HAM3 - PR2 & MC2 (HSTS) M1-M1 Phase 3a TFs are clear (again)

[Stuart A, Arnaud P]

After the door was briefly removed from HAM3 to recover first contact from a witness optic (see LHO aLOG entry 12994) we repeated TFs again on PR2 & MC2 (HSTS) suspensions to verify that no issues had since developed, as follows:-

- PR2 M1-M1 undamped (2014-07-28_1090637500_H1SUSPR2_M1_damp_OFF_ALL_TFs.pdf) 
- MC2 M1-M1 undamped (2014-07-28_1090619695_H1SUSMC2_M1_damp_OFF_ALL_TFs.pdf)

HAM3 ISI Status: ISI damped, no isolation loops running.

PR2 & MC2 alignment: No offset was applied during this measurement.

The undamped measurements from above have been compared with each other as well as the model (allhstss_2014-07-29_Phase3a_H1HSTSs_M1_Doff_ALL_ZOOMED_TFs.pdf).

Summary: 

Both PR2 & MC2 M1-M1 TFs show good agreement with the model and perform consistently, thus raising no concerns.

All data, scripts and plots have been committed to the sus svn as of this entry.

CDS model and DAQ restart report, Monday 28th July 2014

no restarts reported

HAM2 - PR3 (HLTS) all stage Phase 3a Power Spectra are clear

A clean set of TFs were previously taken for all stages (M1, M2 & M3) of PR3 (HLTS) suspensions (see LHO aLOG entries 13017 & 13021), to complete Phase 3a power spectra have been taken with damping loops both ON and OFF for all stages. These power spectra measurements have been compared (allhltss_2014-07-28_Phase3a_H1HLTSs_ALL_Spectra_D*.pdf). The plot key is as follows:-

Black Dashed Line = Expected Sensor Noise
Blue Solid Line = H1SUSSR3 2014−07−24_1030
Green Solid Line = H1SUSPR3 2013−10−07_0800

Summary:

Noise floors for PR3 M1 & M2 stages are consistent with expectations. However, it should be noted that M3 channels exhibit some small excess noise features above 10 Hz, which is most likely due to purge air flow.

All data, scripts and plots have been committed to the sus svn as of this entry.

HAM3 MC2 PR2 lower stages tfs results

Lower stages transfer functions of HAM3 suspensions (MC2 - PR2) succesfully completed over the week end and were processed today. They match very well model and previous measurements. One interesting feature is worth noticing though : the M3-M3 tfs of PR2 (Long Pitch and Yaw) (see 4th attachment) shows a high Q resonance at 45Hz, which is certainly not mechanical, but might be related to the 'turn-up' seen with other osems.
A quick dtt tf was taken, driving the L channel, confirming the presence of the feature. It also shows up with coil driver in state 1 and state 2. The attached dtt screenshot shows that the feature comes from the LR channel. More investigation will be done tomorrow.

The tfs results are presented in the attachments as follow :

1. H1 MC2 M2-M2 undamped tfs compared with model
2. H1 MC2 M3-M3 undamped tfs compared with model
3. H1 PR2 M2-M2 undamped tfs compared with model
4. H1 PR2 M3-M3 undamped tfs compared with model
5. H1 PR2 / MC2 M2-M2 tfs compared with previous in chamber, in vacuum measurements
6. H1 PR2 / MC2 M3-M3 tfs compared with previous in chamber, in vacuum measurements

Data and scripts were commited to the svn

ETMx closeout work started

Danny S, Gary T, Matt H

We began the closeout of the X-end station today. The Quad was locked down and the baffle swung back and kept in place using the wedge. Using the green light the number of particulates on the HR surface was estimated to be in the teens per square inch. We noticed that there was already a 1" monitor optic and a 4" wafer in place. We dont know if these should of been removed straight after the vent, or have been placed there to monitor activity during the vent. But we have left them be for now

Gerado also asked us to inspect the 4 viewports in that chamber if we could whilst inside the chamber. There is a potential issue with the middle viewport on the eastern door (looks like imprint of peek mesh I am told)...but Danny believes its on the outside, so should look at it more indepth. The others look fine

A new wipe was put on the cone and the cone put on the HR surface of the Quad. With the cone butted up against the optic there was plenty of room to fit between the cone and the baffle. Danny when he sprayed used the "shroud" technique that we use at LLO to stop any potential backspray of FC (you can see it in one of the pics). He reported not seeing any of the spiderwebbing effects we saw in the corner station FCing. The FC mixture for spraying was the standard 1:1.

After allowing FC to dry an outer crust was painted on the HR surface of the Test mass optic. Calum informed me that we could paint the ERM surface and so we put 2 layers (and outer crust) on the ERM surface also. Peek tabs painted onto both optics

 

Next up...a good deep clean of the chamber

 

Pics are of Gary and Danny during various steps of FC process (I was outside support today :-))

HAM2 - MC1, MC3 & PRM (HSTS) all stage Phase 3a Power Spectra are clear

A clean set of TFs were previously taken for all stages (M1, M2 & M3) of MC1, MC3 & PRM (HSTS) suspensions (see LHO aLOG entries 12974 & 13019), to complete Phase 3a power spectra have been taken with damping loops both ON and OFF for all stages. These power spectra measurements have also been directly compared (allhstss_2014-07_28_Phase3a_H1HSTSs_ALL_Spectra_D*.pdf). The plot key is as follows:-

Black Dashed Line = Expected Sensor Noise
Blue Solid Line = H1SUSMC1 2014−07−28_1200
Green Solid Line = H1SUSMC3 2014−07−28_1300
Red Solid Line =H1SUSPRM 2014−07−28_1400

Summary:

Noise floors for MC1, MC3 & PRM are consistent with expectations. However, it should be noted that both MC3 & PRM M1 LF & RT channels exhibit excess noise around 10 Hz, which is most likely due to purge air flow.

All data, scripts and plots have been committed to the sus svn as of this entry.

ITMY Arm Cavity Baffle photodiodes

Tested the forward voltage for the ACB photo diodes. 
BSC1 Flange F1-3C1 (air side).

Pin 1&2
PD forward voltage: 0.412V

Pin 4&5
PD forward voltage: 0.428V

Pin 7&8
PD forward voltage: 0.422V

Pin 10&11
PD forward voltage: 0.428V

All results within spec.

Filiberto Clara

itmy tfs running overnight on opsws1

~1500 hrs. local -> Stopped baking RGA mounted at port X1-9 in the X-mid

Ops Summary

LVEA laser safe

08:55  Aaron – Going to End-X and to End-Y to check noise eater switch
09:01 Mitch – In LVEA working on ACB installation
09:13 Matt, Danny, & Gary – In LVEA gathering up tools for End-X close out
09:15 Manny – In LVEA to survey kill switches
09:33 Doug & Jason – ACB alignment Y-Arm 
09:34 Nathan – Laser work in Optics lab
09:40 Apollo – Pulling North door on HAM6 to pull leak check bung
10:08 Mike – Taking tour into LVEA
10:15 Andres – In the LVEA cleaning area working on contamination control assembly
10:30 Gerardo & Joe - Going to End-X for viewport survey
10:39 Matt, Danny, & Gary – Going to End-X to prep for chamber close out
11:18 Notified Kyle of alarm on IP-05
12:36 Test of Hanford emergency alert system
13:00 Filiberto & Manny – End-Y to pull PEM cables
13:10 Mitch & Travis – In LVEA for Y-Arm ACB installation work
13:31 Justin – End-X and End-Y for laser survey
13:37 Betsy – Working in Beer Garden to prep for BSC closeout
13:50 Gerardo – In LVEA west bay working on ionization experiment 
13:52 Paul & Jordan – Going to End-Y to take PEM measurements
14:34 Matt, Danny, & Gary – At End-X preparing for chamber close
15:50 Filiberto - Checking ACB photo diode 

HAM2 - MC1, MC3 & PRM (HSTS) M2-M2 & M3-M3 (lower stage) Phase 3a TFs are clear

After obtaining clear M1-M1 (top-top) TFs for HAM2 suspensions over the weekend (see LHO aLOG entry 12974), I've now processed data for lower stages as follows:-  

- MC1 M2-M2 undamped (2014-07-27_1090556791_H1SUSMC1_M2_damp_OFF_ALL_TFs.pdf)
- MC3 M2-M2 undamped (2014-07-26_1090419127_H1SUSMC3_M2_damp_OFF_ALL_TFs.pdf)
- PRM M2-M2 undamped (2014-07-26_1090421241_H1SUSPRM_M2_damp_OFF_ALL_TFs.pdf)

- MC1 M3-M3 undamped (2014-07-27_1090565498_H1SUSMC1_M3_damp_OFF_ALL_TFs.pdf)
- MC3 M3-M3 undamped (2014-07-26_1090427890_H1SUSMC3_M3_damp_OFF_ALL_TFs.pdf)
- PRM M3-M3 undamped (2014-07-28_1090609009_H1SUSPRM_M3_damp_OFF_ALL_TFs.pdf)

HAM2 ISI Status: ISI unlocked, ST1 damped, no isolation loops running.

MC1, MC3 & PRM alignment: No offset was applied during this measurement.

The undamped measurements from above, for each stage, have been compared with each other and the model (allhstss_2014-07-28_Phase3a_H1HSTSs_M2_Doff_ALL_ZOOMED_TFs.pdf and allhstss_2014-07-28_Phase3a_H1HSTSs_M3_Doff_ALL_ZOOMED_TFs.pdf).

Summary: 

M2-M2 TFs, show good agreement with the model and are consistent between H1 HSTS suspensions. However, the P DOF exhibits a feature at ~2 Hz present for both MC3 and to a much larger extent PRM. I suspected this to be an artifact of the measurement, therefore, I manually repeated the P DOF TF in DTT, which verified there were no issues with the suspension (see PRM_M2_P_DOF.png below).

M3-M3 TFs, again, these show good agreement with the model and are consistent between H1 HSTS suspensions, thus alleviating any concerns of rubbing.

All data, scripts and plots have been committed to the sus svn as of this entry.

IP5 controller failed -> will replace

HAM3 SUS (MC2 PR2) top stage tfs running overnight on opsws1

ISI is damped

PSL Status

PSL Status: 
SysStat: Green 
Output power: 36.2w  
Frontend Watch: Good
HPO Watch: Red  

PMC:
Locked: 4 days, 4 hours
Reflected power:    4.3w
Power Transmitted: 21.4w 
Total Power:       25.7w 

FSS:
Locked: 4 days, 4 hours
Trans PD: 0.53v

ISS:
Diffracted power: 7.535%
Last saturation event: 3 days

PR3 lower stages results

Transfer functions of the lower stages of PR3 (HAM2) have been measured over the week end, with the sus undamped and the ISI damped.

M2-M2 tfs are showing good agreement with model and previous measurements (except for unexpected resonance at 0.97Hz in the L-L tf)
M3-M3 L-L is ok. P-P has a factor of 4 discrepancy with the model (similar pb as with SR3, which I thought I fixed but apparently not. I resaved a safe.snap with corrected EUL2OSEM matrix). Y-Y shows signs of couplings.

To note : The amplitude of excitation was too large, since the dac saturated for both M2 and M3 measurements (cf screenshot). I modified the drive parameters file "/ligo/svncommon/SusSVN/sus/trunk/Common/MatlabTools/SchroederPhaseTools/TFSettingsLHOHLTS", which should have correct gains from now.

The results are presented in the attachments :

1. H1 PR3 M2-M2 undamped tfs (green) compared with the model (blue)
2. H1 PR3 M2-M2 undamped tfs (pink) compared with undamped tf (in vacuum) from July last year (orange)
3. H1 PR3 M3-M3 undamped tfs (green) compared with model (blue)
4. H1 PR3 M3-M3 undamped tfs (pink) compared with H1 SR3 (cyan) (in chamber, in air, ISI locked) and L1 SR3 (in chamber, under vacuum, ISI isolated)

Data, scripts and safe.snap were commited under the svn

HAM2 PR3 (HLTS) tfs complete and clear

PR3 M1-M1 transfer functions ran over the week end after HAM2 closeout last friday are showing good agreement with the model and previous in vacuum measurements.

The results are presented in the attached pdf :

1. H1 PR3 in (closed) chamber, in air, ISI damped, M1-M1 undamped TFs (green) compared with the model (blue).
2. H1 PR3 in (closed) chamber, in air, ISI damped, M1-M1 undamped TFs (black) compared with in vacuum measurements from sept 2013 with ISI isolated (orange curve). 

CAL added to SITEMAP mddm

I have added CAL buttons to the sitemap. PCALX is attached to the EX button, EY and CS are placeholders.

HAM2 - MC1, MC3 & PRM (HSTS) M1-M1 (top stage) Phase 3a TFs are clear

After securing doors on HAM2 (see LHO aLOG entry 12995), TFs have been taken over the weekend as part of Phase 3a testing to check for rubbing or other issues that may have developed as follows:-  

- MC1 M1-M1 undamped (2014-07-27_1090539018_H1SUSMC1_M1_damp_OFF_ALL_TFs.pdf)
- MC3 M1-M1 undamped (2014-07-26_1090401593_H1SUSMC3_M1_damp_OFF_ALL_TFs.pdf)
- PRM M1-M1 undamped (2014-07-26_1090403653_H1SUSPRM_M1_damp_OFF_ALL_TFs.pdf)

HAM2 ISI Status: ISI unlocked, ST1 damped, no isolation loops running.

MC1, MC3 & PRM alignment: No offset was applied during this measurement.

The undamped measurements from above have been compared with each other and the model (allhstss_2014-07-28_Phase3a_H1HSTSs_M1_Doff_ALL_ZOOMED_TFs.pdf).

Summary: 

MC1, MC3 & PRM show good agreement with the model and perform consistently, thus raising no concerns of rubbing.

Now need to check lower stage TFs and take power spectra.

All data, scripts and plots have been committed to the sus svn as of this entry.

Standing of chambers at this stage

Kate G, Calum T, Rich A, Matt H

First of all a BIG/MASSIVE/ENORMOUS thankyou to Calum, Kate and Rich for putting up with a slave driver like me and working a 12 hour shift with me on a saturday

 

Standing of chambers at the moment as I remember it:

HAM2

PRM..locked…however still need to lock optic barrel stops and remove front optic EQ stops..then ready for FC

PRM baffle…removed

PR3..locked. Ready for FC

MC3..locked…however still need to lock optic barrel stops and remove front optic EQ stops..then ready for FC

MC1..partially locked

Kapton washers not installed on picomotors yet

ISI…locked

 

HAM3

MC2…FC applied and unlocked

PR2….FC applied and unlocked

Large Kapton washers installed on all picomotors

ISI…unlocked

Covers pulled back from ISI

Coarse wipe down of chamber has occurred

 

BSC2

Beamsplitter optic…locked

ISI…locked

First contact applied to optic...still need to paint "crust"

New baffle installed

Old baffle needs to be reinstalled after FC pulled

Chamber wipe down occurred

 

HAM4

SR2..locked…however still need to lock optic barrel stops and remove front optic EQ stops..then ready for FC

TCS optic in front of SR2 optic removed

ISI…locked

 

 

HAM5

Faraday..unlocked

ISI…locked

SRM…locked…no FC will be applied

SR3…locked. Spray FC applied, need to paint edges

SR3 front baffle removed

Chamber wipe down occurred

 

BSC3

Suspension..locked

FC applied to optic…..still needs outer crust applied I believe

Arm cavity baffle still pulled back I believe.

 

Particle counts

HAM4

In cleanroom start of arvo session

All counts zero

 

In chamber start of arvo session

0.3um...210 counts

0.5um...80 counts

0.7um...30 counts

1.0um...30 counts

2.0um ...10 counts

5.0 um....0 counts

Probably high due to baffle work

Pics attached if people interested in RH/temp

 

Focus of tomorrow is to try to finish HAM4 and HAM5, maybe finish BSC3 and BSC2 first contacting, and do some more work in HAM2. See how we go