visual
visual

세미나

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

 

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 장소 제목
342 2012-02-13 16:00  E6, 1501  Physics Colloquium : 2012 Spring
341 2011-09-03 16:00  E6, 1501  Physics Colloquium : 2011 Fall file
340 2011-05-16 16:00  E6, 1501  Photonics with surface plasmon polaritons
339 2010-02-14 16:00  E6, 1501  Physics Colloquium - 2011 Spring file
338 2010-09-06 16:00  E6, 1501  Physics Colloquium : 2010 Fall file
337 2010-02-08 16:00  E6, 1501  Physics Ciolloquium : 2010 Spring file
336 2009-10-21 16:00  E6, 1501  Interdimensional Universality of Dynamic Interfaces
335 2009-09-07 16:00  E6, 1501  Physics Colloquium : 2009 Fall file
334 2009-02-23 16:00  E6, 1501  Physics Colloquium : 2009 Spring file
333 2023-06-26 11:00  E6, Rm#1323  Quantum computing on magnetic racetracks with flying domain wall qubits
332 2023-08-24 11:00  E6, Rm#1323  Advancing magnonic metamaterials: spin waves in nanomagnetic arrays
331 2023-09-27 16:00  E6, Rm#2501  Chiral Magnets: Domain-Wall Skyrmions and String Theory Realization
330 2014-12-22 14:00  E6, Rm1319  Dynamics of molecular motors: Power stroke vs Brownian ratchet file
329 2022-04-08 11:00  E6-1 #1323  (응집물리 세미나) Flat-surface-assisted physical phenomena occurring in single crystal metal thin film file
328 2022-08-12 10:00  E6-1 #1323  Twisted Bilayer Magnets file
327 2022-08-12 10:00  E6-1 #1323  Twisted Bilayer Magnets file
326 2022-03-25 11:00  E6-1 #1323  (응집물리 세미나) Hund's metallicity in ruthenate systems file
325 2022-08-18 10:00  E6-1 #1323  Disorder-driven phase transition in the second-order non-Hermitian skin effect
324 2022-05-20 11:00  E6-1 #1323  (응집물리 세미나) Exploration of new polymorphs in van der Waals crystals
323 2022-09-22 11:00  E6-1 #1323  2022 가을학기 응집물리 및 광학 세미나 전체 일정 file