Sno Valley performed spring cleaning of the X end station chillers. Chiller 1 and CWP1 were turned on and Chiller 2 and CWP2 was turned off. Sno Valley will be out tomorrow to perform maint. at Y end. Changed AHU3 prefilters on 7/14/11 Pettibone forklift has new steering tires installed
The Support Tubes are chocked in place--a small step in T1000627. The Support Tubes are lowered into cradles (chocks) by lowering the external scissors tables. They are then secured, strapped down if you will, with wire cables to lugs on the chamber wall. After the external support structure is next removed, further securing of the Support Tubes will then be done on the outside of the chamber. Thanks to Mark, Nicole, Chris and JimW
The Apollo Welders are working out the routing for the HEPI Plumbing on the West side of BSC8. Attached are a couple of photos. First the main lines are coming from the East under the chamber and turning up to a valve. This is the West side of BSC8. The lines then turn horizontal to a manifold. The 1" lines branch out to four 1/2" lines that then run over to the "corner" of the chamber and turn up to head for the HEPI Housing at the top of the Pier. The criss-cross is for supply and returns going to each Pier. The second photo shows the lines running vertically close to the chamber to the left of the View ports and finally turning horizontal again and connecting to the four-way recirculation valves. We hope to have given as much access as possible to the viewports for potential use. Robert has looked over the installation and he isn't concerned about noise. JohnW has blessed it with regard to chamber/spool access. We'll be close to the plumbing when ever the spool is removed and need to be aware of that. We may have interfered with RichardM and cable trays but he wasn't too concerned about dealing with the plumbing/valve plates.
Kyle, Gerardo
Transition to laser safe Richard, S & K Electric: pull innerduct from H2 electronics buildings to MSR BSC7 chamber cleaning Optical lever work Cheryl, Sheila: Remove viewport on south side of HAM4. Take pictures from ISCT4 of POX steering mirror illuminated by flashlight through viewport. Tour by physics students from the Netherlands Transition to laser hazard for squeezer work
I upgraded the H2 systems to the latest 2.3 branch version. This will give team-ISI the new immediate readback feature for the controlled filter modules needed to synchronize digital and analog filters.
Our version of 2.3 had some local mods, which I backed up before the upgrade.
The main surprise from the upgrade was that the slope line in the generated ini files changed from 6.1028e-05 to 6.1035e-04. Since the General Standard ADC has a 40V peak-to-peak range over 64k counts, a simple calculation
40/(1024*64) = 6.1035e-04
shows the new value is correct. This value is used by NDS clients if a count-to-volts conversion is needed. The front end systems use counts only.
HAM 10 now has the HEPI piers, enclosures, and crossbeams installed. The support tubes have not been leveled yet but will be today.
The west side lifted up when the crossbeam was placed first on the east side. I think this could be reduced by clamping the crossbeam down while it is still supported by the crane. This, however, would monopolize even more time with the crane. It has been possible to adjust the height with the set screws on the HEPI foot, but this has been fairly difficult and the screws bind occasionally. So the less height adjustment needing to be done from the foot the better.
In order to facilitate the removal of BSC4's dome I relocated the purge air connection from BSC4's dome to HAM9. I had to remove the 10" CFF blank located on the lower right of the West door of HAM9 and install a Class A 10"-2.75" zero length reducer in its place. This reducer is labled as "interim" and is held on by only (3) bolts.
activities throughout the day in the LVEA: cleaning out in the LVEA chamber cleaning in BSC 7 mass levelling on the BSC build #1 on the test stand 9:00 - Filiberto out to check seismic channels out in LVEA 9:00 - Gregorio out to Mid-Y for measurements 1:00 - stonewell electric 2:00 - Swageloc delivery for Hugh
Plot of Beam Tube module pressure with small ion pump, 6 days trend.
Opened GV8*Hard-closed GV14*Dumped GV20 gate annulus accumulated gas into aux. cart*Opened GV20*Finished opening GV15 then hard-closed GV15 -> At this point X1 hydrogen is being pumped by temporary 75 l/s ion pump connected to CP2's 1.5" purge valve and X2 hydrogen is being pumped by IP12
CP4 and CP8 were filled today
I measured the flow rates of dust monitors 5, 7 and 9 in the LVEA using the Top Trak flow meter model no. 822-13-OV1 PV1-V1 serial no. 46313. The flow rate should read .1 scfm. The measured flow rates were location 5: .095 scfm location 7: .028 scfm location 9: .087 scfm With the dust monitors turned off, the flow measured -.005 scfm. I could not adequately adjust the flow rate on location 7 and 9 to .1 scfm. I was able to readjust it back to ~ .1 scfm on location 5. I have removed locations 7 and 9 from the LVEA. Further measurements need to be done on the remaining dust monitors in the LVEA.
Gary brought this up at a recent SUS meeting, but today, I am back in the lab paying closer attention to it: We continue to fight the fact that the jaw on the wire clamps want to swivel in the slop of the through holes when we lock them down, creating an "over hang" of the jaw (see picture of the BSFM one we are working on). I know for iLIGO, people were concerned about this interface as a rubbing noise source. As well, Gary pointed out that it can rear itself in a form of differential pitch when in wire pairs. I'm not sure if this is a noise problem, but heads up with this nice picture. (Note, we tried very hard to clamp the jaw while holding it against the torque that the head of the screw induced, but to no avail.) I think we should at least use washers here - I've placed an order for a batch to try.
Kyle, Gerardo, John Soft-closed GV8. Connected 75 l/s ion pump to purge valve of CP2. PT134B in "alarm" as the result of the reduced hydrogen pumping speed of this configuration. Calculations imply pressure indicated by PT134B should level off at ~ 5 x 10-7 torr. Alarm setpoint for beam tube and cryopump cold-cathode gauges (i.e. PT134B) is 1 x 10-7 torr. This experiment is motivated by a desire to vent the X-mid station while the XBM is also vented. There would be no nominal ion pumps available to pump hydrogen from X1 with both of these volumes valved-out simultaneously.
Chamber cleaning work continues throughout the day in BSC 7. 9:15 - Gregorio at mid-y 11:00 kyle and Gerardo to soft close a gate valve mid columbia forklift 11:45 1:45 – Mike L. and Gerardo to check out beam baffle in LVEA Kyle informed the control room that the channel PT 134 B will alarm once the value drops below 1e8 torr. This level is expected and the alarm can be ignored for now. The alarm level will need to be changed to prevent the trigger.
