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
공지 2022-11-25 11:00  E6-2 #1323  [Update 세미나영상](응집물리 세미나) DMFT+ NRG: From models to real materials, from local to nonlocal correlations
317 2017-03-21 16:00  Seminar Room 1323  Spring 2017: Physics Seminar Serises file
316 2017-03-24 14:30  #1323 (1st fl. E6-2).  Topological Dynamics
315 2017-03-24 16:00  #1323 (1st fl. E6-2)  Graphene based nano electronics and nano electromechanics; focusing on precise control of nano structures for studying accurate physical properties
314 2017-04-05 12:00  Room 101, Creative Learning Bldg.(E11)  2017년 4월 첫수 융합포럼 개최 안내(물리학과 & 원자력 및 양자공학과 공동 개최)/The First Wednesday Multidisciplinary Forum in April 2017 organized by Dept. of Physics & Dept. of Nuclear & Quantum Engineering file
313 2017-04-06 16:00  IBS CAPP seminar room, Creation Hall (3F), KAIST Munji Campus  For whom the Belle tolls
312 2017-04-27 16:00  Seminar Room(#1323, E6-2)  반도체 양자점을 이용한 단광자 광원
311 2017-04-28 14:30  E6-2. 1st fl. #1323  Hot electron generation at surfaces and its impact to catalysis and renewable energy conversion
310 2017-04-28 16:00  #1323 (E6-2. 1st fl.)  Carbon nanotubes coupled to superconducting impedance matching circuits
309 2017-05-12 13:30  E6-2. 1st fl. #1323  Topological Dirac insulator
308 2017-06-02 14:30  E6-2. 1st fl. #1323  Quasiparticle Interference and Fourier transform scanning tunneling spectroscopy in WTe2 (Weyl semimetal) file
307 2017-06-02 16:00  #1323 (E6-2. 1st fl.)  Maxwell's demon in quantum wonderland file
306 2017-07-10 16:00  Jul. 10th (Mon), 4pm  “Intertwined Orders in a Heavy-fermion metal” file
305 2017-07-14 15:00  #1323 (E6-2. 1st fl.)  Chiral anomaly in disordered Weyl semimetals file
304 2017-08-16 16:00  #1322 (E6-2. 1st fl.)  Phonon-driven spin-Floquet valleytro-magnetism file
303 2017-08-31 14:00  #5318(E6-2. 5th fl.)  “Berry phase and nonlinear response: photocurrent in noncentrosymmetric insulators and Weyl semimetals” file
302 2017-09-12 16:00  #1323 (E6-2. 1st fl.)  Exact Solution for the Interacting Kitaev Chain at Symmetric Point file
301 2017-09-13 16:00  #1323 (E6-2. 1st fl.)  An Introduction to Quantum Spin Liquids file
300 2017-09-22 13:00  E6-2. 1st fl. #1323  Superconductor-metal-insulator transition in thin Tantalum films file
299 2017-09-22 14:30  E6-2. 1st fl. #1323  Quantum Electronic Transport in Graphene Hybrid Nanostructures file
298 2017-09-22 16:00  E6-2. 1st fl. #1323  Unexpected Electron-Pairing in Integer Quantum Hall Effect file