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Feb 2013

Volume 84, Issue 2, Articles (02xxxx)

Issue Cover Spotlight Figure

Rev. Sci. Instrum. 84, 021101 (2013); http://dx.doi.org/10.1063/1.4789314 (14 pages)

Alexey Goncharov

Typical permanent magnet electrostatic plasma lens, characteristically about 15 cm long and 10 cm inner diameter. The magnets are shown in black between grey spacers. A set of cylindrical ring electrodes are located within the magnetic field region, with field lines connecting ring electrode pairs symmetrically about the lens midplane.

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back to top Gravity; Geophysics; Astronomy and Astrophysics

Tracking geomagnetic fluctuations to picotesla accuracy using two superconducting quantum interference device vector magnetometers

S. Henry, E. Pozzo di Borgo, and A. Cavaillou

Rev. Sci. Instrum. 84, 024501 (2013); http://dx.doi.org/10.1063/1.4790715 (6 pages)

Online Publication Date: 15 February 2013

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SQUIDs can be used to monitor the three vector components of the geomagnetic field to a high precision at very low frequencies, yet as they are susceptible to external interference, the accuracy to which they can track changes in the dc field over long periods has been unclear. We have carried out simultaneous measurements of the geomagnetic field recorded using two independent 3-axis SQUID magnetometers at the Laboratoire Souterrain à Bas Bruit (LSBB). We demonstrate a technique to take the difference between a linear transform of the three signals from one magnetometer, and a reference signal from the other, in order to account for any difference in alignment and calibration, and track local signals at a sub-nT level. We confirmed that both systems tracked the same signal with an RMS difference as low as 56pT over a period of 72 h. To our knowledge this is the first such demonstration of the long term accuracy of SQUID magnetometers for monitoring geomagnetic fields.
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85.25.Dq Superconducting quantum interference devices (SQUIDs)
06.20.fb Standards and calibration
07.55.Ge Magnetometers for magnetic field measurements

Efficient graphite ring heater suitable for diamond-anvil cells to 1300 K

Zhixue Du, Lowell Miyagi, George Amulele, and Kanani K. M. Lee

Rev. Sci. Instrum. 84, 024502 (2013); http://dx.doi.org/10.1063/1.4792395 (5 pages)

Online Publication Date: 22 February 2013

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In order to generate homogeneous high temperatures at high pressures, a ring-shaped graphite heater has been developed to resistively heat diamond-anvil cell (DAC) samples up to 1300 K. By putting the heater in direct contact with the diamond anvils, this graphite heater design features the following advantages: (1) efficient heating: sample can be heated to 1300 K while the DAC body temperature remains less than 800 K, eliminating the requirement of a special alloy for the DAC; (2) compact design: the sample can be analyzed with in situ measurements, e.g., x-ray, optical, and electrical probes are possible. In particular, the side access of the heater allows for radial x-ray diffraction (XRD) measurements in addition to traditional axial XRD.
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07.35.+k High-pressure apparatus; shock tubes; diamond anvil cells
61.72.Dd Experimental determination of defects by diffraction and scattering
07.20.-n Thermal instruments and apparatus
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