Electromagnetic Accelerator Improvements Part II

Update 9/5/2021 - STL Files in link below:
https://drive.google.com/file/d/150P90fzySc2uXoxUL0e2ZlGPpEaGcZzJ/view?usp=sharing

In this video I make a new version of my ring accelerator that's capable of propelling steel balls 15 times faster than my first design. This is the second part in a series about improving accelerator coils

Here's some technical specs:

Input voltage: 24V
Number of coils: 4
Wire Gauge: 24AWG

Coil Current: 13A
Coil ID: 1.1"
Coil OD: 1.4"
Coil Length: 0.5"
Coil turns: 200

The final outer diameter is ~2" due to the addition of steel wire to create a magnetic flux guide or "shell".

FET Type: IRLZ44N
On time: ~8 ms at max. speed
Energy input per pulse: 2.6J

Ball mass: 65 grams
Ball kinetic energy: ~0.52J

Part I:
https://www.youtube.com/watch?v=OIw1JiMGHlw

Previous Accelerator design:
https://www.youtube.com/watch?v=qfmv-rHK_RU&t=2s

Music:
Serge Pavkin - Fractal
https://www.youtube.com/watch?v=8CFs1bVmCAg
Serge Pavkin - Tech
https://www.youtube.com/watch?v=cNnYlaF183I
Serge Pavkin - Unknown