Jennie W

As per work permit #13412 the SPI laser has been unshuttered using the shutter controller on the floor behind the R4 electronics racks.

This is to monitor SPI alignment as the pumpdown continues and uses powers below 100 mW.

See photo showing the demodulated signals for the Rreference and Measurement SPI interferometers after the laser was unshuttered at 18:08:11 UTC.

Matt, Camilla

We updated H1:AWC-ITMX_PD_{A,B}_TRANSIMPEDANCE and H1:AWC-ITMX_PD_{A,B}_RESPONSIVITY as per D2500105, as attached. 

Per WP13409, I've transitioned the LVEA to Operations Phase Laser SAFE according to M1100115, meaning all viewports, tables, and bellows have been checked that they're closed and beams are allowed back into the vacuum envelope. However, as the corner volume is pumping down and HAM1 is still at-air, I did not unlock/open light pipes or turn back on auxiliary lasers (CO2, HWS, etc.).

Over the weekend, there was another HEPI corner station dip/spike which prompted the verbal alarm notification. This last happend on Friday (alog 90984)

This time, the PS2_PRESS1 (red in attached plot) dipped by 10PSI before recovering. The bottom row of the plot are the controllers. Tagging SEI.

TITLE: 07/13 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
OUTGOING OPERATOR: None
CURRENT ENVIRONMENT:
    SEI_ENV state: MAINTENANCE
    Wind: 5mph Gusts, 1mph 3min avg
    Primary useism: 0.01 μm/s
    Secondary useism: 0.06 μm/s 
QUICK SUMMARY:

IFO is in IDLE for MAINTENANCE

Plan today is to continue pumpdown. Other tasks:

• BBSS QOSEM whitening chassis work
• BBSS P to Y decoupling matrix work
• EE recabing around ICST1/IOT2L/TCSX/TSCY

Restarted Corner pumpdown this morning ~8:08 am

Starting Pressure at PT180: 390 Torr

Stopping Pressure at PT180: 32.7 Torr

Today's pumping time: 9 hours and 25 minutes

Mobile ISP1000 pumps are isolated and powered off for the weekend. Turbopump station and backing scroll pump are powered on and isolated from the main volume.

Wed afternoon Nergis and I went to SQZT7 to get a couple of beam profiles after the ZM4 preload was adjusted, before the ZM5 swap. 

We took two measurements with the same psams settings but different centering on ZM2, based on what Camilla and Madi did in 90946 .  The data labeled as  nominal position is for these sliders where Camila reports that the beam on ZM2 is 5.85" off the table, and the data labeled raised is for these sliders where the beam is actaully lowered to 5.75".  The center of ZM2 should be 5.5" off the table.  M^2 went from 1.35 to 1.28 horizontal and 1.25 vertical with the improved centering, and the relative astigmatism also improved from 0.13 to 0.02 Ryan found the definition of relative astigmatism on page 122 (pdf page 129) of the BC207 manual here.

ZM4 strain guage was saturated when the PZT was much above 100V, so this morning Daniel came to SQZ racks with Ryan and I and changed some resistors, Daniel will add the details.  ZM4 strain guage is now working well, with values between -4.1V to 2.7V, and Ryan turned the servo back on. 

Yesterday morning, I noticed that for some psams settings, the beam was clipping on the top periscope mirror and that then we measured quite high M^2 values.  I wondered if clipping on that persicope could explain more of our M^2 measurements.  Today Ryan Short and I carefully aligned the psams to get the beam centered on the two irises on SQZT7.  We raised the top periscope mirrors, and Ryan adjusted both periscope mirrors to get the beam well centered on the irises again.  When we did this, we noticed that only one of the bolts that holds the top periscope mount to the periscope structure was tight.  

After this Ryan and I did another round of profile measurements with the new preload and working strain guage on ZM4.  We took 5 points over the range of ZM4 with ZM5 PZT at 100V, with the ZM5 strain guage not working, then took 3 points with ZM5 at a strain guage of -4.5V which is 20V on the PZT, because the ZM5 strain guage is working there we can compare these to measurements taken before ZM5 stopped working.  

Unfortunately, even after moving the periscope mirror the M^2 values are in the range of 1.4 to 1.23, so the clipping on the periscope mirror wasn't the explanation for the high M^2

Jennie W

While trying to debug some other SPI readout problems I noticed that the main SPI overview screen had one of the readback channel names wrong.

The 'DISP OUT' block in red at the right of the screen should readout the channel 'H1:SPI-H23_DIFFDISP_DIAG_INMON' and 'H1:SPI-H23_DIFFDISP_DIAG_OUT16' in its bottom row.

These were reading out the channel above 'REFNULL' in boith cases. I corrected this in SPI_CUST_OVERVIEW.adl file and committed to the svn. In the picture the readouts are circled on the right with the channels they readout shown on the left in the filter banks.

TITLE: 07/10 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
INCOMING OPERATOR: None
SHIFT SUMMARY:

IFO is in IDLE for MAINTENANCE

Pumpdown continues - see attached screenshot

Ryan S, Sheila and Daniel also did some work at SQZT7

In other news,

• HEPI pumps blip - alog 90984
• GC Maintenance - WP 13395

LOG:

Ibrahim

Got a message at 14:58 UTC to "Check HEPI pump station pressures".

At 14:58,

• the pressure in HEPI Corner Station PS4_PRESS1 (brown) dipped by -5PSI and then spiked by +0.3PSI before recovering. Stable now.
• the pressure in all other HEPI Corner Stations dropped by -0.3PSI from nominal and then spiked to +0.1PSI before recovering. It's stable now. Plots are below.

I checked the End Stations too but nothing was seen (also attached).

TITLE: 07/10 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
OUTGOING OPERATOR: None
CURRENT ENVIRONMENT:
    SEI_ENV state: MAINTENANCE
    Wind: 7mph Gusts, 3mph 3min avg
    Primary useism: 0.01 μm/s
    Secondary useism: 0.08 μm/s 
QUICK SUMMARY:

IFO is in IDLE for MAINTENANCE

No specific tasks today since it's RDO Friday for most

Corner pumpdown yesterday afternoon (alog 90979)

(Jordan, Travis, Richard, Filiberto, Randy, Gerardo)

Corner pumpdown started Thursday afternoon, around 4:40 pm local time.
We setup the twin mobile ISP-1000 scroll pump stations at the YBM turbo station, we chose this area due to the real estate available, the other 2 stations are a bit crowded.  After setting up all of the required equipment the pumpdown was started with procedure E2300169, to setup the turbo pump unit for the pumpdown, then Jordan and Filiberto covered procedure M1300464 to make sure all high voltage DC power supplies were off, then continued following E2300443 to start the pumpdown with the ISP-1000 scroll pumps through the YBM turbo pump.  Pumpdown was done for about 2 hours taking us down to 340 Torr.  The pumpdown was stopped at 7:02 pm local time for the night.

No issues to report during the startup of the pumpdown, however something to note is that during the blow down of the vacuum envelope the system was not pressurized, last minute work on the different chambers did not allowed to pressurize the envelope. 

As per WP 13401.  In preparation for upcoming daqd upgrades I'm working to move the run number server off of h1daqscript0 and onto the HA container cluster.  I have the new instance running with the current run number database.  I just need to configure the framewriters to point to it.  I will do that next week.   The run number server helps keep the run number that is put into the frames consistent between the two frame writers.

This is a step to retiring the h1daqscript0 machine once we remove the daqd's px dolphin.

Per FRS 38164, the unused viewport located at A1F1 and A2F1 on HAM7 have been removed and blanked off.  These viewports are being moved to HAM3, so serial number, etc. will be recorded in a separate aLog.

Late entry for VAC - Gerardo, Travis, Jordan, Tyler and Randy put the doors on HAM3 yesterday afternoon.  They did -Y first, then +Y.  Getting the doors craned over and transferred to the Forklift could only happen at the corner near the TCSy table, so was a tight fit at that transfer point.

These were the last doors to go on for this vent window.

Well done team.

Ken, Preeti, TJ

We've made transfer functions to see and compare the level of cross coupling between P and Y at both sites for the top stage of BBSS. The L1 traces were rescaled to match the H1 magnitude for the PtoP comparison at 0.1Hz. The scaling factor was 3.72. This was done to compensate for the DAC differences between the sites. All of the L1 traces were multiplied by this scale factor. All plots are found in the attached PDF. 

(Jordan, Owen, Jake, Gerardo)

The cryotrap cooldown continues, we continue to pump on the cryotrap volume with a turbo pump, the turbo is backed with a SS500 aux cart.

Small changes were the removal of the calibrated leak from the RGA tree, along with the removal of other components in preparation to install an incoming small ion pump next week.

Current pressure in the cryotrap volume is 7.38X10^-10 Torr.

I did a very quick search and didn't find any other posts, so I putting a plot here comparing the motion of the pre-vent HAM1 TT L4C passive stack motion to the current HAM1 ISI motion. ISI motion is generally 1-3 orders of magnitude better, only with a very narrow window at 15hz where the passive stack barely reached down to the ISI motion, but only for the x dof. Blue, green and brown are the ISI, cyan, pink and black are the passive stack.

Almost done with the st0 feedforward, X,Y,Z and RY are running. Still have to do tilt decoupling (which will improve low frequency motion), vac work at the chamber kept tripping the ISI during my measurements this morning.