Laser Status:
SysStat is good
Front End Power is -0.005834W (should be around 30 W)----->This has been 0W since March 19, 2018, due to PSL work...should this check be removed/updated?
HPO Output Power is 0.926W
Front End Watch is GREEN
HPO Watch is RED

PMC:
It has been locked 6 days, 18 hr 55 minutes (should be days/weeks)
Reflected power = 18.51Watts
Transmitted power = 42.82Watts
PowerSum = 61.33Watts.

FSS:
It has been locked for 0 days 15 hr and 37 min (should be days/weeks)
TPD[V] = 2.8V (min 0.9V)

ISS:
The diffracted power is around 0.87% (should be 3-5%)
Last saturation event was 0 days 16 hours and 53 minutes ago (should be days/weeks)

Possible Issues:
Front End Power is Low (see highlighted note above)
PMC reflected power is high
ISS diffracted power is Low
LRA out of range, see SYSSTAT.adl

STS Centering Check run.  All proof masses within range, EXCEPT for following:

• STS A DOF X/U = -8.163 [V]

T240 Centering Check run.  All proof masses within range, EXCEPT for following:

• ETMX T240 1 DOF Z/W = -0.892 [V]
• ETMX T240 2 DOF X/U = -0.995 [V]
• ETMX T240 2 DOF Y/V = -0.692 [V]
• ETMX T240 2 DOF Z/W = -0.97 [V]
• ETMX T240 3 DOF X/U = -0.611 [V]
• ITMX T240 1 DOF X/U = -0.93 [V]
• ITMX T240 3 DOF X/U = -1.015 [V]
• ITMY T240 3 DOF X/U = -0.877 [V]
• ITMY T240 3 DOF Z/W = -1.597 [V]

Transitioned the LVEA to Laser Safe.

Note: Both shutters (from PSL into HAM1) are open and not locked out.

         The ISCHT6R laser power supply light indicated the power supply was off. However, the key was still in the on position. Moved key to off position and removed. The power supply key is next to the door key.

        Rearranged the laser barriers around the enclosure at HAM5 to better seal off the entrance to the enclosure.  

TITLE: 06/05 Day Shift: 15:00-23:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Planned Engineering
OUTGOING OPERATOR: None
CURRENT ENVIRONMENT:
    Wind: 10mph Gusts, 7mph 5min avg
    Primary useism: 0.11 μm/s
    Secondary useism: 0.21 μm/s
QUICK SUMMARY:

LVEA transitioned to SAFE this morning.  A few contractors on site already for Maintenance Day.

[Sheila, Gabriele]

Work Permit 7619

Today we wanted to check the beam spot position on the IMC mirrors, with the additional goal of having a continuous monitoring (and possibly control) of the IMC "uncontrolled" DOF4 (which is related to the output pointing).

We soon realized that the current implementation of the dithering had some limitations: 1) only one local oscillator 2) sine added to the angular control signal and sent to the top stage instead of the bottom stage

Therefore, we modified the h1ascimc, h1susmc1, h1susmc2 and h1susmc3 model:

• added 8 oscillators, one for each IMC ASC degree of freedom (pitch and yaw)
• the oscillator signals are sent to the suspensions with new IPCs, and added to the bottom stage
• the demodulated signals can be used for feedback if desired

Medm screens have been edited. Models have been compiled, installed and restarted. Model and medm screens committed.

Valved in aux carts and continued to pump IP2,3 today. This evening I turned HV ON and both are maintaining so far. Because IP3 is a newly rebuilt pump, I valved out the aux cart for the evening. If it checks out tomorrow morning, we can decouple that cart and use it on the NEGs. IP2 is currently at 7kV and 715 uA. I left pump cart valved into IP2 for the night.

The  ion pump that pumps GV12's annulus volume seems to have shorted out a few hours after valving-out the turbo setup last Friday.  So today, I valved the turbo back in and let it "assist" the ion pump but the ion current never came on scale.  The pressure gauge at the aux. cart  indicates that the annulus volume is at a low enough pressure that the ion pump should easily be able to handle the gas load.  I swapped the controllers and tapped the pump body - no help.  I next connected a high power / high voltage DC power supply to the pump in place of the nominal low power controller but couldn't increase the voltage above 40 volts which indicates a "robust" short. 

For tonight, I am leaving the ion pump off and the turbo valved-out.  It looks like we may have to vent the annulus volume and replace the ion pump tomorrow.  This is "undesirable" as the gate annulus volume (now believed to be exposed to the beam tube vacuum) will be separated from the adjacent vented annulus volume by only (1) metal-sealed valve during the replacement process.  We prefer to always have two layers of protection between atmosphere and the BT. 

Gerardo M., Kyle R.

Began rough pumping of X-end using the QDP80.  Also, began pumping BSC9's annulus volume via locally connected small turbo backed by an aux. pump cart.  -> The 10" gate valve at the inlet of the Main Turbo Pump will be closed before leaving tonight.  Pumping to resume tomorrow (a.k.a. attended pumping).

Note:  for tomorrow morning, we will be transitioning the LVEA to SAFE (wp #7620)

• 19:00 Arrival for remainder of shift
• Ongoing activities:
  • 18:13-19:56 Rerouting cables for ITMy charge measurement (Georgia)
  • 18:28-20:05 Turn on ALS laser (WP#7618, Keita)
  • 18:51-19:18 Running Fiber in LVEA (Richard, Fil)
• 19:45 APS vehicle on-site
• 20:38-23:09 ISC Rack check (Dick & Nolan [new SURF])
• 20:48 Low-Voltage ESD at EX (Fil)
• 21:25 ASC Model work (Sheila, Dave)
• 22:02 Turning off ETMy Oplev for 1-hr (Suresh)
• 22:07 Cleaning Room visit (Jeff B)

Following on from alog 42302, I have done an effective bias voltage measurement of ITMY.

The effective bias voltage appears significantly lower for ITMY compared to ITMX:

Note that the coupling from the signal drive to the optical lever, particularly in pitch, is reduced compared to the ITMX measurement. This is shown in the first attached figure, which shows the signal drive to optical lever transfer function as a function of bias voltage offset. This can be compared with the figure attached to alog 42302.

For these measurements, the ITMY optical lever was quieter than the ITMX. The final two attached screenshots show the ITMX and ITMY optical lever spectra respectively. Red traces (references 0 and 1) are without a signal drive, and blue traces are while driving the LL quadrant at 0.8 Hz, with a large negative bias voltage. The signal-to-noise ratio is much better on ITMY.

Greg, Dave:

following the failure of the E18-0 Pod-1 Disk-6 last week, Nexsan sent a replacement 6TB HDD today. Greg and I hot swapped the disks at 13:00 and added the new disk to the raid at 14:50. It is in the process of being rebuilt, which for a 6TB drive in background mode could take some time.

This was a truly hot swap, with the h1fw0 frame writer running throughout with no problems.

With the most current DRMI alignment, we found it hard to close the OMC ASC loops and had to put a few offsets in the AS WFS DC Centering loops in order to keep the OMC suspension from railing. 

Since the AS WFS weren't holding any particular reference, I took the time to offload the beam into the OMC using OM1 and OM2, of course this mis-centers the AS WFS so then I pico-ed the beam back onto AS_A and AS_B.  This leaves about 80% margin on the OMC_SUS DACs.  I then offloaded the control signals for the DC_Centering loops and the OMC_ASC to their respective alignment sliders.  

Also, I realized the the OMC guardian state "ASC_QPD_ON" doesn't reflect the OM actuation sign flip so I changed that as well and committed to SVN.

WP7619

Sheila, Jenne, Dave:

New code was installed for the models h1ascimc, h1susmc[1,2,3]. New code and new IPC senders were added to h1ascimc, associated IPC receivers were added to h1susmc[1,2,3]. The DAQ was restarted.

This is a late alog about what was done on Friday last week.

At first the IR beam was clipping on the right  side of the first 1" mirror downstream of the periscope (ALS-M3 on D1201103). I moved it by about 6mm toward the PSL.

I aligned the IR beam going into the SHG by using ALS-M3 and ALS-M5 so the green beam falls on  ALS-COMM diode.

The beam was centered on IR monitor diode using ALS-M4.

The centering on the green monitor diode was OK, there was no big change (if any at all) when I changed the angle of ALS-BS2.

Laser power upstream of ALS-BS1 was about 200mW, and the green power downstream of the IRHR dichroic was about 220uW. Before laser swap, IR power was about 1.2W according to IR_DC_POWERMON, and the green power was about 8.3mW. It seems like the numbers make sense, i.e. 8.3mW * (200mW/1.2W)^2 = 8.3mw/36 = 230uW ~ 220uW.

I don't know if we're throttling power using HWP and polarizing splitter right after the PMC.

I went to EX, turned on the ALSX laser and locked PLL.

EX is still in laser safe.

I had to manually set the slow feedback offset to about negative 800MHz until the beat note appeared on the correct side (lower than PSL). This was relieved by increasing the temperature setpoint by 0.26 C (23.67 to 23.93).

   Both filter are clean and clear. No debris or discoloration noted in either filter. 

   Additionally - Added 50ml water to the crystal chiller. Did not add any water to the diode chiller. 

   Closing FAMIS task #8309.   

On Bubba's request I have bypassed the RO cell phone alarms for 24 hours

Bypass will expire:
Tue Jun  5 12:39:02 PDT 2018
For channel(s):
    H0:FMC-CS_WS_RO_ALARM

While inspecting the HR surface during (and just) after the FirstContact pull on the ETMX HR Surface yesterday, Travis and I saw a few points within the central 6" of the optic.  Pictures are attached.  One feature looks more like a small sleek or scratch rather than a dot.  Upon review of the "map" we made roughly a year ago when the optic was in the bonding lab (also attached), we see that many of these were there during that inspection.  In conference with GariLynn this morning, she confirmed my decision to move to chamber closeout and the door has just been installed on the chamber.  We will digest these pictures and compare to previously obtained coating maps and metrology data.

Note, keep in mind that it is very difficult to say much about the optic surface quality based on these photos.  It is difficult to state whether such observed features will be a problem, whether they are in the coating or on top of the coating, etc.  TBC...

Craig, Jenne, Shelia

I altered /opt/rtcds/userapps/release/ioo/common/guardian/IMC_LOCK.py such that the OFFLOAD_MCWFS guardian state should now hopefully do it's job.  This is slightly more difficult for the IMC WFS because we have to deal with offsetting the steering PZT correctly.

We do the same offloading as normal for MC1, MC2, and MC3.  For the PZT we hold the filter module output, change the offset, clear the history (including the input), then unhold the output.  If this breaks the IMC locking scheme, you can comment out the new guardian state and uncomment the old one directly below it.