Technique for Measuring Megagauss Magnetic Fields Using Zeeman Effect

Garn, W.B.; Caird, R.S.; Thomson, D.B.; Fowler, C.M.

doi:10.1063/1.1720316

Cited by 36 publications

(11 citation statements)

References 5 publications

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“…At that time parallel measurements had been carried out to fields only as high as 2 MG, with Faraday rotation or Zeeman splitting measurements of well-known materials used for the companion measurement. Somewhat later Garn et al (20) obtained a calibration at 5.1 MG, by measuring the Zeeman splitting of the sodium D lines.…”

Section: Measurement Of Megagauss Fieldsmentioning

confidence: 99%

Megagauss Physics

Fowler

1973

Science

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Fields greater than 10 MG can be produced by explosive flux compression and fields up to 3 MG with capacitor banks. Measurement of fields up to 10 MG is reliable, but difficulties may be expected at higher fields. Megagauss fields have been applied successfully as high-pressure sources, in high-energy particle physics, and in solid-state investigations. Other uses remain to be exploited: plasma compression by megagauss fields has been relatively unsuccessful but shows promise; their use as particle accelerators has been studied only theoretically; and much work remains to be done, both experimentally and theoretically, in connection with applications of megagauss fields in solidstate physics. Note added in proof: Since this article was prepared, Grigor'ev et al. have carried out some experiments (48) in which they have compressed hydrogen up to a density of 1.95 grams per cubic centimeter with a calculated pressure of 8 x 10(6) atmospheres. They report five different pressure-density points and claim that their data can be explained by assuming that the transition to the metallic phase occurs at a pressure of 2.8 x 10(6) atmospheres, with a density change from 1.08 to 1.3 g/cm(3). Using the flux compression techniques described earlier in this article, Hawke et al. [see (30, 31)] have obtained a pressure-density point at 1.5 x 10(6) atmospheres and 1.0 g/cm(3), which is also not inconsistent with a predicted equation of state of metallic hydrogen (49). In view of the experimental uncertainties, none of the pressure-density data can yet be used conclusively to establish the transition's existence. Hawke and his co-workers are presently engaged in measurements of the electrical conductivity of the compressed hydrogen. Observation of a significant conductivity at the proposed transition pressure would be a more definitive test of a metallic transition. In addition, two lower pressure-density points have been obtained for deuterium by the Los Alamos group, by means of the flux compression methods described earlier in this article. One point agrees to within experimental error with a slight extrapolation of Stewart's data (50). The second point is at a pressure of 65+/- 3 x 10(3) atmospheres with a density of 0.71 +/- 0.10 g/cm(3). The data are tentative, and efforts are under way to obtain more data points at both higher and lower pressures.

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Section: Measurement Of Megagauss Fieldsmentioning

confidence: 99%

Megagauss Physics

Fowler

1973

Science

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“…This accuracy is orders of magnitude better of the one quoted in previous high magnetic field studies of atoms [9][10][11][12]. None of these previous investigations at very high magnetic fields has included the diamagnetism in their analysis.…”

Section: Rubidium Atomic Constantsmentioning

confidence: 62%

Pulsed high magnetic field measurement with a rubidium vapor sensor

George

Bruyant

Béard

et al. 2017

Review of Scientific Instruments

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We present a new technique to measure pulsed magnetic fields based on the use of rubidium in gas phase as a metrological standard. We have therefore developed an instrument based on laser inducing transitions at about 780 nm (D2 line) in rubidium gas contained in a mini-cell of 3 mm × 3 mm cross section. To be able to insert such a cell in a standard high-field pulsed magnet, we have developed a fibred probe kept at a fixed temperature. Transition frequencies for both the π (light polarization parallel to the magnetic field) and σ (light polarization perpendicular to the magnetic field) configurations are measured by a commercial wavemeter. One innovation of our sensor is that in addition to the usual monitoring of the light transmitted by the Rb cell, we also monitor the fluorescence emission of the gas sample from a volume of 0.13 mm. Our sensor has been tested up to about 58 T.

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“…There is the matter of most methods used to obtain large fields being destructive in their nature, thus complicating the experimental reproducibility. In such experiments, the Zeeman splitting of energy levels in alkalimetal atoms is used to observe field strengths of the order of tens/hundreds of Tesla via spectroscopic techniques [32][33][34]. Non-destructive techniques for producing * francisco.s.ponciano-ojeda@durham.ac.uk these large fields also exist, and this has enabled work in large pulsed magnetic fields up to 58 T with similar alkaliatom systems [35,36].…”

Section: Introductionmentioning

confidence: 99%

Absorption spectroscopy and Stokes polarimetry in a $^{87}$Rb vapour in the Voigt geometry with a 1.5 T external magnetic field

Ponciano-Ojeda,

Logue,

Hughes

2020

Preprint

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Technique for Measuring Megagauss Magnetic Fields Using Zeeman Effect

Cited by 36 publications

References 5 publications

Megagauss Physics

Megagauss Physics

Pulsed high magnetic field measurement with a rubidium vapor sensor

Absorption spectroscopy and Stokes polarimetry in a $^{87}$Rb vapour in the Voigt geometry with a 1.5 T external magnetic field

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