HAM3-ISI tripped recently and needed to be turned back on. Commissioners noticed that the command buttons were not working anymore.

It turns out that someone ran an SVN update on the following file: /opt/rtcds/userapps/release/isi/common/scripts/HAMISItool, which was to be updated along with new models, screens and scripts, after testing at MIT. Having a model/script mismatch, the command script would be looking for inexistent channels, and fail.

I reverted HAMISItool to -r5830. This script should not be updated from the SVN again, until the latest HAM-ISI update gets propagated.

HAM3-ISI was turned back on with Isolation Lv3 and 01_28 blend filters. Target values were not changed to ensure returning to previous alignment.

Brett is visiting to measure specific modes of the QUAD, so this morning we setup equipment and prepped the QUAD for this.  Working around the ongoing TMS work, we clamped only the top mass of the main chain, and the UIM and PenRe of the reaction chain.  Richard laced some cables in order to access some temporary PEM channels for this use - the BNCs are running under the rollup door corner from the high bay racks.  Brett has a QPD setup on an IAS tripod which easily moves around the QUAD as he needs.

Here is the list of commissioning task for the next 7-14 days:

Green team:

1. Noise measurement between red and green.
2. Switch the arm cavity locking to red.
3. Make a mode scan of the red resonances.
4. ETM drive diagonalization
5. Commission the length feedback path to the ETM top suspension point to suppress microseism.
6. Asses the status of the reference cavity temperature controls.

Red team:

1. Center the red QPDs in EX.
2. Optimize 3f locking.
3. Investigate the robustness of the 3f lock in presence of an arm cavity.
4. Start commissioning the alignment system.
5. Optimize the thermal compensation of ITMY.
6. Investigate the REFLAIR45 whitening filter issue.

Blue team (ISCTEY):

1. Complete the feedthrough panels.
2. Install the on table cabling.
3. Prepare for move to the end station.
4. Check out ALS electronics in EY.

TMS:

1. Finish up with beam dumps and alignment.

SEI/SUS team:

1. Improve stability under high performance in ETMX.
2. Continue working on ITMY and BS.

In support of EY SUS installation installed 3 temporary BNC cables to PEM AA chassis
H1:PEM-EY_TILT_VEA_FLOOR_X
H1:PEM-EY_TILT_VEA_FLOOR_Y
H1:PEM-EY_TILT_VEA_FLOOR_T
For an ontrack photo diode readout.  

The Green Team was able to give up the machine for a moment and so the ISI was put back to where it should be.  The GT had Stage1 at Lvl2 with TCrappy and Stage2 with 750mHz blends at lvl1 Isolation.

Stage2 was ctrlDown'd but when Stage1 was ctrlDown'd it triggered Stage2 to damping only.  Stage1 was then Isolated with Lvl3; this now includes a 60Hz notch.  Stage2 was brought up to Lvl3 with TCrappys but after a minute or two it was obvious it was ringing up.  Stage2 was ctrlDown'd again and Isolated again with Lvl2 and TCrappy blends.

The Green Machine seems to be content with the performance for now.

The problem with the Position Target setting has not been investigated.

COMM PLL

• Polarity: OFF
• Gain: 31dB
• Common Filter 1: ON
• Common Filter 2: ON
• VCO Compensation: ON
• Low Pass filter: ON

IMC Servo Board

• Input 1 enable: ON
• Input 1 pol: POS
• Input 2 enable: ON
• Input 2 pol: POS
• Input 2 gain: 16 dB
• Input 1 gain: 9 dB
• Common Compensation: ON
• Boost 1: ON
• Generic filter: ON
• Fast Gain: -6dB
• Fast enable: ON
• Fast Pol: POS
• Bypass: ON

CM Servo Board

• Input 1 enable: ON
• Input 1 polarity: POS
• Fast polarity: POS
• Slow polarity: NEG
• Bypass: OFF
• Input 1 gain: 9dB
• Fast gain: 6dB

LSC:REFL_SERVO_SLOW Filter

• FM1 ON (antiwhitening gain)
• Gain: -1

LSC-CARM Filter

• FM8 (z6:p1k), FM1(z5:p20), FM4, FM5 ON
• Gain: 80

MC2_M3_ISCINF Filter

• FM6, FM7 (notches) ON
• Gain 1

MC2_M3_LOCK_L Filter

• FM9 (chebychev at 300Hz) ON
• Gain: -300

MC2_M2_LOCK_L Filter

• FM3, FM4, FM10 ON
• Gain: 0.01

1. CM Slow Path TF mag/phase: SCRN0119.txt/SCRN0120.txt
2. CM Fast Path TF mag/phase: SCRN0123.txt/SCRN0124.txt
3. CM Common Path open loop TF mag/phase: SCRN0121.txt/SCRN0122.txt

PLL Servo Board Settings

• Input 1 pol: NEG
• Input 1 gain: 0dB
• Input 1 enable: ON
• Common Comp: ON
• Generic Filter: ON
• Fast Option: ON
• Fast gain: -8dB
• Fast pol: NEG

PDG Servo Board Settings

• Input 1 pol: NEG
• Input 1 gain: -1dB
• Common Comp: ON
• Boost 1: ON
• Fast Pol: NEG
• Fast gain: 0dB

1. PDH Error signal amplitude spectrum: EX_PDH_NoiseSpectrum.txt
2. PDH "shot" noise: EX_PDH_ShotNoiseSpectrum.txt
3. PDH open loop TF: EX_PDH_TFOpenLoop_mag/phase.txt

Doug, Rick, Craig
Friday we finished the P-Cal periscope installation and alignment
Final results after periscope lock down with the steering mirrors added:

Pitch: -6.0 micro radians (desired +/- 200 micro radians)
Yaw: 22 micro radians (desired +/- 200 micro radians)

Longitudinal: EDM reading 1,575 mm (desired 1,574.56 mm) L= 5,629.8 mm (HR to monument) - 4055.237 mm Periscope to HR face)= 1,574.56 tolerance +/- 3.0 mm

Latitude: within the 0.5mm width of the vertical target cross hair. (tolerance +/- 2.0 mm)
Vertical: within the 0.5mm width of the horizontal target cross hair. (tolerance +/- 2.0 mm)
Roll: within the 0.5mm width of the vertical horizontal target cross hair. (tolerance +/- 2.0 mm)

All measurement made in relationship to the beam line perpendicular to the HR face (00. 02'.12" pitched down (639 micro rads. total station pointing up -89deg 57'48"

P-cal doc E1300477; IAS alignment doc E1200953 ( both are being update to the as built versions with corrects)

 
Laser Enclosure in Science mode
Laser Enclosure shows no environmental alarms

Laser Status:
SysStat is good
Frontend power is 29.1 W 
FRONTEND WATCH is Active
HPO WATCH is red (PSL operating in low power mode)

PMC:
Last lock loss 4d 12h
Ptrans 11.0W, Prefl 1.1W


FSS:
Last lock loss 0d 0h 14m
Threshold on transmitted photo-detector PD = 0.488V

ISS:
The diffracted power is around 5.6% 
Last saturation event was 0 h and 19 minutes ago 

The I/O chassis attached to h1susauxh56 failed Feb. 8, 19:35:30 PST, causing the h1susauxh56 model to stop running (along with the IOP model).  Power cycling the I/O chassis is ineffective at getting it to run again, so it will need repair.

Sheila. Alexa.

When we got here this morning the ETM ISI was tripped.  We decided to use the chance to roughly aling the cavity (using the SUS offsets) with it tripped, and reset the CPS targets.  Hopefully this will reduce the ringing up of trilliums when we isolate by reducing the amount that the ISI has to move. We only did this for stage 1, since stage 2 was already pretty cose to the target values.  Before and after screen shots of what we started with is attached.  The ! Store target offsets button didn't seem to do anything, so I copied the numbers by hand. 

After this I tried to follow hugh's alog 9926

first I set all the blends to 750mHz, then tried to isolate stg1 level3.  However, when I tried to move the blends to tcrappy it kept tripping, so now I have it at level 2 and tcrappy doesn't trip it.  On stage 2, I tried level 2 (starting with 750 blends) moving to tcrappy would cause it to trip.  Stage 2 level 2 tripped, 1 when I tried to change from 750 to Tcrappy, then even when I left it at 750.  Now it is at level 1 with 750 blends.

Modified black glass holders worked only for some Siskiyou mounts, not all.

Some screw heads are sticking out more than the others. I could have forced it really hard and probably it would have fit, but I didn't want to risk changing the alignment. Another round of clean milling job was done, parts will go to air bake again on Monday.

TMS was balanced nicely at the level good for IAS.

We put everything except the black glass holders on the table (we put black glasses themselves directly on the table at their approximate positions).

Added two 200 grams masses to compensate for the fact that we removed Hartman reference path mirrors and mounts (480 grams together). Combined with 8 pieces of black grasses, this should be close enough.

We changed the cable bracket position to prevent cable interference.

After these, we balanced both the top mass and the table by using slide masses.

No signal from TMS BOSEMs.

BOSEM cables were connected but I don't see anything in the digital world.

Ideally, we'd like IAS to work while TMS is damped.

Stefan, Lisa

It is still not great, but we could stay locked on 3f for more than half an hour. We intentionally unlocked by letting Sheila aligning the arm.
The sideband power dropped significantly during the lock, by about 30% (neither dither nor alignment loops running yet).

Kiwamu, Lisa, Stefan

We increased the 9MHz modulation depth by 3dB. This was done by increasing the IFR drive from 10dBm to +13dBm, and putting 3dB attenuators in all path except the one for the 9MHz EOM. This should raise the 9MHz modulation index from 0.1 (alog 9395) to 0.14. We expect a 9dB stronger signal for the 27MHz.

Indeed with this setting we were able to get a pretty stable lock on the 3f signal (its locked as I type this.)

Some of the settings changes were:
- PRCL gain -0.4
- MICH gain 40
- BS M2 LOCK L: added the comb60 (FM4) and ELP90 (FM9) in addition to the f^2 (FM6) and z30:p100 (FM7)
- We didn't need any additional filters for PRM M2 LOCK L (We only have FM3 FM4 FM8 and FM10).
- We notices the occasional saturation in the REFL27 input, so we lowered the whitening gain to 21dB (val=7), and increased the digital gains from 3 to 4.243. Whitening stages 1 and 2 are also on.

- We also noticed that it prefers slightly hight MICH and PRCL gain for acquisition (we used -0.6 and 60)
- Also, we noticed that the REFLAIR45 (which currently has 0dB whitening gain and only whitening stage 2) tends to saturate during lock acquisition. It seemed to lock quicker without any whitening filters on.

- Even though CDS doesn't report any saturations, we occasionally see the BS optical levers get kicked and ring down. (The BS has optical lever damping.)

The attached plot shows the raw signals of REFLAIR 45 and REFLAIR 27, as well as the drive to the BS M2. (The signals are scaled to gain-match.)

PS: it is still locked on 3f - 16min and counting.

Evan, Lisa, Kiwamu,Stefan

Tonight we fixed our PRC oscillation problem: it was due to a demod phase that was 11deg off. Combines with the fact that MICH is only acting on the BS, this messed up our loop shape. We carefully phased REFL_45 to 144.6deg, and lowered the MICH gain to 50 and PRCL GAIN TO -0.6. (All these gains are in guardian now.)

Next we went on to 3f locking. We phased the 27MHz by simply maximizing the signal in I (we needed 90deg). Switching PRCL to 27_I was straight forward.

For MICH we wanted to user the 135MHz signals, but the signal seemed dead. Thus we tired 27_I. The transition worked fine, but we are still saturating the BS around 30-40Hz, and typically loose lock after 20sec or so.

As a result Lisa was disappointed: despite cooking dinner for us, be didn't quite achieve a stable lock on 3f tonight. But we promised her that we'll increase the modulation depth and the light of the 3f diode.

Evan, Stefan, Kiwamu, Lisa

There has been some confusion about factors of two in previous entries, so here are our "final" numbers:

- Pin = 8.8 W entering the IMC, measured on the PSL table
- with PRM aligned, R = 98.6%
-  from Paul's calibration  of the MC2Trans diode (we measured 645 uW), it looks like there is T = 88% from the PSL to the transmission of the input mode cleaner;
- given the HAM1 path, we expect 1.25% of the REFL power to reach the LSC RF diode P_exp = 8.8 * 0.986 * 0.88 * 1.25e-2 = 95 mW;


 LSC in vac REFL A (LSC RF PD)  (1.25% of REFL power) = 15900 counts (maximum found by moving RM2)

==> 15900 [counts] * (1/1638) [V/counts] * 2 [diff to single input] * (1/200) [1/Ohm] * 0.8 [W/A] =  78 mW 

 LSC REFL AIR A (LSC RF PD)  (0.625% of REFL power) = 7955 counts 

==> 32.5 mW measured directly in front of the diode on table

==> 7955 [counts] * (1/1638) [V/counts] * 2 [diff to single input] * (1/200) [1/Ohm] * 0.8 [W/A] = 39 mW

 LSC REFL AIR B (BBPD)  (0.625% of REFL power) = 21770 counts 

==> 34 mW measured directly in front of the diode on table


==>  Conclusion : The discrepancy between what we see and what we expect is not a factor of 2, but more like 20%-30%, and in vac and in air diodes gives us consistent numbers. 

The MC2 roll mode notch (FM6 in ISCINF) was left off overnight, resulting in a rung up 28Hz peak in MC_L, which was producing a huge signal in PRCL. Once on the peak slowly disapeard.

PRMI locking is now quite reliable. However we still have relatively big power fluctuations.

I recorded today's settings in a setup script: sballmer/tempfixes/setPRMI
Really, this should be fed to a guardian.