TMS F1 Mirrors Arrive

After much anticipation, we finally receive a pair of bought Ag-coated mirrors from Newport.  Within seconds we were able to tell these guys were much better ("order(s) of magnitude better", says Keita) than any other TMS mirrors used for LIGO.

One of them only had a few "spots" which could be seen from the front with light behind it.  And this one had no "cloudiness" observed with many other mirrors.  The second mirror had minor cloudiness (but they "cleared up"?), and this one had virtually NO holes in it.  

Both were cleaned and we took out to EX TMS Lab.  We removed the Alignment mirror serving as an F1 Mirror and upon installing the new Newport mirror, Keita noticed that these mirrors are thinner (!).  They are probably a couple millimeters thinner than the original mirrors.  We were able to accomodate the mirrors by screwing the pitch/yaw actuators out a little more.  New mirror was installed and this is where we stopped for the day.

I would have liked to install the tons of pictures we took, but RESOURCE SPACE HAS BEEN DOWN!!!  (all afternoon and evening)  :(

Attached to this entry are a sample of photos.

SLC - Manifold Cryopump assembly and installation & Arm Cavity Baffle assembly

Mitchell Robinson, Scott Shankle, Thomas Vo -

Arm Cavity Baffle Suspension Assembly is complete and ready to suspend.
Baffle Box assembly is in process.

-----------------------------------------------

Mitchell Robinson, Scott Shankle, Apollo's Randy and Scott -

All participants reviewed the Installation Procedure and the Hazard Analysis.
The Manifold Cryopump Baffle was brought down from the Balancing Fixture.
The Flange Protectors and Baffle Alignment Tooling were attached to the spool.
Yet, this baffle continues to be a complete pain in the derriere -
the newly fabricated Spacer/Shim's holes are too small.
Team will be looking into the feasibility of a clean modification.

----------------------------------

State of IFO For Tonight

For the DetCharians: as of
1058670016
July 23 2013 20:00 PDT
Jul 24 2013 03:00:00 UTC
we are leaving the IFO in the following configuration:

Input Mode Cleaner: LOCKED (offload to MC2 stages M2 and M2 only, under slow WFS control)
Green Arm: LOCKED (no offload to HEPI)

HAM2 & HAM3 HEPI: Floating, with offsets, but no control
HAM2 & HAM3 ISI: Level 2 isolated
All HSTS SUS: Level 1.5 "resg" damping filters filter
PR3: Level 1.0 damping filters

ITM HEPI: Locked
ITM ISI: Level 2 isolated
ITM QUAD: Level 2.1 damped

BS HEPI: Level 2 isolated 
BS ISI: Level 2 isolated, but had to diable GS13 watchdogs while isolating to get it up and running
BS Triple: Level 2.0 damping filters

ETM HEPI: Level 2 isolated
ETM ISI: Level 2 isolated
ETM QUAD: Level 2.1 damped

May it stay locked all night!
The calibrated channel for green is H1:ALS-Y_REFL_CTRL_OUT_DQ, in [Hz] (so multiply by lambda*(L/c) to get [m])
The calibrated channels for the IMC are 
IMC_L = H1:IMC-X_DQ in [m]
IMC_F = H1:IMC-F_OUT_DQ in [m]

Note, I missed Vincent's comment about turning on the ST0 to ST1 feed forward in his BSC-ISI and BSC-HPI instruction manual, so none of the BSC-ISIs had their ST0-ST1 FF on for this lock stretch. (This may explain the difficulty behind getting ISI-BS up and running).

HAM2 HAM3 HEPI : unlock was successful

[Jeff K., Kiwamu]

We took a look at the IMC locking after Hugo was done (alog 7189).

The tranmitted light still reaches 2300 counts at H1:IMC-MC2_TRANS_SUM_OUTPUT wihtout tweaking alignment which is good even though the WFS is not engaged.

HAM2 HAM3 HEPI Release - IMC Alignment Reestablished

HAM2 and HAM3 HEPI were released today.

 

Raw IPS readouts were recorded prior to release. The following offests were set in the actuation path to reestablish alignment, based on the IPS readouts:

	OFFSETS (cnt)
	HAM2	HAM3
H1	370	900
H2	800	200
H3	-600	350
H4	-400	-650
V1	450	300
V2	460	-650
V3	1050	200
V4	900	1250

 

 

IPS readouts were recorded after reestablishing alignment:

 

	NEW READOUTS (cnt)
	HAM2	HAM3
H1	1438.7	6664
H2	957.61	-4089.2
H3	2089.2	9159.3
H4	-1238.1	-2252.5
V1	-2796.8	2709.1
V2	-608.92	-6394.7
V3	1029.5	2257
V4	-2862.8	-9434.1

 

 

The Before/After difference in IPS readout is shown below:

 

	BEFORE/AFTER DIFFERENCE (cnt)
	HAM2	HAM3
H1	107.6	146.6
H2	0.11	588.7
H3	68.2	169.1
H4	65.5	104.3
V1	54.1	155.1
V2	97.09	32.3
V3	4.5	144.5
V4	20.1	38.3

 

 

The remaining shift in alignment induced by unlocking HAM2 and HAM3 HEPI is less than 0.25mils (147 counts on the IPS), on each pier, after reestablishing the alignent with offsets on the actuation path.

Pumping spool annulus at X-mid

Vented spool (in place of iLIGO BSC5) annuli -> No inner O-ring leakage -> removed temporary O-ring valves from bolted joint pump ports and connected permanent ion pump piping -> pumping annulus system with aux. cart overnight

ALS Calibrated Cavity Length Channel

For future reference,

The calibrated channel representing the frequency of the green laser (in [Hz]) is
H1:ALS-Y_REFL_CTRL_OUT_DQ


This can be converted to the length of the arm cavity using the free spectral range,
Cavity Length = lambda * (L / c) * H1:ALS-Y_REFL_CTRL_OUT_DQ

Careful: Since we implemented a bypass path from the PDH board to the laser, there is 22dB less signal on H1:ALSY_REFL_CTRL_OUT_DQ (the fast slider on the Sigg board is at -22dB, since this signal is now goint to the laser).

This means that the calibration has to be corrected by these 22dB. See elog 6900.

WHAM2 & 3 HEPIs Unlocked *** Caution ***

GregG unlocked these suspensions and they are now floating again after a long hiatus of sequestration.  Please regard the "Unlocked" signs and be mindful of any mechanical shorts against the floating elements.  If you drop a screw or other smaller item, don't just forget about it as it may short the suspension too.
Please avoid stepping on the Crossbeams if you don't wish to hear about it from BetsyW!

Ops shift Summary

Bubba craning small loads over tube (consulted with Worden)
Lots of CDS work for Maintenance…
Paradise Water on site.
Arnaud started running Transfer Functions on HAM2/HAM3
Work on HAM 2 - Hugh

CDS Maintenance summary

today we restarted the DAQ about 16 times. I'll abbreviate this as DR.

First due to the restart of h1iscey the new h1pemey model was loaded. A DR was needed to resync the DAQ.

I created a new h1peml0 model as per Roberts latest changes. I restarted h1peml0 and did a DR.

Bad DUST channels in the DAQ. We found that some of the DUST EPICS channels went bad in the frame starting 7/9 when I added EX to the DAQ. To verify this I first took out all the ECAT channels from the EDCU (DR), and then I removed all the EX systems from the DAQ (DR).

The number of EDCU channels changed from 195,003 to 191,506 to 173,744. At the lowest number the DUST channels became good again.

To figure out what number of channels would break it again I put the ECAT channels back in (DR) and then h1susex (DR). The number of channels went to from 177,241 to 185,360 at which point some DUST channels went back to not as many. Later I put the system back to the full 195,007 (DR) and the full set of bad DUST channels came back.

For more info we moved DUST channels around in the H0EDCU_DUST.ini (DR) and found that the position within the file determined which ones were bad (for e.g. 3rd and 5th slots were bad). We moved the order of the H0EDCU_DUST.ini in the master file (DR)(did not change anything) and removed the H0EDCU_WEATHER.ini from the DAQ (DR)(did not change anything).

Hugo found ADC noise on the ISI HAM6 system. We power cycled the h1seih16 front end computer and the IO Chassis with no success. I removed the ADC cable and the noise went away. At this point I handed the problem over to Richard and Filiburto.

The latest Beckhoff ini files were ingested into the DAQ (DR)

A reminder that all our fast DAQ channels show up in RED due to the incorrect dataValid flag. This will be fixed next week when we upgrade to RCG2.7

Re-installed H1:SUS-BS CART2EUL Matrices

J. Kissel, A. Pele

For some reason the CART2EUL Matrices had been lost over some reboot / burt restore cycle. We've re-installed them, and captured + committed a new safe.snap. 

Install instructions:

]$ matlab -nosplash -nojvm
>> cd /opt/rtcds/userapps/release/isc/common/projections/
>> load ISI2SUS_projection_file
>> fill_matrix_values('H1:SUS-BS_M1_CART2EUL',ISI2SUSprojections.h1.bs.CART2EUL)
>> fill_matrix_values('H1:SUS-BS_M1_EUL2CART',ISI2SUSprojections.h1.bs.EUL2CART)
>> cd /ligo/svncommon/SusSVN/sus/trunk/Common/MatlabTools/
>> save_safe_snap('H1','BS')
>> exit
]$ svn commit -m "New safe.snap file for H1:BS" /opt/rtcds/userapps/release/sus/h1/burtfiles/h1susbs_safe.snap

IMC demodulation phase rotated again, temporarily fixed

The demodulation phase of the IMC rotated by approximately 90 degrees. This is the third time to see this kind of phase rotation in the IMC. Very strange.

• A brief history of phase rotation
  • 1st  2013.July.16 (alog 7108)
  • 2nd 2013.July.17 (alog 7119)
  • 3rd  2013 July.23 (NEW !!)

Temporary fix:

Temporarily I switched the signal from the I to Q signal by changing the actual cabling at the corner field rack and flipped the control sign at H1:IMC-REFL_SERVO_IN1POL by toggling the switch in the upper left of the IMC board screen. The IMC is now locking and should serve as an interferometric monitor for the sus and seismic people. The WFS loops are currently disabled by setting H1:IMC-WFS_GAIN to be zero to avoid a meaningless control. It seems the IMC started dropping its lock after Roberts and his company entered the PSL enclosure. The temperature transient somehow caused it ? It is unclear.

By the way the attached is a picture of the current I-mon and Q-mon signals in a X-Y projection. The I-mon is x-axis and Q-mon is y-axis. You can see a line almost in parallel to the y-axis indicating that the IMC length signal shows up mostly in the Q-phase.

HAM2 and HAM3 SEI Alignments

Prior to releasing HAM2 and HAM3 HEPIs, we recorded the readouts on the postion sensors of the ISIs, and HEPIs, of the input mode cleaner.

 

HAM2 ISI, raw CPS readouts, in counts

H1            -3388.2      

H2            -2936.6      

H3            -504.78      

V1           -138.78      

V2            -966.74      

V3            -737.11      

 

HAM3 ISI, raw CPS readouts, in counts

 H1           -526.93       

 H2           266.35         

 H3           -175.73        

 V1           -1405.1        

 V2           -1102.9        

 V3           -560.2          

 

HAM1 HEPI, raw IPS readouts, in counts

H1            8075.8         

H2            -2940.6       

H3            -8136.2       

H4            -1306.2       

V1            182.27         

V2            4545.2         

V3            -1657.4        

V4            -1572.6        

 

HAM2 HEPI, raw IPS readouts, in counts

H1            1331.1         

H2            957.72         

H3            2157.4         

 H4           -1303.6       

 V1           -2742.7       

 V2           -511.83        

 V3           1034             

 V4           -2882.9       

 

HAM3 HEPI, raw IPS readouts, in counts

H1            6517.4         

H2            -4677.9       

H3            9328.4        

H4            -2148.2       

V1            2864.2        

V2            -6362.4       

V3            2112.5         

V4            -9395.8       

HAM2 and HAM3 SUS Alignments

In preparation for unlocking HAM2 and HAM3 HEPIs, here are the alignments and static positions (as measured by the OSEMs) before unlocking, for reference.

HAM2 (* indicates alignment offsets are OFF currently, because Arnaud is measuring some lower stage transfer functions)

               MC1     MC3     PR3     PRM
P  [urad]     +312    +261    -148*   -770*    
Y  [urad]     -968   -1081     124*  -1200* 

M1T1 [ct]    12247   15407   11976    12430
M1T2 [ct]    13061   15166   16039    14890
M1T3 [ct]    13600   14370   15890    13874
M1LF [ct]    15975   15170   10659    11306
M1RT [ct]     9539    7682   10424    11068
M1SD [ct]    11831   11578   13022    12813
M2UL [ct]    16070   18355    7212    17435
M2LL [ct]    20649   14340   10466     2510
M2UR [ct]     7266   12539   10768    17270
M2LR [ct]    14008    9908    8883     2492
M3UL [ct]    14414   15096    7667    16049 
M3LL [ct]    21812   15740   10337     3730
M3UR [ct]    10138   11881   10654    14385
M3LR [ct]    18289    7221    7899     4566


HAM3

             MC2       PR2
P  [urad]   +434      +716*
Y  [urad]   +244      +120*

M1T1 [ct]  13708     14293
M1T2 [ct]  12670     12692
M1T3 [ct]  13585     12476
M1LF [ct]  12330     13635
M1RT [ct]  13636     14635
M1SD [ct]  14254     13127
M2UL [ct]  11830     14296
M2LL [ct]   9944     15369
M2UR [ct]  12493     12516 
M2LR [ct]  13180     12042
M3UL [ct]  11333     12223
M3LL [ct]   9213     14342
M3UR [ct]  11356      8504
M3LR [ct]   8200     14608

Beamsplitter Optical Lever Alignment

The BS optical lever has been realigned with HEPI unlocked (and untripped), ISI damped  and SUS damped.  This is also with a verbal OK from ISC saying that the current alignment of the optic is good.

dust monitors in LVEA

The dust monitors in the LVEA are NOT currently being recorded. It appears swapping the dust monitor in the H1 PSL enclosure has broken the communications.

Upon startup the IOC communicates correctly with each dust monitor until it gets to location 16 (the one that was swapped yesterday). After this it starts reporting back errors of the form:

Error: ../commands.c: 49: Sent command � not echoed
Received ?

I powercycled the Comtrol this morning. It worked after location 16 for a little while, but the error has returned.

Robert says he swapped the dust monitor in the H1 PSL laser enclosure.

First one dust monitor was disconnected from the breakout box outside the entire H1 PSL enclosure. If I recall correctly, the dust monitor at location 16 was then still found by the IOC. The communication errors persisted. The first dust monitor was plugged back in and the other one disconnected. The IOC still found the dust monitor at location 16, but the communication errors went away. The dust monitor at location 16 reported calibration errors.

It may be that the wrong dust monitor was swapped, leading to two set at the same location number, but this would not explain why the communication errors persisted after the first one was disconnected.

As it stands, one of the dust monitors in the H1 PSL enclosure is disconnected. The dust monitor at location 16 is reporting calibration errors. I am not sure where the dust monitor at location 16 is. The dust monitor at location 10 is not found by the IOC. The remainder of the dust monitors in the LVEA are running again.

Sheila swapped the dust monitor in the anteroom with one programmed at location 10. The one she removed from the anteroom is labeled 'H'. It had no charge left in the battery when I got it.

There was no change in the status. The dust monitor at location 10 is still unseen, and the dust monitor at location 16 is still giving calibration errors.

This leads me to believe that:
The dust monitor at location 16 is in the laser room and has calibration errors.
The dust monitor at location 10 is in the anteroom and is unplugged at the breakout box outside the enclosure.