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 2022-10-24 16:00  E6 #1501(공동강의실)  Physics Colloquim(Fall 2022)
공지 2022-09-21 10:30  E6-1 #1501  [Update 세미나 영상] Distinguished Lecture 'The Magic of Moiré Quantum Matter' Prof. Pablo Jarillo-Herrero(Department of Physics, MIT)
공지 2022-10-28 11:00  E6-2 #1323  [Update 세미나영상] (응집물리 세미나) Machine-Learning-Guided Prediction models and Materials discovery for high Tc cuprates
공지 2022-10-07 11:00  E6-2 #1323  [Update 세미나 영상] (응집물리 세미나) Competing orders in a vanadium-based kagome metal monolayer
공지 2022-09-23 11:00  E6-2 #1323  [Update 세미나 영상] (응집물리 세미나) Steady Floquet-Andreev states in graphene Josephson junctions
공지 2022-09-22 11:00  E6-1 #1323  2022 가을학기 응집물리 및 광학 세미나 전체 일정
113 2018-11-29 16:00  #1323, E6-2  양자 칸델라 실현을 위한 단일 광자 발생장치 개발 file
112 2022-04-01 16:00  Zoom webinar  High-field Electron Transport and Interaction Induced Phenomena in 2D Materials file
111 2015-11-24 16:00  E6-2, #1323  Topology-based understanding of spin dynamics in inhomogeneously magnetized systems
110 2016-07-08 14:00  #1323(E6-2. 1st fl.)  Electronic quasiparticles in the quantum dimer model
109 2016-10-18 15:00  E6-2. 1st fl. #1323  “Hybrid quantum systems with mechanical oscillators”
108 2015-12-17 11:00  E4(KI Building), Matrix Hall (2nd fl.)  Wavefront engineering for in-vivo Deep brain imaging
107 2018-07-27 13:30  #1323, E6-2  Magnetic reversal of artificial spin ice file
106 2018-07-27 13:30  #1323, E6-2  Magnetic reversal of artificial spin ice file
105 2017-07-14 15:00  #1323 (E6-2. 1st fl.)  Chiral anomaly in disordered Weyl semimetals file
104 2019-11-01 16:00  E6-2. 1st fl. #1323  Electron transport through weak-bonded contact metal with low dimensional nano-material file
103 2022-11-04 16:30  Zoom  초세대 협업연구실 Quantum- & Nano-Photonics_Multifunctional neural probes with integrated nanophotonics file
102 2019-09-27 14:30  E6-2. 1st fl. #1323  Spin-charge conversion in topological insulators for spintronic applications file
101 2018-12-07 16:00  E6-2. 1st fl. #1323  Novel probes of interacting electrons in 2D systems file
100 2018-10-19 10:00  #1323, E6-2  Energy conversion processes during magnetic reconnection in a laboratory plasma file
99 2016-11-04 13:30  E6-2. #1323(1st fl.)  Exotic phenomena at oxide LaAlO3/SrTiO3 hetero-interface and their applications
98 2015-08-03 10:30  E6-2, #1323 (Seminar Room)  Axion Search
97 2016-04-01 16:15  E6-2. 1st fl. #1501  Cotunneling drag effect in Coulomb-coupled quantum dots
96 2019-12-03 16:00  #1323, E6-2  Toward Quantum Materials with Correlated Oxides file
95 2017-03-02 16:00  #1323(E6-2. 1st fl.)  “Progress in the comparison of ARPES to DMFT for d and f strongly correlated electron systems”
94 2016-12-8 16:00  #1323(E6-2. 1st fl.)  Dynamical Resonance between Two Optical Cavities via Optomechanical Oscillator