A5016674149- Dark Matter and Cosmic Phenomena
- Atomic and Subatomic Physics Research
- Particle physics theoretical and experimental studies
- Cosmology and Gravitation Theories
- Particle Detector Development and Performance
- Astrophysics and Cosmic Phenomena
- Nuclear Physics and Applications
- Superconducting and THz Device Technology
- Radiation Detection and Scintillator Technologies
- Cold Atom Physics and Bose-Einstein Condensates
- Quantum Information and Cryptography
- Nuclear reactor physics and engineering
- Particle accelerators and beam dynamics
- Scientific Research and Discoveries
- Computational Physics and Python Applications
- Gyrotron and Vacuum Electronics Research
- Strong Light-Matter Interactions
- Spectroscopy and Laser Applications
- Random lasers and scattering media
- Particle Accelerators and Free-Electron Lasers
- Astronomy and Astrophysical Research
- Solar and Space Plasma Dynamics
- Advanced Fiber Optic Sensors
- Geophysics and Gravity Measurements
- Opportunistic and Delay-Tolerant Networks
Lawrence Livermore National Laboratory
2016-2025
Lawrence Livermore National Security
2007-2024
Yale University
2017
Massachusetts Institute of Technology
2006-2014
Pennsylvania State University
2011
Purdue University West Lafayette
2011
Physical Sciences (United States)
2010
Vassar College
2004-2006
University of Maryland, College Park
2005
Rensselaer Polytechnic Institute
2003
Current upper bounds on the neutron electric dipole moment constrain physically observable quantum chromodynamic (QCD) vacuum angle $|\overline{\ensuremath{\theta}}|\ensuremath{\lesssim}{10}^{\ensuremath{-}11}$. Since QCD explains a great deal of experimental data from $100\phantom{\rule{0.3em}{0ex}}\mathrm{MeV}$ to TeV scale, it is desirable explain this smallness $|\overline{\ensuremath{\theta}}|$ in framework; strong $CP$ problem. There now exist two plausible solutions problem, one which...
Axions in the micro eV mass range are a plausible cold dark matter candidate and may be detected by their conversion into microwave photons resonant cavity immersed static magnetic field. The first result from such an axion search using superconducting first-stage amplifier (SQUID) is reported. SQUID amplifier, replacing conventional GaAs field-effect transistor successfully reached axion-photon coupling sensitivity band set present models sets stage for definitive utilizing near...
This Letter reports the results from a haloscope search for dark matter axions with masses between 2.66 and 2.81 μeV. The excludes range of axion-photon couplings predicted by plausible models invisible axion. unprecedented sensitivity is achieved operating large-volume at subkelvin temperatures, thereby reducing thermal noise as well excess ultralow-noise superconducting quantum interference device amplifier used signal power readout. Ongoing searches will provide nearly definitive tests...
Measurements of the positron fraction in high energy cosmic rays using space-borne Alpha Magnetic Spectrometer have been extended to energies 500 GeV. The new results show that stops increasing with at around 200
This Letter reports on a cavity haloscope search for dark matter axions in the Galactic halo mass range 2.81-3.31 μeV. utilizes combination of low-noise Josephson parametric amplifier and large-cavity to achieve unprecedented sensitivity across this range. excludes full axion-photon coupling values predicted benchmark models invisible axion that solve strong CP problem quantum chromodynamics.
We report on the first results from a new microwave cavity search for dark matter axions with masses above $20~\mu\text{eV}$. exclude axion models two-photon coupling $g_{a\gamma\gamma} \gtrsim 2\times10^{-14}~\text{GeV}^{-1}$ over range $23.55~\mu\text{eV} < m_a 24.0~\mu\text{eV}$. These represent two important achievements. First, we have reached cosmologically relevant sensitivity an order of magnitude higher in mass than any existing limits. Second, by incorporating dilution refrigerator...
We report on the results from a search for dark matter axions with HAYSTAC experiment using microwave cavity detector at frequencies between 5.6-5.8$\, \rm Ghz$. exclude axion models two photon coupling $g_{a\gamma\gamma}\,\gtrsim\,2\times10^{-14}\,\rm GeV^{-1}$, factor of 2.7 above benchmark KSVZ model over mass range 23.15$\,<\,$$m_a \,$<$\,$24.0$\,\mu\rm eV$. This doubles reported in our previous paper. achieve near-quantum-limited sensitivity by operating temperature $T<h\nu/2k_B$ and...
The International Axion Observatory (IAXO) will be a forth generation axion helioscope. As its primary physics goal, IAXO look for axions or axion-like particles (ALPs) originating in the Sun via Primakoff conversion of solar plasma photons. In terms signal-to-noise ratio, about 4–5 orders magnitude more sensitive than CAST, currently most powerful helioscope, reaching sensitivity to axion-photon couplings down few × 10−12 GeV−1 and thus probing large fraction unexplored ALP parameter space....
We introduce the Broadband Reflector Experiment for Axion Detection (BREAD) conceptual design and science program. This haloscope plans to search bosonic dark matter across [10^{-3},1] eV ([0.24, 240] THz) mass range. BREAD proposes a cylindrical metal barrel convert into photons, which novel parabolic reflector focuses onto photosensor. unique geometry enables enclosure in standard cryostats high-field solenoids, overcoming limitations of current dish antennas. A pilot 0.7 m^{2} experiment...
The Proceedings of the 2011 workshop on Fundamental Physics at Intensity Frontier. Science opportunities intensity frontier are identified and described in areas heavy quarks, charged leptons, neutrinos, proton decay, new light weakly-coupled particles, nucleons, nuclei, atoms.
The μeV axion is a well-motivated extension to the standard model. Axion Dark Matter eXperiment (ADMX) collaboration seeks discover this particle by looking for resonant conversion of dark-matter axions microwave photons in strong magnetic field. In Letter, we report results from pathfinder experiment, ADMX "Sidecar," which designed pave way future, higher mass, searches. This testbed experiment lives inside and operates tandem with main experiment. Sidecar excludes masses three widely...
We show that at higher frequencies, and thus axion masses, single-photon detectors become competitive ultimately favored, when compared to quantum-limited linear amplifiers, as the detector technology in microwave cavity experimental searches for galactic halo dark matter axions. The crossover point this comparison is of order 10 GHz ($\ensuremath{\sim}40\text{ }\text{ }\ensuremath{\mu}\mathrm{eV}$), not far above frequencies current searches.
Searching for axion dark matter, the ADMX Collaboration acquired data from January to October 2018, over mass range 2.81–3.31 μeV, corresponding frequency 680–790 MHz. Using an haloscope consisting of a microwave cavity in strong magnetic field, experiment excluded Dine-Fischler-Srednicki-Zhitnisky (DFSZ) axions at 90% confidence level and 100% matter density this entire range, except few gaps due mode crossings. This paper explains full analysis run 1B, motivating choices informed by...
We describe the first implementation of a Josephson Traveling Wave Parametric Amplifier (JTWPA) in an axion dark matter search. The operation JTWPA for period about two weeks achieved sensitivity to axion-like particle with axion-photon couplings above 10-13 Ge V-1 over narrow range masses centered around 19.84 µeV by tuning resonant frequency cavity 4796.7-4799.5 MHz. was operated insert experiment as part independent receiver chain that attached 0.56-l cavity. ability deliver high gain...
Hidden U(1) gauge symmetries are common to many extensions of the standard model proposed explain dark matter. The hidden vector bosons such may mix kinetically with photons, providing a means for electromagnetic power pass through conducting barriers. axion matter experiment detector was used search originating in an emitter cavity driven microwave power. We exclude kinetic couplings χ>3.48×10⁻⁸ masses less than 3 μeV. This limit represents improvement more 2 orders magnitude sensitivity...
Cold dark matter in the Milky Way halo may have structure defined by flows with low velocity dispersion. The Axion Dark Matter eXperiment high resolution channel is especially sensitive to axions such dispersion flows. Results from a combined power spectra analysis of axion search are presented along discussion assumptions underlying an analysis. We exclude Kim-Shifman-Vainshtein-Zakharov densities $\ensuremath{\rho}\ensuremath{\gtrsim}0.2\text{ }\text{ }\mathrm{GeV}/{\mathrm{cm}}^{3}$ and...
Axion dark matter experiment ultra-low noise haloscope technology has enabled the successful completion of two science runs (1A and 1B) that looked for axions in 2.66-3.1 μeV mass range with Dine-Fischler-Srednicki-Zhitnisky sensitivity [Du et al., Phys. Rev. Lett. 120, 151301 (2018) Braine 124, 101303 (2020)]. Therefore, it is most sensitive axion search to date this range. We discuss technological advances made last several years achieve sensitivity, which includes implementation...
The axion is a light pseudoscalar particle which suppresses CP-violating effects in strong interactions and also happens to be an excellent dark matter candidate. Axions constituting the halo of our galaxy may detected by their resonant conversion photons microwave cavity permeated magnetic field. current generation experiment has demonstrated sensitivity plausible models, upgrades progress should achieve required for definitive search, at least low mass axions. However, comprehensive...
Microwave cavities have been deployed to search for bosonic dark matter candidates with masses of a few μeV. However, the sensitivity these cavity detectors is limited by their volume, and traditionally employed half-wavelength suffer from significant volume reduction at higher masses. Axion experiment (ADMX)-Orpheus mitigates this issue operating tunable, dielectrically loaded higher-order mode, which allows detection remain large. The ADMX-Orpheus inaugural run excludes photon kinetic...
Dark matter makes up 85% of the in Universe and 27% its energy density, but we do not know what comprises dark matter. It is possible that composed either axions or photons, both which can be detected using an ultrasensitive microwave cavity known as a haloscope. The haloscope employed by ADMX consists cylindrical operating at ${\mathrm{TM}}_{010}$ mode sensitive to QCD axion with masses few $\ensuremath{\mu}\mathrm{eV}$. However, this design becomes challenging implement for higher masses....
We present first results from a dark photon matter search in the mass range 44 to 52 μeV (10.7-12.5 GHz) using room-temperature dish antenna setup called GigaBREAD. Dark converts ordinary photons on cylindrical metallic emission surface with area 0.5 m^{2} and is focused by novel parabolic reflector onto horn antenna. Signals are read out low-noise receiver system. A data taking run 24 days of does not show evidence for this range, excluding mixing parameters χ≳10^{-12} at 90% confidence...
We report the results of a QCD axion dark matter search with discovery ability for Dine-Fischler-Srednicki-Zhitnitsky (DFSZ) axions using an haloscope. Sub-Kelvin noise temperatures are reached ultralow Josephson parametric amplifier cooled by dilution refrigerator. This work excludes (with 90% confidence level) DFSZ masses between 3.27 to <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mrow><a:mn>3.34</a:mn><a:mtext> </a:mtext><a:mtext> </a:mtext><a:mi...