Ok so it's been a minute, but there is still some movement on this project... Here are some of my thoughts on the plan for the inside look of the pack.
Designed in 1984 by Egon Spengler and Ray Stantz, the Proton Pack counters the negative energy that ghosts are made of with a Proton Stream, a stream of positively charged ions that can harness a ghost. The Proton Stream is very dangerous and barely controllable. Also referred to as a charged particle accelerator, functions by using a miniature cyclotron to concentrate protons by channeling through a "positron collider" and then to the neutrona wand, emitting a way-fire positronic ionized stream of proton energy that polarizes with the negatively charged ectoplasmic entities which held them in the stream so they can be captured with the ghost trap.