A5062623467- Dark Matter and Cosmic Phenomena
- Particle physics theoretical and experimental studies
- Cosmology and Gravitation Theories
- Astrophysics and Cosmic Phenomena
- Atomic and Subatomic Physics Research
- Particle Detector Development and Performance
- Radio Astronomy Observations and Technology
- Scientific Research and Discoveries
- Quantum Chromodynamics and Particle Interactions
- Muon and positron interactions and applications
- Neutrino Physics Research
- Superconducting and THz Device Technology
- Computational Physics and Python Applications
- Galaxies: Formation, Evolution, Phenomena
- Astrophysics and Star Formation Studies
- Physics of Superconductivity and Magnetism
- Precipitation Measurement and Analysis
- Particle Accelerators and Free-Electron Lasers
- Stellar, planetary, and galactic studies
- Advanced Thermodynamic Systems and Engines
- High-Energy Particle Collisions Research
- Quantum Mechanics and Applications
- Particle accelerators and beam dynamics
- Quantum Information and Cryptography
- Cold Atom Physics and Bose-Einstein Condensates
Institute for Basic Science
2016-2023
Korea Advanced Institute of Science and Technology
2021
Korea Astronomy and Space Science Institute
2021
University of Illinois System
2019
Korea University
2013
We present the first results of Fermilab Muon g-2 Experiment for positive muon magnetic anomaly $a_\mu \equiv (g_\mu-2)/2$. The is determined from precision measurements two angular frequencies. Intensity variation high-energy positrons decays directly encodes difference frequency $\omega_a$ between spin-precession and cyclotron frequencies polarized muons in a storage ring. ring field measured using nuclear resonance probes calibrated terms equivalent proton spin precession...
The Muon g-2 Experiment at Fermi National Accelerator Laboratory (FNAL) has measured the muon anomalous precession frequency $ω_a$ to an uncertainty of 434 parts per billion (ppb), statistical, and 56 ppb, systematic, with data collected in four storage ring configurations during its first physics run 2018. When combined a precision measurement magnetic field experiment's ring, determines anomaly $a_μ({\rm FNAL}) = 116\,592\,040(54) \times 10^{-11}$ (0.46 ppm). This article describes...
An axion dark matter search with the CAPP-8TB haloscope is reported. Our results are sensitive to axion-photon coupling g_{aγγ} down QCD band over mass range between 6.62 and 6.82 μeV at a 90% confidence level, which most result in date.
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 Fermi National Accelerator Laboratory has measured the anomalous precession frequency $a^{}_\mu = (g^{}_\mu-2)/2$ of muon to a combined precision 0.46 parts per million with data collected during its first physics run in 2018. This paper documents measurement magnetic field storage ring. is monitored by nuclear resonance systems and calibrated terms equivalent proton spin spherical water sample at 34.7$^\circ$C. weighted distribution resulting $\tilde{\omega}'^{}_p$, denominator ratio...
The CAST-CAPP axion haloscope, operating at CERN inside the CAST dipole magnet, has searched for axions in 19.74 $\mu$eV to 22.47 mass range. detection concept follows Sikivie haloscope principle, where Dark Matter convert into photons within a resonator immersed magnetic field. is an array of four individual rectangular cavities inserted strong phase-matched maximize sensitivity. Here we report on data acquired 4124 h from 2019 2021. Each cavity equipped with fast frequency tuning mechanism...
We first report an axion haloscope search with toroidal geometry. In this pioneering search, we exclude the axion-photon coupling ${g}_{a\ensuremath{\gamma}\ensuremath{\gamma}}$ down to about $5\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}8}\text{ }\text{ }{\mathrm{GeV}}^{\ensuremath{-}1}$ over mass range from 24.7 $29.1\text{ }\ensuremath{\mu}\mathrm{eV}$ at a 95% confidence level. The prospects for dark matter searches larger scale geometry are also considered.
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...
We review the electro-magnetic energy at axion haloscopes and find that electric corresponding magnetic stored in cavity modes or, equivalently, mode dependent form factors are same regardless of position inside solenoid. Furthermore, we extend our argument to cases satisfying $\stackrel{\ensuremath{\rightarrow}}{\ensuremath{\nabla}}\ifmmode\times\else\texttimes\fi{}{\stackrel{\ensuremath{\rightarrow}}{B}}_{\text{external}}=0$, where...
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...
This paper presents the beam dynamics systematic corrections and their uncertainties for Run-1 data set of Fermilab Muon g-2 Experiment. Two to measured muon precession frequency $\omega_a^m$ are associated with well-known effects owing use electrostatic quadrupole (ESQ) vertical focusing in storage ring. An average vertically oriented motional magnetic field is felt by relativistic muons passing transversely through radial electric components created ESQ system. The correction depends on...
We developed a system that continuously maintains cryocooler for long periods on rotating table. A cryostat holds the is set compressor located ground and supplies high-purity (>99.999%) high-pressure (1.7 MPa) helium gas electricity to cryocooler. The operation of other instruments requires development interface components between combination access holes at center table two rotary joints allows simultaneous circulation gas. provides innovative functions under condition, cooling from...
This work demonstrates that two systematic errors, coherent betatron oscillations (CBO) and muon losses can be reduced through application of radio frequency (RF) electric fields, which ultimately increases the sensitivity $g-2$ experiments. As ensemble polarized muons goes around a weak focusing storage ring, their spin precesses, when they decay interaction, $\mu^+ \rightarrow e^+ \nu_e \bar{\nu_\mu}$, positrons are detected by electromagnetic calorimeters. In addition to expected...
We, the Institute for Basic Science Center Axion and Precision Physics Research report first axion dark matter search with toroidal geometry. In this pioneering search, we exclude axion-photon coupling ${g}_{a \gamma \gamma}$ down to about $5 \times {10}^{-8}~ {\rm GeV}^{-1}$ over mass range from 24.7 29.1 $\mu \rm eV $ at 95\% confidence level.
The axion is a hypothetical particle proposed to solve the strong $CP$ problem, and also candidate for dark matter. This non-relativistic in galactic halo can be converted into photon under magnetic field detected with microwave resonant cavity. Relying on this detection method, many experiments have excluded some mass regions certain sensitivities terms of axion-photon coupling ($g_{aγγ}$) decades, but no matter has been discovered date. CAPP-8TB an haloscope experiment at IBS/CAPP designed...
Polarized patterns in the cosmic microwave background (CMB) radiation contains rich knowledge for early stage of universe. In particular their odd-parity at large angular scale (> 1°), primordial B-modes, are smoking-gun evidence inflation. The GroundBIRD experiment aims to detect these B-modes with a ground-based apparatus that includes several novel devices: high-speed rotational scan system, cold optics, and kinetic inductance detectors (MKIDs). We plan start observations Canary Islands...
One of the most significant and practical figures merit in axion haloscope searches is scanning rate, because unknown mass. Under best experimental parameters, only way to improve figure increase experimentally designed signal noise ratio search analysis procedure. In this paper, we report an improved using data taken by CAPP-8TB haloscope. By correcting for background biased parametrizations presence signals, realized a efficiency about 100\%. Given analyses date, rate can be 21\%, with...
Our understanding of physics at very early Universe, as 10 −35 s after the Big Bang, relies on scenario known inflationary cosmology. Inflation predicts a particular polarization pattern in cosmic microwave background, B -mode yet strength such is extremely weak. To search for we are constructing an off-axis rotating telescope to mitigate systematic effects well maximize sky coverage observation. We will discuss present status GroundBIRD telescope.
본 논문에서는 저잡음 증폭기와 무바이어스 쇼트키 다이오드를 사용하여 W-Band에서 동작하는 밀리미터파 다이오드 검출기를 설계, 제작하였다. 향상된 감도 특성을 얻기 위해 검출기는 검출기와 증폭기로 구성된다. 증폭기단은 발진을 제거하기 위해, 높은 저지 대역 갖도록 설계된 하우징에 증폭기 MMIC 칩을 사용해 제작한다. 검출기단은 단순한 구조를 사용하기 쇼트기 사용하고, 증폭기단과의 연결을 용이하도록 하기 평면형으로 설계한다. 설계 및 제작된 W-band 입력 전력 -45~-20 dBm의 변화에 대하여 20~500 mV의 출력 전압을 얻었다. 수동 영상 시스템에 적용할 수 있다. In this paper, a millimeter-wave detector using zero-bias schottky diode is designed and fabricated at W-band. It consists of LNA(Low Noise Amplifier) module to improve...
A survey project of TRAO with the fifteen beam array receiver system is presented. multibeam has been purchased from FCRAO, and being installed on 14m telescope. The target region <TEX>${\iota}=120^{\circ}{\sim}137^{\circ},\;b=-1^{\circ}{\sim}+ 1^{\circ}$</TEX>, velocity resolution would be 1 km/sec after smoothing original <TEX>$0.64km\;s^{-1}$</TEX> in transition J = 1-0 <TEX>$^{13}CO$</TEX>. a part <TEX>$^{12}CO$</TEX> Outer Galaxy Survey(OGS), an extension Bell Laboratories...