A5058446469- Dark Matter and Cosmic Phenomena
- Particle physics theoretical and experimental studies
- Atomic and Subatomic Physics Research
- Physics of Superconductivity and Magnetism
- Cosmology and Gravitation Theories
- Superconducting and THz Device Technology
- Scientific Research and Discoveries
- Particle accelerators and beam dynamics
- Particle Detector Development and Performance
- Quantum Chromodynamics and Particle Interactions
- Cold Atom Physics and Bose-Einstein Condensates
- Quantum, superfluid, helium dynamics
- Magnetic properties of thin films
- Opportunistic and Delay-Tolerant Networks
- Advanced Data Storage Technologies
- Quantum and electron transport phenomena
Institute for Basic Science
2019-2024
Korea Advanced Institute of Science and Technology
2019-2020
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.
The axion, a hypothetical elementary pseudoscalar, is expected to solve the strong CP problem of QCD and also promising candidate for dark matter. most sensitive axion search experiments operate at millikelvin temperatures hence rely on instrumentation that carries signals from system cryogenic room temperature instrumentation. One biggest limiting factors affecting parameter scanning speed these detectors noise added by components in signal detection chain. Since first amplifier chain...
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.
We report results of our development two types microwave amplifiers based on Superconducting quantum interference devices (SQUIDs) for CAPP (Center Axion and Precision Physics Research) axion search experiments. The first amplifier, Microstrip SQUID Amplifier (MSA) has a wide bandwidth. Power dissipation in resistive shunts device overheating limits the MSA performances. A thermal models shunt cooling processes is developed recommendations future design provided. second Josephson Parametric...
The axion is an excellent candidate for cold dark matter. In 1983, Sikivie \cite{Sikivie} proposed the scheme to detect axions using a resonant cavity inside high magnetic field. order in his scheme, we need scan range of frequencies where converted photon signal gets enhanced. This poster presents ways design frequency tuning system with conducting and dielectric materials cavity. simulation software package COMSOL Multiphysics was used evaluate effects on $Q$-factor form factor different...
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.
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...