Curriously, IP1 and IP2 indicate a 4-channel sum of ~1.6mA @ ~7000V while IP3 and IP4 indicate a 4-channel sum ~4mA @ ~7000V (15 minutes after changing valve status') and their respective controllers.
chandra.romel@LIGO.ORG - 09:27, Tuesday 22 October 2019 (52617)
I ran a few hours today with only IP14 pumping on HAM6 to see if shutting down the turbo+backing cart would be an option (Daniel S. keen on elilminating noise). The pressure looked like it might "turn the corner" at 5 or 6 x 10-6 torr but I aborted the exercise in observance of our default policy of not sacrificing equipment life expectancy. HAM6 back on turbo only until further notice.
kyle.ryan@LIGO.ORG - 18:35, Tuesday 22 October 2019 (52631)
Curriously, IP1 and IP2 indicate a 4-channel sum of ~1.6mA @ ~7000V while IP3 and IP4 indicate a 4-channel sum ~4mA @ ~7000V (15 minutes after changing valve status') and their respective controllers.
Any correlation with chevron baffles? I can't remember which IPs have them and which don't.
1105 hrs. local -> Valved-out Vertex Turbo
I ran a few hours today with only IP14 pumping on HAM6 to see if shutting down the turbo+backing cart would be an option (Daniel S. keen on elilminating noise). The pressure looked like it might "turn the corner" at 5 or 6 x 10-6 torr but I aborted the exercise in observance of our default policy of not sacrificing equipment life expectancy. HAM6 back on turbo only until further notice.
Sorry C for the late response - I think that IP1 and./or IP2 have UV baffles while IP3 and IP4 do not.
Update - I noted that this disparity remained even after valving-out the Vertex turbo later on.