dark side of the light ing. karolina macúchová supervisor: doc. ing. j. zicha, csc. konference...

Konference Studentské tvůrčí činnosti 2013

DARK SIDE OF THE LIGHTIng. Karolina Macúchová

Supervisor: doc. Ing. J. Zicha, CSc.

Dark Side of the Light

Konference Studentské tvůrčí činnosti 2013

CERN – experiment OSQAR

Dark Side of the Light

Konference Studentské tvůrčí činnosti 2013

Motivation

Dark Side of the Light

Dark Energy

73%Luminous Baryonic Matter

1%

Dark Baryonic Matter

3%

Dark Matter23%

Composition of the Universe

Dark Matter – Neutrinos, Wimps, Axions?

Konference Studentské tvůrčí činnosti 2013

Search for Axions

Dark Side of the Light

Experimental approach: axion coupling with two photons

P γ↔ A=1

4 β √ϵg2B2 L2≈const . g2B2L2

Probability of photon – axion conversion in vacuum:

Photon regeneration experiment

Konference Studentské tvůrčí činnosti 2013

Experimental Setup

Dark Side of the Light

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 (H2O)

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

Konference Studentské tvůrčí činnosti 2013

Experimental Setup

Dark Side of the Light

Laser injection

Photon source: Ar+ 4W at 514 nm

LHC magnets: 9T over 14.3 m cooled down to 1.9 K

Konference Studentské tvůrčí činnosti 2013

Adjustment and focusing

Dark Side of the Light

→

Konference Studentské tvůrčí činnosti 2013

Other instrumentation

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Beam dump

Dark chamber – neutral density filters

Konference Studentské tvůrčí činnosti 2013

Laser laboratory

Dark Side of the Light

Plano-concave laser resonator• 1000 mm prototype• He-Ne laser 18mW at 632.8 nm

Konference Studentské tvůrčí činnosti 2013

Outlook

Dark Side of the Light

• Approximately 21 m long resonator for the OSQAR experiment• In vacuum 10-6 mbar

Konference Studentské tvůrčí činnosti 2013Dark Side of the Light

Thank you for your attention.