Parts you need to build your own launcher !

B1= 9V battery for triggering
C1 and C2= 2200uF 250V capacitor
D1= 800V 10 A bridge rectifier
L1= electromagnetic coil (100mohm resistance, 246µH inductance)
R1= 50 ohm 40watt resistor (charging)
R3= 1 K ohm ½ watt resistor (triggering)
S1= 600V 100A SCR
SW1= push button switch
T1= Variac
R2= 200 K ohm ¼ watt resistor (bleeder/balancing)
D2= 100A free wheeling diode
P1= Ferromagnetic projectile (12 gm weight)