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The pulse generator described works as a combined switch and series current regulator and allows the shape of the current pulse to be adjusted at each optical wavelength to produce a flat pulse of monochromatic light.
A new kind of magnetic mass spectrometer is described. It consists of ( n ) magnetic prisms integrated into a single pole piece and ( n −1) mirrors which return the beam from one prism to the other. It is shown that by an appropriate choice of the parameters of the apparatus the resolving power...
In electron probes or scanning electron microscopes equipped with energy dispersive spectrometers the acceleration potential can be measured to better than 80 eV by observing the energy corresponding to the short x‐ray wave‐length cutoff λ swl on a cathode ray tube. The intensity in the...
An in‐beam spectrometer system has been modified to allow Coulomb excitation Mössbauer measurements in a back scattering geometry, rather than the usual transmission arrangement. Mössbauer scattering measurements with the 122.6 keV γ rays of 186 W are presented and compared with the results...
A recirculating liquid nitrogen cooling system for optically pumped solid state lasers is described. It has been used to obtain cw emission from YAG:Nd 3+ and ABC‐YAG at 1.06 and 2.09 μ, respectively. The system is versatile and can easily accommodate intercavity components such as an acoustic...
A small, stainless steel, Roots‐type pump for gases is described. The pump employs helium leak tight rotary seals which render it suitable for use in ultrahigh vacuum gas handling systems. A throughput (at atmospheric pressure) of 100 liters∕min has been measured at 1800 rpm. At higher rpm's,...
A technique is described for constructing hot‐wire anemometer probes suitable for measuring turbulence in hypersonic wind tunnels. The main element of the technique is the use of liquid gold resinate for attaching extremely fine hot wires to the probe prongs. Probes mounting wires as small as...
The Lovelace aerosol particle separator (LAPS) provides a continuous separation of aerosol particles in the micron and submicron size ranges according to their aerodynamic equivalent diameters. This new device uses the principle of centrifugal separation of particles in a spinning spiral duct....
The design of an improved Cranz‐Schardin high‐speed camera is presented and its application illustrated in a study of crack propagation. The camera, though simple and relatively inexpensive, is shown to provide adequate accuracy for studies in the field of dynamic photomechanics.
The design of a three element piezoelectric microparticle impact sensing diaphragm is described which is sensitive to the detection of momentum propagated by the bending wave. The design achieves a sensitivity of 3×10 −7 dyn⋅sec and optimizes the detection of the direct‐path pulse from...
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