BSC2 NE Vert HEPI Actuator back in RUN mode (Hugh)

Operate HAM3 East Door RGA (John)

More work on TMTS (Transmon Telescope SUS) model by Mark B starts around 10:45am (requiring DAQ restart by Dave afterward)

PCal Work starting in H2 PSL Room (Pablo, Colin, Craig, Michael R.)

CDS Alarm:  several h1iscey IOP State Word alarms several times a day

Jim B shutting down framewriter0 (10:35am)

changing compressor at MX; gave instrument air alarm, and also Vacuum alarm for CP6 since we use Instrument Air for the valve. (Ski)

Crew here for taking water samples at 11:40am

MitchR, JimW

We started taking the eLIGO HAM6 ISI apart today, so that we can replace its sensors and cabling with aLIGO parts. Walls covering GS-13's were removed, then we started on the seismometers themselves, with 4 out of 6 removed. Horizontal CPS's are mostly out, we just didn't have cutters for some zipties. Tomorrow, we will finish up the pods, and strip the remaining cabling. We did find one bolt that galled as soon as we put a wrench on it (maybe before?), which ended up breaking instead of cooperating, and one bolt that threatened to gall, but it behaved after plying it with alcohol.

The following new RCG library parts have been added to the repository for use with the ISCEY/ALS model.

• Communication link with Beckhoff (in .../isc/common/models/STATECOMM.mdl, plus C source code in .../isc/common/src/RtCommunication.c)
  This part interacts with the RtCommunication.lib library in the Ethercat slow controls system (documented in E1300442), allowing it to exchange state bits with the realtime front ends via ADC and DAC channels.
  (see attachment 1 for detail)
• Schmitt trigger with HI and LO outputs (in .../cds/common/models/SCHMITTTRIGGER.mdl)
  This was added alongside the already existing Schmitt trigger module, which only provides a HI output.  (Since this is a hysteretic trigger, LO is not the same as NOT HI.)
  (see attachment 2 for detail)
• RMS trigger (in .../isc/common/models/LSC_TRIGGER.mdl)
  Added alongside the LSC trigger part, this part provides the complementary behavior (activating a trigger when the input signal goes LO).  This is useful when the input signal is an RMS.
  (see attachment 3 for detail)

Found instrument air was valved-out in the chiller yard -> something Ski was doing earlier -> Opened valve -OK

Per a request of Jeff K, I made an additional update to the TMTS_MASTER.mdl, to add DAQ requests for the 6 ...M1_DAMP_*_IN2 channels. I then rebuilt and restarted h1sustmsy.mdl.

In the process I noticed that there were error messages being generated from the following lines in the safe.snap (these may have been there yesterday, see alog 6883, but I don't recall), so I manually edited the file and removed the second half of each line.

H1:SUS-TMSY_M1_DAMP_P_STATE_GOOD 1 H1:SUS-TMSY_M1_DAMP_P_STATE_GOOD 0
H1:SUS-TMSY_M1_DAMP_R_STATE_GOOD 1 H1:SUS-TMSY_M1_DAMP_R_STATE_GOOD 0
H1:SUS-TMSY_M1_DAMP_T_STATE_GOOD 1 H1:SUS-TMSY_M1_DAMP_T_STATE_GOOD 0
H1:SUS-TMSY_M1_DAMP_V_STATE_GOOD 1 H1:SUS-TMSY_M1_DAMP_V_STATE_GOOD 0
H1:SUS-TMSY_M1_DAMP_Y_STATE_GOOD 1 H1:SUS-TMSY_M1_DAMP_Y_STATE_GOOD 0

Chris Wipf then reported that sometime in the last few days, the setting for the alignment offset gains in the safe.snap had been reset to 1 (whereas they are supposed to be magic numbers that convert mrad of desired offset to counts of actuation). So I transplanted the following lines from an hourly backup from 6/20/13:

H1:SUS-TMSY_M1_OPTICALIGN_P_OFFSET 1 -8.950000000000000e+01
H1:SUS-TMSY_M1_OPTICALIGN_P_GAIN 1 1.583586000000000e+02
H1:SUS-TMSY_M1_OPTICALIGN_Y_OFFSET 1 1.899000000000000e+02
H1:SUS-TMSY_M1_OPTICALIGN_Y_GAIN 1 5.171050000000000e+01

The updated master model and safe.snap have been committed.

The assembly of the TMS ISC table is essentially done.
As far as I know, the only missing things to be installed are:

- everything related with cabling - pico cables, cable brackets, cable posts and cable ties
- one leg of the high beam dump 
- the optic (HR532HR1064, E1000425) for the bottom mirror of the periscope is ready to be installed, it is packed and labeled in one of the plastic bins under the ISC optics table at EX. 
- lens tags for the 1" lenses of the green sled (f = -56mm, I gave them to Corey)

Yesterday we finished doing the "coarse" alignment of the 532 nm and 1064 nm paths (a picture of the set-up will follow).
We also tested the QPDs.
To align the path from the beam diverter to the high power beam dump we used the green laser beam at full power.
The "fine" alignment will be done once the ISC table is mated to the transmon telescope.

Entry by Kyle,

Start  4.5 x 10-7 torr*L/sec

End 3.8 x 10-7 torr*L/sec

(Dick, Daniel)
The readback of the  IMC/PSL VCO was flaky. Today, we concluded that the 3rd and 4th channel on the timing comparator/frequency counter do not work very well above 40 MHz. We put the PSL on the 5th channel and it now is reliable. We were also missing about 20 dB of signal. This turned out to be the splitter mounted to the patch panel in the LVEA which was operated in the wrong direction. Fixing this gave us a signal of about 3 Vpp.

A new medm screen with name ALS_CUST_FREQUENCIES.adl has been created which list all the VCO frequencies as well as linear combinations describing the various beat notes.

Activites From Today

Aaron/Dominick running accelerometer cabling from H1 Elec Room -> H1 PSL Room

9:00 Hugh/Greg replacing BSC2 NE HEPI Vert Actuator Valve (will be invasive)

~11:30 Mark B will do model/channel work on EY TMS (this later required a DAQ restart by Barker)

Rogers Contractor here for Mechanical Room work (for Kyle)

Rodruck replacing Dust Monitor in Diode Room

Jim/Cyrus taking down FrameWriter0 (9:36am)

Robert with SURF student at EY

HIFO Investigations 1:20pm (Dick)

Chris W worked on lsc & isc models in the afternoon

h2 isi storage dewar filling (Greg)

Sheila is working at EY in the afternoon

Maintenance: 

• Paradise Water
• Liquid Nitrogen to MY (CP3)
• Pallet Pick Up around 3:30pm

 RGA data from HAM 3:

Attached plots are:

HAM3 RGA only - RGA prior to opening any valves to the system - this is "as found" after starting the 2l/s ion pump on the RGA tree after moving from ENDY to the LVEA.

HAM3 RGA + T - Kyle and I installed a T fitting beween the RGA and the 10inch gate valve so that we could evacuate the "dead space" prior to opening to HAM3. This required opening the all metal 1.5 inch valve on the RGA tree.

HAM3 RGAall - this is with the RGa open to HAM3  - ie the 10inch gate valve was opened. The total pressure at HAM3 is estimated at  3 e-8 torr.

From the plot HAM3 RGAall the relative ion currents and partial pressures for some amus are:

amu 2 - 1 e-9 amps   ~5e-9 torr

amu 18 - 3e-10         ~9e-9 torr

amu 28 - 2e-10         ~ 6e-9 torr

amu 41 - 1.8e-12       ~ 5e-11 torr     corrected these values x10^-1

amu 51 - 1e-12          ~3e-11 torr

amu 69 - 5e-13          ~1.5e-11 torr

Assume that the total pressure = 0.5x amu2 + amu18 + amu28 you get a calibration of 1 amp = 30 torr.

For all these measurements the small 2l/s ion pump registered 3.8 mvolts or 0.038 milliamps ion current.

I am uncertain of the SEM voltage in these scans as the software appears to let me change the voltage and yet the plots look identical.

Note that the calibration gas of the RGA tree appears to be open to the system but it is not - the Nupro valve has been damaged and no longer seals completely.

This is a 2 hours trend when the end PDH signal was offloaded to the BSC6 HEPI yesterday (see alog 6862).

This worked good so far --- the end laser stayed locked for more than an hour without an obvious sign of misalginment.

Although we do see drift in the ETMY oplev signal as the amount of the offload increases. Since the alignment of the arm stayed good, this could be a longitudinal to angle coupling of the oplev itself.

The TMTS_MASTER.mdl has long had an error whereby the slow channel giving the text label for BIT4 of the ODC word was called H1:SUS-TMSY_ODC_BIT6 or the like. This caused the text field opposite BIT4 in the SUS_CUST_TMTS_ODC.adl screen to show white.

I fixed the master model and rebuilt and restarted h1sustmsy. I also manually edited the safe.snap file, changing _BIT6 to _BIT4, and confirmed that the old BIT6 value was being correctly applied to BIT4 on a BURT restore.

I committed the new master model and the new safe.snap file. Although the change didn't involve any channels being written to disk, David Barker restarted the DAQ as a precaution.

LLO should also apply this fix. Any scripts that initialize the ODC bit labels should be rewritten to no longer work around the error.

This is the current setup for our PLL-based frequency sensor and this reads out the beatnote of the green light at the vertex serving as a CARM sensor currently.

Here is a measured open loop transfer function of the PLL :

Some parameters and notes:

• UGF is at 60 kHz
• VCO DC response was measured to be 285220 Hz/V by a measurement with the IFR signal generator
• PFD coefficient was found to be 45 deg/V according to my eyeball fitting
• The was a phase lag which can be modeled by a delay of ~ 1.5 usec.
• The in-loop SR560 has
  • gain = 5, pole 300 kHz and another pole at 300 kHz
• The out-of-loop SR560 has
  • gain =10, pole at 100 Hz

These model parameters were used for calibrating  the analog CARM signal described in the previous alog (see alog 6878).The raw data is also attached.

One concern we had in the last CARM in-loop noise spectrum (see alog 6859) was that there might be more noise at high frequencies in which the digital system is normally unable to monitor. To check the high frequency situation I took a new CARM spectrum at the floor with an SR785 up to 100 kHz.

It looks like there is lots of noise at high frequncies mainly above 1 kHz. They are not identified yet at this moment. The plot is shown below.

The red curve is the one I newly took with the SR785 -- it matches with the previous measurement shown in cyan at around 2-5 kHz, indicating the calbiration of the analog signal is about correct. The cyan curve goes down rapidly above 5 kHz due to probabaly a down sampling filter. A huge peak in the red curve is located to be at 37 kHz corresponding to the FSR of the arm cavity. As for calibrating the analog signal I corrected the loop surpression of the PLL so that the plot should be valid even if it is above the UGF of the PLL which is at 60 kHz. The raw data is attached.

re WP 3999

We swapped the Parker Valve on BSC2 NE Vertical Actuator.  It went smoothly with little mess.  This Vertical Actuator remains in bleed mode for a time, at least an hour or several.  This means vertical drive of this corner is not possible.  If the HIFOY crew can not proceed come early afternoon, we'll forgo any further bleeding and put it back to Run mode for driving.  Otherwise we'll put it back into Run mode first thing tomorrow.  At the moment this disturbed position is not critical for the HIFO crew.  Attached are trends of the global position, it sure would be nice if the frames had the units contained...  I believe the units presented are nanometers & nanoradians.  So the horizontal positions are back: X, Y, & RZ; but, the vertical dofs are not.  Again though, currently, the HIFOY crew can work with it the way it sits.  If you think about the location of the corner we have disturbed, it's likely we have tilted the table around the barrel of the optic and therefore possibly have only rolled it.  Looking directly at the vertical IPS readouts of corners 2 & 4, (not plotted) there is a total pitch about the NW-SE axis of 1.5mm over the ~4m distance between the diagonal piers giving a roll of ~0.4mrads.

Noticed pressure increase on X-arm this morning -> Found that one channel of IP10 had shut off -> Turned channel back on and OK now -> Took this opportunity to change "STEP" values from 7000V-5000V-3000V to 5000V-5000V-3000V 

h1fw0 is currently offline for its upgrade, adding a local RAID storage device for raw minute trend archival. This means that h1nds0 does not have access to recent frame files. Most NDS clients are defaulting to h1nds1 and will not be impacted by this work. If you are using h1nds0, please switch to h1nds1 for the duration of this work.

[Matt, Lisa, Chris, Kiwamu, Alexa]

(This alog pertains to work done last night).

Last night we went to EY and adjusted several settings in both the PLL and PDH loops.

PLL LOOP:

We changed the settings on CMB_FIBR to increase the UGF of the loop. In particular, we turned off the output gain and decreased the input gain to -6dB. In addition, we turned the generic filter on. The settings are now as follows:

Common Compensation: ON

Boost one:  ON

Fast Option: ON

Generfic filter (in common path): ON

Input gain: -6dB

With these settings, the UGF is now 29kHz (up from 20kHz). We also measured the error signal spectrum and saw a peak at 28kHz.

PDH LOOP:

We also made changes on CMB_REFL. In particular we increased the input gain to 12dB. The settings are now as follows:

Common Compensation: ON

Boost one: ON

Input gain: 12dB

Output gain: 0dB

In addition, we altered the temperature control to reduce oscillations of the signal; on the PLL autolocker we reduced the slow frequency servo UGF to 0.01 from 0.035. We also tried using a 4dB attenuator on the RF modulator to see if that would reduce the oscillations; however, this did not seem to help.

With these settings, the UGF is now around 3kHz (down from 9kHz). Again, we measured the error signal spectrum and saw a peak at 28kHz. Clearly, we were seeing the features of the PLL loop in the PDH loop.

Additionaly, we saw that H1:ALS-Y_REFL_A_DC_POWER was oscillating vary rapidly from 50 counts to zero counts. As we misaligned the PD, the oscillation continued but reduced to 20 counts. If we completely blocked the beam, the signal dropped down to zero counts and remained so. As of last night, we left the PD slightly misaligned to reduce the oscillations in the PDH loop.

Attachments:

The attached pictures are as follows:

1) PLL transfer function

2) PLL error signal spectrum

3) PDH transfer function

4) PDH error signal spectrum

5) CMB_FIBR (as of this morning)

6) CMB_REFL (as of this morning)

Giles report from yesterday's work:

(Travis, Mark, Jason, Doug, Giles)

After leaving the PUM hanging overnight there was no further development of the crack. We then proceeded to re-lock the PUM and hang the ETM to perform modal measurements. Using the autocollimator we measured the longitudinal, pitch and yaw modes. We then setup and optical lever to measure the transverse, bounce and roll modes. Finally we measured the 4 fundamental violin modes. The modal data gathered was:         

Longitudinal    0.656 Hz

Pitch  1.09 Hz

Yaw  1.09 Hz

Transverse 0.656 Hz

Bounce 6.75 Hz (this will be sqrt(2) higher when the PUM is free)

Roll 9.6 Hz (this will be sqrt(2) higher when the PUM is free)

FR  505 Hz

FL  506.5 Hz

BR  506.5 Hz

BL  505 Hz

We finally installed the fibre guards and covered the entire lower stage.