6.2 Test Firing Results During the design and construction of the subsystems for Mass Driver Two a considerable amount of testing was performed. This effort was primarily for the debugging of circuits to eliminate ground loops and circuit interactions. The various circuits that were checked out included the: optical sensors, trigger circuits, SCR trigger circuits, SCR feeder strips and SCR's, drive coil assembly, firing simulator, reset and indication circuitry, low voltage power supply filter and fusing, fan in circuit, current transformers, voltage divider circuits, power supplies (low and high voltage) and control circuits, voltage monitoring circuits, safety and remote control circuits, sector capacitors, recharg- ng capacitors and control circuitry, ohmic buckets, ohmic bucket capacitor and control circuitry, and injector. All of these circuits were required to fire an ohmic bucket with recharging through the 1.25m accelerator section safely and routinely with diagnostics. Some preliminary tests were performed in late summer 1979 when the ohmic bucket first became operational. These early tests were done with primitive diagnostics (no Nicolet digital oscilloscope for one) and no recharging. Injector velocities of 10-15 m/sec were obtained but observation of any velocity increase after one drive coil firing was uncertain. This was due to the use of several storage oscilloscopes to observe transitions in the optical trigger circuitry. Reliable results had to wait for the installation of the fan-in circuitry which combined the SCR trigger pulses from one phase onto a single line that could be recorded. After this long period of construction and debugging, Mass Driver Two was finally made to work. Results of the last 14 tests as power levels were being increased with all circuits operating are now presented. Full power tests of the complete system at the nominal design
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