = {2014-02-12},

journal = {AIP Conference Proceedings},

volume = {1580},

number = {1},

pages = {358–361},

abstract = {In future fusion reactors, and in ITER, the first wall will be covered by blanket modules. These blanket modules, whose dimensions are of the order of the ICRF wavelengths, together with the clearance gaps between them will constitute a corrugated structure which will interact with the electromagnetic waves launched by ICRF antennas. The conditions in which the grooves constituted by the clearance gaps between the blanket modules can become resonant are studied. Simple analytical models and numerical simulations show that mushroom type structures (with larger gaps at the back than at the front) can bring down the resonance frequencies, which could lead to large voltages in the gaps between the blanket modules and perturb the RF properties of the antenna if they are in the ICRF operating range. The effect on the wave propagation along the wall structure, which is acting as a spatially periodic (toroidally and poloidally) corrugated structure, and hence constitutes a slow wave structure modifying the wall boundary condition, is examined.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{1591,

title = {Performance assessment of the ITER ICRF antenna},

author = {F. Durodié and M. Vrancken and R Bamber and L Colas and P. Dumortier and D Hancock and S Huygen and D Lockley and F. Louche and R Maggiora and D Milanesio and A. Messiaen and M P S Nightingale and M Shannon and P Tigwell and M. Van Schoor and D Wilson and K Winkler and team},

url = {http://dx.doi.org/10.1063/1.4864563},

doi = {10.1063/1.4864563},

issn = {0094-243X},

year  = {2014},

date = {2014-02-12},

journal = {AIP Conference Proceedings},

volume = {1580},

number = {1},

pages = {362–365},

abstract = {ITER's Ion Cyclotron Range of Frequencies (ICRF) system [1] comprises two antenna launchers designed by CYCLE (a consortium of European associations listed in the author affiliations above) on behalf F4E for the ITER Organisation (IO), each inserted as a Port Plug (PP) into one of ITER's Vacuum Vessel (VV) ports. Each launcher is an array of 4 toroidal by 6 poloidal RF current straps specified to couple up to 20 MW in total to the plasma in the frequency range of 40 to 55 MHz but limited to a maximum system voltage of 45 kV and limits on RF electric fields depending on their location and direction with respect to respectively the torus vacuum and the toroidal magnetic field. A crucial aspect of coupling ICRF power to plasmas is the knowledge of the plasma density profiles in the Scrape-Off Layer (SOL) and the location of the RF current straps with respect to the SOL. The launcher layout and details were optimized and its performance estimated for a worst case SOL provided by the IO. The paper summarizes the estimated performance obtained within the operational parameter space specified by IO. Aspects of the RF grounding of the whole antenna PP to the VV port and the effect of the voids between the PP and the Blanket Shielding Modules (BSM) surrounding the antenna front are discussed.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{1589,

title = {Coupling and matching study of the ICRF antenna for W7-X},

author = {A. Messiaen and A. Krivska and F. Louche and J. Ongena and P. Dumortier and F. Durodié and D. Van Eester and M. Vervier},

url = {http://dx.doi.org/10.1063/1.4864561},

doi = {10.1063/1.4864561},

issn = {0094-243X},

year  = {2014},

date = {2014-02-12},

journal = {AIP Conference Proceedings},

volume = {1580},

number = {1},

pages = {354–357},

abstract = {A tight antenna plug consisting in a pair of straps with strong pre-matching covers the first selected frequency band (25-38MHz) for W7-X and provides the toroidal phasings for heating, current drive and wall conditioning. Another plug-in with two short strap triplets is devoted for operation around 76MHz. The antenna coupling to a reference plasma profile is first analyzed by means of the coupling code ANTITER II. It shows the radiation power spectra for the different phasing cases and indicates the problem of the edge power deposition through the Alfven resonance occurring when the operating frequency is lower than the majority cyclotron frequency. Matrices provided by the TOPICA code are used for the matching-decoupling study of the first antenna plug. The large mutual coupling between the 2 straps is counterbalanced by the use of a decoupler. Finally the tunable 5-port junction used to feed in parallel each triplet of the second plug-in is analyzed by means of MWS simulation together with its decoupling-matching system.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{1573,

title = {Ion and electron cyclotron wall conditioning in stellarator and tokamak magnetic field configuration on WEGA},

author = {T. Wauters and H P Laqua and M Otte and M Preynas and T Stange and P Urlings and Y Altenburg and D Aßmus and D Birus and F. Louche},

url = {http://dx.doi.org/10.1063/1.4864519},

doi = {10.1063/1.4864519},

issn = {0094-243X},

year  = {2014},

date = {2014-02-12},

journal = {AIP Conference Proceedings},

volume = {1580},

number = {1},

pages = {187–190},

abstract = {Discharge wall conditioning is an effective tool to improve plasma performance in tokamaks and stellarators. RF Discharge Conditioning (RFDC) techniques are envisaged for use during operational campaigns on superconducting devices like the ITER tokamak and W7-X stellarator, as alternative to DC Glow Discharge Conditioning which is inefficient in presence of magnetic fields. This contribution investigates RFDC in both the ion and electron cyclotron range of frequencies (ICRF and ECRF) on the WEGA device (Max-Planck-Institute for Plasma Physics, Greifswald, Germany) as preparation for W7-X operation. ECRF discharges produced by localised absorption of RF power at EC resonance layers suffer from poor radial discharge homogeneity in the tokamak vacuum magnetic field configuration, severely limiting the plasma wetted wall areas and consequently the conditioning efficiency. The non-localised production of ICRF discharges by collisional RF power absorption features much improved discharge homogeneity making Ion Cyclotron Wall Conditioning (ICWC) the favoured RFDC technique for superconducting tokamaks. RFDC with the stellarator vacuum magnetic field needs to aim at sufficient plasma densities at and outside the last closed flux surface (LCFS), maximising the convective plasma flux along the open field lines to the wall. Whereas for ICRF discharges this condition is easily fulfilled, on WEGA for He-ECRF discharges this could be achieved as well by off axis heating close to the LCFS. In stellarator magnetic field configuration it is found that He-ICWC for wall desaturation is at least one order of magnitude more efficient than He-ECWC. Novel ECWC methods are proposed that can decrease this efficiency gap with ICWC to a factor 2-3. The efficiency difference is less pronounced in case of H 2 -ICWC and ECWC for isotopic exchange.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{1552,

title = {ITER ICRH antenna grounding options},

author = {P. Dumortier and V. Kyrytsya and F. Louche and A. Messiaen and M. Vervier and F. Durodié},

url = {http://dx.doi.org/10.1016/j.fusengdes.2013.01.005},

doi = {10.1016/j.fusengdes.2013.01.005},

issn = {09203796},

year  = {2013},

date = {2013-10-01},

journal = {Fusion Engineering and Design},

volume = {88},

number = {6-8},

pages = {922–925},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{1560,

title = {Design of a mechanically actuated RF grounding system for the ITER ICRH antenna},

author = {D Hancock and Mark Shannon and Bertrand Beaumont and P. Dumortier and F. Durodié and V. Kyrytsya and F. Louche and Robert McKinley and Keith Nicholls},

url = {http://dx.doi.org/10.1016/j.fusengdes.2013.02.089},

doi = {10.1016/j.fusengdes.2013.02.089},

issn = {09203796},

year  = {2013},

date = {2013-10-01},

journal = {Fusion Engineering and Design},

volume = {88},

number = {9-10},

pages = {2100–2104},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{1550,

title = {Status of the ITER Ion Cyclotron H&CD system},

author = {P. U. Lamalle and B Beaumont and F Kazarian and T Gassmann and G Agarici and P Ajesh and T Alonzo and B Arambhadiya and A Argouarch and R Bamber and G Berger-By and J M Bernard and C Brun and S Carpentier and F Clairet and L Colas and X Courtois and A Davis and C Dechelle and L Doceul and P. Dumortier and F. Durodié and F Ferlay and M Firdaouss and E Fredd and J C Giacalone and R Goulding and N Greenough and D. Grine and D Hancock and J V S Hari and J Hillairet and J Hosea and S Huygen and J Jacquinot and J Jacquot and A S Kaye and D Keller and V. Kyrytsya and D Lockley and F. Louche and H Machchhar and E Manon and N Mantel and R Martin and M McCarthy and A. Messiaen and L Meunier and D Milanesio and M Missirlian and K Mohan and A Mukherjee and M Nightingale and D Patadia and A M Patel and G Perrollaz and B Peters and R Pitts and M Porton and K Rajnish and D Rasmussen and D Rathi and R Sanabria and R Sartori and M Shannon and A Simonetto and R Singh and G Suthar and D Swain and P Thomas and P Tigwell and R G Trivedi and M. Vervier and M. Vrancken and D Wilson and K Winkler},

url = {http://dx.doi.org/10.1016/j.fusengdes.2012.11.027},

doi = {10.1016/j.fusengdes.2012.11.027},

issn = {09203796},

year  = {2013},

date = {2013-10-01},

journal = {Fusion Engineering and Design},

volume = {88},

number = {6-8},

pages = {517–520},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{1553,

title = {Influence of the blanket shield modules geometry on the operation of the ITER ICRF antenna},

author = {F. Louche and P. Dumortier and F. Durodié and A. Messiaen},

url = {http://dx.doi.org/10.1016/j.fusengdes.2013.01.011},

doi = {10.1016/j.fusengdes.2013.01.011},

issn = {09203796},

year  = {2013},

date = {2013-10-01},

journal = {Fusion Engineering and Design},

volume = {88},

number = {6-8},

pages = {926–929},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{1554,

title = {RF optimisation of the port plug layout and performance assessment of the ITER ICRF antenna},

author = {M. Vrancken and F. Durodié and R Bamber and N Dalton and P. Dumortier and M Graham and A Horvat and D Hancock and D Lockley and F. Louche and R Maggiora and A. Messiaen and D Milanesio and M P S Nightingale and M Shannon and P Tigwell and M. Van Schoor and D Wilson and K Winkler and Cycle Team},

url = {http://dx.doi.org/10.1016/j.fusengdes.2013.02.162},

doi = {10.1016/j.fusengdes.2013.02.162},

issn = {09203796},

year  = {2013},

date = {2013-10-01},

journal = {Fusion Engineering and Design},

volume = {88},

number = {6-8},

pages = {940–944},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{1452,

title = {Simulation of ITER full-field ICWC scenario in JET: RF physics aspects},

author = {A. I. Lyssoivan and D Douai and R. Koch and J. Ongena and V Philipps and F C Schüller and D. Van Eester and T. Wauters and T Blackman and V Bobkov and S Brezinsek and Cal and F. Durodié and E Gauthier and T Gerbaud and M Graham and S. Jachmich and E Joffrin and A Kreter and V. Kyrytsya and E. Lerche and P Lomas and F. Louche and M Maslov and M L Mayoral and V Moiseenko and I Monakhov and I Pankratov and M. K. Paul and R A Pitts and V Plyusnin and G Sergienko and M Shimada and V L Vdovin and contributors},

url = {http://dx.doi.org/10.1088/0741-3335/54/7/074014},

doi = {10.1088/0741-3335/54/7/074014},

issn = {0741-3335},

year  = {2012},

date = {2012-06-25},

journal = {Plasma Physics and Controlled Fusion},

volume = {54},

number = {7},

pages = {074014+},

keywords = {},

pubstate = {published},

tppubtype = {article}

}