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
179 2011-05-16 16:00  E6, 1501  Photonics with surface plasmon polaritons
178 2010-02-14 16:00  E6, 1501  Physics Colloquium - 2011 Spring file
177 2010-09-06 16:00  E6, 1501  Physics Colloquium : 2010 Fall file
176 2010-02-08 16:00  E6, 1501  Physics Ciolloquium : 2010 Spring file
175 2009-10-21 16:00  E6, 1501  Interdimensional Universality of Dynamic Interfaces
174 2009-09-07 16:00  E6, 1501  Physics Colloquium : 2009 Fall file
173 2009-02-23 16:00  E6, 1501  Physics Colloquium : 2009 Spring file
172 2022-05-30 16:00  E6, #1501  Light manipulation using 2D layered semiconductors
171 2022-05-23 16:00  E6, #1501  Novel electronic transport in topological van der Waals magnets
170 2022-05-16 16:00  E6, #1501  Design synthetic topological matter with atoms and lights
169 2022-05-09 16:00  E6, #1501  Searching for new electronic properties in correlated material flatland
168 2022-05-02 16:00  E6, #1501  What can we learn from the history of science and technology?(우리말강의)
167 2022-04-25 16:00  E6, #1501  Ultrafast electron beam, a tool to explore the nanoscopic world of materials(우리말강의)
166 2022-04-11 16:00  E6, #1501  Emergence of Statistical Mechanics in Quantum Systems
165 2022-04-04- 16:00  E6, #1501  New paradigms in Quantum Field Theory
164 2022-03-28 16:00  E6, #1501  Ultimate-density atomic semiconductor via flat bands
163 2022-03-21 16:00  E6, #1501  Multi-wavelength Studies on Relativistic Jets from Gamma-ray Bright Active Galactic Nuclei
162 2022-03-14 16:00  E6, #1501  Quantitative phase imaging and artificial intelligence: label-free 3D imaging, classification, and inference
161 2022-03-07 16:00  E6, #1501  Climate Physics and Modelling(우리말강의)
160 2022-02-28 16:00  E6, #1501  Spin-based training of optical microscopes