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Jul 1978

Volume 49, Issue 7, pp. 891-1015

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Compact electron‐beam source for formation of neutral beams of very low vapor pressure materials

J. A. Rutherford and D. A. Vroom

Rev. Sci. Instrum. 49, 1008 (1978); http://dx.doi.org/10.1063/1.1135487 (3 pages) | Cited 1 time

Online Publication Date: 8 August 2008

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An electron‐beam heater and associated power supply have been developed for use in formation of metal vapors for neutral beam studies. The device is small with relatively low power (250 W). It is easily constructed and designed such that the target surface is normal to the direction of propagation of the neutral beam. Beams of tantalum atoms and carbon particles have been formed using the device.
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29.27.-a Beams in particle accelerators

Versatile electrical feedthrough for probe measurements in vacuo

D. N. Spector, J. D. Sethian, and K. A. Gerber

Rev. Sci. Instrum. 49, 1010 (1978); http://dx.doi.org/10.1063/1.1135508 (2 pages) | Cited 1 time

Online Publication Date: 8 August 2008

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An electrical feedthrough, operating at 10−6 Torr, for use in vacuum systems utilizing Swagelock or Wilson‐type seals is described. It features a pair of center conductors with a coaxial shield and can be used with a variety of detachable probes.
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07.30.Kf Vacuum chambers, auxiliary apparatus, and materials
07.55.-w Magnetic instruments and components

Tuned limiter for receiver amplifier in a fast‐recovery pulsed NMR spectrometer

Harold T. Stokes

Rev. Sci. Instrum. 49, 1011 (1978); http://dx.doi.org/10.1063/1.1135509 (2 pages) | Cited 11 times

Online Publication Date: 8 August 2008

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A simple tuned limiter is described which limits the rf voltage amplitude at the input of the receiver amplifier of a pulsed NMR spectrometer. This device prevents overload of the receiver amplifier during the high‐power rf pulse and thereby allows fast recovery of the spectrometer following the pulse. When used with Avantek unit amplifiers at 24 MHz, a recovery time of 2.5 μs is achieved.
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07.57.Pt Submillimeter wave, microwave and radiowave spectrometers; magnetic resonance spectrometers, auxiliary equipment, and techniques

’’Wonderstone’’ ENDOR cavity

V. P. Chacko

Rev. Sci. Instrum. 49, 1012 (1978); http://dx.doi.org/10.1063/1.1135510 (3 pages)

Online Publication Date: 8 August 2008

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We report the design and construction of a high‐quality ENDOR cavity from a naturally occurring rock, ’’Wonderstone.’’ It consists of a cylindrical cavity operated in the TE011 mode, with four vertical posts forming the ENDOR coil. 100 kHz field modulation is achieved by external coils mounted on the pole faces of the magnet. This cavity is especially suited for the insertion of a cold‐finger Dewar. The merits of Wonderstone as a substrate material for microwave cavities and the details of obtaining a fine conducting layer of silver on the inner surface of the cavity are discussed.
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07.57.Pt Submillimeter wave, microwave and radiowave spectrometers; magnetic resonance spectrometers, auxiliary equipment, and techniques
76.70.Dx Electron-nuclear double resonance (ENDOR), electron double resonance (ELDOR)

Hemispherical dielectric permittivity cell

Joseph S. Hayden and John G. Berberian

Rev. Sci. Instrum. 49, 1014 (1978); http://dx.doi.org/10.1063/1.1135488 (2 pages) | Cited 2 times

Online Publication Date: 8 August 2008

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A three‐terminal dielectric cell based on a hemispherical design is constructed for low‐temperature measurements of dielectric permittivity. The cell has a small sample volume, is geometrically stable, and shows no frequency dependence of capacitance. Measurements on test samples are presented showing both cell constant stability data and the linearity of measured capacitance with dielectric constant.
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77.22.Ch Permittivity (dielectric function)
06.60.Ei Sample preparation (including design of sample holders)
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