(Alexa, Daniel)
Continuing yesterdays work we locked on PRX and installed the beampspitter in the POP path in front of POPAIR_A. The beam was very weak and we had some fun aligning it. We needed an additional lens (ROC 500mm) to keep the beam small. After the beam combiner we measured 170nW of power. Another short focal length lens was installed after the combiner to focus the beam down. We are still missing a photodetector.
The h1nds0 NDS server has been restarted to allow it to read the recently archived raw_minute files. This is not the default server, so users should not have noticed. Maintenance is ongoing, and will finish tomorrow afternoon.
-TCSx a few hours work left TCSy has problems with control box, on hold. Continuing work on HWS. More projections to do. -HAM4 baffle install ongoing. Cleanroom clearance issues being negotiated. -SR3 going into HAM5. -Ey ESD short center pin to shield, RichardM will cut shield. Fil will double check Ex. -Adding 2 GigE cameras to system, Cyrus will modify switches to allow connection. -ALS diff ongoing, top mass and UIM working. ESD not working, saturation at .5hz.
model restarts logged for Tue 06/May/2014
2014_05_06 03:27 h1fw1
2014_05_06 11:17 h1isiham4
2014_05_06 11:34 h1fw0
2014_05_06 17:02 h1fw0
2014_05_06 21:03 h1fw0
2014_05_06 22:34 h1fw0
2014_05_06 23:48 h1fw0
h1fw1 perhaps still slightly unstable despite solaris reboot. Tue maintenance on HAM ISI. h1fw0 offloading min trends from SSD, looks like this has made fw0 unstable.
The h1fw0 daqd process will continue to be unstable while verification of data that was copied and removal of the data from the SSD continues. This is very disk intensive work, so it will cause occasional restarts of daqd on h1fw0. Work should be complete sometime Wednesday evening.
Took particle counts in and around the HAM5 chamber before installing the SR3 cookie cutter. Before opening the chamber (soft cover) clenaroom counts were 0 for all particle sizes. After opening the soft cover particle counts outside the chamber were <100 for all particle sizes. After opening the soft cover particle counts inside the chamber were 0 for all particle sizes. After installing the cookie cutter for SR3 the in chamber particle counts jumped to just below 500 for 0.3 micron sizes and dropped off as particle size increased. After 5 minutes the highest counts for all particle sizes had dropped back to <35 counts. Note: The RH of the out of chamber cleanroom air was 26%. The first check of the in chamber environment showed a RH of just 7%.
Took PET swipe samples from 05/06/2014 of HAM4, HAM5, & HAM6. These samples were taken after the SR2 alignment was completed and before any suspensions are installed in HAM5. Margo P. did a wipe down on the HAM5 chamber.
-------------------------------------------------------- Kiwamu, Stefan, Sheila We again tried the the ESD feed-back - see title for conclusion: In detail: - We patched the UIM transfer function above 2Hz with a LISO fit. - We verified the sign of all 3 involved states - they are all negative. - We checked the measured transfer functions against the suspension model - they looked all right. - We checked the model (assuming ideal inverted plants) for proper x-ing (plot attached). - Trying to engage the TST drive we ran into TST mass ESD saturations at 0.5Hz. The blend high pass still lets signal through at that frequency. - We started a detailed transfer function measurement for TST (L3) from 2Hz to 0.2Hz, but were interrupted by a small earth quake. Remarks: - Some useful LISO and foton tools are in ~controls/sballmer/bin: - LISO2FotonZPK: convert a LISO fit file into a zpk design string readable by foton. - mkfotoncal: convert a foton zpk design into a list of poles and zeros readable by the DTT calibration feature.
(Alastair H, David H, Greg G, Thomas V, Matt H)
Summary of work:
HWS
TCSy
TCSx
Thanks to everybody who was patient and allowed us to stay laser safe and the gate valves closed until we got both visible beam alignments done for both tables (I know we took a little longer than said we might)
And fingers crossed that the much talked about off table projection for TCSx occurs tomorrow at some stage :-)
We replaced the bulb on the right-hand projector today (the one closest to the MSR).
Kyle soft-closed GV7 and GV5 for TCS alignment work on BSC1 and BSC3 at 9:00 am.
I opened GV7 and GV5 after alignment work was done, last valve open by 3:00 pm.
I copied the filter kHz2um from EX to EY, and modified the xml file to have them engaged permanently. This way we have the L2L SUS transfer functions in um/cts.
(Alexa, Daniel)
We went on ISCT1 to install a new interference path to measure the difference between the PSL sampler beam and the POP beam. This will allow us to measure the path length variations on the input path relative to the green path.
We installed a new 50:50 beamsplitter in the rejected beam of the first dichroic after the SHG. This picks of the red beam coming from the PSL (and some left-over green). Next, we added a new beam path from the POP beam to the other input port of the beampslitter. Currently, there is no detector and all beams are dumped. The 50:50 splitter in the POP path is still missing as well.
We readjusted the green beam path coming from the PSL to eliminate the clipping on the cube polarizer.
8:00 Crystal chiller refilled (180 ml added)- Operator 8:51 GV5 and GV7 soft closing – Kyle 8:56-14:11 Heading to the TCSx area – Matt/David 9:06-9:58 Heading into the LVEA (supervision) – Mike 9:16-11:45 Going to End Y for ESD work – Richard/Filiberto 9:4412:04 Contamination Control work – Jeff B/Margot 9:49-11:47 HEPI Pump #8 maintenance – Hugh/Cori 9:50-12:10 HAM4 Scraper baffle work – Betsy 9:54-11:39 Heading into the LVEA for SR3 alignment setup – Jason 10:10-12:00 Cavity baffle work in LVEA test stand West bay area – Travis/ Mitchell 10:30 Reset of HEPI L4C Accumulated WD Counters – Operator 10:38-12:00 Heading to End Y to set up a camera – Sheila 11:25- Shutting down fw0 to transfer trend data – Jame B. 12:49-14:00 Cleaning work at End Y – Karen 12:49- Cleaning work at End X/Mid X – Chris 13:19- Working in the Optics Lab – Justin 13:26-15:25 Back to Cavity baffle work in LVEA test stand West bay area – Travis/ Mitchell 14:16 LVEA transitioned to LASER HAZARD - Justin
Right now, the best configuration for the ISI-BS is the following:
HIGH_ISOLATED on ST1
DAMPED on ST2
This specific configuration is not possible with the guardian manager (SEI_BS) for now: if you put ISOLATED with the manager, both stages are going to go to HIGH_ISOLATED.
Thus, the temporary solution is to PAUSE the guardian manager and to use the individual guardians (ISI_BS_ST1 & ISI_BS_ST2).
Jamie will be here next week and will fix this situation.
I pulled the IAS PLX periscope off of the table today and stowed it. Then, Margot helped me stage 2 of the 4 baffles destined for HAM4 today, but I discovered the 1) the SR2 suspensions needed additional work and 2) the cookie cutters for the baffles needed hardware. Back at laser hazard now, I am breaking to do other stuff - will continue HAM 4 table top payloading tomorrow morning.
Corey & Hugh Although we don't have to take the Pumps down to grease them, I used the need to grease as excuse to practice taking them down. We changed the ACC & DECelleration times from 1 to 300 seconds to allow the other running pumps to compensate for the one spinning down. This combined with closing the outlet valve to prevent the pump from reversing was not sufficient however to eliminate glitches in the pressure and the Actuators. Attached are trends from the Pump System and BSC2. You can see the motor drive changes, CH2, during the transitions from 4 to 3 pumps and back; as well as, the pressure changes usually at the beginning or end of the transition but not just there. Also, looking at the other channels on the graph, you can see glitches in the local IPS and Cartesian channels of the BS HEPI, Cartesian CPS channels and BS ISI Witness channels. In the second attachment I've zoomed into the second transition from 3 back to 4 pumps. This is when we had the largest glitch in the pressure and you can see it strongly make it into the M1 Witness channels. The glitches didn't show as strongly in the velocity sensors as much so I don't include any of those although I wouldn't say they were unaffected. The first plot is 2 hours long and we were on 3 pumps for about 45 minutes as Corey and I figured out how to make a grease gun work. During the 3 pump running time, it seems many of the HEPI & CPS signals are noisier. Happy to accept guidance on evaluating if this is a configuration we want to avoid, that is, 3 pumps versus 4.
The "in chamber" SR2 open light values are :
M1T1 25373 1.182 -12686
M1T2 26012 1.153 -13006
M1T3 24840 1.208 -12420
M1LF 30482 0.984 -15241
M1RT 24731 1.213 -12366
M1SD 25027 1.199 -12513
M2UL 24112 1.244 -12056
M2LL 26045 1.152 -13022
M2UR 23920 1.254 -11960
M2LR 25085 1.196 -12543
M3UL 24821 1.209 -12410
M3LL 24674 1.216 -12337
M3UR 23869 1.257 -11934
M3LR 23932 1.254 -11966
A new safe.snap was made and the spreadsheet E1200343 was updated
Note - I asked Arnaud to recheck these since we already had the lower stage OSEMs pulled back for the IAS alignment. As well, I discovered that the top mass blade tip EQ stops are the rattle-loose kind so I need to now swap them in-chamber. So, I pulled the top 6 BOSEMs off as well - a good time to recheck the OLV settings of all OSEMs.
We have set up the ISCT1 ALS-Y-GREEN digital video camera (number 05 on the camera overview screen). We have left the CCD on the table in case we need it for any reason. We are still using the CCD camera for the x-arm, but the digital video camera is ready and in place when we want to swap that out.
I also brought BBPD (S1200247) from MY to ISCT1. The PD is mounted. Power and cables are still needed, but Kiwamu indicated we can borrow the 3f PD power from the legacy PD interface.
I have removed the CCD camera used for the y-arm beam and returned it to the shelves by the field racks.
I placed an ND06A (25±4% transmission for 1064nm) before the 50/50BS to reduce the power coming in from the PSL reference path. We also have a ND10A (10±4% transmission for 1064nm) readily avaliable (and it's an easy swap) if need be. The BBPD max incident power is 50mW for 1064nm. I have not measured the incident power yet.
Thanks to Stefan and Kiwamu, we got PRMI locked. This is much easier to work with :). I was able to do a rough aligmnet of the two beams by adjusting the BS. It remains to install the BBPD, but we have everything ready, so this should not take long and we should be able to finally do our measurement tomorrow.