Betsy, Jason, Sheila, Fil, Marc, Travis, Adrian
This morning, a few of us made some walk-thrus of the Corner and End station VEAs to check and turn off items utilized during non-Observing run times, per T1500386 (bold were items which needed attention this time around). All of the following were checked off.
• Make sure no one is in the LVEA
• Cranes in their "parking spots" & their lights are OFF
• Monitors/work stations are turned OFF (except VAC computers) - Powered down ITMX camera setup computer
• Phones unplugged (wall-wars & RJ11 plugs) & batteries pulled from handsets (Phone locations here)
• Confirm no mechanical shorts onto HEPI.
• Cleanrooms OFF
• PSL in Science Mode - bit of an audible hum in the LVEA after everything turned off, kinda of seemed like it was more in the South bay, maybe fans or HVAC still need to be checke din this area
• ISC Table fans OFF
• Confirm wifi access points are unplugged (instructions)
• Electronics racks (i.e. make sure no test equipment connected to a rack, unless work permit for it.) - A few unconnected cables hanging in the PSL, ISC, SQZ racks, but all determined to be not an issue (some used for temp needs). Added termination plugs to unused RF plugs in SQZ racks, and 1 in the PSL rack. Lots of PEM BNC cables still run to various areas from PEM racks. O-scope connected and powered on near West bay corner for PEM coil use. Adrian/Robert confirm all PEM is in a nominal run configuration. Will spend another Tuesday with folks to finish cleaning up and stowing cables.
Temp dust mon at HAM2 unplugged.
End stations - HWS camera power supplies under IIET upgrade WIP, so temp plug-in to wall power.
EX weather station equipment (and PS) in rack on VEA floor removed by Fil.
HAM6 RGA ion pump controller sitting on a cart at the end of HAM6 chamber will be left on, but RGA/fan was turned off.
• Forklift NOT connected to charger
• Unplug unused power supplies/extension cords - Unplugged some
• Lights OFF (for end stations check lights via webcams)
• Unplug power supplies for Valcom Paging System and 48V DC H1PSL Phone in Communications Room 163. Also, here is a mouse in this room 163. The animal kind.
• ALOG the LVEA has been swept.
LVEA not as silent as we remember -
After all of the sweeping to unplug items, etc, the LVEA was not as quiet as many of us recall during O3. There is a quietish high pitched hum (like a fan) somewhere, but after Jason, TJ, and Gerardo and I listened for a bit, we couldn't specifically tell where it was coming from. It isn't a fan from an ISC table, nor is it the equipment in the PSL area emergency egress closet thing. Maaaybe it's the SQZ racks between HAM4 and 5, but you can also hear it when walking from there to the PSL. The SQZ racks are all new this time around however. Or, Gerardo suggests checking to see if it is the dust monitor pump in the mech room which is a bit loud. There is a temp power supply under the HAM4 HWS table but it has a slightly different quieter hum.
Richard also reminded us that the LVEA VAC rack along the Y-manifold area now has the back door removed and may be noisier than before. Will look into this next Tues.
We never got a picture of the gustmeter instrumentation when I set them up and they came up in the pre-O4 sweep. We are leaving the EY gustmeter setups in place, plugged in and taking data near the emergency door in the EY VEA. A picture of the current setup is attached. The gustmeter on ADC channel 12 has failed at some point.
The FCES was swept this morning before the run start. All well there with the above items looked at.
A noise source was identified in alog 69927, namely a loud dust mon pump.