visual
visual

세미나

  • HOME
  • >
  • 소식
  • >
  • 세미나
날짜 2016-05-19 15:00 
연사  
장소 May 19, 2016 (Thur.) 3PM, 

 

The CERN Resonant WISP Search: Development, Results and Lesson-Learned

   

May 19, 2016 (Thur.) 3PM, #5318(E6-2, 5th fl.)

Dr. Michael Betz, CERN

   

Weakly Interacting Sub-eV Particles (WISPs) could reveal the composition of cold dark matter in the universe and explain a large number of astrophysical phenomena. Despite their strong theoretical motivation, these hypothetical particles could not be observed in any experiment so far.

The "CERN Resonant WISP Search"(CROWS) probes the existence of WISPs using microwave techniques.

The heart of the table-top experiment are two high-Q microwave cavity resonators. The `emitting cavity` is driven by a power amplifier at 3 GHz, resulting in the build-up of a strong electromagnetic field inside. The `receiving cavity` is placed in close vicinity and connected to a sensitive microwave receiver.

Most theories predict a weak coupling between the two cavities due to a Photon to WISP conversion process. CROWS tries to observe that coupling, while mitigating electromagnetic crosstalk with a high-end (~ 300 dB) electromagnetic shielding enclosure for the receiving part of the experiment.

Although no WISPs were detected in the most sensitive measurement-runs in 2013, a previously unexplored region in the parameter space was opened up. For `Hidden Sector Photons`, a prominent member of the WISP family, the result corresponds to an improvement in sensitivity over the previous laboratory exclusion limit by a factor of ~7.

This talk shall give a brief introduction to WISPs, the experimental search efforts worldwide and then focus on the design and development of the CROWS experiment, which happened in the framework of the authors PhD.

The encountered engineering challenges and their solutions will be highlighted. This includes the high performance EMI shielding ( 300 dB through several layers), operating electronics in strong (3 T) magnetic fields, optical signal transmission and high sensitivity (P < 1E-24 W) microwave signal detection. The operation procedure and the lessons learned during various experimental runs are shown. Furthermore, several ideas are proposed, on how to improve the experiment and its sensitivity further.

 

Contact: T.8166(CAPP Administration Office)

번호 날짜 연사 제목
공지 2025-02-24 16:00    2025년 봄학기 콜로키움 안내
공지 2025-02-27 16:00    2025년 봄 물리학과 특별세미나 (광학/응집물리 분야)
534 2016-06-16 16:00    Quantum information processing using quantum dots and photonic crystal cavities
533 2016-07-07 14:00    Let there be topological superconductors
532 2016-07-08 11:00    Isostatic magnetism
531 2016-07-08 14:00    Electronic quasiparticles in the quantum dimer model
530 2016-07-28 16:00    Low Dimensional Electrons: On the Road to Hybrid Quantum Systems
529 2016-08-04 14:30    Relational Logic (with applications to Quantum Mechanics, String Theory, Cosmology, Neutrino Oscillations, Statistical Mechanics)
528 2016-09-02 14:30    Nanoscale Thermal Physics: Seebeck Effect and Nanoscale Friction
527 2016-09-02 16:00    Quantum Electrical Transport in Topological Insulator Nanowires
526 2016-09-05 16:00    Physics Colloquium : 2016 Fall file
525 2016-09-21 16:00    Entanglement probe of two-impurity Kondo physics
524 2016-09-22 15:30    Polarized 3He, Polarized Neutrons and New Interactions beyond the Standard Model
523 2016-09-22 15:30    Polarized 3He, Polarized Neutrons and New Interactions beyond the Standard Model
522 2016-09-29 16:00    2016 Fall, Physics Seminar Serises file
521 2016-09-29 16:00    Exploring the phase diagram of BaBiO3: epic voyage of just another bad trip?
520 2016-09-29 16:00    Large-scale Silicon Photonic MEMS Switches
519 2016-10-07 13:30    “Symmetry and topology in transition metal dichalcogenide?”
518 2016-10-07 16:00    “Tilt engineering of 4d and 5d transition metal oxides?”
517 2016-10-17 11:00    IMS and examples of the studies on optoelectronic materials
516 2016-10-18 13:30    "Visualization of oxygen vacancy in motion and the interplay with electronic conduction"
515 2016-10-18 15:00    “Hybrid quantum systems with mechanical oscillators”