|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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|135||AUG. 31 (Thu.), 2 PM||#5318(E6-2. 5th fl.)||Prof. Hiroaki Ishizuka (The University of Tokyo)||“Berry phase and nonlinear response: photocurrent in noncentrosymmetric insulators and Weyl semimetals”|
|134||Aug. 16 (Wed.), 4 PM||#1322 (E6-2. 1st fl.)||Prof. Noejung Park (UNIST)||Phonon-driven spin-Floquet valleytro-magnetism|
|133||July. 14 (Fri.), 3:00 PM||#1323 (E6-2. 1st fl.)||Dr. Jun Hyun Lee / University of Maryland||Chiral anomaly in disordered Weyl semimetals|
|132||#1323(E6-2. 1st fl.)||Jul. 10th (Mon), 4pm||Dr. Duk Young Kim Los Alamos National Laboratory||“Intertwined Orders in a Heavy-fermion metal”|
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|126||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|
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|122||2017/03/21 - 06/08||Seminar Room 1323||조길영 박사(KAIST) 외||Spring 2017: Physics Seminar Serises|
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