The HAM6 RGA tree had a known leak coming from the needle valve on the calibrated leak, so the calibrated leaks were removed from the system and the tree now only consists of the RGA, 10 l/s Ion Pump and a pump out port.

The tree was re-wrapped with heat tape and is currently baking at high temp using an aux cart and 80 l/s turbopump. Caution tape has been installed around the -Y door of HAM6, please avoid the area.

WP13221 Add BBSS Fast Channels to DAQ

Tom, Oli, Erik, Dave:

18 BBSS_OSEMINF (SUM, X, Y) DQ channels were added to the DAQ, all at 256Hz. DAQ retstart was required.

WP13223 Add PT100A VACSTAT slow channels to DAQ

Dave:

A new H1EPICS_VACSTAT.ini was generated adding PT100A. An EDC+DAQ restart was required.

WP13228 Add FW2 slow channels to DAQ

Erik, Jonathan, Dave:

Puppet was changed to add three channels unique to FW2 (STATE_0, STATE_1, NUM_WRITERS). An EDC+DAQ restart was required.

WP13235 h1sush6 IO Chassis Install

Fil, Dave:

Fil moved the IO Chassis for h1sush6 from its temporary location in an adjacent rack into the SUSH6 rack on the MER. h1sush6 front end was powered down for the duration of this work.

DAQ Restart

Erik, Jonathan, Dave:

The DAQ and EDC were restarted.

FW2 stopped at the time puppet was upgraded due to a file creation race condition.

For the DAQ restart itself, the main issue was two spontaneous restarts of FW1, both after running for 10 minutes but not synced to the writing of the second trend frame files.

WP 13235
WP 13169
Drawing O5 SUS HAM6 (sush6) System Wiring Diagrams - D2300379

The O5 SUS HAM6 electronics and in-rack cabling installation in the MER is complete. System wiring diagrams D2300379 will need to be updated to show no IO h1susauxh6 was installed. New ADC cards (SUS AUX) were installed in the h1seih7 IO chassis.

IO chassis h1sush6 and h1sush7 share a 24V power supply. A dual Kepco power supply was installed to power the ±18V for SUS-M2. New electronics except the h1sush6 IO chassis were left powered off.

Status of the SUS-R7 rack is ongoing. All electronics installed. All long cables from MER and CER pulled and dressed. Rack requires ±18V and 200V for PSAMS. Depending on loads, plan is to use the SUS-R4 power supplies for the ±18V. The HV power supply will need to be placed on the HAM6 vacuum gauge interlock.

Fil, Erik, Dave:

we have powered down h1sush6 front end in preparation for Fil's move of the IO Chassis into the SUSH6 rack on the MER. Reminder that this front end is not connected to the Dolphin switch, so there is no risk of a corner station Dolphin glitch.

Pictures and the timelapse video from the BSC2 Cartridge (alog 90021) last week are attached and/or at https://caltech.box.com/s/4ahvfvdnaev8iiz3ktgda8g00srpvv1x

TITLE: 05/05 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: 14mph Gusts, 10mph 3min avg
    Primary useism: 0.02 μm/s
    Secondary useism: 0.11 μm/s 
QUICK SUMMARY: Surveying on the BS at the test stand in the LVEA continues today, along with RGA work at HAM6 and CP1 regen near the Y-manifold. HAM2 doors are also likely to come off today.

TITLE: 05/05 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
INCOMING OPERATOR: None
SHIFT SUMMARY: Work continued with the BS on the test stand, preparations were made for HAM2 doors to come off later this week, and baffle installation in HAM3 all took place today.

I neglected to post this yesterday afternoon and unfortunately did not save the log.

Workstations were updated and rebooted.  This was an OS packages update.  Conda packages were not updated.

Gerardo, Jordan, Jonathan, Dave:

PT114 has started to rise rapidly. At 16:50 I changed its alarm high from 2.0e-08 to 5.0e-04.

Later PT114B's VACSTAT continued to trip due to the large delta-P. After clearing the alarms I have disabled PT114B in VACSTAT (but its level alarms remain active).

h1daqdc0 stopped running around the time I restarted vacstat_ioc on cdsioc0 to clear an alarm. DC0 is pingable, but we cannot ssh onto it. Jonathan is taking a look, we may have to power cycle it via IPMI.

Turn ALS X laser back back on, we used it to take some ALS return beam beam profiles. It's been off since the interlock was worked on. It is now shuttered. 

Ibrahim, Betsy

Today we:

1. Replaced the in-vac cables with the new QOSEM ones, maintaining their positions in the cable clamps
2. Wrestled the gold BS baffles loose to make way for clearer alignment sighting
3. Unpacked and set-up the magnet gluing set-up in prep for BBS01 arrival tomorrow.

On Friday I setup the QOSEM calibration rig in the triple lab, in the staging building. It consists of a motorored translation stage (open loop picomotor), which drives the QOSEM flag into and out of the QOSEM body, while the sum and difference voltages produced by the sat amp are monitored. The position of the stage, and hence flag is readout by a Mach-Zender interferometer (SmarAct PicoScale). This is all controlled by a laptop running a python script.

The purpose of setting up this rig again is to better calibrate each QOSEM going on to the BBSS M1, by taking calibration data with the exact sat amp and flag that each QOSEM will use.

[Tom Roocke, Oli]

Summary: The 6 QOSEMs and their signal chain for the BBSS are operational with the final sat amp, CER wiring, CDS mapping, in vac DB25 extension cables. All that remains to test before SUS installation is the duopus cables, which are in C&B currently.

In continuation from yesterday, we are testing out the QOSEM signal chain prior to installation of the BBSS. Yesterday we verified the sat amp was still functional and the readouts were showing up in CDS appropriately. See LHO:90072. Today we checked both the DB25 to DB25 extension cables, and the QOSEMs. To come is testing of the duopus cables, which are still in C&B.

DB25 Extension Testing:
Using a known functional Duopus cable (S2600215), and inair DB25, we tested the three DB25 extension cables by reading for the QOSEM coil resistance and diode drops at the in air DB25, where it connects to the sat amp. See the signal continuity test section in T2600170 for more information on this. All 3 cables are functional.

S2001548: DB25 working
S2100358: DB25 working
S2100410: DB25 working

QOSEM CDS Readout Testing:

Using a known functional Duopus Cable (S2600215), DB25 Extension (S2100410) and in air DB25, we checked for the open sum voltage in the CDS readout. This is the voltage seen on the sum channel of the QPD with no lens installed. Seeing a nonzero voltage here indicates that the QOSEM LED, QPD and signal chain are functional, but will be far lower than the operational sum level when the lens flag is appropriately focusing light onto the QPD. We tested the open sum voltage for all 6 QOSEMs designated for the BBSS. All QOSEMs and there signal chain are functional.

S2600008: working with open sum of 13910
S2600009: working with open sum of 14755
S2600010: working with open sum of 15550
S2600011: working with open sum of 15470
S2600012: working with open sum of 15348
S2600013: working with Open Sum of 14380

The BSC2 cartridge was removed from the BSC2 chamber today and placed on the Test Stand in the West Bay (+Y bay).  The lift took 3 "test lifts" to make very minor adjustments to the CG prior to lift out of the chamber - on the 4th lift, we were very well balanced so embarked on the flight.
Like LLO, the BS had it's "Stay Leg" assemblies and Vibration Absorber Assemblies removed for the flight.  This means it was probably lighter than the 2013 time (alog 5689) when we did this which had the weight slightly heavier.  The cartridge plus 3-point lift fixture and load cell together all weighed 9380 lbs.  It was rotated 90deg Counterclockwise per the procedures and landed on the threaded rod in the test stand with little issue other than careful craning and spotting.
All went as expected and according to the procedures E1200433-v3, E1200971-v4 and associated docs.

Mitchell, Travis, Tyler, Randy (on crane) all up on the platform
Jim and Tony inside of BSC2
Gerardo, Jordan on the eMod as Support
TJ on the camera
Betsy soaking it all in (support)

A pre-lift meeting was held to go over the teams and maneuver details (again) at 9am prior to work starting.

Particle counts up at the dome level were all 0,0 before starting.
More photos and videos will be posted when those folks have them available.

Covers used - A BS/QUAD SUS tube cover up underneath, an ISI cover up on the ISI, the BSC Cartridge sock which encased the whole thing, dropped down to Jim and Tony once the lift was up a couple feet.  

The bulk of the work was from ~10:30am-1pm.  Most of the time before was getting folks in headsets and gear and getting equipment on.

Jennie W, Sheila, Elenna

In order to get data for mode-matching and for Elenna to get data to calibrate sideband heights we ran some mode scans after the SR3 heater was turned on last night.

16:55:24 UTC Carried out single bounce OMC scan at 10W PSL input with sensor correction on HAM6 on, high voltage on for PZT driver in HAM6, sidebands off , SRM mis-aligned, ITMY mis-aligned, DC 3 and 4 on, OMC ASC on.

Excitation freq changed to 0.005 Hz as the top peak of the TM00 mode looked squint so could have been saturating. Lowering this frequency prevented this.

Ref 15-17 corresponds to dcpd data, pzt exc signal, pzt2 dc monitor.

Then mis-aligned ITMX and aligned ITMY (Sheila had to re-align SR2 to centre on ASC-AS_C).

Measurement starts at 17:08:18 UTC.

Ref 18-20 corresponds to dcpd data, pzt exc signal, pzt2 dc monitor.

Traces saved in 20250516_OMC_scan.xml. The top left plot is the first scan bouncing beam off ITMX, the second scan is the bottom right bouncing off ITMY.

The top right is the two plots of the PZT2 DC voltage monitor. That is, the current voltage applied to the PZT. The bottom left is the plot of the voltage ramp applied to the PZT2 on the OMC for this measurement.

The ndscope attached shows the power in mA transmitted through the OMC on the top, then the PZT used for the scan DC voltage underneath, then the input PZT voltage underneath that, then the reflected power from the OMC in mW, then at the bottom the SR3 heater element temperature in degrees.

Elenna did two more scans in single bounce with sidebands back on and different modulations depths in each.