Commissioning the Muon g-2 Experiment Electrostatic Quadrupole System

Crnkovic, Jason; Badgley, Karie; Yucel, Esra Barlas; Grange, Joseph; Herrod, Alexander; Holzbauer, J. L.; Nguyen, H. H.; Ramberg, E.; Sanders, Howard J.; Tishchenko, V. G.; Tran, N.; Wu, W.; Yücel, M.

doi:10.18429/jacow-ipac2018-wepaf015

Cited by 2 publications

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“…After traversing one quarter of the SR, the beam is deflected by a fast pulsed-kicker magnet system [6] onto the intended storage orbit. Four electrostatic quadrupole (ESQ) sections [7] installed symmetrically around the ring confine the beam vertically. The Run-1 data, collected in 2018, are grouped into four datasets (a-d) corresponding to four different kicker magnet and ESQ voltage combinations.…”

Section: Introductionmentioning

confidence: 99%

Beam dynamics corrections to the Run-1 measurement of the muon anomaly $a_{\mu}$ at Fermilab

Lucà¹

2022

Proceedings of the 22nd International Workshop on Neutrinos From Accelerators — PoS(NuFact2021)

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The Fermi National Accelerator Laboratory (FNAL) Muon 𝑔 − 2 Experiment has measured the positive muon magnetic anomaly 𝑎 𝜇 ≡ (𝑔 𝜇 − 2)/2 with a precision of 0.46 parts per million, with data collected during its first physics run in 2018. The experimental result combined with the measurement from the former experiment at Brookhaven National Laboratory increases the tension with the Standard Model expectation to 4.2𝜎, thus strengthening evidence for new physics. The magnetic anomaly is determined from the precision measurements of the muon spin precession frequency, relative to the muon momentum, and the average magnetic field seen by the beam. In an ideal case with muons orbiting in a horizontal plane with a uniform vertical magnetic field, the anomalous precession frequency 𝜔 𝑎 is given by the difference between the spin (𝑠) and cyclotron (𝑐) frequencies, 𝜔 𝑎 = 𝜔 𝑠 − 𝜔 𝑐 . The observable 𝜔 𝑎 is proportional to 𝑎 𝜇 . This proceeding presents the beam dynamics systematic corrections that are required to adjust the measured muon precession frequency 𝜔 𝑚 𝑎 to its true physical value 𝜔 𝑎 .*** The 22nd International Workshop on Neutrinos from Accelerators (NuFact2021) ***

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Section: Introductionmentioning

confidence: 99%

Beam dynamics corrections to the Run-1 measurement of the muon anomaly $a_{\mu}$ at Fermilab

Lucà¹

2022

Proceedings of the 22nd International Workshop on Neutrinos From Accelerators — PoS(NuFact2021)

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“…Five to fifteen microseconds later the plate voltages were returned to a symmetric configuration with a 5 µs time constant, centering the beam in the storage region [5,18].This procedure removed particles near the aperture and significantly reduced muon losses from the storage ring during the data collection period. In Run 1 of E989, an approximately 7 µs scraping time was used [19]. A major issue with the E821 scraping method is that the beam can move through a resonance while going from the scraping high-voltage configuration to the final symmetric high voltage, causing unwanted muon losses.…”

Section: B Introduction To the Cbo Reduction Simulation Strategymentioning

confidence: 99%

Reduction of coherent betatron oscillations in a muon g − 2 storage ring experiment using RF fields

et al. 2020

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The muon g − 2 experiments store a beam of polarized muons in a weak focusing storage ring. As the ensemble of muons goes around the ring, their spin precesses, and when they decay through the weak interaction: µ + → e + νeνµ the decay positrons are detected by electromagnetic calorimeters. In addition to the expected exponential decay in the positron time spectrum, the weak decay asymmetry causes a modulation in the number of positrons in a selected energy range at the difference frequency between the spin and cyclotron frequencies, ωa. This frequency is directly proportional to the magnetic anomaly a = (g − 2)/2, where g is the gyromagnetic ratio of the muon, which is slightly greater than 2. The detector acceptance depends on the radial position of the muon decay, so the coherent betatron oscillations of the muon bunch following injection into the storage ring amplitude modulates the measured muon signal with the frequency ωCBO. Applying radio frequency (RF) electric fields has the potential to significantly decrease the beam CBO, and additionally to scrape the beam to reduce muon losses from the storage ring during the measurement period. Preliminary tests showed significant CBO amplitude reduction.

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Commissioning the Muon g-2 Experiment Electrostatic Quadrupole System

Cited by 2 publications

References 0 publications

Beam dynamics corrections to the Run-1 measurement of the muon anomaly $a_{\mu}$ at Fermilab

Beam dynamics corrections to the Run-1 measurement of the muon anomaly $a_{\mu}$ at Fermilab

Reduction of coherent betatron oscillations in a muon g − 2 storage ring experiment using RF fields

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