Jonathan Lee

Continuous coherent spin-frequency metrology in storage rings via resonant beam-driven detection

Younggeun Kim, Themis Bowcock, Dmitry Budker, G. Cantatore et autres

Precision measurements in storage rings are increasingly limited by the ability to monitor collective spin dynamics coherently over long time scales. Existing polarimetry techniques rely on destructive scattering processes that preclude continuous, non-intercepting tracking of spin evolution and constrain both statistical sensitivity …

Continuous coherent spin-frequency metrology in storage rings via resonant beam-driven detection

Younggeun Kim, Themis Bowcock, Dmitry Budker, G. Cantatore et autres

Precision measurements in storage rings are increasingly limited by the ability to monitor collective spin dynamics coherently over long time scales. Existing polarimetry techniques rely on destructive scattering processes that preclude continuous, non-intercepting tracking of spin evolution and constrain both statistical sensitivity …

gb, it, us, tr, ru (code pays fourni par la source)

Possible Self-Arresting Screening Current Stress Damage in a REBCO Test Coil At 42.6 T in 31 T Background Field

Jonathan Lee, Jeseok Bang, Garfield Murphy, Griffin Bradford et autres

REBCO coated conductors (CCs) have now been optimized for current-carrying capacity in high magnetic fields. Production-length CCs may carry more than 1500 A at 4.2 K/30 T in the B//ab configuration. Such highIcis essential for the construction of new generations of ultra-high …

jp, us (code pays fourni par la source)

Optimizing injection for the storage ring proton-EDM experiment

Jonathan Lee, H. Huang, Francois Meot, W. Morse et autres

The proposed proton electric dipole moment (pEDM) experiment at Brookhaven National Laboratory (BNL), to be built inside the alternating gradient synchrotron (AGS) tunnel, aims to measure the proton’s electric dipole moment with a sensitivity of 10 − 29 e cm . This …

us, kr, ca (code pays fourni par la source)

Status of the Proton EDM Experiment (pEDM)

V. Anastassopoulos, Grigor Atoian, S. Baeßler, F. Bedeschi et autres

The Proton EDM Experiment (pEDM) is the first direct search for the proton electric dipole moment (EDM) with the aim of being the first experiment to probe the Standard Model (SM) prediction of any particle EDM. Phase-I of pEDM will achieve $10^{-29} …

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Evidence that transverse variability of critical current density can greatly mitigate screening current stress in high field REBCO magnets

Jeseok Bang, Jonathan Lee, Griffin Bradford, Kwangmin Kim et autres

, where RE=rare earth) coated conductors by screening current stress (SCS) is a significant concern for ultra-high-field superconducting magnets. Indeed, the third Little Big Coil (LBC3), a REBCO magnet that generated a record, high field of 45.5 T, showed wavy plastic damage …

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Elastic-plastic conductor damage evaluation at over 0.4% strain using a high-stress REBCO coil

Jeseok Bang, Griffin Bradford, Kwangmin Kim, Jonathan Lee et autres

Abstract Recent reports on screening current stress simulations of high-field REBCO magnets frequently present peak stresses over 1 GPa. However, this result is probably an unrealistic artifact of purely elastic calculations, considering the macroscopic yield and fracture stresses of approximately 900 MPa …

us (code pays fourni par la source)

Assessing the Accuracy of Lithium Contents Determined by Combined Quantitative Backscattered Electron and X-ray Energy Dispersive Spectroscopy Analysis

Davd Stowe, Jonathan Lee, René de Kloe, Julia Mausz et autres

Lithium- (Li-) based materials and products have gained significant commercial importance due to their widespread utilization in applications such as battery technologies and aerospace alloys. However, to understand and optimize properties of these materials, it is highly desirable to determine the elemental …

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Self-healing mechanisms for Ge–Sb–S chalcogenide glasses upon gamma irradiation

Myungkoo Kang, Byoung‐Uk Sohn, Qingyang Du, Danhao Ma et autres

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The Effect of Field-Dependent $n$-Value on Screening Current, Voltage, and Magnetic Field of REBCO Coil

Jeseok Bang, Kwangmin Kim, Griffin Bradford, Jonathan Lee et autres

Here we report the effect of field-dependent index value$n(B,\theta)$on screening current and consequential NI REBCO coil behavior. Through the ‘Little Big Coil (LBC)’ framework, an unexpected voltage behavior has been observed at the top and bottom coils in the fourth mini magnet …

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An experimental study to investigate magnetic field and winding force-dependent contact resistance of NI REBCO coil

Jeseok Bang, Griffin Bradford, Jonathan Lee, Dmytro Abraimov

Abstract This paper reports the magnetic field and winding force-dependent contact resistance, also known as characteristic resistance, of no-insulation (NI) REBCO coil. Three NI coils were wound with different winding forces ( < 1 kgf, 3 kgf, and 5 kgf) using the …

us (code pays fourni par la source)

Time Evolution of the Mass of Primordial Black Holes in a Cosmic Microwave Background with a Time-Dependent Temperature

Jonathan Lee

Primordial black holes have been long theorized to exist, with their formation predicted to have been a short time after the Big Bang.In this paper, we discuss the different properties of primordial black holes, such as the possibility of primordial black holes …

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