, counterrotating disks in low-temperature helium gas, Europhys. Lett, vol.26, p.31, 1994.

T. Bramwell, P. C. Holdsworth, and J. Pinton, Universality of rare fluctuations in turbulence and critical phenomena, Nature, vol.46, issue.6711, 1998.
DOI : 10.1016/0167-2789(90)90035-N

-. Pinton, P. C. Holdsworth, and R. Labbé, Power fluctuations in a closed turbulent shear flow, Physical Review E, vol.18, issue.3, 1999.
DOI : 10.1088/0022-3719/18/28/006

-. Titon and O. Cadot, The statistics of power injected in a closed turbulent flow: Constant torque forcing versus constant velocity forcing, Physics of Fluids, vol.4, issue.3, 2003.
DOI : 10.1016/0169-5983(91)90026-F

-. Titon and O. Cadot, Global injected power statistics in a turbulent system: degrees of freedom and aspect ratio effect, The European Physical Journal B, vol.477, issue.3, 2005.
DOI : 10.1038/25083

H. Kraichnan, Inertial Ranges in Two-Dimensional Turbulence, Physics of Fluids, vol.10, issue.7, 14171967.
DOI : 10.1063/1.1762301

. Castaing, The Temperature of Turbulent Flows, Journal de Physique II, vol.6, issue.1, 1996.
DOI : 10.1051/jp2:1996172

URL : https://hal.archives-ouvertes.fr/jpa-00248278

N. Ciliberto, S. Garnier, C. Hernandez, J. Lacpatia, G. R. Pinton et al., Experimental test of the Gallavotti???Cohen fluctuation theorem in turbulent flows, Physica A: Statistical Mechanics and its Applications, vol.340, issue.1-3, 2004.
DOI : 10.1016/j.physa.2004.04.013

URL : https://hal.archives-ouvertes.fr/hal-00005007

P. Monchaux, P. Cortet, A. Chavanis, F. Chiffaudel, P. Daviaud et al., Fluctuation-Dissipation Relations and Statistical Temperatures in a Turbulent von K??rm??n Flow, Physical Review Letters, vol.6, issue.17, 2008.
DOI : 10.1017/S0022112008000712

D. Gilbert, Spiral structures and spectra in two-dimensional turbulence, Journal of Fluid Mechanics, vol.50, issue.-1, p.475, 1988.
DOI : 10.1017/S0022112083001822

C. Vassilicos, Anomalous diffusion of isolated flow singularities and of fractal or spiral structures, Physical Review E, vol.52, issue.6, 1995.
DOI : 10.1007/978-1-4615-8570-1

S. Cadot, Y. Douady, and . Couder, Characterization of the lowpressure filaments in a three-dimensional turbulent shear flow, Phys. Fluids, vol.7, issue.630, 1995.

J. Labbé, S. Pinton, and . Fauve, Study of the von K??rm??n flow between coaxial corotating disks, Physics of Fluids, vol.8, issue.4, 1996.
DOI : 10.1063/1.868593

J. Mordant, F. Pinton, and . Chillà, Characterization of Turbulence in a Closed Flow, Journal de Physique II, vol.7, issue.11, 17291997.
DOI : 10.1051/jp2:1997212

URL : https://hal.archives-ouvertes.fr/jpa-00248545

L. Ravelet, A. Marié, F. Chiffaudel, and . Daviaud, Multistability and Memory Effect in a Highly Turbulent Flow: Experimental Evidence for a Global Bifurcation, Physical Review Letters, vol.309, issue.16, 2004.
DOI : 10.1063/1.1373686

URL : https://hal.archives-ouvertes.fr/hal-00002925

F. Nore, L. Moisy, and . Quartier, Experimental observation of nearheteroclinic cycles in the von Kármán swirling flow, Phys. Fluids, vol.17, 2005.

G. Tabeling, F. Zocchi, J. Belin, H. Maurer, and . Willaime, Probability density functions, skewness, and flatness in large Reynolds number turbulence, Physical Review E, vol.73, issue.2, 16131996.
DOI : 10.1103/PhysRevLett.73.3227

C. Arneodo, F. Baudet, R. Belin, B. Benzi, B. Castaing et al., various flow configurations, 1996.

. Marié, Transport de moment cinétique et de champ magnétique par un écoulement tourbillonaire turbulent: Influence de la rotation, 2003.

F. Marié and . Daviaud, Experimental measurement of the scale-byscale momentum transport budget in a turbulent shear flow, Phys. Fluids, vol.16, issue.457, 2004.

J. Laval, P. Blaineau, N. Leprovost, B. Dubrulle, and F. Daviaud, Influence of Turbulence on the Dynamo Threshold, Physical Review Letters, vol.38, issue.20, 2006.
DOI : 10.1063/1.1404383

URL : https://hal.archives-ouvertes.fr/hal-00016684

J. Aumaître, S. Farago, S. Fauve, and . Mc-namara, Energy and power fluctuations in vibrated granular gases, Eur. Phys. J. B, vol.42, issue.255, 2004.

A. Aumaître, S. Alastuey, and . Fauve, A quasi-elastic regime for vibrated granular gases, The European Physical Journal B, vol.88, issue.2, 2006.
DOI : 10.1140/epjb/e2006-00447-7

, 27 These impellers have been historically designed for efficient dynamo action in the VKS experiment held in CEA-Cadarache. Impellers TM60 were designed, studied Ref. 44, and tested in a first sodium experimental setup, called VKS1, during years This setup did not succeed in producing dynamo action. Further optimization process led to TM73 impellers design Refs. 28 and 33 and to a new experimental setup VKS2, this system, successful dynamo action has been achieved, p.39, 2000.

A. Ravelet, F. Chiffaudel, J. Daviaud, and . Leorat, Toward an experimental von K??rm??n dynamo: Numerical studies for an optimized design, Physics of Fluids, vol.162, issue.11, 2005.
DOI : 10.1063/1.1739401

A. Ravelet, F. Chiffaudel, and . Daviaud, Supercritical transition to turbulence in an inertially driven von K??rm??n closed flow, Journal of Fluid Mechanics, vol.356, issue.339, 2008.
DOI : 10.1017/S0022112068000054

P. C. Portelli, J. Holdsworth, and . Pinton, Intermittency and Non-Gaussian Fluctuations of the Global Energy Transfer in Fully Developed Turbulence, Physical Review Letters, vol.34, issue.10, 2003.
DOI : 10.1103/PhysRevLett.89.254502

URL : https://hal.archives-ouvertes.fr/hal-00134666

S. Aumaître, S. Fauve, P. Mc-namara, and . Poggi, Power injected in dissipative systems and the fluctuation theorem, The European Physical Journal B, vol.19, issue.3, 2001.
DOI : 10.1007/s100510170321

F. Monchaux, B. Ravelet, A. Dubrulle, F. Chiffaudel, and . Daviaud, Properties of Steady States in Turbulent Axisymmetric Flows, Physical Review Letters, vol.229, issue.12, 2006.
DOI : 10.1103/PhysRevLett.93.164501

URL : https://hal.archives-ouvertes.fr/hal-00163811

. Monchaux, Mécanique statistique et effet dynamo dans un écoulement de von Kármán turbulent, 2007.

O. L. Cadot and . Maitre, The turbulent flow between two rotating stirrers: similarity laws and transitions for the driving torques fluctuations, European Journal of Mechanics - B/Fluids, vol.26, issue.2, 2007.
DOI : 10.1016/j.euromechflu.2006.05.004

, 35 Careful analysis of the critical regimes by torque measurements, to be reported elsewhere, has been performed with the annulus In a very narrow range 0.171 0.179, we observe very slow dynamical regimes where the topology changes back and forth along time over hours. This explains why, very close to c , some of the present measurements?acquired for only 10 min?may not appear to be of the expected topology in Fig

, 36 If regions of high level of turbulence due to shear still exist, they should be confined inside the blades of the slow rotating impeller

O. Gailitis, E. Lielausis, S. Platacis, A. Dement-'ev, G. Cifersons et al., Magnetic Field Saturation in the Riga Dynamo Experiment, Physical Review Letters, vol.32, issue.14, 2001.
DOI : 10.1007/s001140050746

U. Stieglitz and . Müller, Experimental demonstration of a homogeneous two-scale dynamo, Physics of Fluids, vol.19, issue.3, 2001.
DOI : 10.1103/PhysRevE.61.5287

M. Monchaux, M. Berhanu, M. Bourgoin, . Moulin, . Ph et al., Generation of a Magnetic Field by Dynamo Action in a Turbulent Flow of Liquid Sodium, Physical Review Letters, vol.13, issue.4, 2007.
DOI : 10.1038/219717a0

URL : https://hal.archives-ouvertes.fr/hal-00492342

R. Berhanu, S. Monchaux, N. Fauve, F. Mordant, A. Petrelis et al.,

J. Odier, R. Pinton, and . Volk, Magnetic field reversals in an experimental turbulent dynamo, Europhys. Lett, vol.77, issue.59001, 2007.
URL : https://hal.archives-ouvertes.fr/hal-00492334

B. Leprovost and . Dubrulle, The turbulent dynamo as an instability in a noisy medium, The European Physical Journal B, vol.37, issue.3, 2005.
DOI : 10.1140/epjb/e2005-00138-y

URL : https://hal.archives-ouvertes.fr/hal-00001417

S. Pétrélis and . Fauve, Inhibition of the dynamo effect by phase fluctuations, Europhys. Lett, vol.76, issue.602, 2006.

P. Dubrulle, O. Blaineau, F. Mafra-lopes, J. Daviaud, R. Laval et al., Bifurcations and dynamo action in a Taylor???Green flow, New Journal of Physics, vol.9, issue.8, 2007.
DOI : 10.1088/1367-2630/9/8/308

URL : https://hal.archives-ouvertes.fr/hal-00169459

J. Marié, F. Burguete, J. Daviaud, and . Léorat, Numerical study of homogeneous dynamo based on experimental von Kármán type flows, Eur. Phys. J. B, vol.33, issue.469, 2003.

L. Bourgoin, F. Marié, C. Pétrélis, A. Gasquet, J. Guigon et al., MHD measurements in the von Kármán sodium experiment, Normalized kinetic energy Phys. Fluids, pp.2002-025104, 2009.
DOI : 10.1063/1.1497376