The failure mechanism was determined to be tin whiskers emanating from the tin plating on the internal pins. The high conductivity, pure tin crystalline whiskers bridged the 10-mil spark gap to cause the test failures. The fusing current of the whiskers was in the range of the source current of the test equipment. This caused inconsistencies during problem identification and verification at the...

Attempts have been made in this laboratory to compare the biological action of the soft or low frequency and the hard or high frequency x-rays, but the impossibility of comparing doses of the two types of rays with our present apparatus and measuring devices has rendered the results of these studies of little value. However, by varying the doses of the soft and hard rays there is one point whic...

Diffuse discharge opening switches usually operate with gas mixtures containing attachers when short opening times are desired. For arc free discharge 1nitiation, a preionization source should produce a sufficient electron density at the time when the voltage rises across the discharge. Therefore, a preionizer must have 1) a short rise and fall time, 2) sufficient power, and 3) a sufficiently p...

EDM is an unconventional electro thermal machining process used for manufacturing geometrically complex or hard material parts that are extremely difficult-to-machine by conventional machining process. The process involves a controlled erosion of electrically conductive materials by the initiation of rapid and repetitive spark discharges between the tool and work piece separated by a small gap ...

A supercritical (SC) nitrogen (N2) switch is designed and tested. The dielectric strength and recovery rate of the SC switch are investigated by experiments. In order to theoretically study the discharge and recovery process of the SC N2 switch under high repetition rate operation, a numerical model is developed. For SC N2 with initial parameters of p = 80.9 bar and T = 300 K, the simulation re...

A pulsing circuit is designed and constructed capable of raising up to +6.7kV between plates of a small (~50cm side length) spark chamber. The device is triggered by the ~2V output of a cosmic ray detection device, and its overall gain of ~1:3000 is achieved by a sequence of amplifiers and fast switching devices – namely a Bipolar Junction Transistor (BJT), Insulated Gate Bipolar Transistor (IG...

The aim of the work is to study influence length spark gap on energy input into discharge channel during its gas-dynamic expansion. Methodology. research carried out by numerical modeling process development at variable values and invariable other conditions. was set in range from 1 mm 20 mm. conducted using a model development, which takes account processes nonstationary expansion channel, tra...