Thurs DAY Ops Transition

TITLE: 01/15 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: 9mph Gusts, 5mph 3min avg
    Primary useism: 0.03 μm/s
    Secondary useism: 0.25 μm/s 
QUICK SUMMARY:

JAC work continues with IOT2L being rolled up to HAM2 this morning for [IOT2 will be later today or Fri] alignment checks & IMC locking.  Equipment moves in LVEA and from EY, and I believe there is more Squeezer alignment as well at HAM7.

HVAC Fan Vibrometers FAMIS Check (FAMIS 39850)

For FAMIS #39850: All fan trends look nice and flat.

HAM7 beam aligned to HAM6

Kar Meng, Sheila

This afternoon we aligned the squeezer beam to AS_C, AS_A, and AS_B QPDs.  This is currently done with OM1, OM2, SRM, and ZM6 at the same alignment they were at in the end of O4.  That means that the beam location on ZM5 should be the same as it was at the end of O4 (75732).  With this alignment, we are using up most of the actuator range on ZM4, so we will either have to move ZM6 and the spot position on ZM5, or mechanically yaw ZM4.  We can't easily reach ZM5 with an IR card to check if the beam position on it is centered, if we can find a way to get an IR card on a long stick to asses that centering that would be helpful.  

As part of this, we set up alignment loops from AS_A to ZM4 and AS_B to ZM5, they are slow but reliable.  I will attach a screenshot of settings here tomorow.

We also checked the alignment of the beam onto the CLF FIBER rejected PD, which was off because the fiber collimator was tilted to realign the the new OPO cavity axis.  Kar Meng adjusted the pitch of the TFP, then slid the PD to center the beam in yaw, and lastly yawed the PD to make sure the reflection was going nicely to the black glass V.  

 

Wed DAY Ops Summary

TITLE: 01/14 Day Shift: 1530-0030 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
INCOMING OPERATOR: None
SHIFT SUMMARY:

Today's big activities:  JAC alignment continues  at HAM1.  SUS model/daq work continues from Control Room and CER.  HAM7 squeezer alignment continues.
LOG:

• 1545 sus model/daq begins with daq restart (jonathan/cds)
  • 1810 CER (olli,jeff)
  • 1828 CER for power supply rack install (marc)
  • 2124 Oli left + Marc went out again to help with AntiAlias issue.
  • 2228 Jeff confirms Marc's work was complete and CER work is done.
• 1556-1704 LVEA technical cleaning, checks, prep (kim.nellie)
  • 1758 Kim back to LVEA
• 1653-1937 Checking lasers and taking meeting in PCal Lab area (tony)
• 1713 nuc20 restarted for a new CDS Overview (dave)
•  1743-2337 Y-arm trailer moves to EY (randy)
• 1747 HAM1 JAC begins morning work(Masayuki)
  • 1811 -1855 Rahul
  • 1814-1842, 1934- Jennie
  • 1913 Betsy running parts out
• 1845-1854 Parts search (travis)
• 1936-1942 Checking light fixture in LVEA (eric)
• 2017-0008 HAM7 alignment work continuing (sheila,karmeng)
  • 2207 Sheila/Karmeng out for control room work
  • 2309 Sheila/Karmeng back to HAM7
• 2119 JAC Alignment for afternoon (jennie,masayuki,keita)
  • 2119 Gerardo joining to help with VAC/viewports
  • 2155 Jennie out
  • 2306 Jennie, Jason heading to HAM1
  • 2336 Rahul out, 2359 Jason out
• 2150-2354 Switching integrating spheres in PCal lab (tony)
• 2200-2235 putting panels back on chasis in CER (dave)

SUS-C1 and SUS-C6 AI Chassis Modified, SUS-C2 Modified AI Chassis Installed

Marc, Jeff, Fil, Oli

Yesterday we pulled most of the AI chassis (D1000305 or D1600077) from SUS-C1 and SUS-C6, modified them for ECR E2400409 and E2500296 (IIET 35739 and 35706, respectively), and reinstalled them as part of our work converting SUSB123 and SUSH34 into SUSB13 and SUSB2H34 (88765). 

Every AI chassis in SUS-C1 and SUS-C6 was meant to be pulled, upgraded, and reinstalled EXCEPT SUS-C1 U24. Additionally, we needed to also modify a spare D1000305 AI chassis for installation into SUS-C2. We did all this, but along the way we accidentally also pulled and upgraded the AI chassis in SUS-C1 U24 (previously S1104380). Luckily, we hadn't modded the spare (S2100712) yet so we installed it into SUS-C1 U24 and installed that modified chassis in the SUS-C2 U14 spot.

Here are the steps for how we modified the AI chassis:
- Disconnected all affected AI output cables in SUS-C1 and SUS-C6
- Removed the existing 6x 2x 8CH DAC AI chassis (D1000305 or D1600077),
- Modified them to become D2500353 1x 32CH AI chassis 
    . Replaced the 2x 8CH AI rear panel with WD relays (D1000551) with 1x 32CH AI rear panel without WD relays (D2500097)
    . Replaced the 2x 8CH back panel (D1000552 with 1x 32CH back panel (D2400308)
- Relabeled AI chassis from D1000305 to D2500353, or from D1600077 to D2500397, and reinstalled
- Cabled everything up according to the corresponding version of the wiring diagram (SUSB13, SUSB2H34)

Pulled, upgraded, and reinstalled:
                                            D1000305 > D2500353     D2500097
SUS Chain               Rack / Position     Chassis S/N             Rear Board S/N     32CH DAC Card / IO Slot    Channels
ITMY M0/R0/L1           SUS-C6 / U38        S1108073                S2501317           DAC0 / Slot#2              0-15

ITMX M0/R0/L1           SUS-C6 / U37        S1108072                S2501319           DAC0 / Slot#2              16-31

ITMY L2, ITMX L2        SUS-C6 / U35        S1108074                S2501316           DAC1 / Slot#4              0-15

MC2 M1,PR2 M1,SR2 M1    SUS-C1 / U31        S1104379                S2501321           DAC2 / Slot#5              0-15

SR2 M1, MC2 M2/M3       SUS-C1 / U30        S1104368                S2501320           DAC2 / Slot#5              16-31

                                            D1600077 > D2500397
                                            Chassis S/N
ITMX ESD, ITMY ESD      SUS-C6 / U21        S1600245                S2501318           DAC1 / Slot#4              16-27

Upgraded and newly installed (technically was pulled from SUS-C1 U24 by accident):
BS M1/M2                SUS-C2 / U14        S1104380                S2501322           DAC3 / Slot#6              0-11

 

NOT upgraded but chassis swapped:
                                                    D1000305              D1000305
SUS Chain                        Rack / Position    Chassis S/N Before    Chassis S/N Now    
PR2 M2, PR2 M3, SR2 M2, SR2 M3   SUS-C1 / U24       S1104380              S2100712

CER Hardware/Electronics Changes To Convert SUSB123 and SUSH34 to SUSB13 and SUSH34 Complete; User Model Software Changes Commencing

J. Kissel, F. Clara, O. Patane, M. Pirello, D. Barker
ECR E2500296, E2400409
WP 12962
D2300401 (for susb13) and D2300383 (for susb2h34)
G2301306 -- PARTII 2023 plan, PARTII Update 

We've completed all electronics hardware moves, cabling/recabling and new installations that we plan to do on SUS MC2, PR2, SR2, BS, and the future LO1 and LO2 for now.

Given that this change to the electronics is somewhere in between versions of the D2300401 h1susb13 and D2300383 h1susb2h34 wiring diagrams -- the interim configuration we're in now that 

    Does have
        - susb2h34 and susb13, as well as susauxb13 and susauxb2h34 with all their ADC and DAC cards, as they will be in O5.
        - All of the BS electronics have been moved from SUS-C5/SUS-C6 to SUS-C1/SUS-C2, and their CER cabling dragged along with it
        - all AI chassis driven by 28-bit 32CH DACs (7 in total) have been converted from a pair of D1000305 2x8CH DAC AIs to a pair of D2500353 1/2x32CH DAC AIs.
        - ITM AA chassis inputs (both OSEM sensors, optical levers, and CD monitors) and AI chassis outputs have been re-arranged such that the grouping is far more sensibly arranged and modular per QUAD.
    
    Doesn't have 
        - BBSS-like BS TOP mass converted to QOSEMs
        - BBSS-like BS M3 OSEM sensing and actuation electronics
        - Any LO1 or LO2 electronics
        - The BS optical lever in its final AA chassis position (because the BS TOP mass OSEMs still need that spot)
        
        - Any changes to the field cabling
            - the BS M1 satamps, M2 satamps, and M3 optical lever whitening chassis are all still in SUS-R6)
-- we planned /documented all of this work on google slides -- see PARTII Update -- which is linked in the abstract of G2301306.

We'll add more details, gotchas, and pictures below in the comments.

Wed CP1 Fill

Wed Jan 14 10:10:16 2026 INFO: Fill completed in 10min 12secs

 

CDS BS move and LIGO-DAC upgrade

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

WP12962 Move BS for upgrade to BBSS. WP12901 Upgrade ITM to LIGO-DAC

On Tuesday 13Jan2026 we reconfigured the BSC1,2,3 and HAM3,4 suspensions to move the BS control from h1susb123 to h1sush34 and upgrade the ITM test mass suspensions to use the new LIGO-DACs. Associated changes were also made to these systems' SUS-AUX frontends.

Frontend Computer Renaming:

old name	new name
h1susb123	h1susb13
h1sush34	h1susb2h34
h1susauxb123	h1susauxb13
h1susauxh34	h1susauxb2h34

Prep Work:

The 4 LIGO-DACs used for this upgrade were calibrated in the EE shop and FE tested on the DTS.

The EDC was moved from h1susauxb123 to h1susauxh56

Upgrade:

The h1susb123 and h1sush34 suspensions were SDF reconcilled and put into their safe state.

The SWWD seismic systems were put into an infinite bypass.

All 4 front end were powered down and work on their IO Chassis, AAs and AIs started.

h1susb13 IO Chassis

8 20bit-DACs removed, 2 LIGO-DACs added.

Removed 20bit-DACs

20bit-DAC	18/20bit-DAC Interface Card
200217-17	S1200228
220218-29	S1200227
210303-49	S1200224
210303-35	S1200219
210303-22	S1200220
200217-19	S1200221
210303-57	S1200226
220218-08*	S1200229

* 20bit-DAC 220218-08 installed in new h1susb2h34 chassis.

New Adnaco Layout

Adnaco slot	Card [interface]		Adnaco slot	Card [Interface]
A1-1	LIGO Timing Card		A3-1	empty
A1-2	empty		A3-2	empty
A1-3	ADC0 (orig)		A3-3	empty
A1-4	LIGO-DAC0 S2500457 [010]		A3-4	empty
A2-1	ADC1 (origin)		A4-1	BIO0 (orig)
A2-2	LIGO-DAC1 S2500448 [011]		A4-2	BIO1 (orig)
A2-3	empty		A4-3	BIO2 (orig)
A2-4	empty		A4-4	empty

h1susauxb13 IO Chassis

Removed last 2 ADCs, installed them in h1susauxb2h34 IO Chassis. ADC count went from 8 to 6.

h1susauxb2h34 IO Chassis

Added the 2 ADCs from h1susauxb13 in next available slots. ADC count went from 6 to 8.

ADC	ADC Card	Interface Card
ADC6	110128-11	S1102417
ADC7	110128-03	S1301433

h1susb2h34 IO Chassis

Original layout skipped Adnaco slot A2-4. Reviewed as-built drawings and alog but could not find why this slot was not being used. Assuming that there was something wrong with this slot I replaced the second Adnaco backplane

Suspect Backplane (removed)	C8610415
New Backplane (installed)	C8610796

Original layout was:

2 ADC, 5 18bit-DAC, 1 20bit-DAC, 2 BIO.

Update: keep the 2 ADCs, remove all 5 18bit-DACs, keep the 1 20bit-DAC and add a second 20bit-DAC, add 2 LIGO-DACs and add a third BIO.

Table of removed 18bit-DACs + IF

18bit-DAC	Interface Card
110425-10	S1104013
101208-71	S1104017
110425-04	S1104014
110425-09	S1104023
110425-46	*

* Because the 18bit and 20bit DACs use the same Interface card, this IF card was left in the chassis for the second 20bit-DAC

New Adnaco layout

Adnaco slot	Card [Interface]		Adnaco slot	Card [Interface]
A1-1	LIGO Timing Card		A3-1	empty
A1-2	empty		A3-2	empty
A1-3	ADC0 (orig)		A3-3	empty
A1-4	20bit-DAC0 (orig)		A3-4	empty
A2-1	ADC1 (orig)		A4-1	BIO0 (orig)
A2-2	20bit-DAC1 *		A4-2	BIO1 (orig)
A2-3	LIGO-DAC0 S2500454 [012]		A4-3	BIO2 ADRBS96001188
A2-4	LIGO-DAC1 S2500442 [013]		A4-4	empty

* 20bit-DAC1 ss0218-08 repurposed from h1susb123 surplus.

Timing Card Firmware Upgrade (Marc)

All 4 IO Chassis Timing Cards had a firmware upgrade. This was essential for the control frontends, which would not be able to drive the LIGO-DACs without the new firmware. The SUS-AUX TCs were upgraded as part of the general upgrade of all frontends.

	Tming Card Firmware Version
old	1 - 0x1f0
new	2 - 0x635

 

Model Changes and Current Status

h1iopsusb13	New model name, installed but needs SWWD review
h1susitmx	Not running, being reworked
h1susitmy	Not running, being reworked
h1susitmpi	Not running, being reworked
h1iopsusb2h34	New model name, installed but needs SWWD review
h1susbs	New location, not running, being reworked
h1susmc2	Not running, being reworked
h1suspr2	Not running, being reworked
h1sussr2	Not running, being reworked
h1iopsusauxb13	New model name, running and complete
h1susauxb13	Temporary model running, being reworked
h1iopsusauxb2h34	New model name, running and complete
h1susauxb2h34	Temporary model running, being reworked

All models are being built with RCG5.5.2, which is needed to drive more than 1 LIGO-DAC.

Wed DAY Ops Transition

TITLE: 01/14 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: 6mph Gusts, 4mph 3min avg
    Primary useism: 0.03 μm/s
    Secondary useism: 0.45 μm/s 
QUICK SUMMARY:

Foggy morning on site where the LVEA continues to be in Laser HAZARD for in-chamber work at HAM1 & HAM2.  

MuseumEXP continues with new-exhibit work at LExC this week.

Locking JAC in air

Jennie W, Masayuki N

 

Daniel set up some model changes last week in h1lsc to allow us to use the JAC-TRANS_A DCPD to lock the cavity. This is a workaround of what is intended to be the normal operation where the locking is done with the JAC-REFL_A PD on IOT1. Rolling this table up to the chamber would make it hard to install the optics on that side of the table so we need this workaround to see the beam transmitted through the cavity that we can use to align the beam from JAC into the IMC.

This PD is just a DC PD so we cannot use PDH to lock as we would for the REFL PD. Yesterday and today Masayuki and I worked on an offset lock, where we use the transmitted power offset to the side of the fringe after normalising the error signal by the maximum transmitted power on resonance.

Use JAC Overview->DITHER. The demodulation is set up so the SIN gain is one and connects to I filter bank which also has a gain of 1. Q filter bank is terminated at the output.

First step is to use the ramp on JAC Overview -> JAC-PZT_Driver by pressing "ENABLE" in right-hand corner, the slider on the left side needs to be near -10V for this to work. Measure the max peak height of the TM00 mode - transmitted power off resonance.

The normalisation is done using the high pass filter bank block at the left of the screen, this opens up H1JAC-DITHER_PD_IN. The gain should be set to the normalisation constant, 1/(transmitted power on resonance - transmitted power off resonance).

The actual servo shaping is done using H1JAC-DITHER_SERVO, which is linked on the right of the 'DITHER' screen. Set the offset to -0.6 to shift the normalised error signal so the zero crossing is just below halfway up the fringe. Check the input and output of the filter bank after the servo are turned on, this is linked on the right of the 'DITHER' screen and is called 'PZT'.

Make sure the PZT ramping is turned off by pressin 'DISABLE on the  JAC-PZT_Driver screen.

Turn on the UGF100 and LP10 filters in the 'H1JAC-DITHER_SERVO' filter bank. These have a gain of 3000 and a low pass filter which rolls off at 10Hz respectively. This latter one is to invert the PZT response.

The gain in this filter bank should be on, use the slider on the 'DITHER' screen to tune to a TM00 peak and then turn on the servo output. Once locked you can turn on the Int1Hz filter to add an integrator below 1Hz and the boost to give an extra 5x gain.

---

For a better lock we also implemented a proper DITHER SERVO.

The dither frequency is set to 2.5KHz and the demod phase is set at 0 degrees. The input signal no longer had normalisation in H1JAC-DITHER_PD_IN as the error signal will now be the beat between the PZT dither and the cavity transmitted power and so has a zero crossing at the centre of resonance.

There is a high pass filter in  H1JAC-DITHER_PD_IN to avoid up-conversion of noise below 1 kHz. After the demodulation both 'I' and "Q' filter banks have a low pass filter at 1kHz to prevent 2.5kHz and harmonics from getting magnified by the loop.

Both I and Q phase now have a low pass filter at 1KHz to prevent harmonics of the dither frequency appearing in the error signal. The locking technique is the same after this point as the filters needed in the 'SERVO' block do not change as the actuator response has not changed.

Masayuki has set up both these locking processes in the JAC guardian but this is still WIP.

 

Power supply at EX failed killing EX ISI cps timing

RyanS told me yesterday that he could re-isolate the ETMX ISI. I finally got to looking at it today and something was off with the CPS. Using the weekly CPS spectra script I got ASDs for the CPS from last night and a bunch of the the CPS spectra were way off, first image.

I went to EX and looked at racks, SEI chassis all looked fine. I unplugged a couple of CPS probes at the chamber and did not get the expected behavior. One CPS went to the near limit rail (-32k) the others hardly changed at all. This made me suspect timing, so I traced out the timing sync wires, found the 71Mhz CPS timing fanout and the lights were all off. Looked at the power strip and only the -18v led was on. Turned off the fanout chassis, took some pics and found Marc and Fil.

Marc came to the end and we looked at power supplies in the front of the building and the +18 for the rack was dead. We swapped both power supplies for spares, and CPS timing seems to have come back, I was able to isolate the ISI. Marc said the fans seemed a bit stiff and smelled weird, so maybe another fan failure.

Replaced Kepco Supplies EX, ISC-R1 +/- 18V

Per WP12970

ISC-R1 +18V supply failed this afternoon.  This set was slated for replacement, so we replaced both legs.

+18V S1300287 was replaced with S1202002 with new ball bearing fan installed.
-18V S1300275 was replaced with S1201995 with new ball bearing fan installed.

M. Pirello, J. Warner

Tue CP1 Fill

Tue Jan 13 10:09:38 2026 INFO: Fill completed in 9min 34secs

 

Ops Day Shift Summary

TITLE: 01/14 Day Shift: 1530-0030 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
INCOMING OPERATOR: None
SHIFT SUMMARY: Another busy day of upgrades; JAC installation and HAM7 beam alignment continued while the move/upgrade of BS DACs began today and should wrap up tomorrow morning. Jim also discovered a failed power supply at EX which looks to be the reason the chamber can't be recovered, so he and Marc are starting to take action there.
LOG:                                                                                                                                           

Start Time	System	Name	Location	Lazer_Haz	Task	Time End
----	SAF	HAZARD	LVEA	YES	LVEA is Laser HAZARD	Ongoing
16:27	FAC	Kim, Nellie	LVEA	-	Technical cleaning	17:18
16:41	CDS	Marc, Fil, Oli	CER	-	SUS computer upgrades	20:22
16:49	CDS	Jeff	CER	-	SUS computer upgrades	21:04
16:49	CAL	Tony	PCal Lab	Local	Check measurement	20:17
17:01	JAC	Rahul	LVEA	Y	JAC installation	19:42
17:24	SQZ	Sheila, Elenna, Kar Meng	LVEA	Y	HAM7 SQZ beam alignment	18:25
17:27	JAC	Jennie	LVEA	Y	Opening light pipe	17:33
18:30	CDS	Dave	CER	-	susb123 DAC upgrades	22:33
18:32	JAC	Masayuki	LVEA	Y	JAC installation	19:42
18:55	SQZ	Elenna	LVEA	-	Replacing viewport cover	19:07
18:56	VAC	Gerardo	EX	N	Troubleshoot AIP	19:36
18:57	FAC	Kim	EX	N	Technical cleaning	19:36
19:24	FAC	Tyler, MacMiller	FCES	N	Air handler work	22:33
20:01	CDS	Richard	CER	-	Checking progress	20:30
20:22	CDS	Fil	MY	N	Picking up cables	23:09
20:22	CDS	Oli	CER	-	SUS computer upgrades	21:05
21:11	VAC	Gerardo	EX	N	Troubleshoot AIP	21:30
21:13	CAL	Tony	PCal Lab	Local	Getting serial numbers	00:08
21:17	VAC	Travis	LVEA	-	Looking for parts	21:24
21:45	CDS	Jeff	CER	-	SUS computer upgrades	00:18
21:51	JAC	Jennie, Rahul	LVEA	Y	JAC installation, Rahul out @ 22:47	01:25
22:10	JAC	Masayuki	LVEA	Y	JAC installation	01:25
22:24	CDS	Oli	CER	-	SUS computer upgrades	01:11
22:35	JAC	Betsy	LVEA	-	Check on JAC progress	22:47
22:35	JAC	Keita	LVEA	-	JAC installation	01:25
22:35	PEM	RyanC	CER	-	Grabbing DM stand	22:38
22:54	CDS	Marc	MY	N	Getting parts	23:11
23:10	CDS	Fil	CER	-	SUS computer upgrades	01:10
23:23	SQZ	Sheila	LVEA	Y	Opening HAM7 viewport cover	23:29
23:52	SEI	Jim	EX	N	Checking electronics	00:25
00:02	VAC	Travis	Mids	N	Looking for parts	00:31

HAM7 early part of this week

Sheila, Kar Meng, Elenna, Jim

Yesterday Jim and I went to the chamber in the morning to work on cables. We got a solution for the cables after some work, but one peek zip tie luanched itself across the chamber.  We spent a few hours searching for this; I climbed into the chamber on the -X side and could them see it on the bottom of the +Y door where Jim was able to reach through the port and retreive it.  

In the afternoon Kar Meng and I went back to the chamber and found that the beam was blocked on the cable clamp that Jim and I had added earlier.  The previous cable routing is shown here, the peek cable clamp is on the bottom of the pillar so that it doesn't block the beam.  We removed the new alumium clamp and I tried to move it lower, the second from the top bolt hole is not the right size so we need to place this in the 3rd from the top hole.  I found that difficult to reach and eventually decided to leave it for another day or ask for help from someone with longer reach.  

After this we saw that our beam did arrive on AS_C in HAM6 but wasn't aligned onto AS_A or AS_B.  

This morning Elenna, Kar Meng and I went to the chamber to see if we could improve the alignment.  We walked B:M3 to align onto the second iris on SQZT7, and B:M4 to align onto the iris in front of ZM4, which seems degenerate with the iris at the bottom of the SQZT7 periscope.  This worked well and we could see light on AS_B and AS_C although nothing on AS_A.  We then went to the control room and moved ZM6 to center on AS_C better, then we could engage the AS centering loops.  

This afternoon Kar Meng and I had another look at alignment from the control room.  We have set the OMs back to their alignments during the run, and we still have the beams on AS_C, AS_A and AS_B although we are using a lot of the range on ZM6.  

Still to do before finishing in HAM7:

• adjust alignment to relieve range on ZM6
• add cable clamp on bottom of OPOsus pillar near B:M4, without blocking beam
• Photos of cables as we are leaving them
• unlock VIP
• photos of iris locations and beams on them
• power budget measurements:  with power meter at various points on VIP, seed reflected power and seed power to homodyne path
• realign beam onto FC QPDs 
• check alignment onto other photodiodes in chamber
• remove irises
• unlock ISI, SUS and ISI checks

HAM1 update - added some lenses and mirrors for JAC

Masayuki, Jennie, Rahul

Given below are the list of lenses and mirrors I have placed on the ISI table and roughly positioned (without the beam for now) them as per following drawings  - D2500344 and D0901821.

Lenses - L1, L2 and L3: Masayuki confirmed from the vendor that the arrow mark on the lens point towards the convex side. For lens L1, arrow is pointing against the PEEK ring (in the lens holder). For Lens L2 and L3 the arrow is pointing towards the PEEK ring. The PEEK ring for all three lens are facing towards the HAM2 chamber. In other words, curved surface of L1 is facing towards the PSL and for L2-3 towards HAM2.

I re-cleaned L1 lens after finding some dust particles on the curved surface, post cleaning the lens looked better.

Reflecting mirrors - JAC-RM1, JAC-RM2, JM2 and M3.

Masayuki and I also added a temporary Siskyou mount acting as JM3 (for Tip Tilt, just like JM1). We will replace both of them with the Tip Tilt next week.

Next, we proceed with aligning/pointing the above optics with the beam. L1 and JM2 are already decently pointing (although without a locked JAC) towards JM3.

VOPO measurement setup

Attached is the mode-matching layout for the VOPO. The target primary waist of the VOPO (from TT1700104) is 221.2um(s), 206um(t) for 1064nm and 159.2um(s), 148.8um(t) for 532nm.

The mode matched minor and major beam waist is 198.6um, 204.2um for 1064nm and 152.6um, 185um for 532nm. For the fundamental injection via the rear mirror, the measured waist is 197.25um, 231.85um. These waist is measured at the position marked with a "star". The mode-matching calculation has been reviewed by a fur-low scientist.