F. Kuchler
A5048293624- Atomic and Subatomic Physics Research
- Quantum, superfluid, helium dynamics
- Nuclear Physics and Applications
- Advanced Frequency and Time Standards
- Dark Matter and Cosmic Phenomena
- Cold Atom Physics and Bose-Einstein Condensates
- Advanced NMR Techniques and Applications
- Terahertz technology and applications
- Particle physics theoretical and experimental studies
- Radiation Detection and Scintillator Technologies
- Metamaterials and Metasurfaces Applications
- Fusion materials and technologies
- Plasmonic and Surface Plasmon Research
- Geophysical and Geoelectrical Methods
- Noncommutative and Quantum Gravity Theories
- Quantum Chromodynamics and Particle Interactions
- Electron and X-Ray Spectroscopy Techniques
- Earthquake Detection and Analysis
- Magnetic Properties of Alloys
- Advanced Sensor Technologies Research
- Quantum Mechanics and Applications
- Non-Destructive Testing Techniques
- Scientific Measurement and Uncertainty Evaluation
- Radioactive Decay and Measurement Techniques
- Advanced MRI Techniques and Applications
TRIUMF
2019-2023
University of British Columbia
2023
Technical University of Munich
2009-2022
Campbell Collaboration
2022
Excellence Cluster Universe
2009-2019
Ludwig-Maximilians-Universität München
2008
A versatile and portable magnetically shielded room with a field of (700 ± 200) pT within central volume 1 m × gradient less than 300 pT/m, achieved without any external stabilization or compensation, is described. This performance represents more hundredfold improvement the state art for two-layer magnetic shield provides an environment suitable next generation precision experiments in fundamental physics at low energies; particular, searches electric dipole moments systems tests...
We report results of a new technique to measure the electric dipole moment $^{129}\mathrm{Xe}$ with $^{3}\mathrm{He}$ comagnetometry. Both species are polarized using spin-exchange optical pumping, transferred measurement cell, and transported into magnetically shielded room, where SQUID magnetometers detect free precession in applied magnetic fields. The result from one week campaign 2017 2.5 2018, combined detailed study systematic effects, is...
A clock comparison experiment, analyzing the ratio of spin precession frequencies stored ultracold neutrons and 199Hg atoms, is reported. No daily variation this could be found, from which set an upper limit on Lorentz invariance violating cosmic anisotropy field b perpendicular < 2 x 10(-20) eV (95% C.L.). This first for free neutron. result also interpreted as a direct gravitational dipole moment neutron |gn| 0.3 eV/c2 m spin-dependent interaction with Sun. Analyzing Earth, based previous...
We present a magnetically shielded environment with damping factor larger than 1 × 106 at the mHz frequency regime and an extremely low field gradient over extended volume. This extraordinary shielding performance represents improvement of state-of-the-art in difficult very low-frequency distortions by more order magnitude. technology enables new generation high-precision measurements fundamental physics metrology, including searches for far beyond reach accelerator-based experiments....
We performed ultracold neutron storage measurements to search for additional losses due (n) mirror-neutron (n′) oscillations as a function of an applied magnetic field B. In the presence mirror B′, would be maximal B≈B′. did not observe any indication nn′ and placed lower limit on oscillation time τnn′>12.0 s at 95% C.L. B′ between 0 12.5 μT.Received 26 May 2009DOI:https://doi.org/10.1103/PhysRevD.80.032003©2009 American Physical Society
We report the design and performance of a nonmagnetic drift stable optically pumped cesium magnetometer with measured sensitivity 35 fT at 200 s integration time stability below 50 between 70 600 s. The sensor is based on nonlinear magneto-optical rotation effect: in Bell–Bloom configuration, higher order polarization moment (alignment) Cs atoms created pump laser beam an anti-relaxation coated Pyrex cell under vacuum, filled vapor room temperature. plane light passing through modulated due...
We characterize terahertz metamaterials by applying apertureless near-field microscopy with a bandwidth that covers the entire spectral response of structures. The observations agree interpretation fundamental mode metamaterial. But high frequency resonance shows properties deviate from common interpretation. show is governed surface Plasmon excitations, which have comparable oscillator strength as mode.
We installed a source for ultracold neutrons at new, dedicated spallation target TRIUMF. The was originally developed in Japan and uses superfluid-helium converter cooled to 0.9$\,$K. During an extensive test campaign November 2017, we extracted up 325000 after one-minute irradiation of the target, over three times more than previously achieved with this source. corresponding ultracold-neutron density whole production guide volume is 5.3$\,$cm$^{-3}$. storage lifetime initially 37$\,$s...
We propose an original test of Lorentz invariance in the interaction between a particle spin and electromagnetic field report on first measurement using ultracold neutrons. used high-sensitivity neutron electric dipole moment (nEDM) spectrometer searched for direction dependence nEDM signal leading to modulation its magnitude at periods 12 24 hours. constrain such d12 < 10×10−25e cm d24 14×10−25e 95% C.L. The result translates into limit energy scale this type violation effect level εLV > 1010 GeV.
I. Altarev(), S. Chesnevskaya(), W. Feldmeier(), P. Fierlinger(), A. Frei(), E. Gutsmiedl(), F. Kuchler(), Link(), T. Lins(), M. Marino(), Paul(), G. Petzoldt(), Pichlmaier(), R. Stoepler(), Stuiber(), B. Taubenheim() () Physikdepartment Technische Universitat Munchen and Excellence-Cluster ’Universe’ Munchen, Forschungsneutronenquelle Heinz Maier-Leibnitz (FRM II)
Polarized nuclei are a powerful tool in nuclear-spin studies and the search for physics beyond standard model. Systems which compare two nuclear species have thus far been limited by anomalous yet reproducible frequency variations of unknown origin. We studied self-interactions $^{3}\mathrm{He}\ensuremath{-}^{129}\mathrm{Xe}$ system independently addressing, controlling, measuring influence each component polarization. Our results directly rule out prior explanations shifts demonstrate...
A fast-switching, high-repetition-rate magnet and power supply have been developed for operated at TRIUMF, to deliver a proton beam the new ultracold neutron (UCN) facility. The facility possesses unique operational requirements: time-averaged current of 40~$\mu$A with ability switch on or off several minutes. These requirements are in conflict typical operation mode TRIUMF cyclotron which delivers nearly continuous multiple users. To enable creation UCN facility, beam-sharing arrangement...
Permanent electric dipole moments (EDM) of fundamental systems are promising to find new CP violation beyond the Standard Model. Our EDM experiment is based on hyper-polarized liquid xenon droplets sub-millimeter size a micro-fabricated structure, placed in low-field NMR setup. Implementation rotating fields enables conceptually measurement technique, allowing thorough investigation systematic effects. Still, Ramsey-type spin precession with static field can be realized at similar...
We report results of a new technique to measure the electric dipole moment $^{129}$Xe with $^3$He comagnetometry. Both species are polarized using spin-exchange optical pumping, transferred measurement cell, and transported into magnetically shielded room, where SQUID magnetometers detect free precession in applied magnetic fields. The result from one week campaign 2017 2.5 2018, combined detailed study systematic effects, is $d_A(^{129}\mathrm{Xe}) = (1.4 \pm 6.6_\mathrm{stat}...
The TRIUMF Ultra-Cold Advanced Neutron (TUCAN) collaboration aims at a precision neutron electric dipole moment (nEDM) measurement with an uncertainty of 10 -27 e•cm, which is orderof-magnitude better than the current nEDM upper limit and enables us to test Supersymmetry.To achieve this precision, we are developing new high-intensity ultracold (UCN) source using super-thermal UCN production in superfluid helium (He-II) spectrometer.The development status them reported article.
We describe a new technique to measure the EDM of $^{129}$Xe with $^3$He comagnetometry. Both species are polarized using spin-exchange optical pumping, transferred measurement cell, and transported into magnetically shielded room, where SQUID magnetometers detect free precession in applied electric magnetic fields. The result one week run combined detailed study systematic effects is $d_A(^{129}\mathrm{Xe}) = (0.26 \pm 2.33_\mathrm{stat} 0.72_\mathrm{syst})\times10^{-27}~e\,\mathrm{cm}$....
Searches for permanent electric dipole moments (EDMs) of fundamental particles, atoms and molecules are promising experiments to constrain potentially reveal beyond Standard Model (SM) physics. A non-zero EDM is a direct manifestation time-reversal (T) violation, and, equivalently, violation the combined operation charge-conjugation (C) parity inversion (P). Identifying new sources CP can help solve puzzles SM, e.g., observed baryon-asymmetry in Universe. Theoretical predictions magnitudes...