We're not looking for super high-vacuum though are we? Maybe we can get away with borrowing the small turbo pumping station from the suspensions lab to pump it down and then we can just valve it off.
Also, we have the cylinder head for a tank of helium now so we should order in a tank to try that (the tanks get delivered really fast so that shouldn't be a problem). Of course we'll at least need windows before doing that.
I've asked Gina to check on the CVI W2 window order. The order went in on 22nd July and CVI said that they had them in stock.
I think that's right - we won't need any better than 1 mTorr. As long as there is no huge leak, we should be fine. It would be handy to have a (EPICS trendable) gauge on the system so that we can know if its leaking.
The system's total volume will be ~20 liters. So we need the leak rate to be below ~1e-6 Torr-liters / hour. A suggestion from Mike Z is to use the usual flexi-hosing from Norcal instead of the rigid nipple type of tube
I was talking about before. flexi hose link ..... I think we can use the 2" ID, 24" long tubes and make up for the difference in the length in the corner chambers. The length of each side of the gyro should be 29.5" with a 100 MHz FSR.