This is the casing for my Cloud chamber. I used Snowman LGA115X1200-1366-775, but you can use any cooler with active cooling pad of size 40 mm × 49 mm. For cooling I used TEC2-25408. There is also a place for high voltage power supply (I used DC 3.7V to 1800V Booster Converter Step Up Module Arc Pulse DC Motor with High Voltage Capacitors). You might want to also add On/Off toggle switch.