The pressure measurement systems and diagnostics are described, and gas analysis and composition are presented for multiple anode materials. For all testing, an aluminum cathode is used. A low impedance Marx generator, with no intermediate pulse forming apparatus, is used to drive the vircator. If the ohm-meter reads a finite resistance, that means the diode is conducting a small current in the forward direction, and the red + + + plus lead from the meter is touching the anode. The second treatment omits the high temperature bake-out. The first being a high temperature bake-out under vacuum (10-7 Torr) followed by an ultrasonic cleaning. For Nickel, two anodes are machined and given different treatments before operation in the sealed vircator. Strange indeed that Diodes Incorporated datasheet does not contain the words 'cathode' or 'anode'. The test materials include stainless steel, copper tungsten, tantalum, nickel,molybdenum, and oxygen-free high-conductivity copper. Multiple anode materials have been tested, with measurements made of both the quantity and types of gases evolved during firing. A residual gas analyzer (RGA) and pressure measurements have been used to perform characterization of background gases before and after the operation of the vircator. Gases are known to evolve both from processes at the cathode, such as explosive electron emission, and anode processes such as heating by the electron beam. BAW56QA - Dual common anode high-speed switching diode encapsulated in a leadless ultra small DFN1010D-3 (SOT1215) Surface-Mounted Device (SMD) plastic. The gas evolved during the operation of a virtual cathode oscillator (vircator), which can be detrimental to the maximum output power, repetition rate, and pulse width was studied.
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