calum.torrie@LIGO.ORG - posted 14:35, Friday 03 June 2016 (27550)
Fiber experiment in optics lab
Travis Sadeki and Calum Torrie
Fiber experiment in optics lab to investigate effect (if any) of using the Top Gun Ionizing Air Gun System in proximity to the LIGO production fibers. For Top Gun information refer to https://dcc.ligo.org/LIGO-T1300687. Note the Temp was 71-73 deg F and the Humidity was ~ 38% on day 1 and day 2. The gas used is ultra high grade pure Nitrogen.
Experiment 1.1 (Day 1: June 2nd 2016 2:00pm).
Fiber #1 with Top Gun at 10 psi. Production Fiber with 15 kg x2 (overload test weight). Note this production fiber (#1) was hanging for 2 hours in test box prior to spraying with Top Gun. Also note that all of these experiments were conducted in a clean space, not in a dedicated clean room. For Fiber #1 we opened the door and sprayed across the opening (back and forth) for 30s 8" from fiber, at a position 1/2 way down the fiber. The door was then closed and we noted the fiber and mass got small kick from this action. Note this experiment is to mimic what a fiber could be exposed too during a 1st contact peel. However, it should be noted that this is a worse case scenario as in general the fiber guard is between the Top Gun and the fiber.
Experiment 1.2 (Day 1: June 2nd 2016 2:10pm).
Fiber #2 with Top Gun at 10 psi. Production Fiber with 15 kg x2 (overload test weight). Note this production fiber (#2) was hanging for 2 hours in test box prior to spraying with Top Gun. Also note that all of these experiments were conducted in a clean space, not in a dedicated clean room. for Fiber #2 we opened door for 30s. No spray was performed. Then we closed the door. Same kick seen on fiber as above. Note this is / was a control for experiment 1.1.
Experiment 1.1 (Day 2 am: June 2nd 2016 9:30am).
Fiber #1 still hanging. We then poked fiber in each box via peep hole - all good.
Now with Fiber #1 we repeated the experiment from the previous day again at 10 psi (2 time) and again for 30s as before.
Experiment 1.2 is now closed.
Now with Fiber #1 we repeated the experiment from the previous day again at 10 psi (2 time) and again for 30s as before.
Note - fiber was swinging back and forth during this experiment, as a result of previous poke. All good i.e. fiber still hanging at end.
Experiment 1.2 (Day 2 am: June 2nd 2016 9:40am).
Fiber #2 still hanging. We then poked fiber in each box via peep hole - all good.Experiment 1.2 is now closed.
Experiment 2.1 (Day 2 am: June 2nd 2016 9:45am).
Now with Fiber #2 we increased the regulator to 20 psi test. Else same as above. All good i.e. fiber still hanging at end. Note this experiment is to mimic what a fiber could be exposed too during a gap charge removal at an ETM, refer to https://dcc.ligo.org/LIGO-T1500101. However, it should be noted that this is a worse case scenario as in general the fiber guard is between the Top Gun and the fiber.
Experiment 1.1 (Day 2 pm: June 2nd 2016 1:30pm).
Back to Fiber #1 and again at 10 psi (3rd time). We noted that there is a small swing induced on the fiber / mass by the Top Gun. All good.
Experiment 2.1 (Day 2 pm: June 2nd 2016 1:35pm).
Then again back to Fiber #2. 20 psi 30s again at 8" (2nd time). All good.
Conclusion
So far so good and no effect seen on suspended fibers as a result of exposing fibers to ionized air from Top Gun at both 10 psi and 20 psi. Travis and Calum.
So far so good and no effect seen on suspended fibers as a result of exposing fibers to ionized air from Top Gun at both 10 psi and 20 psi. Travis and Calum.
Images attached to this report
