[Jim, Sebastien]

This week, we've seen the gain of L4C-H2 changing randomly, from nominal gain to a factor of 2 lower.

We tried to chase down this issue without success (see aLOG #8632 and 8666). Everytime we tried something, it magically resolved by itself, and there were no way to reproduced it.

After it happened again today, we might have found the issue though: the in-air cable at the feedthrough felt a little "squishy" and loose. Jim unplugged it and readjusted everything. It feels much better now, and the issue is once again gone.

According to what we saw before, we're pretty confident that was it. If it wasn't, let's keep in mind to start looking at the feedthrough when it happens again.

All the HEPI models have been updated, compiled and installed at LHO on all teh HEPIs. The update went great, no issue so far.

The next action monday will be, on HEPI-HAM2 and HEPI-HAM3, to translate the alignment offsets calculated before when the IMC was locked (see aLOG # 7189 and 7180) from local basis to cartesian basis.

Not a hard task, but I've been having trouble with it. I'll continue Monday.

Tfs were run last night but we have a few empty buckets. Filling those overnight. OPSWS0.

Deed was done ~10 am local.

Day Shift Summary
LVEA Laser Safe

Patrick – Changing dust monitoring sample and hold times on several dust monitors
Gerardo – At End-Y
Filiberto – At End-Y working on the Beckhoff system
Jonathan – Recovering equipment from LVEA
Cory – At End-X gathering TMS parts for shipment to LLO
Sebastian – Restarting HEPI models
Hugh – At End-Y working on HEPI 
Dave/Jim – Restart the DAC
Dale – At End-Y checking on P-Cal Install
Scrap Metal Recyclers on site to change out collection containers
Cyrus – At Mid-X to swap media converters

I swapped out the DAQ Netgear switch at MX for the appropriate media converter, to reclaim this switch for other purposes.  This matches the earlier change for the FE switch for MX/h1pemmx.  h1pemmx was restarted successfully.

The H1SUSIM model died at 9:15 AM PST with an error of ADC timeout.  The h1susim and h1iopsush2b models were restarted about 10:22 PST to clear the error.

After Sebastien updated the HEPI models I did a DAQ restart to resync the INI files at 11:08

The following cables for the demod concentrator readbacks (HAM6) did not have pin 19 connected as reported by Daniel Sigg https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=8640 :

H1:ISC_203
H1:ISC_204
H1:ISC_205
H1:ISC_207
H1:ISC_210

Pin 19 was attached on both ends and reconnected back to electronics.

Changed shell environment scripts to properly set up EPICS_CA_ADDR_LIST depending on the network the workstation is connected to.  Should be transparent to the user.

The mobility experiment camera and illuminator cans have been installed on HAM 3's west door.  The associated power supply, computer, etc. are on a cart just outside of the cleanroom.  Please be careful when working around these items.  Also, please let me know if these need to be moved at any time or if cabling needs to be rerouted (is some minor draping over HEPI ok?).  The system will only be active during periods of pumpdown or vent, so can be removed during other periods if required.

I've made some wireless AP and associated switchport changes to support the new workstation VLAN (none of which are particularly user facing).

After flushing the cut & reconnected fluid lines since 6 August at near full motor speed, this morning I reintroduced fluid to the Actuators in Bleed mode.  The pressure set point was stepped up to 80psi.  While these Actuators saw operation at BSC6 during the single arm period, they still may need bleeding after having the four way valves disconnected.  I inspected the new connections and detected no leaks; will check again later today.  We'll put these actuators into run mode early next week and we'll be in ready state.  Still need wiring to the piers...

With the IR beam bath on the trans-mon ISC table (in vac) aligned, I had to move the IR telescope of the in-air ISCTEX by 3in in -x direction, and lower the top periscope mirror by maybe 4in. I moved the two-in lens on the periscope down to accommodate the top periscope mirror. Mirrors and lens were roughly aligned, but need a fine-tweak once we have a steady reference beam.

Ion pump only for 24 hours = 3 LEDs -> Decoupled aux. pump cart

I changed the sample and hold times for the dust monitors to the following:

LVEA 3
Sample Time: 20 sec
Hold Time: 40 sec

LVEA 5
Sample Time: 20 sec
Hold Time: 280 sec

LVEA 9
Sample Time: 20 sec
Hold Time: 40 sec

LVEA 10
Sample Time: 20 sec
Hold Time: 40 sec

LVEA 15
Sample Time: 20 sec
Hold Time: 40 sec

LVEA 16
Sample Time: 20 sec
Hold Time: 40 sec

EX 1
Sample Time: 20 sec
Hold Time: 40 sec

EY 1
Sample Time: 20 sec
Hold Time: 40 sec

DR 1
Sample Time: 20 sec
Hold Time: 280 sec

LAB 1
Sample Time: 20 sec
Hold Time: 280 sec

LAB 2
Sample Time: 20 sec
Hold Time: 280 sec

LAB 3
Sample Time: 20 sec
Hold Time: 280 sec

Temp dogs were removed.

Isctex green periscope readjusted as it was close to the edge.

Tele beam position readjusted so the beam is centered on the primary.

Red extraction path was done.

High power beam dump path was done.

Working on IR QPD sled path.

After fixing any loose dog clamps, and retorquing, Arnaud and I took B&K hammer measurements of the HAM2 PR3, PRM, and MC1 this morning.  We still need to do PR2 and MC3 (which has a temp IO alignment mirror nestled up against it's structure).  We took PR3 and PRM data with vibration absorbers on and off.  We only took MC1 data with the vibration absorbers on since they were already on and are difficult to remove and then replace.  Plots and statements to come.