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)
465 2016-11-01 14:30    Search for dark sector particles in the B-factory experiments
464 2017-04-06 16:00    For whom the Belle tolls
463 2024-07-23 16:00    Spin Conversion Research Towards Novel Spintronic Functionalities file
462 2020-12-23 10:00    Online workshop for Quantitative Phase Imaging file
461 2015-10-23 10:30    How to write a good scientific paper[Open lecture series]
460 2018-05-17 13:30    Quantum Spin Liquid in Kitaev Materials file
459 2023-07-12 11:00    Study of spin-1/2 antiferromagnetic kagome Heisenberg model by symmetric projected entangled simplex states
458 2017-09-12 16:00    Exact Solution for the Interacting Kitaev Chain at Symmetric Point file
457 2017-09-13 16:00    An Introduction to Quantum Spin Liquids file
456 2023-12-08 10:30    Novel transport phenomena in insulators
455 2017-11-08 13:00    “Emergent exotic quasiparticles in quantum spin liquids” file
454 2020-09-22 09:30    Physics and applications of soliton microcombs(Quantum- & Nano-Photonics) file
453 2017-04-05 12:00    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
452 2024-11-21 16:00  Prof. Ulrich Höfer  Time-resolved photoemission: From bandstructure to orbital movies file
451 2020-10-09 09:00    Quantum Many-Body Simulation file
450 2023-11-08 10:00    [High Energy Theory seminar] The Vacuum Sector of Asymptotically Isometric Codes
449 2018-05-31 16:00    Dynamic control of optical properties with gated-graphene metamaterials file
448 2023-05-17 16:30    Detecting Hidden Photon Dark Matter via the Excitation of Qubits file
447 2023-02-20 16:00    Physics of ferromagnet/superconductor junctions
446 2025-02-17 16:00  Prof. Takehito Yokoyama  Unconventional spin-spin interaction mediated by Cooper pairs or phonons file