Karie Badgley

Fermi National Accelerator Laboratory

*This is an algorithmically generated author record based on publicly available information.

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Fermi National Accelerator Laboratory

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Karie Badgley has a total of 229 co-authors. Here are the top co-authors by number of shared publications:

A. Chapelain
Cornell University
3 shared publications
A. E. Tewsley-Booth
University of Kentucky
3 shared publications
A. Lorente Campos
University of Kentucky
3 shared publications
Aaron T. Fienberg
University of Washington
3 shared publications
Adam L. Lyon
Fermi National Accelerator Laboratory
3 shared publications
Adam Paul Schreckenberger
Fermi National Accelerator Laboratory
3 shared publications

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- 3 December 2025
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Applied Superconductivity
Mechanical Design of the PIP-II ORBUMP Pulsed Dipole Magnet
by D. Karas, K. Badgley, Z. Chen, V. Chernenok, M. Davidson, D. Harding, D. Johnson, V. Kashikhin, W. Robotham, T. Strauss, et al.
The Proton Improvement Plan II (PIP-II) project is a vital upgrade to the Fermilab accelerator complex. The magnet pulse rate of the PIP-II Injection system requires an increase from the current rate of 15 Hz to 20 Hz as well as a roughly 30% increase in the magnetic field of the new Orbital Bump (ORBUMP) pulsed dipole magnets in the Booster. The ORBUMP magnet mechanical design is presented in this paper. The ORBUMP magnet is secured in a vacuum box and the core is made up of 0.127 mm thick, low carbon steel laminations with a C-5 inorganic magnesium phosphate coating. The core is clamped using external tie bars welded to the core end plates. ANSYS Finite Element Analysis (FEA) was used to evaluate the clamping design to minimize the deflection of the core post welding of the tie bars. The water-cooled, single turn coil, which shapes the magnetic field by acting as the pole tips, is critical for the integrated field homogeneity. The coil manufacturing tolerances and fabrication techniques were evaluated to ensure the magnetic properties of the magnet could be obtained. The coil is electrically isolated from the core using virgin Polyether ether ketone (PEEK) insulating material in the gap. An investigation into the high voltage performance of the virgin PEEK insulator was conducted via partial discharge testing using a 1:1 scale sample.
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- 3 December 2025
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Applied Superconductivity
Mechanical Design of the PIP-II ORBUMP Pulsed Dipole Magnet
by D. Karas, K. Badgley, Z. Chen, V. Chernenok, M. Davidson, D. Harding, D. Johnson, V. Kashikhin, W. Robotham, T. Strauss, et al.
The Proton Improvement Plan II (PIP-II) project is a vital upgrade to the Fermilab accelerator complex. The magnet pulse rate of the PIP-II Injection system requires an increase from the current rate of 15 Hz to 20 Hz as well as a roughly 30% increase in the magnetic field of the new Orbital Bump (ORBUMP) pulsed dipole magnets in the Booster. The ORBUMP magnet mechanical design is presented in this paper. The ORBUMP magnet is secured in a vacuum box and the core is made up of 0.127 mm thick, low carbon steel laminations with a C-5 inorganic magnesium phosphate coating. The core is clamped using external tie bars welded to the core end plates. ANSYS Finite Element Analysis (FEA) was used to evaluate the clamping design to minimize the deflection of the core post welding of the tie bars. The water-cooled, single turn coil, which shapes the magnetic field by acting as the pole tips, is critical for the integrated field homogeneity. The coil manufacturing tolerances and fabrication techniques were evaluated to ensure the magnetic properties of the magnet could be obtained. The coil is electrically isolated from the core using virgin Polyether ether ketone (PEEK) insulating material in the gap. An investigation into the high voltage performance of the virgin PEEK insulator was conducted via partial discharge testing using a 1:1 scale sample.
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Cited by 121
- 9 July 2025
- Published by American Physical Society (APS) in Physical Review Letters
Measurement of the positive muon anomalous magnetic moment to 127 ppb
by D. P. Aguillard, T. Albahri, D. Allspach, J. Annala, K. Badgley, S. Baeßler, I. Bailey, L. Bailey, E. Barlas-Yucel, T. Barrett, et al.
A new measurement of the magnetic anomaly a μ of the positive muon is presented based on data taken from 2020 to 2023 by the Muon g − 2 Experiment at Fermi National Accelerator Laboratory (FNAL). This dataset contains over 2.5 times the total statistics of our previous results. From the ratio of the precession frequencies for muons and protons in our storage ring magnetic field, together with precisely known ratios of fundamental constants, we determine a μ = 1 165 920 710 ( 162 ) × 10 − 12 (139 ppb) for the new datasets, and a μ = 1 165 920 705 ( 148 ) × 10 − 12 (127 ppb) when combined with our previous results. The new experimental world average, dominated by the measurements at FNAL, is a μ ( exp ) = 1 165 920 715 ( 145 ) × 10 − 12 (124 ppb). The measurements at FNAL have improved the precision on the world average by over a factor of 4.
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- 9 July 2025
- Published by American Physical Society (APS) in Physical Review Letters
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Open Access
Measurement of the positive muon anomalous magnetic moment to 127 ppb
by D. P. Aguillard, T. Albahri, D. Allspach, J. Annala, K. Badgley, S. Baeßler, I. Bailey, L. Bailey, E. Barlas-Yucel, T. Barrett, et al.
A new measurement of the magnetic anomaly a μ of the positive muon is presented based on data taken from 2020 to 2023 by the Muon g − 2 Experiment at Fermi National Accelerator Laboratory (FNAL). This dataset contains over 2.5 times the total statistics of our previous results. From the ratio of the precession frequencies for muons and protons in our storage ring magnetic field, together with precisely known ratios of fundamental constants, we determine a μ = 1 165 920 710 ( 162 ) × 10 − 12 (139 ppb) for the new datasets, and a μ = 1 165 920 705 ( 148 ) × 10 − 12 (127 ppb) when combined with our previous results. The new experimental world average, dominated by the measurements at FNAL, is a μ ( exp ) = 1 165 920 715 ( 145 ) × 10 − 12 (124 ppb). The measurements at FNAL have improved the precision on the world average by over a factor of 4.
Cited by 121
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Cited by 81
- 8 August 2024
- Published by American Physical Society (APS) in Physical Review D
Detailed report on the measurement of the positive muon anomalous magnetic moment to 0.20 ppm
by D. P. Aguillard, T. Albahri, D. Allspach, A. Anisenkov, K. Badgley, S. Baeßler, I. Bailey, L. Bailey, V. A. Baranov, E. Barlas-Yucel, et al.
We present details on a new measurement of the muon magnetic anomaly, $a_{μ} = (g_{μ} - 2) / 2$ . The result is based on positive muon data taken at Fermilab’s Muon Campus during the 2019 and 2020 accelerator runs. The measurement uses $3.1 GeV / c$ polarized muons stored in a 7.1-m-radius storage ring with a 1.45 T uniform magnetic field. The value of $a_{μ}$ is determined from the measured difference between the muon spin precession frequency and its cyclotron frequency. This difference is normalized to the strength of the magnetic field, measured using nuclear magnetic resonance. The ratio is then corrected for small contributions from beam motion, beam dispersion, and transient magnetic fields. We measure $a_{μ} = 116592057 (25) \times 10^{- 11}$ (0.21 ppm). This is the world’s most precise measurement of this quantity and represents a factor of 2.2 improvement over our previous result based on the 2018 dataset. In combination, the two datasets yield $a_{μ} (FNAL) = 116592055 (24) \times 10^{- 11}$ (0.20 ppm). Combining this with the measurements from Brookhaven National Laboratory for both positive and negative muons, the new world average is $a_{μ} (\exp) = 116592059 (22) \times 10^{- 11}$ (0.19 ppm).
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- 8 August 2024
- Published by American Physical Society (APS) in Physical Review D
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Open Access
Detailed report on the measurement of the positive muon anomalous magnetic moment to 0.20 ppm
by D. P. Aguillard, T. Albahri, D. Allspach, A. Anisenkov, K. Badgley, S. Baeßler, I. Bailey, L. Bailey, V. A. Baranov, E. Barlas-Yucel, et al.
We present details on a new measurement of the muon magnetic anomaly, $a_{μ} = (g_{μ} - 2) / 2$ . The result is based on positive muon data taken at Fermilab’s Muon Campus during the 2019 and 2020 accelerator runs. The measurement uses $3.1 GeV / c$ polarized muons stored in a 7.1-m-radius storage ring with a 1.45 T uniform magnetic field. The value of $a_{μ}$ is determined from the measured difference between the muon spin precession frequency and its cyclotron frequency. This difference is normalized to the strength of the magnetic field, measured using nuclear magnetic resonance. The ratio is then corrected for small contributions from beam motion, beam dispersion, and transient magnetic fields. We measure $a_{μ} = 116592057 (25) \times 10^{- 11}$ (0.21 ppm). This is the world’s most precise measurement of this quantity and represents a factor of 2.2 improvement over our previous result based on the 2018 dataset. In combination, the two datasets yield $a_{μ} (FNAL) = 116592055 (24) \times 10^{- 11}$ (0.20 ppm). Combining this with the measurements from Brookhaven National Laboratory for both positive and negative muons, the new world average is $a_{μ} (\exp) = 116592059 (22) \times 10^{- 11}$ (0.19 ppm).
Cited by 81
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Cited by 729
- 17 October 2023
- Published by American Physical Society (APS) in Physical Review Letters
Measurement of the Positive Muon Anomalous Magnetic Moment to 0.20 ppm
by D. P. Aguillard, T. Albahri, D. Allspach, A. Anisenkov, K. Badgley, S. Baeßler, I. Bailey, L. Bailey, V. A. Baranov, E. Barlas-Yucel, et al.
We present a new measurement of the positive muon magnetic anomaly, $a_{μ} \equiv (g_{μ} - 2) / 2$ , from the Fermilab Muon $g - 2$ Experiment using data collected in 2019 and 2020. We have analyzed more than 4 times the number of positrons from muon decay than in our previous result from 2018 data. The systematic error is reduced by more than a factor of 2 due to better running conditions, a more stable beam, and improved knowledge of the magnetic field weighted by the muon distribution, ${\tilde{ω}}_{p}^{'}$ , and of the anomalous precession frequency corrected for beam dynamics effects, $ω_{a}$ . From the ratio $ω_{a} / {\tilde{ω}}_{p}^{'}$ , together with precisely determined external parameters, we determine $a_{μ} = 116 592 057 (25) \times 10^{- 11}$ (0.21 ppm). Combining this result with our previous result from the 2018 data, we obtain $a_{μ} (FNAL) = 116 592 055 (24) \times 10^{- 11}$ (0.20 ppm). The new experimental world average is $a_{μ} (\exp) = 116 592 059 (22) \times 10^{- 11}$ (0.19 ppm), which represents a factor of 2 improvement in precision.
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- 17 October 2023
- Published by American Physical Society (APS) in Physical Review Letters
Top Cited Papers
Open Access
Measurement of the Positive Muon Anomalous Magnetic Moment to 0.20 ppm
by D. P. Aguillard, T. Albahri, D. Allspach, A. Anisenkov, K. Badgley, S. Baeßler, I. Bailey, L. Bailey, V. A. Baranov, E. Barlas-Yucel, et al.
We present a new measurement of the positive muon magnetic anomaly, $a_{μ} \equiv (g_{μ} - 2) / 2$ , from the Fermilab Muon $g - 2$ Experiment using data collected in 2019 and 2020. We have analyzed more than 4 times the number of positrons from muon decay than in our previous result from 2018 data. The systematic error is reduced by more than a factor of 2 due to better running conditions, a more stable beam, and improved knowledge of the magnetic field weighted by the muon distribution, ${\tilde{ω}}_{p}^{'}$ , and of the anomalous precession frequency corrected for beam dynamics effects, $ω_{a}$ . From the ratio $ω_{a} / {\tilde{ω}}_{p}^{'}$ , together with precisely determined external parameters, we determine $a_{μ} = 116 592 057 (25) \times 10^{- 11}$ (0.21 ppm). Combining this result with our previous result from the 2018 data, we obtain $a_{μ} (FNAL) = 116 592 055 (24) \times 10^{- 11}$ (0.20 ppm). The new experimental world average is $a_{μ} (\exp) = 116 592 059 (22) \times 10^{- 11}$ (0.19 ppm), which represents a factor of 2 improvement in precision.
Cited by 729
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- 23 March 2020
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Applied Superconductivity
Status of Performance Testing of the Mu2e Transport Solenoid Coils
by Karie Badgley, Giorgio Ambrosio, Joseph DiMarco, Daniel Evbota, Andy Hocker, Michael Lamm, Vito Lombardo, Thomas Strauss
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- 23 March 2020
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Applied Superconductivity
Status of Performance Testing of the Mu2e Transport Solenoid Coils
by Karie Badgley, Giorgio Ambrosio, Joseph DiMarco, Daniel Evbota, Andy Hocker, Michael Lamm, Vito Lombardo, Thomas Strauss