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Work will be starting today on the new DCS area in the VPW as well as outside between the H-2 building and the VPW. Today's activities will include some shallow excavation work outside by George Grant Construction. Inside work will include hanging a temporary curtain in the VPW to isolate the construction area from the C & B area and layout for refrigeration lines by Apollo and George Grant.

model restarts logged for Mon 24/Nov/2014
2014_11_24 06:39 h1fw0
2014_11_24 17:43 h1fw0

both unexpected restarts. Conlog frequently changing channels report attached.

Stefan, Matt, Kiwamu, Evan, Alexa

• ALS DIFF and COMM are working great tonight with the ETMX L2P changes with the oplev running (see Stefan's alog)
• We lock DRMI+arms off resonance much faster if we bring the input power down to 4W, at which point we can easily transition back to 10W without breaking the lock. This is all implemented in guardian now.
• Kiwamu changed the gain of POP18 whitening gain by a factor of 4 because the ADC was saturating
• We added the SRCL mode hopping offset for DRMI+arms off resonance until the asc wfs kick in (the asc wfs turn on faster than before thanks to Dan's modifications, but still should be faster). We also made an edit to the asc wfs loops (see Matt's alog).
• We adjusted the REFLBIAS digital filters to reduce the amount of confusion -- we were compensating and un-compenstating for the same zero/poles with FM3, FM4. Now we just use FM6 (p1.6z40) to compensate for the Boost engaged in the COMM PLL Board to CM Board Path
• Since sqrt(TRX+TRY) goes as 1/f^2 we added a f shaped filter (FM9: z35:p1k) to match the 1/f shape of the ALS COMM loop shape
• The "right side of the river" for bringing the arm off resoance: set frequency offset should be -1000 Hz on the ALS COMM VCO. This has been updated in the guardian
• The ALS COMM FIND IR takes too long; especially the fine tune portion.
• We have transitioned to sqrt(TRX+TRY): With an ALS COMM offset of -150 Hz (green), we engaged REFLBIAS in the first input of CM board. I have attached a StripTool screen shot showing these loops locked; one can clearly see the noise reduction in the IR transmitted signal once we handoff. Some configuration stuff:
  • LSC-TR_CARM_OFFSET = -0.8
  • LSC-TR_CARM FM1 (to pm) and FM9 (z35:p1k) are ON
  • LSC_REFLBIAS FM6 (p0:z1),, FM9 (p1.6:z40) are ON
  • LSC_REFLBIAS gain 0.8
  • LSC-REFL_DC_BIAS gain 1
  • CM Inp1 0dB, CM Inp2 -4dB
  • We engage REFLBIAS gain first, then turn on FM6. Then we reduce CM INp2 down to -32 dB slowly and then turn off the input.
  • We use an ezca servo to adjust the ALS COMM PLL VCO offset so that we don't battle with the REFLBIAS input into the CM board.
  • This is all implemented in guardian CARM_ON_TR except for the CM inp2 ramp down.
  • We took a transfer function of sqrt(TRX+TRY) / CARM; this produced the expected 1/f^2 shape with a detuning peak at around the cavity pole of 40 Hz (see ALS_TR_HANDOFF.pdf -- The blue trace is without DRMI, ie PRM and SRM are misaligned with IR off resonance in the arm, while the red trace is with DRMI_arms off resoance in the configuration described above).
  • We also compared the REFLBIAS signal to the REFL_SERVO_SLOW_OUTPUT (which is essentially REFLBIAS + (-4dB)*ALS_COMM_PLL_CTRL). This looked as we expected. Stefan will add a comment.
  • We were able to increase the LSC-TR_CARM_OFFSET to -1.
• We only had to align the IFO once this morning!
• GPS 1100940241 at the end of the lock.
• Dear Dave, the load matrix is failing to load a lot.

LVEA: Laser Hazard
Observation Bit: Commissioning  

06:45 Karen – Cleaning in the LVEA
08:00 Tweaked the ISS Reference Signal voltage to raise Diffracted Power up to 8.5%  
08:47 Manny – In LVEA to check power racks near HAM2
09:00 Bubba & Mitch – Remove top from HAM ISI Storage Container and position Cleanroom
09:11 Filiberto & Aaron – At End-Y working on PEM power
09:13 Lockheed Martin locating services on site checking route to VPW
09:30 Cleaning crew – First cleaning on storage move cleanroom  
09:45 Bubba & Mitch – Finished in LVEA 
10:00 Bubba – Big-Red moving BSC Storage Container from LVEA Hi-Bay to Staging building
10:20 Added 300ml of water to Diode chiller
10:52 Bubba – Finished moving BSC Storage Container to Staging building
11:37 Filiberto & Aaron – Back from End-Y
11:50 Grant on site to deliver equipment for trenching work
12:35 Hanford testing emergency alarm system   

Alexa, Matt

In an attempt to get stable, if low-bandwidth, loops, we made some cut-off filters.

The new ASC filter in FM5 is:

LP0.2 zpk([0.0025+i*0.499994;0.0025-i*0.499994],[0.1+i*0.0979794;0.1-i*0.0979794;0.05+i*0.193649;0.05-i*0.193649],1,"n")

A couple of old filters that got lost were:

ASC_PRC1_Y FM5 "res1.35" resgain(1.35,10,10)resgain(3.16,10,10)
ASC_MICH_P FM5 "LP15_new" ellip("LowPass", 4, 1, 20, 15)cheby1("LowPass", 2, 1, 100)gain(2, "dB")
 

Aaron and I continued with PEM cabling at EY this morning. We have completed all long cables runs and started installing the permanent power supplies in the DC rack. We disconnected the power supplies powering the microphones in both the VEA and EBAY and placed them in the DC rack. Got a call from commissioners asking us to leave EY, before we could reconnect microphone power with permanent power supplies. Will go back tomorrow morning and power them up. 

PSL Status: 
SysStat: All Green, except VB program offline 
Output power: 33.2w  
Frontend Watch: Green
HPO Watch: Red

PMC:
Locked: 4 days, 16 hours, 33 minutes
Reflected power:    2.6w
Power Transmitted: 22.9w 
Total Power:       25.5w 

FSS:
Locked: 0 days, 0 hours, 43 minutes
Trans PD: 1.810v

ISS:
Diffracted power: 9.39%
Last saturation event: 0 days, 14 hours, 28 minutes  

Work on PEM power at End-Y
Locate Services on site Monday
Trenching work from OBS to VPW on Tuesday & Wednesday
Staging HAM ISI Storage container and Cleanroom in LVEA for 3IFO suspensions storage moves
HAM3 & BSC2 HEPI configuration work on Tuesday

When the modecleaner is kicked out of lock, the FSS oscillates and prevents relocking.

I've reduced the FSS common gain from 30 dB to 24 dB. Now the modecleaner relocks without issue.

I noticed that ALS-Y_REFL_B_DC does not seemed to be aligned. The error threshold has been lowered so that the flag does not go off and we can still lock. I am not sure when this misalignment happened or if this was intentional (I can't remember). Whoever goes down to EY first, can he/she align it?

(Elli, Daniel)

Went to EY to center the green beams on the WFSs. They were too far out for the PZT mirrors. Auto-centering enaged and working again.

Since the ETMX L1 L2P filters gave us a unstable x-arm lock once ALS-DIFF was engaged, we switched to a DC-only strategy:
 - Instead of the the L2P/L2Y filters we simply used flat gains, and tuned them at 0.1 Hz:
     Pitch: -60dB (FM10) * gain of  5.3
     Yaw:   -60dB (FM10) * gain of -0.7

 - We also tweaked the ESD L2P/L2Y's at 2Hz:
     Pitch: gain of 0.021
     Yaw:   gain of 0.007

 - This left some AC pitch fluctuations on ETMX. The OPLEV took care of that. We now have a stable ALS DIFF and COMM running in this configuration.