Mass Driver 2 Final Report Part 1 - NASA/SSI

fired through Mass Driver Two. Since this was the largest permissable diameter bucket coil, it was a close fit and it failed on the first test. The leading coil caught the edge of the vacuum jacket for the decelerator and the bucket was destroyed. No experimental results of performance are available. Theoretical performance for this ohmic bucket with a more realistic mass and two different bucket coil currents at nominal sector capacitor voltage are given in Tables 6.1 and 6.2. The output parameters for these tables and all others later to come are: NF - firing number VCI - initial sector capacitor voltge (V) VCF - final sector capacitor voltage (V) DE - energy transferred (J) UOUT - velocity at the completion of the firing (m/sec) ACC - local acceleration for the complete firing (g's) AAVE - average acceleration over all firings (g's) Next, an ohmic bucket with an α = 0.65 was constructed with 4450 turns to give the same current as the α = 0.514 bucket. However, the final bucket would not fit into the vacuum jacket due to rounding of the coil's outer surface. This bucket was abandoned and one with an α = 0.63 was finally made to work. It was essentially the same coil form as the = 0.65 but with fewer turns. this bucket was used for nearly all subsequent testing. Because this ohmic bucket had fewer turns, the capacitor bank was required to have a higher voltage than 800 volts. This lead to the construction of a capacitor bank with the capability of 2100 volts to ensure that 500g's or more would be obtained, even using the α= 0.514 ohmic bucket. Theoretical performance for this ohmic bucket with nearly the same mass as was obtained (12gms low) for two different operating conditions

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