Leak sealed... or not?

We found and sealed the vacuum leak, but it wasn't in the place we thought it was. In the probe I mentioned, there is a wire that leads into the chamber to create the pulses. The wire is sealed on the outside with the probe casing, but apparently it was not sealed completely at the place where it touches the probe's electrode. That meant that air was leaking through the wire, underneath the insulation. It was sucked through about 10 feet of this wire, all the way until that wire connected with a different wire and the insulation changed. That's why it was so hard to find; the reading on our helium detector wouldn't change until the helium had traveled all the way down this wire, and even then, the place where the air was sucked in was pretty far from our main chamber.

Anyway, my temporary solution was to remove the probe entirely and seal up that opening. We'll probably need to redesign the probe a bit to fix the issue. In the meantime, we are getting low pressures, but I'm not sure what kind of dust clouds we'll be able to produce.

Meanwhile, we have a new leak. When I first sealed the chamber after removing the probe, I was getting very good results, but then I opened up the chamber to move some stuff around and clean the window, and since then I've had this leak. I'm pretty sure it's at the window seal, but I'm having trouble getting rid of it.