ETMY pitch opt lever spectra

Attached a comparison of ETMY pitch optical lever with ISI damped with/without FF01 2 feedforward (HEPI L4C to Stage 1 ISI) engaged on ST1 X-Y-Z

In red : ISI damped, SUS damped filter gain = 1

In green : ISI damped, SUS damped filter gain = 4

In blue : ISI damped + FF, SUS damped filter gain = 3

In pink : ISI damped + FF, SUS damped filter gain = 1

Helium background too high to look for GV6 leak

The helium background as the result of testing GV1's outer bonnet O-ring leak (2 days ago) is 1x10-6 torr*L/sec, i.e. too high to quantify GV6's leak -> The only way to be rid of it is via turbo pumping -> We don't valve-in turbos unattended while open to the BT so we can't pump this out overnight.  Rather, we will valve-in the YBM turbo during business hours over the next few days

Ops Morning Summary

EX--running cable to tms

Barker/Batch:  LSC/ASC Naming problems

EY BSC-ISI measurement:  10:35-11:35am (Vincent)

Arnaud wants to do measurement on ETMy (after Vincent)

Michael R worked on the H1 PSL FSS this morning to help with HIFO Yarm locking.

(Thomas is cover the last 3hrs of my shift---thanks, Tvo!)

The "inicheck" program has been updated

The program "inicheck" (not the RCG perl script) has been updated to perform more strict channel name checking.  Bad combinations of ':', '_', and '-' characters are checked as well as characters outside the range A-Z, 0-9.  For detailed information, see the man page for inicheck.

ALS common mode feed-back, including 4Hz:4kHz boost closed - IR beam stays on top of resonance

(Alexa, Chris, Kiwamu, Lisa, Matt, Stefan)

We successfully handed of the ALS common mode feedback to MCL, including AO path, and engaged the common boost. This kept the IR arm power within about 20% from its max.

The setup for our PLL was as follows:
- SR560 A: gain -2; pole at 300kHz, hooked up to Imonn, feeding back to VCO tuning
- SR560 B: gain: 5; pole 100Hz, hooked up to output of SR560 A, output goes to a gain of 2 analog box, and then to the CM board input 1.

Tricks we used along the way:
 -The MC notch filters were all turned off.
- First was AC-couple the MC_L path and turn on the REFL_SLOW path at low gain. This brings the PLL into its lock range by moving the IMC.
- Next we turn off the MCL path
- Then we increase the ALS_MCL path by a factor of 30, bringing its x-over to about 150Hz. THen we engage a digital LF boost. 
- Next the AO path is turned on until the x-over drops to about 100Hz.
- With the H1:LSC-REFL_SERVO_IN1GAIN at +15dB we engage the analog CM boost filter.


Some gains we used in the final state:
H1:LSC-REFL_SERVO_IN1GAIN 15
H1:LSC-REFL_SERVO_FASTGAIN 0
H1:IMC-REFL_SERVO_IN1GAIN 0
H1:IMC-REFL_SERVO_IN2GAIN 2
H1:IMC-REFL_SERVO_FASTGAIN 0

The scripts that do all the magic, CARM_down and CARM_handoff are in 
/opt/rtcds/userapps/release/als/h1/scripts

more pictures to come...

ETM03 PUM in oven.

As of 4:30 this afternoon, Gerardo and Gerardo Jr. were in the process of loading the replacement PUM into the airbake oven, the last step needed before use in a monolithic suspension. Tomorrow morning it can go to an end station for welding. Knock on wood. Well done powering thru placing 2 prisms and 4 magnet mounts, cure times included, in 2 days, guys.

Great Job Gerardo^2!

Your fast work is really appreciated.  Marty

video switch

Dave B., Jim B., Patrick T.

The code for the Knox Chameleon HB video switch was started in screens on h0epics2 today. The module version is knox_chameleon_hb-1.0.2. The IOC version is video_knox_chameleon_hb-1.0.1. The sequencer version is seq-2.1.12. These reside in /ligo/apps/linux-x86_64/epics-3.14.12.2_long_sc and were compiled on cdsws0. The target is in /ligo/lho/h0/target/h0video.

VCO work

New code was loaded to add an integrator to the low noise VCO which allows the frequency to be be stabilized to a set value. The DC offset slider is used as the actuator. Since the frequency is only read once every second, this is only useful for drift control.

A temporary Agilent frequency counter has been set up in the CER to independently monitor the VCO frequency (ALS DIFF). At first glance the measurements are comparable.

Drift of free running VCO over 15 hours. 

DAQ reconfigured

WP3984

The DAQ was reconfigured and restarted for the following changes:

• DAQ broadcaster reconfigured to add 2 new channels requested by John Z
• Daniel and team-Beckhoff created a new H1EDCU_ECATC1PLC2.ini file
• Added EY HEPI Pump Controller to the DAQ
• Mark's h1susim changes have modifed the INI file for this frontend model

All changes were made, this closes out WP3984

Fiber Pulling Machine maintenance

The fibre pulling machine had been showing some problems with reproducibility when last used by Alastair Heptonstal. We had a look at it and after checking the red to IR beam alignment (which is perfect) and some trivial re-alignment of the upper and lower clamps, it looks like the main problem is wear in the bearings on the motor of the spinning mirror. The symptom is that the red tracer beam draws out a sinusoidal like pattern rather than a straight line on the stock and that it moves around slowly (~ one to a few seconds timescale). Increasing the motor speed makes this worse, decreasing it makes it better. However, slowing the motor down means that the heating does not appear constant as far as the silica is concerned. We pulled and profiled fibres at fast and slow speeds and the slower speed ones were almost acceptable whereas the fast speed one was way off.
Doug Cook is going to order a replacement part and fit it when it arrives. With the new motor and standard speed (8.55V to the motor) the machine should be back to its old self.
Angus & Giles

06/18/2013 Ops Summary

- Mark B upgrading HAUX model
- Apollo moving TCS tables over the X beam tube in corner station
- Kyle R closing GV5 to leak check, reopened at ~3:50 PM. Removed turbo from HAM3.
- PCAL work in H2 PSL enclosure
- Rick S & Michael R got the H1 PSL back online
- 2 DAQ reboots
- Arnaud running transfer functions on EY

ETMx QUAD Upper Suspension Installed

Travis, Betsy, Joe O'Dell (RAL, UK)

This afternoon, after jockying the genie lift and the Upper Structure numerous times under the test stand, we finally managed to install it on the BSC 9 ISI which is parked on the test stand.  The QUAD is tucked into a corner of the ISI with only inches of room to between it and the test stand on 2 sides.  This will make for another painful assembly due to this.  At least there's a gap between a few stages on the ISI which we can crawl through to reach areas we need to access on the QUAD.

Soft-closed GV5 for R&R of vacuum items on East door of HAM3

Removed 500 L/sec turbo from East door of HAM3 and installed Rai's RGA in its place -> roughed out dead volume between 8" gate valve and 1.5" metal valve but left 8" gate valve closed 

John W. opened GV5

EX TMS Work

(Cheryl, Corey, Jeff B., Lisa, Virginio)

EX TMS Lab

As of yesterday, this lab is now primed and ready to go.  We are requiring full cleanroom suits to enter.  The AC could be better (it's a little warm in there).  We now have parts out and are begining to build TMS Sub-Assys.  Pictures of the Lab are here.

All of this morning, Virginio and I unbagged parts and set up the lab for assembly.

TMS In-Vac Table Assy

Started building this Assy today.  As I was building it, I noticed we did not have vented washers, so I called it a day and started a search---I think we should be fine.  Want to get this assembly built ASAP so Lisa & Matt can layout optics on this Table (Lisa started cleaning small optics yesterday). 

TMS Telescope Assy

Virginio has started this assembly.  Upon building, he noticed one of the Teletube Assys had spots of rust on it.  We have India Tubes, so he swapped it with an extra one. (does rust on a part mean we do NOT want it in the vacuum system??).  Pictures of the rusty Tube are here.

Damage to 9" Parabolic Telescope Mirror Container

Yesterday I received a box which had a Pelican box (internally-cushioned hard suit case) with all four of the Mirrors for the Telescope.  Unfortunately, we discovered that the 9" Parabolic Mirror (the biggest one) was in a plastic container which failed.  The container cracked and the mirror looks liked it bumped about in the container during its trip to LHO.  There are noticeable particulates on all surfaces of the mirror.  And there also looks to be a big scuff mark on the edge of the front surface from where the mirror rubbed against the container.

The plan is to move on and clean all four optics.  Hopefully the big optic is useable.

Pictures of the optics are here.

Receiving Of TMS Parts

We've been deluged with TMS parts last week and this week, and between Cheryl, Jeff, and myself, we've beeing doing our best to keep the TMS wave at bay.  :)

HPO diode currents adjusted

Rick S, Michael R

Yesterday Rick found the PSL output power was about 20 W too low. Some AEI people suggested we increase the pump light to get back our power, so today we went inside to adjust the pump diode current and temperatures. We made the following current and temperature changes:

• DB1: 50.9 A to 51.4 A, +1 C
• DB2: 49.2 A to 49.7 A, -5.5 C
• DB3: 50.4 A to 50.9 A, -3 C
• DB4: 49.2 A (unchanged) -0.5 C

Temperature changes were applied to all the diodes in one box, we did not adjust individual diode temperatures.

When we were adjusting diode box temperatures, we expected to get more power as we moved the center of the pump light spectrum toward 807.5 nm. However, we found each box was optimized at a different wavelength:

• DB1: 807 nm
• DB2: 806.25 nm
• DB3: 808 nm
• DB4: 807.75 nm

The diode boxes are closer to 100% than before, but are still a few percent off. We could bring them back to 100% but the output power of the laser would drop, and we couldn't get the power back by adjusting temperature. DB3 in particular wouldn't cooperate, and is now at 95.7%. Another unusual thing about DB3 is the EPICs readout of the current on this box is 101 A. However, the power supply box in the diode room is reading the correct 50.9 A. The green bar on the Beckhoff screen displaying the diode current shows this 101 A as well, but the numerical value is still at 50.9 A. We're not sure why this is.