Thomas R. Carver

A Simply Constructed Proton NMR Probe for High Field Super‐conducting Solenoid Calibration

A proton nuclear resonance probe for high field calibration of room temperature access superconducting solenoid fields is described. The probe may be made in a simple fixed‐tuned version, or a tunable version to cover the range from about 40 to 70 kG. Such a probe has the advantage that it may be used on the end of a long probe stem, may be made quite small if necessary, has a high Q, may be used to calibrate homogeneity and persistence easily, may be tested prior to use with DPPH, and may be constructed in just a few hours. The probe can be adapted to use at liquid helium temperatures utilizing 3He samples.

Imaging electrometer capable of low temperature operation

A device is described which can produce images of small, low mobility (low energy) negative electric currents. The device can map the cross section of an impinging current density as small as −10−13 A⋅cm−2 with a spatial resolution of 102 points per mm2. The charge carriers need an electrostatic energy of only ∼1 eV to be detected. A device for room temperature operation is easily constructed. With some modifications the device can operate at temperatures as low as 1 K.

Practical Differential Filter for Optical Pumping with Sodium Light

Opitcal orientation of alkali metal vapors by polarized resonance radiation may be enhanced by reducing the intensity of the D/sub 2/ component relative to the D/sub 1/ intensity (NSA 11: 603; 12: 5456). A simple method to filter out the scdiunn D/sub 2/ light by more than a magnitude, without reducing the D/sub 1/ intensity much more than the usual amount necessary to form circularly polarized light, uses the different Zeeman splittings of the two D lines in a sodium vapor absorption cell placed in a magnetic field to open a transmission window in the center of the Di line, while still absorbing strongly in the center of the D/sub 2/. (L.N.N.)