I measured magnetic fields from the new PSL chillers because pulsed heater circuits are often used in chillers and can produce large magnetic fields. The temperature is controlled by varying the duty cycle of an on-off square wave with a period of a couple of Hz, which may result in side band combs around the 60Hz peak in DARM. It turns out that there are two magnetic field frequencies associated with the new PSL chiller, 1.1 Hz and 1.4 Hz, which is expected because there are two chilled water circuits. The magnetic fields are comparable for each circuit. The lower plot in the figure shows a magnetometer spectrum when the 1.1 Hz field dominated, with a large peak at 1.1 Hz, and a 1.1 Hz comb around 60 Hz. The upper plot was made at a more distant location when the 1.4 Hz circuit dominated; 1.4 Hz side bands are just barely visible. In the ½ hour I monitored, the fields did not exceed about 1/10^th of the size of the fields from the Neslab chiller that we had problems with in S5 (for the far location, where the side bands are at 5e-12 T/sqrt(Hz), the Neslab peaks would have been about 1e-10T/sqrt(Hz), and for the close location, they would have been about 5e-8T/sqrt(Hz) where the PSL chiller was at about 5e-9T/sqrt(Hz).

I expect that the magnetic fields produced by the PSL chiller to be less than a few times background at HAM6 (large tip tilt magnets) so it is probably OK, but, just in case, we should keep our eyes open for 1.1 and 1.4 Hz sidebands. 

(corey, eric, hugh)

HAMISI#5

Took some photos of the recently-received Horizontal GS13s.  These were placed on the #5 Optics Table, and Hugo ran some quick transfer functions to check their acceptance (heard they are good).  Attached two photos of the set up.

It was decided that the bad Horiz GS13s installed on #5 will be pulled and swapped with (3) Horiz we just received.  The three we pulled are== Horiz GS13s:  20, 37, 84.  They are bagged & tagged and ready to be sent to LLO.

REMEMBER:  we need to get Horiz Actuator & V1-GS13 serial numbers.  Also need to install Particle Fences (if possible).

HAMISI#6

Finished up some minor tasks on this guy (Pull Downs removed, Mid Flexure Doors installed, Particle Fences installed).

J. Garcia, J. Kissel

After seeing the recent good results from H2 SUS ITMY (further log comparing with previous measurements pending from Garcia, upon which we can "approve" the SUS for close out assuming no other mechanical changes), I asked the question: where did we leave off H2 SUS FMY? After not finding any recent aLOGs, but recalling that measurements were taken, I scoured the SusSVN and found two unprocessed data sets taken on 2012-05-01 and 2012-05-02. The results comparing these data with previous data show (assuming that no other changes have been made to it since those dates) that H2 SUS FMY is still rubbing.

The 2012-05-01 data set looks identical to the 2012-03-14, post-fiber break initial check out measurement, which shows the rubbing, and the 2012-05-02 data set appears to have suffered from some sort of data corruption and or watchdog trip.

Retested Cable ISC-BSC6-1. Issue still exists on pins 19 and 18. All other sets on this cable show a forward voltage drop around 0.429V for the diodes. Below is a list of the pins I tested that passed.
Pin 19 and 17
Pin 19 and 5
Pin 19 and 4
Pin 16 and 15
Pin 16 and 14
Pin 16 and 2
Pin 16 and 1

H2 SUS ITMY M0 & R0 transfer functions for the night of 05/10/2012.  Initial analysis of the results look very promising for a BSC 8 chamber close-out.  Final decision for a door-close on BSC 8 from the SUS team to follow. 

Progress on the VBO A leak test retrofit has been going well. I made a bit of an oversight and had to replace the HPS 903 vacuum gauge with an HPS 431 vacuum gauge to go with the existing controller. The SRS RGA software continues to be a pain, I updated it to version 3.2. The update from 3.0 to 3.2 required updating to .NET 2 which required .NET 1 which required updating to Windows 2000 SP5 (unofficial) which required an update to Windows 2000 SP4 (official), I feel like the old lady who swallowed a fly. The SRS software is still a pain though.

Tested out the cold trap, one can see on the attached graphs (first one is after 15 minutes, second is after 150 minutes) the water vapor load is fairly heavy and will most likely only improve with a bakeout. Most likely there are "wet" parts upstream of the cold trap. After 6 hours of pump-down the system was holding steady at 7.2e-8 torr. A quick leak check found no grievous leaks, although a more thorough check wouldn't hurt before wrapping it up with heat tape. 

The LN2 cold trap won't be cold enough to significantly pump down on Argon so I should also work on fashioning a bag to sit over the Viton seal (since air and more importantly Argon seems to permeate at a slow rate) and create a Nitrogen shield. 

We had a timing glitch at EY yesterday afternoon. All front ends except for SUS were restarted yesterday (SUS was in use by in-chamber staff), I have just restarted the SUS front end to complete the set.

Thurs afternoon h2nds0 crashed, the console was frozen at a dmesg display. I had to reset the computer to recover. We don't know the reason for this crash.

HWS pick-off beam was aligned and is OK, nothing is clipping and the beam is going in to the ALS table.

The beam position on the bottom periscope mirror on the telescope is not that bad (lower than ideal but nowhere near clipping), but that mirror is too close to the ETM side, and as a result the beam is not clearing the TMS ISC table hole at the center.

As such, the periscope beam path is a bit tilted, is off-centered on the bottom mirror, table hole and the top mirror, but nothing is clipping and there still appears to be a large margin (e.g. the beam is about 1 cm or so from the edge of the table hole).

At this point, I'd say we confirmed that our alignment is basically OK, not ideal but quite acceptable.

Next task is to fix the picomotor problem, i.e. screw in the stop nuts on the tip of the picomotors so that they don't jam with the siskiyou mount surface. We'll do this using spare picomotors in the lab first, then swap them out in situ on the TMS table, and rework the alignment.

Measurements on H2 SUS ITMY have begun and will take ~7 hours to complete.  An estimated completion time is 02:00AM PST on 05/11/2012.

Summary: We performed a loop-back test of the PSL channels (DAC-> AIfilter -> LVEA_rack via field cable(purple) -> AA filter -> ADC. All channels are ok in terms of transmission and cross coupling. The first PMC ADC chanel (ADC0) has a factor of 100 higher input noise than all other channels.

Details: A 100 Hz sine wave is generated on one DAC channel and send via the AI filters and the field cables to the LVEA rack. Here it is connected to a different field cable representing and send back via the AA filter module to an ADC. The 100Hz is demodulated in software and its amplitude recovered. This measurement is done for all connected channels to determine the transmission of the connected channels and the cross coupling to the neighboring channels. The resuls are plotted in a matirx (see below).

- Stop Work on ALS laser at EY during the morning due to confusion over access, SOPs, and the ODs of laser glasses. The Stop Work was lifted shortly afterwards.
- Reminder: Stop Work orders and affairs relating to all personnel should be sent to the entire site mailing list (address withheld from aLOG), not just the staff mailing list.
- For watchdogs, the ETMY SUS MEDM is incorrect. If the IOPDACKILL shows that damping is allowed, and the 10-minute bypass is started, it will show the IOPDACKILL tripping. Either one of these signals is incorrect.
- Mid-Columbia Forklift replaced the tires on a forklift.
- Dust counts in the bake oven lab were ~10,000 today for a considerable period of time.
- Integration Meeting convened in the Control Room.
- Hugh removed HAM2 ISI cover for pre-install testing.
- PSL working on video cameras and other controls...Rick is looking for (aspiring) experts in laser power metrology and beam profiling.
- ALS/TMS crew working with laser. They were also working in BSC6.
- At ~3pm, an AC power cord was pulled at EY, cutting power to the timing fanout system at EY. Systems were restored afterwards.
- SUS working inside of BSC8 in the afternoon.
- OSB doors locked at 4:00pm.

(corey, eric, jim, mitch)

HAMISI#6 Work

Optics Table Installation

Table installed with no issues (used [3] symmetrically-placed HAM lifting blocks & 3-leg sling).  The Table hung fairly level and this made it easy to drop it on Stage-1.  Here is some serial number info:

Springs S/Ns 

• Corner 1:  10
• Corner2:  18
• Corner3:  11

Flexure

• Corner1:  19
• Corner2:  6
• Corner3:  30

HAMISI#7 Work

This is our first #7 item to work on in the Staging Building.  This table is sitting on the granite table and waiting for someone to helicoil it.

See the below photos but bottom line: Lid was removed and the ISI is being readied for sensor functional tests.  Please don't enter this cleanroom without full bunny suit attire.

Hi,

Find attached a very first version of the SUS generic scripts procedure.
All my scripts are working right now at LHO. I am looking forward to trying them at LLO.

So far,

Positive points: 

- Everything is generic. The user just needs to run a function in Matlab, providing some informations (IFO, Optics, ...). The results will be display in the command window.
- Everything is very easy to use, even for somebody who is not familiar with Matlab
- Allow to do all the first steps in two hours, and to run a full set of transfer functions during a night. Thus, the testing of a suspension can be done in a day if everything goes well.

Negative points:

- So far, nothing is really saved (except for the transfer functions), but just plotted. 
- All the scripts are in the same folder (SusVN/sus/trunk/Common/Generic_Testing_Scripts/). For now it is a bit of a mess.


I am looking forward to talking with Jeff Kissel to see what we really need to save, and how we can organize the folders.

Cheers,
Sebastien

Inspection of the cleaned chamber, removal of dust barriers, and FTIR sampling were completed this morning. (*Note: Permanent BSC flooring will NOT be installed at this time.) The dome was documented, vacuumed, inspected and FTIR sampled this afternoon. Doors and dome will go back onto the chamber tomorrow.

J. Garcia, J. Kissel, S. Steplewski

Tuesday's measurements showed severe cross coupling on the Main Chain, and only two vertical modes (where there should be three) on the reaction chain. Brett and Mark subsequently modeled that the R0 UIM and R0 PUM were moving as one, and Travis went in and found (a) that the M0 BOSEMs were all wonky, and (2) that the R0 UIM blade stops were locked. 

Since then, Travis has unlocked the R0 UIM blades, and re-aligned the M0 BOSEMs, and Jeff has remeasured all TFs. The results are attached. In summary, M0 (though the measurement was taken with damping loops ON*) looks good**; R0 still has some rubbing (likely at or near the top stage*** -- maybe the UIM blade stop was backed off too far and is contacting TOP to UIM SUS wires?), and its cables appear to be adding stiffness****.

Jeff, Szymon, and Travis are going in to investigate further as I write the aLOG update...  

Details / Further Explanation
-----------------------------
* The M0 TFs were taken with damping loops ON, simply because of a failed automated hand off between HEPI measurements and SUS Measurements. Nominally, we want to set up a system similar to the BSC-ISI and SUS, where there's an EPICs variable reserved for indicating "measurement ON" and "measurement OFF" that automated Matlab TF scripts would turn on and off appropriately. Unfortunately, for the HEPI / QUAD trade off that Vincent / Garcia tried last night, either the variable wasn't there yet, HEPI's automated scripts were set up to turn the EPICs variable or the SUS damping loops on/off, the QUAD script wasn't watching it to take the appropriate action, or something (I couldn't quite tell what happened from Garcia's description) because things were set up a little bit too quickly. So, the damping loops for the QUAD (required during the HEPI TF) were left ON after the HEPI TF had finished during the M0 TFs, but were turned OFF by the automated script by the time R0 TFs rolled around. No big deal, there's a first time for everything with these automated scripts, and it never works out the first time. Garcia's gunna make sure that either he gets the chamber for the evening, or the automation works better this time.

** Looking at pages 1 through 6 of the attachment comparing current to previous should-be-the-same measurements, you can see 
- If you by-eye undamp the transfer functions, you can see that "everything seems to be in the right place" compared with the previous measurements
- The cross coupling that was in the 2012-05-07 measurement looks to be gone
- We're inconsistently damping each degree of freedom; some way overdamped (P), and some poorly damped (e.g. L)
So, we say we think the dynamics look good from this eyeballing, but we know that damping signifcantly reduced cross-coupling, so we really need an undamped measurement to really confirm the dynamics are OK.

*** Pgs 7 to 12 show the reaction chain. As far as "rubbing at the top stage" I see that the data for low frequency modes of R, T, and V are low Q and noisy which we've found from experience usually means rubbing. Because the rubbing appears to be affecting only the low frequency modes, we know that the rubbing should be localized to the upper stages. (Remember: for low frequency modes, the QUAD masses are swinging as one, so the "pivot" for these mode will be high up in the suspension; for high frequency modes, the dynamics are more complicated, involving differential motion between the masses, so the dynamics involve the lower stages).

**** Pg 11 shows the P to P TF, and specifically that the large, second Pitch mode is stiffer that previous measurements. From past experience, we know that this mode is easily affected by cable stiffness (the higher the frequency of the mode, the stiff the cables are). We also know from past experience that we can arrange the cables in such a way that we can get the Pitch TF to be consistent between suspensions. We also also know that something has happened to the cable arrangement between the 2012-05-07 measurement and last night's measurement that has stiffened up the cabling. So, we should look at the cable arrangement again.

The control path takes input error signals from the CM PDH and PHASE servos, IMON, FMON, SMON.  These go into an input matrix, through an ARM_LONG filter, and then out to ETM_LONG control output.  In h2iscey, the ETM_LONG output is routed to the RFM sender to ETMY via h2susetmy.

I also added input filter modules for the other PD inputs (PDH_DC, {IR,GR,BB_PWR_MON).

h2iscey was recompiled, installed, and restarted.  The daq was also restarted to register the new channels.

I also updated the OAF medm screen to add links to the new filter modules.

Measurements have completed on H2 SUS ITMY as of ~10:30AM PST.

The assembly validation testing report for HAM-ISI Unit #5 is posted under the DCC for validation.

Reports regading the previous units tested/validated (Phase I) at LHO are also available on the DCC:

HAM-ISI Unit #1
HAM-ISI Unit #2
HAM-ISI Unit #3
HAM-ISI Unit #4