A fast non-ferric kicker for the muon (g−2) experiment

Efstathiadis, E.; Lee, Y.Y; Mi, J.; Pai, C.; Paley, J.; Roberts, B. L.; Sanders, R.; Semertzidis, Yannis K.; Warburton, D.

doi:10.1016/s0168-9002(02)01627-3

Cited by 29 publications

(12 citation statements)

References 9 publications

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“…We built two Faraday magnetometers to measure this transient, one similar to the one used in E821 [65] and the other substantially improved against vibrations caused by the pulsing systems, which we are going to describe next. Such magnetometers exploit the rotation of the polarization angle θ of linear polarized light that occurs in almost any isotropic dielectric in a magnetic field B parallel to the light propagation direction ∆θ(t) = V B(t)L.…”

Section: Measurementmentioning

confidence: 99%

Magnetic Field Measurement and Analysis for the Muon g-2 Experiment at Fermilab

Albahri,

Anastasi,

Badgley

et al. 2021

Preprint

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The Fermi National Accelerator Laboratory (FNAL) Muon g −2 Experiment has measured the anomalous precession frequency a µ ≡ (g µ −2)/2 of the muon to a combined precision of 0.46 parts per million with data collected during its first physics run in 2018. This paper documents the measurement of the magnetic field in the muon storage ring. The magnetic field is monitored by nuclear magnetic resonance systems and calibrated in terms of the equivalent proton spin precession frequency in a spherical water sample at 34.7 °C. The measured field is weighted by the muon distribution resulting in ω p , the denominator in the ratio ω a /ω p that together with known fundamental constants yields a µ . The reported uncertainty on ω p for the Run-1 data set is 114 ppb consisting of uncertainty contributions from frequency extraction, calibration, mapping, tracking, and averaging of 56 ppb, and contributions from fast transient fields of 99 ppb.

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Section: Measurementmentioning

confidence: 99%

Magnetic Field Measurement and Analysis for the Muon g-2 Experiment at Fermilab

Albahri,

Anastasi,

Badgley

et al. 2021

Preprint

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“…The requirements on the fast muon kicker are rather stringent. While electric, magnetic, and combination electromagnetic kickers were considered, the collaboration settled on a magnetic kicker design [72] because it was thought to be technically easier and more robust than the other options. Because of the very stringent requirements on the storage ring magnetic field uniformity, no magnetic materials could be used.…”

Section: The Fast Muon Kickermentioning

confidence: 99%

Muon (g − 2): experiment and theory

2007

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A review of the experimental and theoretical determinations of the anomalous magnetic moment of the muon is given. The anomaly is defined by a = (g −2)/2, where the Landé g-factor is the proportionality constant that relates the spin to the magnetic moment. For the muon, as well as for the electron and tauon, the anomaly a differs slightly from zero (of order 10 −3 ) because of radiative corrections. In the Standard Model, contributions to the anomaly come from virtual 'loops' containing photons and the known massive particles. The relative contribution from heavy particles scales as the square of the lepton mass over the heavy mass, leading to small differences in the anomaly for e, µ, and τ . If there are heavy new particles outside the Standard Model which couple to photons and/or leptons, the relative effect on the muon anomaly will be ∼ (m µ /m e ) 2 ≈ 43 × 10 3 larger compared with the electron anomaly. Because both the theoretical and experimental values of the muon anomaly are determined to high precision, it is an excellent place to search for the effects of new physics, or to constrain speculative extensions to the Standard Model. Details of the current theoretical evaluation, and of the series of experiments that culminates with E821 at the Brookhaven National Laboratory are given. At present the theoretical and the experimental values are known with a similar relative precision of 0.5 ppm. There is, however, a 3.4 standard deviation difference between the two, strongly suggesting the need for continued experimental and theoretical study.

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“…Furthermore, with a properly matched load impedance, reflections from the unterminated conductors are exploited in Blumleins to promptly end the electrical pulse. In BNL E821, the RLC PFN generated a primary pulse that exceeded 450 ns and engulfed the cyclotron structure of the muon beam [1,10]. We selected the Blumlein PFN design specifically to improve the timing characteristics of the kicker pulse, the duration of which is shown in Eq.…”

Section: Blumlein Pulsersmentioning

confidence: 99%

“…These devices are crucial for operations, but they do not directly measure the magnetic field. We constructed a Faraday magnetometer to evaluate the kicker-induced field amplitude and waveform shape in a similar manner to the procedure described in Section 4 of [10].…”

Section: Field Studymentioning

confidence: 99%

The fast non-ferric kicker system for the Muon $g-2$ Experiment at Fermilab

Schreckenberger,

Allspach,

Barak

et al. 2021

Preprint

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We describe the installation, commissioning, and characterization of the new injection kicker system in the Muon g − 2 Experiment (E989) at Fermilab, which makes a precision measurement of the muon magnetic anomaly. Three Blumlein pulsers drive each of the 1.27-m-long non-ferric kicker magnets, which reside in a storage ring vacuum (SRV) that is subjected to a 1.45 T magnetic field. The new system has been redesigned relative to Muon g − 2's predecessor experiment, and we present those details in this manuscript.

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A fast non-ferric kicker for the muon (g−2) experiment

Cited by 29 publications

References 9 publications

Magnetic Field Measurement and Analysis for the Muon g-2 Experiment at Fermilab

Magnetic Field Measurement and Analysis for the Muon g-2 Experiment at Fermilab

Muon (g − 2): experiment and theory

The fast non-ferric kicker system for the Muon $g-2$ Experiment at Fermilab

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