Re: I'm a newbie coiler!- twin coil phase drifting

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: Steve Conner <steve@xxxxxxxxxxxx>


My question was
addressing what happens once the primary quenches (should be at
maximum energy in the secondary). I'm thinking that phase drifting
begins at this moment in time if not before.

Remember there is huge capacitive coupling between the two 
resonators, so they can't be treated as independent even if the bases 
aren't connected. I've got twin coils to work with just one primary, 
and the "slave" secondary not connected in any way and just driven 
via capacitive coupling between the toploads. I could get breakout 
from either resonator alone, or both, by tuning the DRSSTC driver.

The one thing I couldn't do was get the streamers to connect, though 
they were long enough. They didn't avoid each other, but just passed 
by each other. That suggests that the capacitive coupling gives a 90 
degree phase shift between the two resonators, and you need twin 
primaries and/or the secondary bases connected together to allow the 
desired 180 degree mode.

I was able to get my single primary system to run and give connecting 
arcs by connecting the secondary bases together, but it suffered 
badly from primary-secondary flashovers.

Note, there is also a 0 degree mode (what a vibration analyst would 
call the "rolling mode") which is the one where the streamers seem to 
actively avoid each other. This mode is suppressed if you only 
connect the secondary bases to each other and not to ground, but that 
carries the risk of flashovers. I keep meaning to try grounding the 
secondary bases through a bank of power resistors, to keep the 
voltage under control and damp the rolling mode without affecting the 
wanted one.


Steve Conner