|장소||May 19, 2016 (Thur.) 3PM,|
|일시||May 19, 2016 (Thur.) 3PM|
|연사||Dr. Michael Betz, CERN|
The CERN Resonant WISP Search:
May 19, 2016 (Thur.) 3PM, #5318(E6-2, 5th fl.)
Dr. Michael Betz, CERN
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)
|127||Mar. 16 (Fri.), 02:30 PM||E6-2. 1st fl. #1323||Dr. JinHee Kim||산화물 다층박막에서의 다양한 물리현상|
|126||Sep. 10 (Tue.), 03:00 PM||E6-2. 1st fl. #1323||Dr. Mikhail Kiselev||Two-Stage Kondo Effect|
|125||Sep. 27 (Fri.), 04:00 PM||E6-2. 1st fl. #1323||Dr. Jindong Song||0D/1D/2D/3D III-V materials grown by MBE for Optelectronics|
|124||Dec. 7 (Fri.), 04:00 PM||E6-2. 1st fl. #1323||Dr. Joon Ho Jang||Novel probes of interacting electrons in 2D systems|
|123||Jun. 01 (Fri.), 11:00 AM||E6-2. 1st fl. #1323||Dr. Seung Sae Hong||Topological phases in low-dimensional quantum materials|
|122||Sep. 27 (Fri.), 02:30 PM||E6-2. 1st fl. #1323||Dr. Joon Sue Lee||Spin-charge conversion in topological insulators for spintronic applications|
|121||May. 17 (Thu.), 01:30 PM||E6-2. 1st fl. #1323||Prof. Yong-Baek Kim University of Toronto||Quantum Spin Liquid in Kitaev Materials|
|120||Sep. 22 (Fri.), 04:00 PM||E6-2. 1st fl. #1323||Dr. GilHo Lee / Department of Physics, POSTECH||Unexpected Electron-Pairing in Integer Quantum Hall Effect|
|119||Oct. 18 (Tue.), 3PM||E6-2. 1st fl. #1323||Dr. JunHo Suh, Korea Research Institute of Standards and Science||“Hybrid quantum systems with mechanical oscillators”|
|118||DEC. 27 (Thu), 04:00 PM||E6-2. 1st fl. #1323||Prof. Na Young Kim||Quantum Innovation (QuIN) Laboratory|
|117||Apr. 28 (Fri.), 02:30 PM||E6-2. 1st fl. #1323||Dr. JeongYoung Park Graduate School of EEWS, KAIST||Hot electron generation at surfaces and its impact to catalysis and renewable energy conversion|
|116||Nov. 9 (Fri.), 04:00 PM||E6-2. 1st fl. #1323||Dr. Donghun Lee||Quantum sensing and imaging with diamond defect centers for nano-scale spin physics|
|115||Nov. 9 (Fri.), 02:30 PM||E6-2. 1st fl. #1323||Dr. Pilkyung Moon||Moiré superlattices – from twisted bilayer graphene to quasicrystal|
|114||Mar. 16 (Fri.), 04:0 PM||E6-2. 1st fl. #1323||Dr. YoungDuck Kim||Van der Waals Heterostructures from Quantum Transport to Ultrafast Optoelectronics|
|113||Oct. 12 (Fri.), 02:30 PM||E6-2. 1st fl. #1323||Dr. Daniel Kyungdeock Park||Quantum Advantage in Learning Parity with Noise|
|112||DEC. 11 (Tue), 04:00 PM||E6-2. 1st fl. #1323||Prof. Hiroshi Shinaoka||Natural compact representation of Matsubara Green’s functions: applications to analytic continuation and quantum many-body simulations|
|111||Sep. 22 (Fri.), 01:00 PM||E6-2. 1st fl. #1323||Dr. EunSeong Kim / Department of Physics, KAIST||Superconductor-metal-insulator transition in thin Tantalum films|
|110||Jun. 2 (Fri.), 02:30 PM||E6-2. 1st fl. #1323||Dr. Euyheon Hwang(황의헌)||Quasiparticle Interference and Fourier transform scanning tunneling spectroscopy in WTe2 (Weyl semimetal)|
|109||May. 12 (Fri.), 01:30 PM||E6-2. 1st fl. #1323||Dr. Young Kuk Kim||Topological Dirac insulator|
|108||Sep. 22 (Fri.), 02:30 PM||E6-2. 1st fl. #1323||Dr. GilHo Lee / Department of Physics, POSTECH||Quantum Electronic Transport in Graphene Hybrid Nanostructures|