|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)
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|93||Sep. 29 (Thu), 4:00 PM||E6-2. #2501(2nd fl.)||Dr. Minu Kim, Institute for Basic Science, Seoul National University||Exploring the phase diagram of BaBiO3: epic voyage of just another bad trip?|
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|91||4pm, Sep. 21 (Wed.||E6-2. #2502(2nd fl.)||Dr. Henrik Johannesson , University of Gothenburg (Sweden) and Beijing Computational Science Research Center (China)||Entanglement probe of two-impurity Kondo physics|
|90||Sep. 22, 2016(Thu), 3:30 PM||#1323(E6-2, 1st fl.)||Dr. Haiyang Yan (Institute of Nuclear Physics and Chemistry)||Polarized 3He, Polarized Neutrons and New Interactions beyond the Standard Model|
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|88||Sep. 02(Fri) 4:00 PM||E6-2(1st fl) #1323||Dr. Yong-Joo Doh, Department of Physics and Photon Science, GIST||Quantum Electrical Transport in Topological Insulator Nanowires|
|87||Sep. 02(Fri) 2:30 PM||E6-2(1st fl.), #1323||Dr. Yong-Hyun Kim,Graduate School of Nanoscience and Technology, KAIST||Nanoscale Thermal Physics: Seebeck Effect and Nanoscale Friction|
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|85||Jul. 28 (Thu.) 4PM||#1323(E6-2. 1st fl.)||Prof. Johannes Pollanen, Jerry Cowen Chair of Experimental Physics at Michigan State University||Low Dimensional Electrons: On the Road to Hybrid Quantum Systems|
|84||Jul. 08 (Fri.) 2PM||#1323(E6-2. 1st fl.)||Dr. Junhyun Lee, Harvard University||Electronic quasiparticles in the quantum dimer model|
|83||Jul. 07 (Thu.) 2PM||#1323(E6-2. 1st fl.)||Dr. Eun Ah Kim, CORNELL UNIV.||Let there be topological superconductors|
|82||Jul. 08 (Fri.) 11:00 AM||#1323(E6-2. 1st fl.)||Dr. Michael Lawler(Binghampton Univ. / Cornell Univ.)||Isostatic magnetism|
|81||Jun. 16 (Thu) 4PM||#1323(E6-2, 1st fl.)||Hyochul Kim, Samsung Advanced Institute of Technology||Quantum information processing using quantum dots and photonic crystal cavities|
|80||Jun. 14 (Tue) 4PM||Seminar Room (#2502, 2nd fl.)||Young-Sik Ra, Université Pierre et Marie Curie||Photonic quantum network based on multimode squeezed vacuums and single-photon subtraction|
|79||June 14, 2016 (Tue) 3PM||#1323 (E6-2 1st fl.)||Prof. Seungyong Hahn, Florida State University||No-Insulation High Temperature Superconductor Magnet Technology for Compact, Reliable, and Low-Cost High Field DC Magnets|
|78||Jun 1 (Wed) 4 PM||#1323(E6-2 1st fl.)||Kil-Byoung Chai, Caltech||Laboratory experiments relevant to mesospheric clouds, Saturn’s rings & astrophysical jets|
|77||May 31 (Tue.) 4 PM||#1323(E6-2, 1st fl.)||Dr. Kimin Kim, KAIST||Understanding 3D tokamak physics towards advanced control of toroidal plasma|
|76||Jun. 1(Wed) 10:30 AM||BK21 Conference Room (#1318, E6-2)||Dr. Noriaki Horiuchi, Editor, Nature Photonics||Welcome to Nature Photonics|