kyle.ryan@LIGO.ORG - posted 17:34, Wednesday 13 July 2011 (1051)
Started turbo, QDP80 and purge air compressors at X-mid
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.
R. Lane, A. Ramirez Set up OSEMS and performed a diagonalization procedure,using ambient noise as a basis (see https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=1039). Took a Transfer Function using DTT between Main Chain Right OSEM (as channel A) and Main Chain Left OSEM. Switched out the Left OSEM with each other OSEM one-at-a-time, recording a transfer function with each OSEM swap. Results are saved on the SVN ( ~/sus/trunk/QUAD/H2/ITMY/SAGM0/Data/ and ~/sus/trunk/QUAD/H2/ITMY/SAGR0/Data/).
H2 Sus and Electronics Team Sus team was running a diagonalization procedure when we discovered that the TF was showing that we were not driving the suspension at all. With help, we tracked down that the Binary Input/Output was not switching, and B I/O monitors were showing no change to any request sent by the user. We tried all channels enabled, just the test channels, just the LP channels, and each channel one at a time. Nothing changed on the monitor bits and nothing changed to enable a drive signal to pass through. R. McCarthy confirmed that cables and hardware are set up correctly. Model appears to be set up correctly as well. Any help would be greatly appreciated.
R. Lane, B. Bland, A. Ramirez Set up QPD on optical table and took an ambient Spectra of ITMY L3.
The dust monitor at location 3 in the LVEA has been put inside the ISI LVEA test stand clean room. I was surprised to find that it did not have an intake nozzle attached, and attached one. I would therefore not trust its previous readings since the last time it was moved. I believe it was moved there when the previous one at that location had a sensor fail. I also measured the flow rate, and it was less then .1 cfm. I adjusted it to .1 cfm.
BSCISI#1
The clean/in-vacuum cables were connected to the interface boards, and much of the external/dirty cabling has been connected as well.
Finally put weights on this assembly (we first had unusable iLIGO HAM weights out there, and had to get some iLIGO BSC weights craned over). With the forklift we were able to squeeze/slide these masses on top of the Keel---space is limited here when the cleanrooms are in place. We also put on smaller weights around the assembly as well.
Wanted to balance the system using the Capacitive Position Sensors, but we found out there was a wiring/electronics issue. So no balancing attempted.
BSCISI#2
On 6/30, the system was floated, but an overall twist in the system (order of 0.030" seen on dial indicators) was observed. To address this, last week we swapped out the Flexures and re-floated. Once again a twist was observed (about the same order and it was a counterclockwise [looking from top] twist). We will let Fabrice know about this and then come up with a plan for where to go next.
BSCISI#3
The Stage0 Bottom is on the Granite Table and all of its helicoils have been installed.
Misc.
Working with Scott and Ed, HAM 9 was leveled and each support tube brought between 24 and 20 thousands of an inch above their final value to deal with expected settling. HAM 9 is now ready for actuator installation and final positioning of the springs.
HAM 10 has had the East end cross-beam installed but not put into final position yet. The West end cross-beam will be loaded on first and then both will be squared up and put into nominal position with relation to the support tubes.
A few of the clamp caps have required modification. The holes were not tapped deep enough for a 2-d helicoil causing the end of the helicoil to bind with the bolt. Thanks to a great idea from Tyler, tapping the helicoil shaved down the tail enough to have the bolt move through smoothly.
Kyle, Gerardo Put viewport covers on (2) squeezer viewports (South door HAM4). Also, I was notified ~ 1hr into the rough pumping that the Vertex EH2600 roots pump was smelling "hot" -> I discovered that I had not opened the chilled water lines to this pump before running it -> I cracked open both lines and noted that the return line was hotter than normal. I made a few iterations of slightly increasing the cooling water flow, followed by waiting several minutes, then slightly increasing flow, waiting etc... After ~30 minutes of this exercise the pump temps returned to normal.
Jeff B. and Andres R. completed the assembly of the TMS Top Stage blade cartridges. They are currently undergoing the 100°c creak bake for 168 hours.
Travis finished the 8th weld on the practice setup in the Fiber lab yesterday. Today, he annealed the welds, but then had a fiber broke during release of the mass. He suspects a brushing of one of the fibers in the fiber cutter. Eh.
