(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.

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

• No additional work since last friday

TCSy

• The majority of the on table components have been staged on the table ready for alignment
• The persicope mirrors were placed in the mounts and a red HeNe beam has been used to align a path for the laser to go up the periscope and be centered onto the CP
• Having some troubles getting the laser to turn on. The 4 control boxes have to try on site (not counting the X-table one) do not enable. Even trying it on the TCSx table the control boxes do not enable. The TCSx box does enable when trialed on teh TCSy electronics, so it appears something is amiss with these boxes that will need to look into

TCSx

• The optics and photodiodes for the ISS path have been aligned. Note: The photodidoes are not in their final position as I was cautious and didnt put the photodiodes as close to the focus as will need them to go as didnt want to fry them without trialing them. So need to push photodiodes back closer to focus to get all the beam into the photodiodes
• Like TCSy, a red HeNe beam has been used to to align a path for the laser to go up the periscope and be centered onto the CP. We checked that we could scan the beam up and down and side to side across the optic within the range of the actuators on the top mirror on the periscope. Irises were placed in the beam path defined by the red beam to align the CO2 beam to
• The breaker box for the ISS box sent recently from CIT for installation has been placed in series between the feedthrough and the ISS box as requested.
• We have roughly aligned the central heating beam path onto the irises and are now working on the annular heating path being aligned to these irises also.
• We stil have one more lens to put in as well and then fine tune alignment to he irises before ready for a projection
• Laser shields have slowly started to be placed in where we can at the moment.
• Also need to recheck alignment to the power meter and the FLIR camera as we have to adjust a beamsplitter to allow the CO2 beam to go into the irises, thue potentially having adjusted this beam path.
• Ive also noticed that in MEDM that some channels are mislabeled so when get a chance will need to change these also

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