Reports until 02:17, Friday 29 March 2013
H1 IOO
cheryl.vorvick@LIGO.ORG - posted 02:17, Friday 29 March 2013 - last comment - 16:47, Friday 29 March 2013(5923)
IO work wrapping up: 
- Joe, Giacomo, Cheryl

- Filiberto started the process to attach pins/connector to FI HWP pico motor.  Lack of information about the connector convinced us to push this out to at least tomorrow.

- the half wave plate was re-installed in the IMC trans beam path after IM1.  The beam through the FI was misaligned with IM2 to give an unclipped Forward Rejected Beam to minimize, which was minimized to around 40 uW of power.

- IOT2R was moved into place today, on the East side of HAM2, beams were aligned onto the single periscope and onto the table.  The table position needs to be marked before moving the table.

- beams transmitted through IM4 were measured - some measurements will be used to compare expected and actual transmittance of 2" fixed optics.  Actual power readings to be attached.

- AOE1 was aligned downstream of HWP per Rodica's instructions to move it along the beam path by 20mm.  With HA1 at 0, the front of the HWP is at 25mm , and the front plate of AOE1 is at 95mm along the beam path.

- PR2 scrapper baffle was installed.  Joe did the install, and centered the baffle w.r.t  the PR2 optic, since the beam at HAM3 iris was about a beam radius off in yaw, and off in pitch.  Earlier work of adding the HWP back into the beam path is the likely source of the change seen at PR2.  Using IM2, we deturmined that the correction was 100 slider counts or less, i.e. small.

Friday:
Plan is to flash the IMC, though there have been rumors of locking it in air...
Comments related to this report
filiberto.clara@LIGO.ORG - 11:14, Friday 29 March 2013 (5928)
Link 

Tried to connect/crimp the pins and connector for the Faraday Isolator. After going inside the chamber, noticed that the other connector that mates with the one I was installing is the same gender. We received a female connector and socket pins, but need male connector and pins. Have contacted Rich Abbot at CIT regarding getting correct parts.

Filiberto Clara
giacomo.ciani@LIGO.ORG - 16:47, Friday 29 March 2013 (5934)
Link

This are the power measurements we took on HAM to estimate the transmissivity of a number of optics. Measurement taken with filter inf ront of the sensr are specified (to account account for possible miscalibrations).

Incident on IM1 (filter on): 189 mW

Transmitted through IM1 (filter on): 6.25 mW

Transmitted through IM1 (filter on): 5.96 mW


NOTE: we did not realize that, because we were using the rerouted REFL beam, the polarization of the incident beam on IM1 was not as expected during operation. So this set of measruement is probably of (very) limited usefulness and will ned to be retaken. This does not apply to the following measurement taken at and after IM4, as only the right polarization remains in the main beam after the FI.

Forward incident on IM4 (filter on): 176 mW

Forward transmitted trough IM4 (filter on): .39 mW

Forward transmitted through IM4: 385 uW

Forward transmitted through ROM LH1: 30.5 uW

Forward reflected of ROM LH1: 361 uW

Forward incident on ROM RH3: 355 uW

Forward reflected of ROM RH4: 325 uW

Forward transmitted through ROM RH4: 25 uW

Forward reflected off IM4 (filter on): 175 mW

Forward transmitted through PRM (filter on): 5.4 mW

Backward transmitted through IM4: 380 uW

Based on the the above measurements, we can estimate the following transmissivities. Values in grey are calculated, not measured.

  Incident    Transmitted Reflected Sum
IM4 Forward 176 .39 0.22% 175 99.43% 175.39 99.65%
ROM LH1 .385 .0305 7.92% 0.361 93.77%  0.3915 101.69%
ROM RH4 .355 .025  7.04% 0.325 91.55% 0.35 98.59%
PRM 175 5.4 3.09% 169.6 96.91% 175 100.00%
IM4 Backwards 169.6 .038 0.22%