3.3 Ohmic Bucket Design Three different sizes of ohmic bucket coils were designed, built and tested. The first one used had an = 0.514 and both coils were wound on a GIO tube (see APPENDIX I). This was of integral construction to minimize mass. This proved to be troublesome. When a coil burned out the other would be still good but the entire bucket would be useless. A modular design then was made so that all parts could be interchanged and mass produced for rapid testing (see Fig. 3.1). Later ohmic buckets were built with 's = 0.63 and 0.65 to improve coupling and a reduced mass was attempted in these designs. The basic parameter of these ohmic buckets are given in Table 3.2. Table 3.2 Ohmic Bucket Parameters Tests were performed to measure the bucket coil resistance after removal from the liquid nitrogen and are given in Table 3.3. This shows that a test firing should happen within 15 seconds from removal of the ohmic bucket from liquid nitrogen and placed in the injector.
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