A5060055232- Atomic and Subatomic Physics Research
- Advanced MRI Techniques and Applications
- Advanced NMR Techniques and Applications
- Dark Matter and Cosmic Phenomena
- Physics of Superconductivity and Magnetism
- Particle physics theoretical and experimental studies
- NMR spectroscopy and applications
- Magnetic Field Sensors Techniques
- Quantum, superfluid, helium dynamics
- Nuclear Physics and Applications
- Geophysical and Geoelectrical Methods
- Cold Atom Physics and Bose-Einstein Condensates
- Geomagnetism and Paleomagnetism Studies
- Cosmology and Gravitation Theories
- Characterization and Applications of Magnetic Nanoparticles
- Magnetic and transport properties of perovskites and related materials
- Magnetic properties of thin films
- Non-Destructive Testing Techniques
- Electrical and Bioimpedance Tomography
- Scientific Research and Discoveries
- Medical Imaging Techniques and Applications
- Electron Spin Resonance Studies
- Superconducting and THz Device Technology
- Quantum Information and Cryptography
- Particle Detector Development and Performance
Institute for Basic Science
2018-2024
Korea Advanced Institute of Science and Technology
2019-2021
Los Alamos National Laboratory
2009-2019
University of Massachusetts Amherst
2019
Korea Research Institute of Standards and Science
2019
Conductive Composites (United States)
1997-2000
Institute of Radio-Engineering and Electronics
1989-1995
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...
Globally, the demand for improved health care delivery while managing escalating costs is a major challenge. Measuring biomagnetic fields that emanate from human brain already impacts treatment of epilepsy, tumours and other disorders. This roadmap explores how superconducting technologies are poised to impact care. Biomagnetism study magnetic biological origin. Biomagnetic typically very weak, often in femtotesla range, making their measurement challenging. The earliest vivo measurements...
Magnetic resonance imaging at ultralow fields (ULF MRI) is a promising new method that uses SQUID sensors to measure the spatially encoded precession of pre-polarized nuclear spin populations microtesla-range measurement field. In this work, seven-channel system designed for simultaneous 3D ULF MRI and magnetoencephalography (MEG) described. The includes seven second-order gradiometers characterized by magnetic field resolutions 1.2–2.8 fT Hz−1/2. It also equipped with five sets coils...
A cryogenic apparatus is described that enables a new experiment, nEDM@SNS, with major improvement in sensitivity compared to the existing limit search for neutron Electric Dipole Moment (EDM). This uses superfluid 4He produce high density of Ultra-Cold Neutrons (UCN) which are contained suitably coated pair measurement cells. The be operated at Spallation Neutron Source Oak Ridge National Laboratory, polarized 3He from an Atomic Beam injected into and transported cells where it serves as...
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...
Static electric dipole moments of nondegenerate systems probe mass scales for physics beyond the Standard Model well those reached directly at high energy colliders. Discrimination between different models, however, requires complementary searches in atomic-molecular-and-optical, nuclear and particle physics. In this report, we discuss current status prospects near future a compelling suite such experiments, along with developments needed encompassing theoretical framework.
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...
Recently it has become both possible and practical to use magnetic resonance (MR) at fields in the range from µT mT, so-called ultra-low-field (ULF) regime. SQUID (superconducting quantum interference device) sensor technology allows for ultra-sensitive detection while pulsed pre-polarizing greatly enhance signal. The instrumentation unprecedented flexibility signal acquisition sequences simplified MRI instrumentation. Here we present results a new application of ULF relaxometry...
In this paper we report the first co-registered, interleaved measurements of ultra-low field (ULF) magnetic resonance imaging (MRI) and magnetoencephalography (MEG). Interleaved are interesting for ultimate aim combining MEG functional MRI at ULF. The measurement system consisted 7 channels with second-order gradiometers coupled to low transition-temperature superconducting quantum interference devices (SQUIDs). ULF was acquired a 94 μT after pre-polarization in 30 mT field. Our results show...
SQUID-based MRI (magnetic resonance imaging) at microtesla fields has developed significantly over the past few years. Here we describe application of this method for magnetic relaxation measurements in living human brain. We report values longitudinal time T1 brain tissues, measured vivo first fields. The experiments were performed 46 muT field using a seven-channel SQUID system designed and MEG. Values T1, different tissues field, are found to be close (within 5%) corresponding transverse...
Magnetic resonance imaging (MRI) is the best method for non-invasive of soft tissue anatomy, saving countless lives each year. But conventional MRI relies on very high fixed strength magnetic fields, ≥ 1.5 T, with parts-permillion homogeneity, requiring large and expensive magnets. This because in Faraday-coil based systems signal scales approximately square field. Recent demonstrations have shown that can be performed at much lower fields (~100 μT, ULF regime). Through use pulsed...
Abstract Here we describe superparamagnetic relaxometry (SPMR), a technology that utilizes highly sensitive magnetic sensors and nanoparticles for cancer detection. Using SPMR, sensitively specifically detect conjugated to biomarkers various types of cancer. SPMR offers high contrast In measurements, brief magnetizing pulse is used align discrete size. Following the pulse, an array superconducting quantum interference detectors (SQUID) decaying magnetization field. NP size chosen so that,...
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...
Abstract Reducing noise to the quantum limit over a large bandwidth is fundamental requirement for future applications operating at millikelvin temperatures, such as neutrino mass measurement, next-generation X-ray observatory, CMB dark matter and axion detection, rapid high-fidelity readout of superconducting qubits. The read out sensitivity arrays microcalorimeter detectors, resonant axion-detectors, qubits, currently limited by temperature cryogenic amplifiers. Detector Array Readout with...
The advent of ultra-low noise microwave amplifiers revolutionized several research fields demanding quantum-limited technologies. Exploiting a theoretical bimodal description linear phase-preserving amplifier, in this contribution we analyze some the intrinsic properties model architecture (i.e., an rf-SQUID based Josephson Traveling Wave Parametric Amplifier) terms amplification and generation for key case study input states (Fock coherents). Furthermore, present analysis output signals...
Abstract The Center for Axion and Precision Physics Research at the Institute Basic Science in Republic of Korea is home to multiple active axion search experiments using cavity haloscopes that operate within frequency range 1–6 GHz. convert axions photons, resulting an output power about 10 $${^{-24}}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mmultiscripts> <mml:mrow/> <mml:mrow> <mml:mo>-</mml:mo> <mml:mn>24</mml:mn> </mml:mrow> </mml:mmultiscripts> </mml:math> –10...
Ultralow-noise microwave amplification and detection play a central role in different applications, going from fundamental physics experiments to the deployment of quantum technologies. In many applications necessity reading multiple detectors, or cavities qubits, calls for large bandwidth amplifiers with lowest possible noise. Current technologies are based on High Electron Mobility Transistors Josephson Parametric Amplifiers. Both have limitations, former terms minimum noise, latter...