Recleaned JAC mirrors

Jennie W, Masayuki,

 

Today Masayuki and I went into the optics lab for some JAC prep.

• He crimped the connectors onto the PZT wires after we cut off the soldered end and stripped some of the insulation away last week.
• We removed the tranport end caps which protect the mirrors.
• Masayuki also wiped down the top of the JAC.
• We took the JAC ASSY onto the flow bench, removed the mirror/mirror-cap assys and used FC to clean the HR surfaces.
• We checked the cable connection between the pins and the solder joint on the PZT ring.
• We used the top gun to blow off dust from the HR and A R surfaces and re-installed the end caps.
• We will leave the JAC assy covered on the flow bench as we still need to install some cable routing.
• Our other parts for the JAC damper are in the clean room right behind the flow benches under some foil. The quarter of the bench not covered by foil needs wiping again but can be used for other assembly.

CHETA build log -- Monday 12/15

M. Todd, G. Vajente, L. Dartez

---

Monday 12/15

1. We went through a checklist of things that still needed to be mounted, and decided to change the layout of laser position a bit to include a dogleg so that the laser connector had more room, free from the cable connectors near the feedthrough panel
2. Redesigned the feedthrough panels, now the same design can be used for all 4 tables (2 at each site) – and got a quote to be ordered
3. Connected and tested the laser interlock 
4. Mounted and installed laser (SN 0918) & cooler, confirmed that it draws current & delivers a reasonable amount of power as read out on the powermeter
5. Assembled pedestals for the lenses & various optics using assorted spacers to ensure center of all optics is at 4” height
6. Started a cart for additional components that we’ll need since we’re dipping into table 2 parts due to the adjustments we’re making to the layout

 

To Do:

1. Finish mounting the mirrors in the flipper mount (supposed to be a double mirror)
2. Mount the ZnSe QPD 2” lens.
3. Implement the dogleg
4. Align the optics
5. Profile the laser where the translation stage is now or where the beam is supposed to be going.
6. Integrate the power meter into a laptop with a usb?

Replacing failing disks on cdsfs0 and cdsfs1

Another disk showed problems on cdsfs0, so I replaced it was a spare.

Cdsfs1 has numerous problems.  Zpool status is noting that sdl, sdh, sdp, sdo are bad.  It looks like the io slot for sdl may be bad (I tried replacing the disk and the system could not see it).  I replaced the sdh disk and got it resilvering.  Then sdp started resilvering (which was unexpected). I'm going to wait and see how this resilvering goes before I proceed.  The activity lights do not match my model of what zpool status is telling me.  This is an old box, and replacement/retirement may just be the better path for it.

HAM1 ISI is locked, tabletop payload adjusted for JAC install

After doors came off this afternoon, I went to HAM1 and locked the ISI. Mitch then helped with rearranging a lot of the mass on the table to match the new layout in v6 of D1200524 : https://dcc.ligo.org/DocDB/0089/D1200524/006/D1200524-v6.PDF

We left the two stacks off of the +X side of the table. None of the stacks are currently on viton, I didn't want to leave any loose stacks while JAC was installed. We will rectify that when they are done. I will try to get pictures of the current table layout tomorrow.

HAM1 is Vented and Doors are Off

(Jordan, Travis, Randy, Jim, Tyler, Gerardo)

Volume for HAM1 was vented this morning, no issues encountered during the process.  HAM1 ion pump was isolated before the vent.

Annulus system for both HAM1 and HAM2 was vented with nitrogen gas, both ion pumps were turned off before the annulus system was vented.

Bolts were removed for both doors, we left 4 bolts on each door and then broke for lunch.

After lunch both doors were removed, -Y door had a stubborn O-ring, but we managed to place it back into its dove tail groove, good O-ring.  Similar issue for the +Y door, inner O-ring was stuck to the door and it just did not want to stay put, we used the O-ring protectors to persueade it to stay in the groove.

Jim locked the table, then with his help the septum viewport protectors were installed.

Jim and Mitch have the chamber now.

 

CDS Upgrade Summary: Monday 15th December 2025

Merge h1sush2a/2b to form h1sush12

Jeff, Oli, Fil, Marc, Erik, Jonathan, EJ, Dave

h1sush2a was upgraded to become h1sush12, with h1sush2b being powered down for now.

In the MSR, the supermicro W2245 h1sush2a was removed from the rack and in its place the new W3323 h1sush12 was installed. The IX Dolphin card and cable was transferred to the new machine.

In the CER H1SUSH2A IO Chassis was upgraded to become H1SUSH12:

The ADC was removed from sush2b to become the third ADC in sush12.

All the 18bit DACs were removed.

3 LIGO-DACs were installed, along with a new 4th ADC.

The 3 Binary cards were left in place. In fact their cables were long enough to remain attached while the chassis was pulled out from the rack.

New models for h1iopsush12, h1sus[mc1,mc3,prm,pr3,im,ham1] were added. Note that h1sushtts is now called h1susham1. A DAQ restart was needed.

More details will follow.

New ASCIMC, LSC models

Jennie, Dave:

New h1ascimc and h1lsc models were installed. A DAQ restart was needed.

Beckhoff changes

Daniel, Dave:

Daniel installed new CS-ISC beckhoff PLC. A DAQ restart was needed.

DAQ Restart

Dave, Jonathan.

The DAQ was restarted for:

retire iopsush2a, iopsush2b. Add new iopsush12

h1sush12 user model changes

new h1ascimc and h1lsc models

EDC restart for ECAT CS ISC.

Mon CP1 Fill

Mon Dec 15 10:07:40 2025 INFO: Fill completed in 7min 37secs

 

Ops Day Shift End

TITLE: 12/16 Day Shift: 1530-0030 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
INCOMING OPERATOR: None
SHIFT SUMMARY: Both HAM1 doors off, the ISI is locked, and table masses are being moved. the sush12 front end has been swapped and is back up but the single suspensions aren't quite right yet. HAM7 OPO work continued. Norco came this afternoon and filled CP5. Corner station is still under vacuum. Also, it's windy.
LOG:

Start Time	System	Name	Location	Lazer_Haz	Task	Time End
15:57	SAF	LASER	LVEA	N	LVEA is Upgrade Phase LASER SAFE \u0d26\u0d4d\u0d26\u0d3f (\u2022_\u2022)	10:51
16:03	SYS	Randy	LVEA	n	Craning pallets, prepping areas for doors off	18:13
16:47	SYS	Jason	LVEA	n	Check in with Randy and help out there	18:19
16:48	SUS	Rahul	Opt Lab	n	Checking on parts	16:49
16:53	CDS	Fil	LVEA	N	Disconnecting ISCT1	17:49
16:55	PEM	TJ	LVEA	N	Turning on HAM1 DM and checking HAM6 DM	17:24
17:00	AOS	Betsy	LVEA	N	Bellows removal prep	18:50
17:04	VAC	Jordan, Travis	LVEA	N	HAM1 vent prep, CS vent	20:11
17:07	CAL	Tony	PCal Lab	Local	Setting up measurement	17:14
17:13	PEM	Robert	LVEA	N	Investigating cable	17:19
17:21	SAF	RyanS	LVEA	n	Transitioning to Upgrade SAFE	17:37
17:49	SUS	Jeff	CER	n	Helping Fil with SUS chassis	23:18
17:49	CDS	Fil	CER	n	SUS h12 chassis work	00:58
17:57	FAC	Kim, Nellie	LVEA	n	Tech clean	17:58
18:14	TCS	Matt, Louis, Gabriele	Prep lab	n	Cheta table prep	19:58
18:25	FAC	Kim, Nellie	LVEA	n	HAM1/2 cleaning	19:38
18:35	SQZ	Jennie	LVEA	n	SQZ table peek	19:20
18:39	SEI	Jim	LVEA	n	Locking HAM1 HEPI	19:03
18:50	SYS	Randy	LVEA	n	Checking in at HAM1	22:52
18:53	SQZ	Sheila, Kar Meng, Eric O., Daniel D.	LVEA	N	OPO installation in HAM7	20:11
19:02	VAC	Gerardo	LVEA	N	HAM1 venting	20:11
19:22	SEI	Jim	LVEA	N	Prepping for chamber work; looking at parts	19:28
19:37	AOS	Betsy	LVEA	N	Checking on things	19:41
20:42	SYS	Betsy	LVEA	n	Checking on cleanroom	21:23
21:10	VAC	Gerardo, Travis, Jordan	LVEA	n	HAM1 Doors (Travis out at 2258)	23:14
21:22	CDS	Daniel	CER,CR	n	Beckhoff work	00:05
21:25	CDS	Erik	FCES	n	Looking for Wifi	21:46
21:36	ISC	Corey	Opt Lab	n	Looking for peek zip ties	21:45
21:38	SQZ	Sheila, Kar Meng, Eric O, Daniel D	LVEA	n	HAM7 OPO work (Sheila out at 0006)	00:14
21:42	OPS	Richard	LVEA	n	Checking on teams	00:10
21:46	IO	Jennie, Masayuki	Opt Lab	n	JAC prep	01:06
22:08	VAC	Norco	MX	n	LN2 fill	00:23
22:10	SUS	Rahul	Opt Lab	n	Optics cleaning and setting down JMs	22:31
22:25	SYS	Betsy	LVEA	n	Check on HAM1	22:52
22:25	SQZ	Jim	LVEA	n	HAM7 help	02:11
22:50	FAC	Tyler	LVEA	n	HAM1 help	22:51
22:59	SYS	Betsy	LVEA	n	Checking on vent teams	00:51
23:03	SEI	Mitchell	LVEA	n	HAM1 locking with Jim	01:03
23:29	VAC	Jordan, Travis	LVEA	N	Relay tube vent prep	00:05
23:57	SUS	Rahul	Opt Lab	n	Dropping off parts	00:00
23:58	FAC	Tyler	Xarm	n	Tumbleweed clearing	00:58
00:06	PCAL	Tony	PCAL lab	local	Sphere swap	01:06
00:16	CDS	Marc	LVEA	n	Installing JAC heater cable	01:16

Recabling OPO in HAM7

[Sheila, Eric, Jim, Kar Meng, Daniel D.]

When we started working this morning, the particle counts were 20/10/10 per cubic foot

It looked like the old cable for the PZT that needs to be replaced was routed to back into the chamber to a cable bracket which was far from reach. Before we can remove it, we need to find the cable harness plan for HAM7.

In the mean time, we were able to re-route the TEC cable using photos from this alog. 

### Broke for lunch ###

Over lunch, we determined the correct connector for the PZT/translation stage was on CB5 in HAM7. It's labeled cable #4 according to the wiring diagram. We also verified the correct operation of the TEC controller and the oven from CDS

After we returned, the particle counts were 0/0/0 per cubic foot and we uncovered the chamber to finish replacing the cables.

Unfortunately, cable #4 between CB5 (see image) and the OPO is terminated in a male molded connector, which is screwed into the connector bracket. This meant that we needed to remove the female cable (from the flange) from the rear of the connector and then remove the male connector (to OPO) from the cable bracket. Jim came in to help us reach the connector and he decided that it would be easier to remove the top and second-from-top connectors (3rd and 4th on CB5 in the wiring plan) from the bracket to make it easier to reach the ones for cable #4. Jim was able to remove the old cable and replace it with the new one in the bracket.

After Jim left, we were able to continue reinstalling the new cable. The longest DB-9 tentacle on the new cable is for the VOPO PZTs, the DB-15 is for the stage control, and the short DB-9 is a spare which was coiled to the side. We were then able to connect the piezo and stage control connectors to the OPO and roughly re-route the cabling on the ISI table. Final routing and securing of these new cables/checking for mistakes is still required.

 

RF distribution for JAC

A 5 dB attenuator was added at the input of the RF doubler for the JAC 43 MHz generation. This brought the input level to a nominal 10 dBm. 

Slow controls

Added the cabling for the new whitening concentrators. This also required a software upgrade.

The following QPD whitening channels were affected:

• IMC-MC2_TRANS
• IMC-IM4_TRANS
• PSL-ISS_SECONDLOOP_QPD
• PSL-BES_A
• ASC-POP_A
• ASC-POP_B

Instead of 4 x 8-bits, only 1 x 8 bits are used and all 4 segments are switched simulatanously. There is no change in the whitening interface for these QPDs, since the software already tied the segments together. The only change is in the readnback bits where only the last 8-bits are still significant.

This allowed us to add the whitening for the JAC WFS as well as dewhitening for the JAC PZT driver.

SUS-C3 and SUS-C4 AI Chassis Upgrades Complete; Merged sush12 ADC/DAC to AA/AI Chassis Cabling Installed

F. Clara, J. Figueroa, J. Kissel, M. Pirello
ECR E2400409 and E2500296 (IIET 35739 and 35706, respectively)
WP 12901
DWG D0902810-v12
DCN E2500341

Today we've gone forward with merging the sush2a and sush2b IO chassis, facilitated by upgrading those SUS's DAC cards to 32 CH, 28- bit DACs (D2200368). This entry covers the analog electronics and cabling that were impacted by the change, covering that all of the suspensions in, or soon to be in HAM1 and HAM2 -- MC1, MC3, PRM, PR3, IM1, IM2, IM3, IM4, RM1, RM2, PM1, JM1, and JM3.

We followed changes outlined in E2500341 which highlights the changes in the sush12 SUS electronics system drawing from D0902810-v11 to D0902810-v12. 
That required 
    - disconnecting all affected AI output cables in SUS-C3 and SUS-C4,
    - Removing the existing 6x 2x 8CH DAC AI chassis (D1000305), 
    - modifying them to become D2500353 1x 32CH AI chassis 
        . replacing the 2x 8CH AI rear panel with WD relays (D1000551) with 1x 32CH AI rear panel without WD relays (D2500097)
        . replacing the 2x 8CH back panel (https://dcc.ligo.org/LIGO-D1000552 with 1x 32CH back panel (D2400308)
    - re-installing, then
    - cabling everything up according to the D0902810-v12 version of the wiring diagram.

Here's the list of modified AI chassis serial numbers and assignment:
                                                     D1000305 > D2500353     D2500097
SUS Chain                     Rack / Position        Chassis S/N             Rear Board S/N          32CH DAC Card / IO Slot      Channels (Counting from 0)
MC1, MC3, PRM TOPs            SUS-C4 / U30           S1104370                S2501311                DAC0 / #2                     0-15
PRM, PR3 TOPs MC1 MID BOT     SUS-C4 / U29           S1104374                S2501315                DAC0 / #2                    16-31

MC3, PRM MID/BOT              SUS-C4 / U22           S1104375                S2501310                DAC1 / #4                     0-15
PR3 MID/BOT, RM1, RM2         SUS-C4 / U21           S1104378                S2501312                DAC1 / #4                    16-31

IM1, IM2, IM3, IM4            SUS-C4 / U10           S1104377                S2501314                DAC2 / #5                     0-15
PM1, JM1, and JM3             SUS-C4 /  U2           S1102760**              S2501313                DAC2 / #5                    16-31

** Technically, the (now) PM1, JM1, and JM3 AI chassis S1102760 was a 16-bit DAC AI chassis (D1101521) instead of a D1000305 at the start of today, and it didn't *need* the additional 16CH pass-through SCSI connection, but in the spirit of making everything the same, we elected to make it a full "new normal" D2500353 chassis.

Pictures of the now-D2500353 AI chassis rear boards and their connections. They're attached in the order of rear board serial numbers; the corresponding chassis number is listed above.

I Unmonitored OPO suspension channels that SUS_OPO sets in SAFE

While I was checking the suspensions this morning I noticed that the OPO sus guardian was in SAFE but there was still output going to the suspension. Trending the channels it looks like SDF revert was reverting the channels that the node had set in its SAFE state. I unmonitored these channels, see attached.

It looks like all other suspensions on this model are in a similar situation, but I'll wait to do those when the SQZ team isn't actively working in HAM7

HAM1 HEPI is locked

Because CDS got an early start on SUSH12 work, we had to bypass the IOP wd to reisolate HAM1 HEPI to lock. Otherwise this went as normal. Angular deviations are all still <5 urad, location deviations are all slightly larger, still below 10um though.

 

Ops Day Shift Start

TITLE: 12/15 Day Shift: 1530-0030 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
OUTGOING OPERATOR: None
CURRENT ENVIRONMENT:
    SEI_ENV state: MAINTENANCE
    Wind: 25mph Gusts, 19mph 3min avg
    Primary useism: 0.05 μm/s
    Secondary useism: 0.44 μm/s 
QUICK SUMMARY: Gate valves 5 & 7 closed, plan is to vent the CS and start the SUS CDS upgrade. Vent meeting at 830 in the control room today to coordinate.

Full into Vent Mode now, here is the current plan for the next few days.