| Capacitor (MMC) |
| I am using 100x10kV Ceramic Capacitors, 0.001uF (off memory) wired as 25 strings of 4 giving 0.025uF@40kv. 26/3/2001: Capacitors arrived from California, checked them for damage. 27/3/2001: Drilled holes in cutting board and fitted capacitors ready for soldering, also realized something I overlooked, 1/2w resistors won't be able to handle 4000 volts. 28/3/2001: Bert Hickman suggested an unusual approach to bleeding the MMC. Since mine has strings of only 4 capacitors, the centre rail could be earthed back to the NST's for bleeding, it will also eliminate losses from using resistors. Another approach might be to leave the 'centre rail' of the MMC as purely a way of safely discharging it. It really depends on how cheaply I can get High Tension cable. I am also reluctant, from a safety point of view, to have a mains earth connect to the main assembly. One of my design rules was to have as complete as possible isolation from the mains. 29/3/2001: Soldered the capacitors and bus-bars, ready to go in. Just need to get more EHT cable @ $5/m. 21/4/2001: Mounted the MMC into the main coil assembly, ready to wire.. 29/4/2001: Soldered the bleed resistors into 2 strings of 3x16 for 56m@ roughly 9kV I will mount them in plastic pipes with screw fittings so they can't arc to anything. 12/6/2001: Resister strings have been mounted in pipes and fitted to the frame. EHT wiring is now complete. |
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