Yesterday Rick and I fixed swapped out a broken fitting on the diode chiller line to fix a water leak. PSL was brought back up after this, but ILS would not lock. Reference value for the PZT was changed from -1.65 to -1.40. The laser locked immediately, and has been running since then.
Fabrice, Hugo,
A GS13 huddle test was performed in order to pursue the investigation of the gain difference observed on the TFs measured on HAM-ISI Unit#2 (alog #2308)
Three horizontal GS13s were tested on the “bench”
Initially installed on this unit. Gain is half too small. One of its two op-amp could be malfunctioning.
Response lower by a factor of 100 to 10000 below 20Hz. The seismic mass can be felt/heard when tilting the instrument, hence it is not stuck. The instrument will be opened at LHO for inspection. It will have to go back to LLO to pass the leak-checking-test before being installed on a Unit.
Locked test-mass got unlocked after manipulation. Acceptable power-spectrum. Not vacuum-compatible.
Conclusion:
Production GS13s are malfunctioning. The Test GS13 Pod #66 will be used temporarily for this testing phase of HAM-ISI Unit #2 testing. It will be removed before storage of the unit. Later on, a production GS13 will be installed for the side-chamber testing.
Test-GS13 Pod #66 was installed on HAM-ISI Unit #2, as H3. GS13 doors were closed. Phase 1 of HAM-ISI Unit #2 testing is in progress. Transfer functions are being recorded overnight.
Attached are plots of dust counts > .5 microns.
Gerbig has finished the framing for both rooms, though some panels are still missing. Light fixtures for the laser room were put up. Electrical work is ongoing. HEPAs are slated to arrive Tuesday, acoustic door is still scheduled for early next week.
Yesterday, the first set of transfer functions on ISI-BSC8 was measured in vacuum. Here are the links to a comparison with the previous measurements in air. TFs are presented in Cartesian basis.
https://svn.ligo.caltech.edu/svn/seismic/BSC-ISI/H2/ITMY/Data/Figures/Transfer_Functions/Comparisons/C2C/
- LHO_ISI_BSC8_Comparison_TF_C2C_ST1_ACT_H_to_ST1_CPS_H_20120203_vs_20120227.fig
- LHO_ISI_BSC8_Comparison_TF_C2C_ST1_ACT_H_to_ST1_L4C_H_20120203_vs_20120227.fig
- LHO_ISI_BSC8_Comparison_TF_C2C_ST1_ACT_V_to_ST1_CPS_V_20120203_vs_20120227.fig
- LHO_ISI_BSC8_Comparison_TF_C2C_ST1_ACT_V_to_ST1_L4C_V_20120203_vs_20120227.fig
- LHO_ISI_BSC8_Comparison_TF_C2C_ST2_ACT_H_to_ST2_CPS_H_20120203_vs_20120227.fig
- LHO_ISI_BSC8_Comparison_TF_C2C_ST2_ACT_H_to_ST2_GS13_H_20120203_vs_20120227.fig
- LHO_ISI_BSC8_Comparison_TF_C2C_ST2_ACT_V_to_ST2_CPS_V_20120203_vs_20120227.fig
- LHO_ISI_BSC8_Comparison_TF_C2C_ST2_ACT_V_to_ST2_GS13_V_20120203_vs_20120227.fig
Main differences on main couplings:
- ST1 ACT to ST1 CPS: HEPI in different state for the two measurements (Locked vs Unlocked) => Resonances between 7 and 60Hz
- ST1 ACT to ST1 L4C: No difference between the 2 measurements
- ST2 ACT to ST2 CPS: No difference between the 2 measurements
- ST2 ACT to ST2 GS13: Some Qs at high frequencies slightly higher in vacuum than in air (resolution may need to be changed at HF)
Tonight, the section 700mHz to 10Hz will be re measured with a better resolution. The goal is to get a nice measurement in order to calculate all the filters (Symmetrization, blend, damping and isolation) using one unique set of measurements.
Due to high wind speeds, the South Bay roll-up door was closed to mitigate the elevated dust levels in the LVEA. Normally, this door is kept open to purge air from the LVEA, but the increased wind speeds overcame the over-pressurised LVEA. Dust monitor levels have subsided to normal levels after the close just before noon.
Correction - The South bay man door (emergency egress) is used to purge dust.
ETMY M0 and R0 measurements were run today for just the L DoF with the usual drive and measurement parameters. The drive band was limited to 0.01 to 21Hz with 0.01Hz resolution. There appears to be some rubbing of the flags in these measurements as some added resonances are appearing in the L DoF TFs. Investigations to come.
I have added several control blocks to the 2stage master model. I also added the GUARD block from userapps/isc/common/models/ISC_common.mdl to start working on guardian installation. New controls: Stage 0 (HEPI) --> Stage 1 sensor correction Stage 0 (HEPI) --> Stage 1 feed forward Stage 1 (T240) --> Stage 2 sensor correction Stage 1 (L4C & T240 Blend) --> Stage 2 feed forward Stage 1 --> Stage 2 feed forward compensation The outputs of these controls have been GROUNDED. This is to prevent any additional input while they are not yet operational. Many inputs are also grounded before we determine how to get the HEPI L4C signals to the BSC. The model has built correctly. I will test installing the model tomorrow. Work still to be done: 1. Install stage 1 and stage 2 BLRMS monitors 2. Install medm screens for new controls and blend-switching 3. Revise existing medm screens to be compatible with adjusted macro schemes
More on particulate contamination: I suspected that the flow in the EY cartridge cleanroom area was not working as we planned. John helped us look closer at the flow in the cleanroom "system" we have for the cartridge work. The ETMy/SUS/ISI cartridge is sitting in a large cleanroom (CR), with a smaller CR placed on either side. We determined that the smaller CRs on opposing sides of the main CR are forcing air into the main one. This is because the smaller rooms have lower ceilings (thus lower fans closer to the ETM "action"), a smaller gap between the curtains and the floors, and have a higher number of fans/volume. As well, in the main room the ISI is blocking most of the downward flow from CR fans. We also have been pinning the curtains open between between the small and large CR, increasing the work real estate. One of these now open walls makes a direction flow line-of sight to ETMy-HR. Long story short, we'll need to re-think this next time we do an end station cartridge install. Small things will help, such as purging more flow from the smaller rooms (raising them to add more gap between floor/curtain).
After some conversation, John suggested a couple of fixes: increase the positive pressure in the Test Stand CR relative to the two small CRs and mitigate curtain issues. The most obvious way to change flow is to adjust the FFUs on the CRs to medium but this is difficult at the moment given the restricted access to the FFUs, especially on the Garbing/Staging CR. John suggested replacing the strip curtains on two side (beam tube and roll-up door) of the Test Stand CR will solid panels but this didn't seem a good idea since it would leave both COC and TMS optics exposed during the change out. A reasonable experiment to test the concept seemed to be using CP Stat sheets on the exterior of the strip curtains to maintain more positive pressure in the Test Stand CR. The CP Stat was attached to the CR frame using CR tape. Duplicate curtains were removed from the Staging and Work Space CRs.
Today, we finished installing the sleeve, wedges, and cross braces on the ETMy structure. We then made a cleaning attempt of the ETMy HR which was futile. A gradient of particulate was observed over the entire surface, including the very bottom 1/4 which still had First Contact covering it. There was ~40 particles/sq.in at the top of the optic (where it has been exposed on and off for many weeks. There were ~10 particles/sq.in on the lower half of the optic. ~5-10 particles/sq.in on the lowest 1/4, observed while pulling the remaining bit of FC today. We N2 blew and swab dabbed, but to no avail. We then repainted a fresh sheet and repeated the whole process on the ERM-AR. Similar results on that surface. We left the suspension fully suspended, but with the face shields in place. Fabrice reported that they were going to finish balancing the ISI table and then would remove the face shields for TFs tonight/tomorrow.
Attached are plots of dust counts > .5 microns.
Anteroom frame went up today. The wall against the laser room has not been set up yet, as they need dimensions from the acoustic door first.
Acoustic door shipped today, and is scheduled to arrive early next week (did I say it was going to arrive today? Oops).
I have created a new 2-stage master model for RCG release 2.4. This model will use C-code and scripts for blend-filter switching that requires the cdsFiltCtrl block in version 2.4. I have replaced the isi2stagemaster block in h2isiitmy.mdl with the isi2stagemaster_2_4 block. The new model is called isi2stagemaster_2_4.mdl in userapps/release/isi/common/models. I built it on h2seib8 in /opt/rtcds/lho/h2/rtbuild-2.4.1. It built successfully, and I'm waiting to test The prepare script will need to be changed to load the blend filters into both the 'CUR' and 'NXT' banks, rather than just the individual banks (this doubles the number of blend filters that must appear in the foton file). It also requires the 'MASTER' switch blend filter script, rather than the regular switch blend filter script. I will move this script from the Stanford directory to the common scripts directory. I will add the screens for the new blend filters from the Stanford screens, as well as the new overview screen. It seems as though there's a 'trunk' building area that uses the current trunk of the RCG. This might be useful for testing the new Guardian alarms.
Per Fabrice's suggestion, I have changed the naming for the models. The new (2.4, current) model is still named isi2stagemaster.mdl. The old (2.3) model is now named isi2stagemaster_2_3_STATIC.mdl.
Transfer functions were measured on HAM-ISI unit #2. Results are close between measurements performed with CPSs of the same direction (H,V). (Page1)
However, TFs are not close enough between measurements performed with GS13s of the same direction: (page 2)
Powerspectra were recorded on GS13s. H3 appears lower that H1 and H2 (page 3). The same measurement was performed with GS13-H2 connected on H3 interface-chassis, and vice versa (page 4). The gain difference follows the GS13s. It confirms that the gain difference observed between the GS13s does not come from the interfaces.
Corey, Hugo,
25 pins octopus-in-vacuum connectors were switched between corners 1 an 3. The ½ gain observed on corner 3 was then observed on corner 1 channel. This gain could then come from whether a bad connection of the 9pin GS13 connector or from the GS13 itself (preamp).
GS13-H3 was pulled out for inspection. Its 9 pin connector was correctly connected. We checked the 9pins connector itself hoping to find a broken female pin. Nothing abnormal was noticed. We tried taking a power-spectrum measurement with another 9pin connector. We could still see a gain of ½ on the instrument’s power-spectrum.
The GS13 was set on the “bench” for a huddle test.
Shut-down YBM MTP and QDP80 to allow turbo header modifications, also valved-out purge air from LVEA to allow purge header modifications
Attached are plots of dust counts > .5 microns. I have attached a plot of H0:PEM_LVEA_DST11_MODE to show when the cable was reconnected.
After several hardware hunting excursions, the ETMy sleeve is mostly installed. With the TMS crew eager to begin their work, and one more excursion remaining, I left the TMS crew to do what they had to do. Since their work involved using the Genie (which I had not known about prior), I decided to postpone installing the vibration absorbers as well, since they are yet another access limiter/head knocker and they are very quick to install. NOTE FOR THE TESTERS: the ETM is still locked and probably will remain so until after SEI has finished balancing and floating.
Note - this a log means that we are NOT finished adding payload.
