y-arm mode scan

Attached is a mode scan of the y-arm cavity (ring heater on). Both the DARM offset and the frequency counter are calibrated in mircons for the y-arm.

- Our ALS-DIFF calibration is a factor of 3 off - I needed about 3 micron per count from H1:ALS-C_DIFF_PLL_CTRL_OUT, which advertises to be calibrated in micron.

- The expected transverse mode spacing for the y-arm is 8.5 kHz (Ritm=2307m Retm=2238.9m, The ITM is also currently being heated weigh the ring heater.).  The mode scan measurement is consistent with 8.5kHz, with an or or of about 500Hz.

- The problem with that is that the 45MHz sideband is 16261Hz  off the resonance, bringing the 20mode nominally to 738Hz .

- We suspect the the first side we tired to approach from (left side on the COMM offset slider) was contaminated by this mode. We're now trying the other side.

CO2P X-laser update

Thomas, Greg, David

HWS 
- X-end of table continued to be aligned.

TCSX -
- managed to get the FLIR camera to be connected up to a laptop. Will look to mount on-table tomorrow.
- measurements made to calibrate the on-table output power meter.  Maximum power of 2.36W for a rotation angle of 82.5degrees. 
- maximum measured power after the two polarizers was 40.85W.
- maximum measured power after the mask was 10.1W 
--> this would indicate that a maximum power of ~5W could be incident on the CP. Will investigate further.
TCSX laser will be left operating overnight.

The low transmission through the central mask is because 
 - that mask was designed for use in the central heating path 
 - the beam size in the annular heating beam path is ~2.5x larger than in the central heating path.

Gate Valve Operation

This morning GV5 and GV7 were soft closed for craning work in the CS VEA. Valves were opened by 12:39 pm.

OPS: reset of HEPI L4C Accumulated WD Counters Tuesday 20nd May 2014

HAM 4

ops

0905 - Richard working on ETM ESD in control room.

915 - Gerardo + John to MY to relieve pressure on valved out vacuum gauge (currently presenting 6e-5 torr)

925 - Jeff & Andres - Live at the H2 Enclosure one night only for OFI move to HAM5 Area and OFI Install.

945 - Travis & Margot & Fil - ACB staging area in LVEA (test stands)

1045 -  Praxair delivery

1102 - KingSoft onsite

1130 - Filiberto climbing on top of HAM 1 & 2

1330 - OFI install halted while Arnaud runs some TFs on HAM5

purge air back up HAM4-6

This morning (9:20am-ish) I turned the purge air back up that is plumbed into the East side of HAM4.  It had been reportedly turned down yesterday.  Soft covers which were weakly billowing are back to full billow.

SRM Surrogate Final Alignment Numbers

• X axis: 303.8 mm
  • Target: 305.3 mm
  • Error: -1.5 mm
  • Tolerance: ±4.6 mm
• Y axis: -19874.5 mm
  • Target: -19875.8 mm
  • Error: +1.3 mm
  • Tolerance: ±3.0 mm
• Z axis: -113.6 mm
  • Target: -114.5 mm
  • Error: +0.9 mm
  • Tolerance: ±3.0 mm
• Pitch: 545 µrad up
  • Target: 625 µrad up
  • Error: 80 µrad down
  • Tolerance: ±520 µrad
• Yaw: 56.809 mrad CCW
  • Target: 57.119 mrad CCW
  • Error: 310 µrad CW
  • Tolerance: ±820 µrad

SR2 WD re-connected to ISI WD

I re-ennabled the path from SR2 WD to HAM4-ISI WD in h1sussr2.mdl, then re-compiled and restarted it.

The new model is commited under the svn -r8034

Work was perfomed under WP # 4639 which is now closed.

SRM OSEMs aligned despite poorly designed brackets

This morning, I aligned the 3 stages of OSEMS (14 in total).  This involved some clean filing of one fo the middle stage brackets.  A month ago, we noticed that this bracket held the AOSEM already at an extreme in height range, however after beating the streets to see what could be done (via SUS engineering and SUS LLO), we decided to leave it and hope we didn't need more range.  The recent SRM mass alignment has sent a small differential pitch up the chain causing this AOSEM to now need more height range.  Dam*.  The bracket itself has slots for additional height adjustment, however the bracket then runs into the side of the AOSEM itself (hence the poor design statement above).  Since we can't do much at this point to fix the range, I disassembled the bracket, removed the AOSEM and filed the bracket down where it hits the AOSEM.  I used a Class B file.  There is another AOSEM hugging the edge of the mechanical range, but I'm leaving it for now.

 

With improved mechanical range on this one AOSEM, I was able to align it and the rest of the OSEMs.  I've run quick TFs in V, L, and R - all look good so the chamber is ready for OFI installation (and for Jason to post final alignment numbers of SRM).

Increase of the 45MHz modulation depth

Added a ZHL-1A RF amplifier to the 45MHz RF signal which goes to the EOM. The RF power measured at the patch panel in the LVEA is now 25.3dBm from 12.7dBm. There is a 6dB attenuator in front of the RF amplifier which can be replaced with a 12dB one, if the gain is too high. The modulation depth was measured in alog 9395. There seems to be a 2dB loss between the LVEA patch panel and the EOM. If correct, the modulation depth is now 0.3 and the 3f-signal strength about 70 times higher. With a little bit of cable and barrel magic the phase was restored to within 1 degree.

changes to SUS guardian

Arnaud and I have made some changes to the SUS guardian.  We broke up the graph such that the requestable states are now idle states that don't actually change the state of the suspension:

The dark blue states, which are the requestable states, now only check the alignment and watchdog status.  The reason for this change is so that guardian being in e.g. the ALIGNED state actually indicates that suspension is fully aligned.  Previously guardian would enter the ALIGNED state, even before the offsets had fully wrapped to their alignment values.  Other guardian nodes that might be watching the SUS guardians for optic alignment would therefore be misled.  This just makes the state more explict.

I also removed the goto flag from the RESET (was SAFE) state due to a bug I discovered in guardian.  The bug is that if there is a goto on the graph, then the INIT state will not be executed.  This is something I need to fix in guardian.  In the mean time, I just made all the desired transitions explicit.

Replaced Cable For ISCT1 Lights

Thought the issue was a bad switch, but it was actually one of the cables.  I swapped this cable out (which wasn't easy since it was hard to see where the cable connector needed to go [& these connectors suck!]). 

dust monitor code updated to 1.3.0

This completes WP 4633.

This was done to communicate with the MetOne model 6000 installed in the H1 PSL diode room.

The h0dustdr, h0dustex, h0dustey, h0dustlab, h0dustlvea, h0dustmx and h0dustmy target directories in /ligo/lho/h0/target were copied to /ligo/lho/h0/target_archive and updated. The h0dustex, h0dustey, h0dustlvea and h0dustlab IOCs were restarted and burtrestored to the snapshot files in /ligo/cds/lho/h0/burt/2014/05/19/08:00.

The h0dustdr IOC was started. The settings were changed to:
Sample Time: 20 seconds
Hold Time: 300 seconds
0.3 micron minor alarm: 100
0.3 micron major alarm: 200
0.5 micron minor alarm: 100
0.5 micron major alarm: 200

MID Y vacuum PT246

Gerardo and I pumped out the dead space around PT246 and closed the valves to their prior state.

notes from tuesday morning meeting

SRM looking good; Betsy plans to do final check and hand off to OFI today

Apollo will be craning OFI over beam tube

Gerardo s. closing GV5/GV7 in anticipation of craning

HAM4 ISI floating, HEPI locked

McCarthy and Fil pulling cables at HAM5/6

Dan Hoak/Corey working on SLED buildup for HAM6

TCS calibrating CO2Y, troubleshooting interlock system CO2X

laser hazard expected ~1400

Corey swapping light in ISCT1 and manhandling things with Bubba in the squeezer bay

control room tour expected 1230-1300

King Soft expected