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The BMV project : axion search with a pulsed magnet Status of the experiment

The BMV project : axion search with a pulsed magnet Status of the experiment. Rémy Battesti. L aboratoire N ational des C hamps M agnétiques P ulsés Université Paul Sabatier, CNRS Toulouse, France. The B iréfringence M agnétique du V ide project.

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The BMV project : axion search with a pulsed magnet Status of the experiment

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  1. The BMV project : axion searchwith a pulsed magnetStatus of the experiment Rémy Battesti Laboratoire National des Champs Magnétiques Pulsés Université Paul Sabatier, CNRS Toulouse, France

  2. The Biréfringence Magnétique du Vide project Laboratoire des Collisions Agrégatset Réactivité, Toulouse : B. Pinto da Souza (Ph-D student), C. Robilliard, J. Vigué, C. Rizzo. Laboratoire National des Champs Magnétiques Pulsés, Toulouse : S. Batut (Ph-D student), R. Battesti, O. Portugall, G. Rikken Laboratoire des Matériaux Avancés -VIRGO, Lyon : P. Ganau, A. Remillieux, C. Michel, L. Pinard, J-M. Mackowski. Astrophysical consequences Centre d’Etudes Spatiales du Rayonnement, Toulouse : G.F. Bignami, JF Olive

  3. Principle of the experiment Cavitymirrors (T~5-10 ppm) Photodiode B0 laser Analysing prism Polarising prism Pulsed magnet

  4. Experimental Challenge QED Vacuum ellipticity : Relevant parameters : F = Finesse of the Optical Cavity L = Length of the Magnet l= Laser Wavelength B = Magnetic Field and Ys = Sensitivity Reference experiment : PVLAS (arXiv:hep-ex/0507107) • B²L = 25 T²m • F = 70 000 • modulation frequency 0.6 Hz • Ψs = 10-7 1/Hz1/2

  5. The pulsed magnet

  6. Magnetic field labs in Europe

  7. One of the highest field in the world Generator 24 kV,14 MJ 65 kA current limitation 77,3 T

  8. B(mT) B(mT) 1.2 B2 B1 1.0 B 0.8 0.6 0.4 0.2 0.0 -0.2 -0.1 0.0 0.1 0.2 z(m) Design of the pulsed magnet : X-coil Transverse magnetic field Goal : B²L > 30 T²m B²L/I² = 2,5×10-7 T²m/A² I  I X coil geometry

  9. Magnet prototype 25 cm G10 • copper wire • cool at liquid nitrogen temperature • cost ~ 1 000 €

  10. X coil Winding (5 hours) Test at liquid nitrogen temperature

  11. Last results Imax = 8 300 A Vmax= 3 700 V Bmax = 14,3 T B²Lmax = 28 T²m

  12. The cavity mirrors

  13. Class 10 Class 100 Class 1 Class 10 Clean environments for our VIRGO mirrors Class 1 mounting the mirrors in barrels Class 10 inserting the mirror in the chamber Class 100 for the people to stand (fully equipped) (= 1 particle > 0.3 mm per ft3 )

  14. Miroirs après Montage et Démontage sur la cavité réalisé en Novembre 2005 great improvement !

  15. Clean room at LNCMP Set-up starting February 06

  16. Cavity set-up 2 m analyzer Xcoil+ cryostat Xcoil+ cryostat mirror 50 cm 2 m 90 polarizer mirror

  17. Sensitivity

  18. YS sensitivity Realistic estimation (with PVLAS results) Ellipticity modulated at frequency 2nb > 100 Hz ellipticity time (ms) PVLAS We can reasonably expect BMV Shot noise YS ~ 10-9 1/√Hz Ph-D thesis G. Ruoso

  19. Conclusion Magnet is ready Mirrors of the cavity have been tested Our sensitivity is sufficient Goal for 2006 : Build the experiment and take the first datas • B²L = 30 T²m • finesse = 200 000 • Ψs = 10-8 /Hz1/2 Parameters :

  20. Conclusion Goal for 2007 : Brookhaven, 1993 BMV Ma (GeV) ma (eV)

  21. Perspectives • 25 T over 1.5 m • 1 000 000 finesse QED effect Feasability study for Mega Gauss generator at LNCMP destructive coil : 300 T over 10 cm photoregeneration experiment Astrophysical observations : GLAST telescope 2007 PRL 94, 161101, 2005 and PRL 95, 211302,2005

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