A5069706170- Dark Matter and Cosmic Phenomena
- Particle physics theoretical and experimental studies
- Atomic and Subatomic Physics Research
- Cosmology and Gravitation Theories
- Physics of Superconductivity and Magnetism
- Pulsars and Gravitational Waves Research
- Superconducting and THz Device Technology
- Scientific Research and Discoveries
- Particle Detector Development and Performance
- Advanced Data Storage Technologies
- Neutrino Physics Research
- Semiconductor materials and devices
- Magnetic properties of thin films
- Cold Atom Physics and Bose-Einstein Condensates
- Quantum Chromodynamics and Particle Interactions
- Opportunistic and Delay-Tolerant Networks
- Quantum and Classical Electrodynamics
- Astrophysics and Cosmic Phenomena
- Quantum Information and Cryptography
- Particle accelerators and beam dynamics
- Geophysics and Sensor Technology
- Surface and Thin Film Phenomena
- Experimental and Theoretical Physics Studies
- Copper Interconnects and Reliability
Institute for Basic Science
2019-2024
Korea Advanced Institute of Science and Technology
2019-2023
The Center for Axion and Precision Physics Research at the Institute Basic Science is searching axion dark matter using ultralow temperature microwave resonators. We report exclusion of mass range $10.7126--10.7186\text{ }\text{ }\ensuremath{\mu}\mathrm{eV}$ with near Kim-Shifman-Vainshtein-Zakharov (KSVZ) coupling sensitivity $10.16--11.37\text{ about 9 times larger 90% confidence level. This first search result in these ranges. It also a resonator physical less than 40 mK.
We report an axion dark matter search at Dine-Fischler-Srednicki-Zhitnitskii sensitivity with the CAPP-12TB haloscope, assuming axions contribute 100% of local density. The excluded axion-photon coupling g_{aγγ} down to about 6.2×10^{-16} GeV^{-1} over mass range between 4.51 and 4.59 μeV a 90% confidence level. achieved experimental can also exclude Kim-Shifman-Vainshtein-Zakharov that makes up just 13% haloscope will continue wide masses.
We report the results of an axion dark matter search over mass range 9.39-9.51 ${\mu}$eV. A flux-driven Josephson parametric amplifier (JPA) was added to cryogenic receiver chain. system noise temperature as low 200 mK achieved, which is lowest recorded among published cavity experiments with phase-insensitive JPA operation. In addition, we developed a two-stage scanning method boosted scan speed by 26%. As result, two-photon coupling in plausible model for QCD excluded order magnitude...
We report an extensive high-sensitivity search for axion dark matter above 1 GHz at the Center Axion and Precision Physics Research (CAPP). The cavity resonant search, exploiting coupling between axions photons, explored frequency (mass) range of 1.025 (<a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mrow><a:mn>4.24</a:mn><a:mtext> </a:mtext><a:mtext> </a:mtext><a:mi mathvariant="normal">μ</a:mi><a:mi>eV</a:mi></a:mrow></a:math>) to 1.185 (<d:math...
In the search for axion dark matter, superconducting rf technology is important fabricating microwave cavities with high $Q$ factors, but presence of a strong external magnetic field leads to technical difficulties. This study presents polygonal design tapes high-temperature superconductor realize resonant cavity that shows no considerable degradation in fields up 8 Tesla. approach could impact engineering solutions improve dark-matter detection and other research areas requiring low loss field.
The axion, a consequence of the PQ mechanism, has been considered as most elegant solution to strong-CP problem and compelling candidate for cold dark matter. Center Axion Precision Physics Research (CAPP) Institute Basic Science (IBS) was established on 16 October 2013 with main objective launch state art axion experiments in South Korea. Relying haloscope technique, our strategy is run several parallel explore wide range masses sensitivities better than QCD models. We utilize not only...
A high Q-factor microwave resonator in a magnetic field could be used wide range of applications, especially for enhancing the scanning speed axion dark matter research. In this letter, we introduce polygon-shaped resonant cavity with commercial YBCO tapes covering entire inner wall. We demonstrated that maximum (TM$_{010}$, 6.93 GHz) superconducting was about 6 times higher than copper and showed no significant degradation up to 8 T at 4 K. This is first indication possible applications HTS...
We report an extensive high-sensitivity search for axion dark matter above 1\,GHz at the Center Axion and Precision Physics Research (CAPP). The cavity resonant search, exploiting coupling between axions photons, explored frequency (mass) range of 1.025\,GHz (4.24\,$\mu$eV) to 1.185\,GHz (4.91\,$\mu$eV). have introduced a number innovations in this field, demonstrating practical approach optimizing all relevant parameters haloscopes, extending presently available technology. CAPP 12\,T...
We report the first search for Sagittarius tidal stream of axion dark matter around $4.55\text{ }\text{ }\mathrm{\ensuremath{\mu}eV}$ using CAPP-12 TB haloscope data acquired in March 2022. Our result excluded Dine-Fischler-Srednicki-Zhitnitskii and Kim-Shifman-Vainshtein-Zakharov densities ${\ensuremath{\rho}}_{a}\ensuremath{\gtrsim}0.184$ $\ensuremath{\gtrsim}0.025\text{ }\mathrm{GeV}/{\mathrm{cm}}^{3}$, respectively, over a mass range from 4.51 to $4.59\text{ at 90% confidence level.
A high Q-factor microwave resonator in a magnetic field could be of great use wide range fields, from accelerator design to axion dark matter search. The natural choice material for the superconducting cavity placed is temperature superconductor (HTS) with critical field. deposition, however, high-quality, grain-aligned HTS film on three-dimensional surface technically challenging. We have fabricated polygon-shaped resonant commercial YBa$_2$Cu$_3$O$_{7-x}$ (YBCO) tapes covering entire inner...
We report an axion dark matter search at Dine-Fischler-Srednicki-Zhitnitskii sensitivity with the CAPP-12TB haloscope, assuming axions contribute 100\% of local density. The excluded axion--photon coupling $g_{aγγ}$ down to about $6.2\times10^{-16}$ GeV$^{-1}$ over mass range between 4.51 and 4.59 $μ$eV a 90\% confidence level. achieved experimental can also exclude Kim-Shifman-Vainshtein-Zakharov that makes up just 13\% haloscope will continue wide masses.
Analogous to the light-shining-through-wall setup proposed for axionlike particle searches, a pair of resonant cavities have been considered search an extra U(1) massive gauge boson, called hidden photon, which mediates interactions in sector. We propose new cavity configuration, consisting cylindrical emitter surrounded by hollow detector remarkably improve experimental sensitivity photon signals $\ensuremath{\mu}\mathrm{eV}$ mass range. An extensive study was conducted find optimal...
We report the results of an axion dark matter search over mass range 9.39-9.51 $μ$eV. A flux-driven Josephson parametric amplifier (JPA) was added to cryogenic receiver chain. system noise temperature as low 200 mK achieved, which is lowest recorded among published cavity experiments with phase-insensitive JPA operation. In addition, we developed a two-stage scanning method boosted scan speed by 26%. As result, two-photon coupling in plausible model for QCD excluded order magnitude higher...
We demonstrate a superconducting (SC) microwave (mw) cavity that can accelerate the dark matter search by maintaining superconductivity in high DC magnetic field. used high-temperature superconductor (HTSC) yttrium barium copper oxide (YBCO) with phase transition temperature of 90K to prevent SC failure Since direct deposition HTSC film on metallic mw is very difficult, we commercial tapes which are flexible coated thin films. fabricated resonating ($f_{TM010}$ ~ 6.89 GHz) third inner wall...
A high-quality factor microwave resonator in the presence of a strong magnetic field could have wide range applications, such as axion dark matter searches where two aspects must coexist to enhance experimental sensitivity. We introduce polygon-shaped cavity design with bi-axially textured YBa$_{2}$Cu$_{3}$O$_{7-x}$ superconducting tapes covering entire inner wall. Using 12-sided polygon cavity, we obtain substantially improved quality factors TM$_{010}$ mode at 6.9 GHz 4 K respect copper...
We report the first search for Sagittarius tidal stream of axion dark matter around 4.55 $μ$eV using CAPP-12TB haloscope data acquired in March 2022. Our result excluded Dine-Fischler-Srednicki-Zhitnitskii and Kim-Shifman-Vainshtein-Zakharov densities $ρ_a\gtrsim0.184$ $\gtrsim0.025$ GeV/cm$^{3}$, respectively, over a mass range from 4.51 to 4.59 at 90% confidence level.
The detection method of gravitational waves (GW) using electromagnetic (EM) cavities has garnered significant attention in recent years. This paper thoroughly examines the analysis for perturbation EM field and raises some issues existing literature. Our work demonstrates that rigid condition imposed on material, as provided literature, is inappropriate due to its reliance a gauge-dependent quantity cannot be controlled experimentally. Instead, we incorporate elasticity into material revise...
IBS/CAPP has launched CAPP-PACE, direct axion detection experiment aimed at a frequency range of 2.45 - 2.75 GHz. In the present detector setup, we utilize 1 K HEMT amplifiers which are world-best commercial available silicon-based low temperature amplifier. However, in order to reach QCD sensitivity and speed up experiment, currently examining possibility replacing first stage with SQUID amplifier could reduce noise drastically. A MSA (Microstrip Amplifier) is good option for achieving...
CAPP’s flagship axion experiment, CULTASK, employs dilution refrigerators to lower the physical temperature of resonant cavities less than 40 mK - coldest ever for search. We prepared a complete set microwave detector (CAPP-PACE) equipped with an 8 T superconducting magnet 12 cm inner bore in order search axions frequency around 2.5 GHz. The tuning system installed split-design cavity high Q-factor utilizes piezoelectric actuators interchangeable sapphire and copper rods performs flawlessly...