1. DARK SIDE OF THE LIGHT Ing. Karolina Macúchová Supervisor: doc. Ing. J. Zicha, CSc. Konference Studentské tvůrčí činnosti 2013Dark Side of the Light

2. CERN – experiment OSQAR Konference Studentské tvůrčí činnosti 2013Dark Side of the Light

3. Motivation Dark Side of the LightKonference Studentské tvůrčí činnosti 2013 Dark Matter – Neutrinos, Wimps, Axions?

4. Search for Axions Dark Side of the LightKonference Studentské tvůrčí činnosti 2013 Experimental approach: axion coupling with two photons Probability of photon – axion conversion in vacuum: Photon regeneration experiment

5. Experimental Setup Dark Side of the LightKonference Studentské tvůrčí činnosti 2013 1. laser 2. a, b – adjustable mirrors for beam 3. beam expander 4. first LHC magnet 5. light trap 6. optical filters 7. second LHC magnet 8. dark chamber 9. CCD camera 10. data acquisition - PC 11. cooling (H 2 O) 12. cooling (liquid Helium, T = 1.9 K) 13. vacuum pump (p = 10 -6 - 10 -7 mbar) 14. vacuum pump 15. cooling (LN2) 16. laser beam 17. Laser cavity

6. Experimental Setup Dark Side of the LightKonference Studentské tvůrčí činnosti 2013 Laser injection Photon source: Ar + 4W at 514 nm LHC magnets: 9T over 14.3 m cooled down to 1.9 K

7. Adjustment and focusing Dark Side of the LightKonference Studentské tvůrčí činnosti 2013 →

8. Other instrumentation Dark Side of the LightKonference Studentské tvůrčí činnosti 2013 Beam dump Dark chamber – neutral density filters

9. Laser laboratory Dark Side of the LightKonference Studentské tvůrčí činnosti 2013 Plano-concave laser resonator 1000 mm prototype He-Ne laser 18mW at 632.8 nm

10. Outlook Dark Side of the LightKonference Studentské tvůrčí činnosti 2013 Approximately 21 m long resonator for the OSQAR experiment In vacuum 10 -6 mbar

11. Dark Side of the LightKonference Studentské tvůrčí činnosti 2013 Thank you for your attention.