The H2 BS LOS was removed. All the optics were removed from HAM10. fb0w was restarted and should be writing frames. Corey started cleaning up the seismic equipment removed from HAM 8 & 9.
The H2 BS LOS was removed. All the optics were removed from HAM10. fb0w was restarted and should be writing frames. Corey started cleaning up the seismic equipment removed from HAM 8 & 9.
We deinstalled all optics from HAM10. Main things were output Faraday, three sets (one AS and two POs) of beam reducing telescope, periscopes, and beam handling mirrors. These were all inventoried by Dani. Faraday, AS periscope and AS beam handling mirrors were stored in one of the ISC/squeezer cabinets, others are still on the table near HAM8/9. AS telescope is on the table by HAM8/9 under the clean room, but the PO telescopes are left on the support table of HAM9 because we didn't have any room outside to put them down. We accessed HAM10 from HAM9 through BSC4. The picture taken from BSC4 shows Matt and Rodney working in HAM10.
There were several long fibers dangling from the upper table of BS in BSC4. They looked as if they were ripped off of bunny suits. After all these years out-gasing, probably they've become ultra high vacuum compatible lints (but this time let's not repeat this). Pictures show two particularly long ones. I took one sample out of chamber but it was somehow lost during moving things around.
- Jim, Corey, Zach, Rodney, Cheryl Beamsplitter LOS was removed - BSC4 is now empty.
- Jim, Mitchell, Jodi, Zach, Rodney, Patrick, Cheryl Removed all beam dumps and steering mirrors from BSC4. All items were moved from BSC4 through HAM9 and out of the vacuum system. H2 beamsplitter was removed and placed in a "cake tin." There was a small hitch in securing the optic when the black rubber on one of the three support legs seemed to get in the way - issue resolved by looking at an ITM cake tin and seeing that the black rubber on that one was zip tied out of the way.
8:50 – Squeezer laser ON 13:30 – Jodie and crew out to BSC4 to remove H2 beam splitter ~4:00 – crew is finished with the de-install of the beam splitter. Squeezer laser is still on at 4:00pm with the crew.
(Andres, Corey, Dale (photog),Jeff, Travis, Rodney, Zach) During Thanksgiving week, the HAM8 & HAM9 in-vacuum optical tables had their payloads removed (i.e. MC2, MMT2, RM, telescope, etc.). HAM9 SEI Passive Stack Removal On Tues, the HAM9 Passive Stack (Optical table, masses, & springs) was removed. Everything was removed up to the Support Table; it was kept in to maintain a rigid connection of the Support Tubes (until HEPI is installed). For this Passive Stack removal, we did so with only one HAM door off. This only proved to be an issue for removing the HAM Leg Screws on the Masses which were on the side of the HAM away from the open door. To get to the other side of the chamber, one had to rock climb over a corner of the Optics Table to get into the tube between HAM9 & BSC4 & then climb over another corner of the Optics Table to get on the "back side" of the HAM. HAM Screws were removed from this side (ribbon cable was also "cut" so as not to interfere with anything upon removal of the Optics Table). So this maneuver set us back an extra 30 min. After this, it was smooth sailing. Lifting up the Optics Table was interesting. The all the viton seats were really pressed up against all the metal such that as we lifted the Optics Table everything stuck together for a few seconds and then noticeably bounced as soon as all the viton unstuck itself. The Optics Table & Masses were all set directly on the floor in the North end of the LVEA. HAM9 work probably occurred from 8:30-10:45. We could have continued with HAM8, but rumors of nasty winter weather (Hanford was having an early release), led us to hold off HAM8 until Wed. We did do some staging for HAM8 since we were inside HAM9. The Baffle in between HAM8/9 was removed. This was so we could climb to the back of HAM8 and remove its Leg Screws. HAM8 SEI Passive Stack Removal With our veteran crew and the staging from Tuesday, HAM8 went even smoother. We were roughly in the chamber from 8:50-9:45. So, with HAM9's stack removed, there is clear access to BSC4/HAM10. Our HAM9/8 material is all in the LVEA North Bay and is ready to be removed. Since none of it is subscribed, we will lay it all outside for pick-up by the recyclers.
The road to Y-end and mid stations is very good. The chiller yards are clear to drive to and check and all is okay.
The MEDM Vacuum snapshot is not viewable as of 17:00. john
I used Foton to add 10:0.4 filters to each of the UI and PEN OSEM input channels on the quad test stand to compensate for the hardware whitening filter in the satellite boxes. (Such filters were already in place on the top mass OSEMs, so I just copied the definition across.) They should be left enabled from here on.
fb0w continues to reset itself, it appears to have started on Friday. Restarted ldasgw0, which had sam errors, but couldn't remount frames on it, and I don't have the password for root. The machine running the ioc for fmcs (control9) got restarted. For some reason I thought running checkcds set the fmcs alarms, but it does not. Instead I had to run /cvs/cds/project/fmcs/set_Minor_Severity.pl and /cvs/cds/project/fmcs/AlarmSetFmcs.csh on control9 (a Solaris box). However the following remain, but not on the alarm handler anymore: H0:FMC-CS_OSB_AH_CLDDECKTEMP_DEGC alarmed high at 16.41 deg C H0:FMC-CS_LVEA_ZONE3B_D_DEGC alarmed low at 18.26 deg C The H2 RM was craned over the beam tube.
PID values accumulated during stuck needle valve period taking too long to clear. CP1 as low as 65% full yet PID output still at minimum value (5% for CP1) -> Came in and filled CP1 in manual mode. Changed PID parameters to expedite clearing out of accumulated values then restored nominal PID parameters. PID should be current and assume control.
CP1 and (to a lesser degree) CP2 have been slowly overfilling since early Tuesday afternoon -> I investigated today and observed that the magnehelic pressure gauges which are in parallel with the pump level transducers aggree with the CDS indicated values, i.e., the pumps are in fact, overfilled. Dewar inspection indicated everything normal, Dewar vapor (head) pressures normal, LLCV bypass valves closed, dewar exhausts flowing normally, pump exhausts flowing normally etc. No evidence of "ice ball" buildup around exposed LLCV needle valve valve stem which have prevented full stroke of needle under some conditions in past winters. Problem coincides in time with undocumented events from about 1pm-2pm local time on Tuesday (power cycling? reboots?) -> Set LLCV to manual mode and 50% open valved-out instrument air at LLCV and did not observe valve stroke??? Used heat gun to thaw exposed valve stem and repeated. Now valve stroking between 5% open without instrument air present to 50% of stroke when air valved-in. Repeated thaw excersise with LLCV needle at CP2.-> Conclusion: It looks like LLCV needle valve valve stem was prevented from stroking closed via ice buildup on exposed portion of valve stem. This is consistent with current symptom and past history. The difference in this case is that the ice buildup was not obvious, i.e., no visable "ice ball" this time, but rather, only a thin layer of frost on the valve stem. Weather conditions persist. This problem may reoccur, will monitor.
(Dani, Keita, Matt, Gerardo, Zack, Mike) We removed all components from the optics tables in HAMs 8 and 9. We locked down MC2, MMT2 and the RM before extraction. The AOS PO telescope in HAM9 was pulled with the aid of the surf board/forklift combination, lifting the unit out and transferring it from board to table, once out of chamber. Other components removed include black glass dumps, wire-protection baffles, posts, DLC mount and mirrors, and sundry clamps and hardware. Currently the SOSs are in the OSB optics lab, while the RM and AOS telescope remain in the LVEA. Next week we'll pull optics tables and passive stacks in those HAMs.
CP1 and CP2 level fluctuations appear to be the result of a brief period of loss of control from early in the afternoon. DV trend earlier shows bogus transient values (somebody rebooting???) -> I am monitoring from home now. PID parameters seem unchanged. System should recover. I receive text alarms on my cell phone if levels remain in alarm for more than ~15 minutes.
Terri S., Christina -> Cleaned and prepped HAM8 and HAM9 work area Kyle, Ski, Zak+Rodney (Manpower), Chris (Apollo), Gerardo Jr. -> Removed HAM8 and HAM9 west doors. Kyle -> Opened GV8 and GV6
Shifted over to Chiller 3 and CWP3 following a shutdown of Chiller 1. Investigating cause.
Happy Thanksgiving!
Kyle-Removed all but (4) loosened bolts from HAM8 and HAM9 West doors in preperation for removal tomorrow*Isolated Vertex MTP*Resumed roughing XBM*Switched XBM to MTP*Restored Vertex MTP*Began pumping HAM6 with its turbo*misc. annulus ion pumping X-end pumping flat->no access (tumbleweeds)->will investigate/fix as soon as road reopens. Will likely relieve CP1 and CP2 H2 pressures before long weekend.
