Kim Siang Khaw
A5062215212- Particle physics theoretical and experimental studies
- Muon and positron interactions and applications
- Dark Matter and Cosmic Phenomena
- Neutrino Physics Research
- Particle accelerators and beam dynamics
- Particle Detector Development and Performance
- Computational Physics and Python Applications
- High-Energy Particle Collisions Research
- Superconducting Materials and Applications
- Atomic and Subatomic Physics Research
- Atomic and Molecular Physics
- Radiation Detection and Scintillator Technologies
- Scientific Research and Discoveries
- Nuclear physics research studies
- Particle Accelerators and Free-Electron Lasers
- Quantum Chromodynamics and Particle Interactions
- Astrophysics and Cosmic Phenomena
- Cosmology and Gravitation Theories
- Semiconductor materials and devices
- Advanced Semiconductor Detectors and Materials
- Gamma-ray bursts and supernovae
- Nuclear Physics and Applications
- Noncommutative and Quantum Gravity Theories
- Magnetic confinement fusion research
- Astronomy and Astrophysical Research
Shanghai Jiao Tong University
2021-2024
University of Washington
2017-2023
ETH Zurich
2012-2020
Seattle University
2018-2019
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...
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 electric dipole moments~(EDM) of fundamental particles inherently violate parity~(P) and time-reversal~(T) symmetries. By virtue the CPT theorem in quantum field theory, latter also implies violation combined charge-conjugation parity~(CP) symmetry. We aim to measure EDM muon using frozen-spin technique within a compact storage trap. This method exploits high effective field, \$E \approx 165\$ MV/m, experienced rest frame with momentum about 23 MeV/c when it passes through solenoidal...
This paper outlines the design and development of a fast front-end electronic readout board for muon trigger detector in muEDM experiment at Paul Scherrer Institute. The detector, which consists gate aperture is strategically located end superconducting injection channel to generate signals magnetic kicker, activates upon muons into central region storage solenoid. Within field solenoid, system configuration optimized meet stringent performance specifications, including minimal signal...
We report on muonium (Mu) emission into vacuum following μ(+) implantation in mesoporous thin SiO(2) films. obtain a yield of Mu (38±4)% at 250 K and (20±4)% 100 for 5 keV energy. From the energy dependence we determine diffusion constants these films: D(Mu)(250 K)=(1.6±0.1)×10(-4) cm(2)/s D(Mu)(100 K)=(4.2±0.5)×10(-5) cm(2)/s. Describing process as quantum mechanical tunneling from pore to pore, reproduce measured temperature ∼T(3/2) constant. extract potential barrier (-0.3±0.1) eV which...
This letter of intent proposes an experiment to search for electric dipole moment the muon based on frozen-spin technique. We intend exploit high field, $E=1{\rm GV/m}$, experienced in rest frame with a momentum $p=125 {\rm MeV/}c$ when passing through large magnetic field $|\vec{B}|=3{\rm T}$. Current fluxes at $μ$E1 beam line permit improved sensitivity $σ(d_μ)\leq 6\times10^{-23}e{\rm cm}$, about three orders magnitude more than current upper limit $|d_μ|\leq1.8\times10^{-19}e{\rm...
We have developed a custom amplifier board coupled to large-format 16-channel Hamamatsu silicon photomultiplier device for use as the light sensor electromagnetic calorimeters in Muon g-2 experiment at Fermilab. The calorimeter absorber is an array of lead-fluoride crystals, which produces short-duration Cherenkov light. detector sits high magnetic field muon storage ring. SiPMs selected, and their accompanying electronics, must preserve short pulse shape, quantum efficiency, be...
A $10\text{ }\text{ }\mathrm{MeV}/c$ positive muon beam was stopped in helium gas of a few mbar magnetic field 5 T. The ``swarm'' has been efficiently compressed from length 16 cm down to mm along the axis (longitudinal compression) using electrostatic fields. simulation reproduces low energy interactions slow muons gas. Phase space compression occurs on order microseconds, compatible with lifetime $2\text{ }\ensuremath{\mu}\mathrm{s}$. This paves way for preparation high-quality low-energy...
We demonstrate efficient transverse compression of a 12.5 MeV/c muon beam stopped in helium gas target featuring vertical density gradient and crossed electric magnetic fields. The stop distribution extending vertically over 14 mm was reduced to 0.25 size (rms) within 3.5 μs. simulation including cross sections for low-energy μ^{+}-He elastic charge exchange (μ^{+}↔ muonium) collisions describes the measurements well. By combining stage with previously demonstrated longitudinal stage, we can...
The debate about how antimatter or different systems behave gravitationally will be ultimately decided by experiments measuring directly the acceleration of various probes in gravitational field Earth perhaps redshift effects atoms caused annual variation Sun's potential at location Earth. Muonium may used to probe interaction leptonic, second generation antimatter. We discuss progress our work towards enabling such with muonium.
We propose an evolution of the Mu2e experiment, called Mu2e-II, that would leverage advances in detector technology and utilize increased proton intensity provided by Fermilab PIP-II upgrade to improve sensitivity for neutrinoless muon-to-electron conversion one order magnitude beyond providing deepest probe charged lepton flavor violation foreseeable future. Mu2e-II will use as much infrastructure possible, providing, where required, improvements apparatus accommodate beam cope with...
We report the achievement of spatial confinement muonium atoms (the bound state a positive muon and an electron). Muonium emitted into vacuum from mesoporous silica reflects between two ${\mathrm{SiO}}_{2}$ confining surfaces separated by 1 mm. From data, one can extract that reflection probability on kept at 100 K is about 90% process well described cosine law. This technique enables new experiments with this exotic atomic system very important step towards measurement $1S\ensuremath{-}2S$...
The PSI low-energy μSR spectrometer is an instrument dedicated to muon spin rotation and relaxation measurements. Knowledge of the beam parameters such as spatial, kinetic energy arrival-time distributions at sample position are important ingredients analyze spectra. We present here measured losses in thin carbon foil start detector deduced from time-of-flight Muonium formation (10 nm thickness) also affect measurable decay asymmetry therefore need be accounted for. detector, whose relevance...
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 explore a model of dark matter (DM) that can explain the reported discrepancy in muon anomalous magnetic moment and predict large electric dipole (EDM) muon. The contains DM fermion new scalars whose exclusive interactions with radiatively generate observed mass. Constraints from direct indirect detection experiments as well collider searches are safely evaded. parameter space gives abundance explains $g-2$ anomaly leads to EDM $d_{\mu} \simeq (4$-$5) \times 10^{-22} \, e {\rm cm}$ be...
We present an apparatus for detection of cyclotron radiation yielding a frequency-based β^{±} kinetic energy determination in the 5 keV to 2.1 MeV range, characteristic nuclear β decays. The frequency radiating particles magnetic field is used determine precisely. Our work establishes foundation apply emission spectroscopy (CRES) technique, developed by Project 8 Collaboration, far beyond 18-keV tritium endpoint region. report initial measurements β^{-}'s from ^{6}He and β^{+}'s ^{19}Ne...
The search for a permanent electric dipole moment (EDM) of the muon is an excellent probe physics beyond Standard Model particle physics.We propose first dedicated EDM employing frozen-spin technique at Paul Scherrer Institute (PSI), Switzerland, with sensitivity 6 × 10 -23 e • cm, improving current best limit set by E821 experiment Brookhaven National Laboratory more than three orders magnitude.In preparation high precision to measure EDM, several R&D studies have been performed PSI:...
The presence of a permanent electric dipole moment in an elementary particle implies Charge-Parity symmetry violation and thus could help explain the matter-antimatter asymmetry observed our universe. Within context Standard Model, particles is extremely small. However, many Model extensions such as supersymmetry predict large moments. Recently, muon has become topic particular interest due to tensions magnetic anomaly electron, hints lepton-flavor universality B-meson decays. In this...