Hello everyone  , Kaizer ivited me here via youtube coment to show our recent creation - two big Tesla coils.
The construction of these two coils was carried out for 1 month.
Some features:
Coil height 3.3m
The diameter of the toroid 2m
Secondary coil is 315x1600mm (wire 1.2mm)
The secondary coil is coated with a special black epoxy (50kV / mm)

Toroid is made of aluminum tubes with a diameter of 25mm. It took 2 days and work of 3 people to create one. Its diameter is 2 meters. Weight is about 35kg.

For preventing of breakdown and ionization from the primary winding and the strike ring, it was decided to make the spherical primary winding a 7/8" copper pipe.

Well, the most interesting:
Resonant frequency is 35kHz
The power part is a dual H-bridge, made of infenion FZ900 IGBTs, (1800A 1200v)
MMC - 1.1 uf 20kv special Russian (Soviet standard) military capacitors made for personal order (5x220nf 20kv)
OCD limited at 3800A (in the future we want to set 10000A)
DC capacitors: 15000uf 1000V
In the future we will make PFC for 200 kW (380VAC to 800VDC)
Each coil consumes about 35kW of power from 3 phase mains 380VAC

Our driver based on CPLD

The maximum spark reaches 7.5m.
We dont have suitable power supply to use both of them at maximum power.

Videos:

More photos can be found on the Russian high-voltage forum. http://flyback.org.ru/viewtopic.php?t=8406&postdays=0&postorder=asc&start=0
If interested, I can show other photos