dark side of the light
DESCRIPTION
Dark side of the light. Ing. Karolina Macúchová Supervisor : doc. Ing. J. Zicha, CSc. CERN – experiment OSQAR. Motivation. Dark Matter – Neutrinos, Wimps, Axions?. Search for Axions. Experimental approach: axion coupling with two photons. - PowerPoint PPT PresentationTRANSCRIPT
Konference Studentské tvůrčí činnosti 2013
DARK SIDE OF THE LIGHTIng. Karolina MacúchováSupervisor: 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
Dark Side of the Light
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
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