visual
visual

세미나

  • HOME
  • >
  • 소식
  • >
  • 세미나
날짜 2015-10-16 15:00 
일시 2015/10/16, 3PM 
장소 E6-2, 5th fl. #5318 
연사 Dr. Pierre Pugnat , (CNRS-LNCMI) 

High Magnetic Fields to Probe the sub-eV range of Particle/Astroparticle Physics - From the OSQAR experiments at CERN up to new perspectives at LNCMI-Grenoble

2015/10/16(Fri) 3PM, E6-2, (RM)#5318
Dr. Pierre Pugnat , CNRS-
LNCMI  

This seminar will be split in 2 parts. In the first one, the different set-ups, overall results and near future plans of the OSQAR experiments at CERN will be presented after a short reminder highlighting the scientific interests 

of exploring the low, i.e. sub-eV, energy frontier of particle physics. 

In the beginning, OSQAR mostly aimed at measuring the Vacuum Magnetic Birefringence (VMB), which was first predicted by Euler, Heisenberg and Weisskopf in 1936 

and later formally confirmed by Quantum Electrodynamics. 
First steps in the development of a high sensitive ellipsometer for OSQAR-VMB will be briefly presented together with results obtained in measuring the Cotton-Mouton effect 

in Nitrogen gas as a function of pressure. 

The second objective of OSQAR is to search for axions and Axion-Like Particles (ALPS) of sub-eV energy from a "Light Shining through a Wall(LWS)" experiment. 
Similarly to the Primakov process of production of neutral mesons by high-energy photons in a strong electrical field, sub-eV ALPs can be produced from optical photons propagating in a strong magnetic field. 

Owing to their strongly reduced interaction with standard model particles,axions and ALPs can cross an optical barrier beyond which they may be regenerated into detectable photons by the inverse Primakov process. 

As dark matter candidates, interest in axions and ALPs goes beyond particle physics and intersects with cosmology. Last results from the OSQAR-LSW experiment will be presented.
They provide today the most stringent constraint on the di-photon coupling ever achieved in laser-based experiment[i]. 
The third objective of OSQAR is to look for the chameleon particle, from the search of a magnetic afterglow effect due to the possible coupling of chameleons to photons. 

This particle, with an environmentdependent mass, was proposed as a quintessence candidate of dark energy. 

An addendum to the OSQAR proposal has been issued beginning of 2015 to include the CHameleon Afterglow SearchExperimental scheme (CHASE) following the pioneering work of the GammeV collaboration. 
OSQAR-CHASE has been approved by the CERN-SPSC scientific committee. It will be presented highlighting its potential to improve the present exclusion limits constraining chameleon particles[ii]. 
The second part of this seminar will be devoted to ongoing high-field magnet developments at the Grenoble High Magnetic Field Laboratory (LNCMI-Grenoble) of CNRS. 
In particular, the large hybrid magnet user platform under construction[iii] will be presented highlighting its potential 
for the development of new microwave LSW or/and ADMX type experiments based on the large bore superconducting magnet, which will produced 9 T in a 800 mm diameter. 
This second part will provide the context for a possible promising collaboration between IBS-CAPP and CNRS-LNCMI and is expected to trigger fruitful discussions.

[i] R. Ballou, P. Pugnat, et al. (OSQAR collaboration), New Exclusion Limits for the Search of Scalar and Pseudoscalar Axion-Like Particles fromLight Shining Through a Wallaccepted for publication in Phys. Rev. D, http://arxiv.org/abs/1506.08082
[ii] http://cds.cern.ch/record/2001850/files/SPSC-P-331-ADD-1.pdf
[iii] P. Pugnat, et al., Progress Report on the 43 T Hybrid Magnet of the LNCMI-GrenobleIEEE Trans. on Appl. Supercond. 24, 4301305 (2014)

 

Contact: CAPP Administraion Office(350-8166) 

번호 날짜 장소 제목
142 2018-03-16 16:00  E6-2. 1st fl. #1323  Van der Waals Heterostructures from Quantum Transport to Ultrafast Optoelectronics file
141 2019-03-29 16:00  E6-2. 1st fl. #1323  Coherent Quantum Control and Magnetism on atoms – Trapped ion and ESR STM file
140 2019-04-19 16:00  E6-2. 1st fl. #1323  Graphene and hBN heterostructures file
139 2019-04-19 14:30  E6-2. 1st fl. #1323  A family of finite-temperature electronic phase transitions in graphene multilayers file
138 2018-12-26 16:00  E6-2. 1st fl. #1323  Brane-like defect in 3D toric code file
137 2017-06-02 14:30  E6-2. 1st fl. #1323  Quasiparticle Interference and Fourier transform scanning tunneling spectroscopy in WTe2 (Weyl semimetal) file
136 2022-09-30 14:30  E6-2. 1st fl. #1323 & Zoom  Putting a spin on the Josephson effect file
135 2022-11-18 14:30  E6-2. 1st fl. #1323 & Zoom  Kondo cloud condensation in a highly-doped semiconductor metal file
134 2022-09-30 16:00  E6-2. 1st fl. #1323 & Zoom  Spin-orbit torque-based spintronic devices file
133 2022-11-18 16:00  E6-2. 1st fl. #1323 & Zoom  Qubits, new experimental tools for physics file
132 2022-05-25 16:00  E6-2. 1st fl. #1323 / Zoom  Uncovering New Lampposts for Dark Matter: Continuum or Conformal
131 2016-04-01 14:30  E6-2. 1st fl. #1501  Interference of single charged particles without a loop and dynamic nonlocality
130 2016-04-01 16:15  E6-2. 1st fl. #1501  Cotunneling drag effect in Coulomb-coupled quantum dots
129 2016-03-11 16:00  E6-2. 1st fl. #1501  Jan. Switching handedness of of chiral solitons in Z4 topological insulators
128 2016-04-08 13:30  E6-2. 1st fl. #1501  Theoretical Overview of Iron-based superconductors and its future
127 2016-03-11 13:30  E6-2. 1st fl. #1501  Topological phases of matter in nonequilibrium: Topology of the Wannier-Stark ladder
126 2019-01-09 16:00  E6-2. 2nd fl. #2501  Molecular Mott state in the deficient spinel GaV4S8 file
125 2015-10-16 16:00  E6-2. 2nd fl. #2501  Fluctuations of entropy production in partially masked electric circuits
124 2015-09-14 14:00  E6-2. 2nd fl. #2501  Ultrafast X-ray Studies on Dynamics Matter in Extreme Conditions
123 2018-06-18 10:00  E6-2. 2nd fl. #2502  Rydberg electromagnetically induced transparency and microwave-to-optical conversion using Rydberg atoms file