|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)
|공지||Sep.22 2022||E6-1 #1323||2022 가을학기 응집물리 및 광학 세미나 전체 일정|
|303||Oct. 18 (Tue.), 1:30 PM||1st fl. #1323(E6-2)||Dr. Chan-Ho Yang, Department of Physics, KAIST||"Visualization of oxygen vacancy in motion and the interplay with electronic conduction"|
|302||July 10 (Wed.), 04:00 PM-||Academic Cltural Complex (E9) 5층 스카이라운지||Prof. Sidney Nagel/Young-Kee Kim||Public Lectures|
|301||2015/08/04, 11PM||B501, Room Red, KI bldg. 5nd fl.||Dr. Eric Jin Ser Lee(Univ. of Manitoba, Canada)||Propagation of ultrasound through two- and three-dimensional strongly scattering media|
|300||Jun. 1(Wed) 10:30 AM||BK21 Conference Room (#1318, E6-2)||Dr. Noriaki Horiuchi, Editor, Nature Photonics||Welcome to Nature Photonics|
|299||October 15, 2020 (Thursday||CAPP Seminar Room #C303, Creation Hall (3F), KAIST Munji Campus||Prof. Gil-Ho Lee (POSTECH)||Graphene-based Josephson junction microwave bolometer|
|298||July 21, 2022 (Thu) 4:00 PM(KST)||CAPP Seminar Room C303, Creation Hall, KAIST Munji Campus||Prof. Jihn E. Kim (Kyoung Hee University)||Quintessential axions|
|297||Sep. 21, Wed. 4:00 PM||College of Natural Science E6-2, Rm. 1323||Prof. Duk-Yong Choi (Australian National University)||Materials and Device Nanofabrication of Optical Metasurfaces|
|296||2015/03/13, 2PM||Connect Room, KI Bldg.||The 15th Innovative Workshop on Soft/Bio Materials|
|295||2015/12/09, 11AM||E4(KI Building), Connect room (2nd fl.)||Arjun G. Yodh (University of Pennsylvania)||Functional Imaging & Monitoring of Brain & Breast with Diffuse Light|
|294||2015/12/17, 11:00AM||E4(KI Building), Matrix Hall (2nd fl.)||Dr. Jung-Hoon Park (Purdue University)||Wavefront engineering for in-vivo Deep brain imaging|
|293||2015/07/23,1:30PM||E4, B401||Prof. Gilles Lérondel (Univ. of Technology of Troyes)||Enhanced ZnO based UV photonics and related applications|
|292||Oct. 6th(Thursday) at 1:00 PM||E6 #1323||Dr. Monica Jinwoo Kang (Caltech)||Counting States with Global Symmetry|
|291||Apr. 13(Wed.) 10:30Am||E6 #1323/zoom||Mingu Kang (Max Planck POSTECH Korea Research Initiative)||Harnessing topology and correlations from singularities in 3d-kagome metals|
|290||Jan. 11th(Tue), 15:00||E6 #1501||Soyeun Kim(UIUC)||Ultrafast optical studies on CDW collective modes of the Weyl-CDW (TaSe4)2I|
|289||Jan. 26th (Tue), 13:00||E6 #1501||Dr. Hyojin Jung (NIMS)||An Introduction to Cohomology groups|
|288||Jul. 14th (THU), 14:15||E6 #1501 & Zoom||Dr. Hyeong Jun LEE(Institute of Natural Science, KAIST)||Hund and electronic correlations in ruthenium-based systems|
|287||Jul. 14th (THU), 13:30||E6 #1501 & Zoom||Dr. Jahyun Koo(Institute of Natural Science, KAIST)||Electronic structure and anomalous transport properties of topological materials by first principle calculation|
|286||Aug. 1st(Mon), 10:00AM||E6 #1501 & Zoom||손상모 박사(Space Telescope Science Institute (STScI)||[Update 세미나 영상] James Webb Space Telescope & OTE Commissioning|
|285||Jul. 14th (THU), 15:00||E6 #1501 & Zoom||Dr. Sunghun Kim(Institute of Natural Science, KAIST)||Pure two-dimensional quantum electron liquid and its phase transition|
|284||Jan. 25th (Tue), 15:00||E6 #1501/online||Junhyun Lee (Rutgers, the State University of New Jersey)||Emulating twisted double bilayer graphene with a multiorbital optical lattice|